JP2014235941A - Flat battery - Google Patents

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Publication number
JP2014235941A
JP2014235941A JP2013118093A JP2013118093A JP2014235941A JP 2014235941 A JP2014235941 A JP 2014235941A JP 2013118093 A JP2013118093 A JP 2013118093A JP 2013118093 A JP2013118093 A JP 2013118093A JP 2014235941 A JP2014235941 A JP 2014235941A
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positive electrode
electrode material
flat battery
wall portion
negative electrode
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JP6151974B2 (en
Inventor
昇志 薮下
Shoji Yabushita
昇志 薮下
津田 健司
Kenji Tsuda
健司 津田
山野 淳
Atsushi Yamano
淳 山野
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Maxell Holdings Ltd
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Hitachi Maxell Ltd
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Priority to JP2013118093A priority Critical patent/JP6151974B2/en
Priority to US14/407,277 priority patent/US9653711B2/en
Priority to PCT/JP2013/066356 priority patent/WO2013187479A1/en
Priority to EP13803615.7A priority patent/EP2863459B1/en
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Abstract

PROBLEM TO BE SOLVED: To provide a flat battery including a positive electrode material and a negative electrode material, in which at least one member of the positive electrode material and the negative electrode material can be effectively reinforced so that the at least one member is not damaged by vibrations or the like.SOLUTION: A flat battery (1) includes: a bottomed cylindrical positive electrode can (10); a bottomed cylindrical negative electrode can (20) covering an opening of the positive electrode can (10); a positive electrode material (41) and a negative electrode material (42) disposed in a space formed between the positive electrode can (10) and the negative electrode can (20); a positive electrode ring (44) holding the positive electrode material (41); and a mesh member (51) disposed at a portion where is not covered with the positive electrode ring (44) in the positive electrode material (41) and reinforcing the portion.

Description

本発明は、コイン形電池等の扁平形電池に関する。   The present invention relates to a flat battery such as a coin battery.

従来より、有底筒状の外装缶と該外装缶の開口を覆うように配置される封口缶との間に、正極材及び負極材を配置した扁平形電池が知られている。このような扁平形電池として、例えば特許文献1に開示されるように、円柱状の正極ペレットの側面を正極リングによって保持する構成が知られている。   Conventionally, a flat battery in which a positive electrode material and a negative electrode material are disposed between a bottomed cylindrical outer can and a sealing can disposed so as to cover the opening of the outer can is known. As such a flat battery, as disclosed in Patent Document 1, for example, a configuration in which a side surface of a cylindrical positive electrode pellet is held by a positive electrode ring is known.

なお、特許文献1の構成では、正極リングは、抵抗溶接もしくはレーザー溶接によって、正極缶の内側に溶着されている。   In the configuration of Patent Document 1, the positive electrode ring is welded to the inside of the positive electrode can by resistance welding or laser welding.

特開2008−103109号公報JP 2008-103109 A

上述の特許文献1の構成のように、正極材(正極ペレット)の側面を台座(正極リング)によって保持する構成の場合、正極材のうち台座によって覆われている部分は、該台座によって部分的に補強されている。しかしながら、正極材のうち台座によって覆われていない部分は露出しているため、当該部分の強度はあまり高くない。そのため、特許文献1の構成の扁平形電池を、大きな振動が加わる装置の電源として用いた場合には、装置に加わる振動によって正極材の一部が損傷を受ける可能性がある。   In the case of the configuration in which the side surface of the positive electrode material (positive electrode pellet) is held by the pedestal (positive electrode ring) as in the configuration of Patent Document 1 described above, the portion of the positive electrode material that is covered by the pedestal is partially formed by the pedestal. It is reinforced. However, since the portion of the positive electrode material that is not covered by the pedestal is exposed, the strength of the portion is not so high. Therefore, when the flat battery having the configuration of Patent Document 1 is used as a power source for a device to which a large vibration is applied, a part of the positive electrode material may be damaged by the vibration applied to the device.

本発明の目的は、正極材及び負極材を備えた扁平形電池において、正極材及び負極材のうち少なくとも一方の部材が振動等によって損傷を受けないように、前記少なくとも一方の部材を効果的に補強可能な構成を得ることにある。   An object of the present invention is to provide a flat battery including a positive electrode material and a negative electrode material, and to at least one member effectively so that at least one member of the positive electrode material and the negative electrode material is not damaged by vibration or the like. The object is to obtain a reinforced structure.

本発明の一実施形態に係る扁平形電池は、有底筒状の外装缶と、前記外装缶の開口を覆う有底筒状の封口缶と、前記外装缶と前記封口缶との間に形成される空間内に配置された正極材及び負極材と、前記正極材及び前記負極材のうち少なくとも一方の部材を保持する台座と、前記少なくとも一方の部材のうち前記台座によって覆われていない部分に配置され、当該部分を補強する補強部材とを備える(第1の構成)。   A flat battery according to an embodiment of the present invention is formed between a bottomed cylindrical outer can, a bottomed cylindrical sealing can that covers an opening of the outer can, and the outer can and the sealed can. A positive electrode material and a negative electrode material arranged in the space, a pedestal holding at least one member of the positive electrode material and the negative electrode material, and a portion of the at least one member not covered by the pedestal And a reinforcing member that reinforces the portion (first configuration).

以上の構成により、正極材及び負極材のうち少なくとも一方の部材を、台座及び補強部材によって補強することができる。すなわち、前記少なくとも一方の部材は、台座によって覆われてない部分が補強部材によって補強されるため、台座のみによって補強される従来の構成に比べて、前記少なくとも一方の部材をより確実に補強することができる。   With the above configuration, at least one member of the positive electrode material and the negative electrode material can be reinforced by the base and the reinforcing member. In other words, since at least one member is reinforced by the reinforcing member at a portion that is not covered by the pedestal, the at least one member can be reinforced more reliably than the conventional configuration in which the reinforced member is reinforced only by the pedestal. Can do.

したがって、大きな振動等が加わる装置の電源として扁平形電池を用いた場合でも、正極材及び負極材のうち少なくとも一方の部材が大きな損傷を受けるのを防止できる。よって、従来に比べて扁平形電池の耐振動性及び耐衝撃性を向上することができる。   Therefore, even when a flat battery is used as a power source of a device to which a large vibration or the like is applied, at least one member of the positive electrode material and the negative electrode material can be prevented from being damaged greatly. Therefore, the vibration resistance and impact resistance of the flat battery can be improved as compared with the conventional case.

前記第1の構成において、前記一方の部材は、軸線方向に延びる柱状に形成されている。前記台座は、前記一方の部材の側面を覆うように配置されている。前記補強部材は、前記一方の部材における前記軸線方向の端面に配置されている(第2の構成)。   In the first configuration, the one member is formed in a column shape extending in the axial direction. The said base is arrange | positioned so that the side surface of said one member may be covered. The reinforcing member is disposed on an end surface in the axial direction of the one member (second configuration).

これにより、柱状の一方の部材における側面及び端面をそれぞれ補強することができる。したがって、一方の部材の強度をより確実に向上することができる。   Thereby, the side surface and end surface in one columnar member can each be reinforced. Therefore, the strength of one member can be improved more reliably.

前記第2の構成において、前記補強部材は、前記軸線方向と交差する方向に拡がるように、前記一方の部材内に配置されている(第3の構成)。これにより、一方の部材の軸線方向の強度をより確実に向上することができる。   In the second configuration, the reinforcing member is disposed in the one member so as to expand in a direction intersecting the axial direction (third configuration). Thereby, the intensity | strength of the axial direction of one member can be improved more reliably.

前記第2または第3の構成において、前記一方の部材は、前記外装缶上に前記端面が位置するように配置されている(第4の構成)。このように、一方の部材における軸線方向の両端面のうち補強部材が配置された一方の端面を、外装缶上に配置することで、一方の部材と外装缶とをより確実に接触させることができる。すなわち、一方の部材において外装缶上に位置する一方の端面に補強部材を設けることにより、該端面の剛性を向上できるとともに該端面の形状をより確実に保持できる。したがって、一方の部材における前記一方の端面と外装缶とをより確実に電気的に接触させることができる。   In the second or third configuration, the one member is arranged such that the end face is positioned on the outer can (fourth configuration). Thus, by arranging one end face where the reinforcing member is disposed on the outer can among the both end faces in the axial direction of the one member, the one member and the outer can can be more reliably brought into contact with each other. it can. That is, by providing a reinforcing member on one end face located on the outer can in one member, the rigidity of the end face can be improved and the shape of the end face can be more reliably maintained. Therefore, the one end surface of the one member and the outer can can be more reliably brought into electrical contact.

前記第1から第4の構成のうちいずれか一つの構成において、前記外装缶は、底部と、前記軸線方向に延びる筒状側壁部とを有する。前記封口缶は、前記外装缶の開口を覆った状態で前記外装缶の内方に位置付けられる周壁部を有する。前記台座は、前記一方の部材を保持する保持部と、前記軸線方向から見て前記封口缶の周壁部の開口端と重なるように前記保持部から外方に延びるフランジ部とを有する。前記フランジ部は、前記封口缶の周壁部の開口端と前記外装缶の底部の内面との間に挟み込まれている(第5の構成)。   In any one of the first to fourth configurations, the outer can has a bottom portion and a cylindrical side wall portion extending in the axial direction. The said sealing can has the surrounding wall part located inside the said exterior can in the state which covered the opening of the said exterior can. The pedestal includes a holding portion that holds the one member, and a flange portion that extends outward from the holding portion so as to overlap the opening end of the peripheral wall portion of the sealing can as viewed from the axial direction. The flange portion is sandwiched between the open end of the peripheral wall portion of the sealing can and the inner surface of the bottom portion of the outer can (fifth configuration).

以上の構成により、台座によって保持された一方の部材は、台座のフランジ部によって外装缶及び封口缶に対して固定される。したがって、一方の部材が外装缶及び封口缶に対して移動するのを抑制することができる。よって、大きな振動を受ける装置に電源として扁平形電池を用いた場合に、該扁平形電池内の部材が大きな損傷を受けるのをより確実に防止できる。   With the above configuration, one member held by the pedestal is fixed to the outer can and the sealed can by the flange portion of the pedestal. Therefore, it can suppress that one member moves with respect to an exterior can and a sealing can. Therefore, when a flat battery is used as a power source for a device that receives large vibrations, it is possible to more reliably prevent members in the flat battery from being damaged greatly.

前記第5の構成において、前記フランジ部は、前記軸線方向から見て、外周端が前記封口缶の周壁部の開口端よりも外方に位置するような大きさに形成されている(第6の構成)。   In the fifth configuration, the flange portion is formed in such a size that the outer peripheral end is located outward from the opening end of the peripheral wall portion of the sealing can as viewed from the axial direction (sixth). Configuration).

こうすることで、台座のフランジ部を、封口缶及び外装缶に対してより確実に固定できる。すなわち、台座のフランジ部は、軸線方向から見て、外周端が封口缶の周壁部の開口端よりも外方に位置しているため、封口缶の周壁部の開口端と外装缶の底部の内面との間により強固に挟み込まれる。   By carrying out like this, the flange part of a base can be more reliably fixed with respect to a sealing can and an exterior can. That is, the flange portion of the pedestal has an outer peripheral end located outside the opening end of the peripheral wall portion of the sealing can as viewed from the axial direction, so that the opening end of the peripheral wall portion of the sealing can and the bottom portion of the outer can It is more firmly sandwiched between the inner surface.

前記第5または第6の構成において、前記封口缶の周壁部の開口端と前記外装缶の底部の内面との間には、シール部材が配置されている。前記フランジ部は、前記シール部材と前記外装缶の底部の内面との間に挟み込まれる(第7の構成)。   In the fifth or sixth configuration, a seal member is disposed between the open end of the peripheral wall portion of the sealing can and the inner surface of the bottom portion of the outer can. The flange portion is sandwiched between the seal member and the inner surface of the bottom portion of the outer can (seventh configuration).

このような構成において、封口缶の周壁部に対して外装缶の周壁部の開口端部をかしめることにより、封口缶と外装缶との間をシール部材によってシールしつつ、台座のフランジ部を封口缶の周壁部の開口端と外装缶の底部の内面との間に挟み込むことができる。したがって、容易に製造可能な構成によって、シール部材によるシール性能を確保しつつ、台座を封口缶及び外装缶に対して固定することができる。   In such a configuration, the flange portion of the pedestal is sealed with a sealing member between the sealing can and the outer can by caulking the open end of the peripheral wall portion of the outer can with respect to the peripheral wall portion of the sealing can. It can be sandwiched between the opening end of the peripheral wall portion of the sealing can and the inner surface of the bottom portion of the outer can. Therefore, the pedestal can be fixed to the sealing can and the outer can while securing the sealing performance by the sealing member with a structure that can be easily manufactured.

前記第1から第7の構成のうちいずれか一つの構成において、前記補強部材は、網状の部材である(第8の構成)。これにより、例えば粉末状の材料を固めて一方の部材を形成する場合に、網状の補強部材の目の中に粉末状の材料が入り込む。したがって、補強部材と一方の部材とをより強固に一体化させることができる。   In any one of the first to seventh configurations, the reinforcing member is a net-like member (eighth configuration). Thereby, for example, when a powdery material is hardened to form one member, the powdery material enters the eyes of the mesh-like reinforcing member. Therefore, the reinforcing member and one member can be integrated more firmly.

本発明の一実施形態に係る扁平形電池では、正極材及び負極材のうち少なくとも一方の部材を保持する台座、及び、前記少なくとも一方の部材において台座によって覆われていない部分に配置される補強部材を備える。これにより、少なくとも一方の部材の強度を向上することができ、従来に比べて耐振動性及び耐衝撃性の高い扁平形電池が得られる。   In a flat battery according to an embodiment of the present invention, a pedestal that holds at least one member of a positive electrode material and a negative electrode material, and a reinforcing member that is disposed on a portion of the at least one member that is not covered by the pedestal Is provided. Thereby, the strength of at least one member can be improved, and a flat battery having higher vibration resistance and impact resistance than the conventional one can be obtained.

図1は、実施形態に係る扁平形電池の概略構成を示す断面図である。FIG. 1 is a cross-sectional view illustrating a schematic configuration of a flat battery according to an embodiment. 図2は、正極リングと負極缶の周壁部の開口端との位置関係を示す正極リングの上面図である。FIG. 2 is a top view of the positive electrode ring showing the positional relationship between the positive electrode ring and the open end of the peripheral wall portion of the negative electrode can. 図3は、正極缶内で正極リングの位置がずれた場合の図2相当図である。FIG. 3 is a view corresponding to FIG. 2 when the position of the positive electrode ring is shifted in the positive electrode can. 図4は、正極材及び正極リングからなる成形体の密度と破壊荷重との関係を示すグラフである。FIG. 4 is a graph showing the relationship between the density of a molded body made of a positive electrode material and a positive electrode ring and the breaking load.

以下、図面を参照し、本発明の実施の形態を詳しく説明する。図中の同一または相当部分については同一の符号を付してその説明は繰り返さない。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals and description thereof will not be repeated.

(全体構成)
図1は、本発明の一実施形態である扁平形電池1の概略構成を示す断面図である。この扁平形電池1は、有底円筒状の正極缶10(外装缶)と、該正極缶10の開口を覆う負極缶20(封口缶)と、正極缶10の外周側と負極缶20の外周側との間に配置されるガスケット30と、正極缶10及び負極缶20の間に形成される空間内に収納される発電要素40とを備える。扁平形電池1は、正極缶10と負極缶20とを組み合わせることによって、全体が扁平なコイン状に形成される。なお、正極缶10及び負極缶20の間に形成される空間内には、発電要素40以外に、非水電解液(図示省略)も封入されている。
(overall structure)
FIG. 1 is a cross-sectional view showing a schematic configuration of a flat battery 1 according to an embodiment of the present invention. The flat battery 1 includes a bottomed cylindrical positive electrode can 10 (exterior can), a negative electrode can 20 (sealing can) covering the opening of the positive electrode can 10, an outer peripheral side of the positive electrode can 10, and an outer periphery of the negative electrode can 20. And a power generation element 40 accommodated in a space formed between the positive electrode can 10 and the negative electrode can 20. The flat battery 1 is formed into a flat coin shape as a whole by combining the positive electrode can 10 and the negative electrode can 20. In addition to the power generation element 40, a non-aqueous electrolyte (not shown) is also enclosed in the space formed between the positive electrode can 10 and the negative electrode can 20.

正極缶10は、ステンレスなどの金属材料からなり、プレス成形によって有底円筒状に形成されている。正極缶10は、円形状の底部11と、その外周に該底部11と連続して形成される円筒状の周壁部12(筒状側壁部)とを備える。周壁部12は、縦断面視で、底部11に対して垂直に延びるように設けられている。正極缶10は、後述するように、負極缶20との間にガスケット30を挟んだ状態で、周壁部12の開口端側が内側に折り曲げられて、該負極缶20の外周部に対してかしめられている。図1における符号Pは、扁平形電池1の軸線である。周壁部12は、扁平形電池1の軸線方向に延びている。   The positive electrode can 10 is made of a metal material such as stainless steel, and is formed into a bottomed cylindrical shape by press molding. The positive electrode can 10 includes a circular bottom portion 11 and a cylindrical peripheral wall portion 12 (cylindrical side wall portion) formed continuously with the bottom portion 11 on the outer periphery thereof. The peripheral wall portion 12 is provided so as to extend perpendicularly to the bottom portion 11 in a longitudinal sectional view. As described later, the positive electrode can 10 is crimped to the outer peripheral portion of the negative electrode can 20 by bending the opening end side of the peripheral wall portion 12 inward with the gasket 30 sandwiched between the positive electrode can 10 and the negative electrode can 20. ing. A symbol P in FIG. 1 is an axis of the flat battery 1. The peripheral wall portion 12 extends in the axial direction of the flat battery 1.

正極缶10の底部11は、その内面が平坦になるように平板状に形成されている。すなわち、本実施形態の正極缶10は、外周側に段差が形成されていない、平坦な底部11を有する。   The bottom 11 of the positive electrode can 10 is formed in a flat plate shape so that its inner surface is flat. That is, the positive electrode can 10 of the present embodiment has a flat bottom portion 11 on which no step is formed on the outer peripheral side.

負極缶20も、正極缶10と同様、ステンレスなどの金属材料からなり、プレス成形によって有底円筒状に形成されている。負極缶20は、円形状の平面部21と、その外周に該平面部21と連続して形成される円筒状の周壁部22とを備える。この周壁部22も、正極缶10と同様、縦断面視で、平面部21に対して垂直に延びるように設けられている。すなわち、周壁部22も、扁平形電池1の軸線方向に延びている。   Similarly to the positive electrode can 10, the negative electrode can 20 is made of a metal material such as stainless steel and is formed in a bottomed cylindrical shape by press molding. The negative electrode can 20 includes a circular plane portion 21 and a cylindrical peripheral wall portion 22 formed continuously with the plane portion 21 on the outer periphery thereof. Similar to the positive electrode can 10, the peripheral wall portion 22 is also provided so as to extend perpendicularly to the flat portion 21 in a longitudinal sectional view. That is, the peripheral wall portion 22 also extends in the axial direction of the flat battery 1.

周壁部22は、該周壁部22の基端部22aに対して径が段状に大きくなる拡径部22bを有する。すなわち、周壁部22には、基端部22aと拡径部22bとの間に段部22cが形成されている。図1に示すように、この段部22cに対して、正極缶10の周壁部12の開口端側が折り曲げられてかしめられている。これにより、正極缶10と負極缶20とが、それらの外周側で接続されている。   The peripheral wall portion 22 has a diameter-enlarged portion 22 b whose diameter is increased stepwise with respect to the base end portion 22 a of the peripheral wall portion 22. That is, the peripheral wall portion 22 is formed with a step portion 22c between the base end portion 22a and the enlarged diameter portion 22b. As shown in FIG. 1, the open end side of the peripheral wall portion 12 of the positive electrode can 10 is bent and caulked with respect to the step portion 22c. Thereby, the positive electrode can 10 and the negative electrode can 20 are connected on the outer peripheral side thereof.

ガスケット30(シール部材)は、ポリフェニレンサルファイド(PPS)を主成分としており、PPSにオレフィン系エラストマーを含有した樹脂組成物からなる。ガスケット30は、正極缶10の周壁部12と負極缶20の周壁部22との間に挟みこまれるように配置されている。また、ガスケット30は、負極缶20の周壁部22の開口端と正極缶10の底部11との間に挟み込まれるように配置されている。具体的には、ガスケット30は、リング状のベース部31と、該ベース部31の外周縁から突出する外筒壁32と、該ベース部31の内周縁から該外筒壁32と同じ方向に伸びる内筒壁33とを備える。本実施形態では、ガスケット30は、ベース部31、外筒壁32及び内筒壁33が一体で形成されている。   The gasket 30 (seal member) is mainly composed of polyphenylene sulfide (PPS) and is made of a resin composition containing an olefin elastomer in PPS. The gasket 30 is disposed so as to be sandwiched between the peripheral wall portion 12 of the positive electrode can 10 and the peripheral wall portion 22 of the negative electrode can 20. Further, the gasket 30 is disposed so as to be sandwiched between the open end of the peripheral wall portion 22 of the negative electrode can 20 and the bottom portion 11 of the positive electrode can 10. Specifically, the gasket 30 includes a ring-shaped base portion 31, an outer cylindrical wall 32 protruding from the outer peripheral edge of the base portion 31, and the outer peripheral wall 32 from the inner peripheral edge of the base portion 31 in the same direction. And an extending inner cylinder wall 33. In the present embodiment, the gasket 30 is formed integrally with a base portion 31, an outer cylindrical wall 32, and an inner cylindrical wall 33.

ガスケット30は、図1に示すように、ベース部31が、後述する正極リング44のフランジ部44b上に位置するように配置されている。そして、ガスケット30のベース部31及び正極リング44のフランジ部44bは、負極缶20の周壁部22の開口端と正極缶10の底部11の外周部分との間に挟みこまれている。   As shown in FIG. 1, the gasket 30 is disposed so that the base portion 31 is positioned on a flange portion 44 b of a positive electrode ring 44 described later. The base portion 31 of the gasket 30 and the flange portion 44 b of the positive electrode ring 44 are sandwiched between the open end of the peripheral wall portion 22 of the negative electrode can 20 and the outer peripheral portion of the bottom portion 11 of the positive electrode can 10.

また、ガスケット30は、負極缶20の拡径部22bを覆うように配置されている。すなわち、ガスケット30は、負極缶20の拡径部22bが、ガスケット30の外筒壁32と内筒壁33との間に位置づけられるように、負極缶20の拡径部22bに配置されている。これにより、ガスケット30の外筒壁32は、正極缶10の周壁部12と負極缶20の周壁部22との間に挟みこまれる。ガスケット30のベース部31及び外筒壁32は、正極缶10と負極缶20との間に挟みこまれた状態で、該正極缶10と負極缶20との隙間をシール可能な厚みを有する。   Further, the gasket 30 is disposed so as to cover the enlarged diameter portion 22 b of the negative electrode can 20. That is, the gasket 30 is disposed in the enlarged diameter portion 22b of the negative electrode can 20 so that the enlarged diameter portion 22b of the negative electrode can 20 is positioned between the outer cylindrical wall 32 and the inner cylindrical wall 33 of the gasket 30. . Thereby, the outer cylindrical wall 32 of the gasket 30 is sandwiched between the peripheral wall portion 12 of the positive electrode can 10 and the peripheral wall portion 22 of the negative electrode can 20. The base portion 31 and the outer cylindrical wall 32 of the gasket 30 have a thickness capable of sealing the gap between the positive electrode can 10 and the negative electrode can 20 while being sandwiched between the positive electrode can 10 and the negative electrode can 20.

このように、正極缶10の周壁部12と負極缶20の周壁部22との間にガスケット30を配置することにより、該正極缶10と負極缶20とをそれらの外周側で絶縁することができる。また、正極缶10の周壁部12と負極缶20の周壁部22との間にガスケット30を挟みこんだ状態で、該正極缶10の周壁部12を折り曲げて負極缶20の周壁部22にかしめることにより、該ガスケット30によって正極缶10の周壁部12と負極缶20の周壁部22との間を封止することができる。すなわち、ガスケット30は、正極缶10の周壁部12と負極缶20の段部22cとの間に挟みこまれる外筒壁32、及び、負極缶20の周壁部22の開口端と正極缶10の底部11との間に挟みこまれるベース部31が、それぞれ、シールとして機能する。   Thus, by arranging the gasket 30 between the peripheral wall portion 12 of the positive electrode can 10 and the peripheral wall portion 22 of the negative electrode can 20, the positive electrode can 10 and the negative electrode can 20 can be insulated on the outer peripheral side thereof. it can. In addition, with the gasket 30 sandwiched between the peripheral wall portion 12 of the positive electrode can 10 and the peripheral wall portion 22 of the negative electrode can 20, the peripheral wall portion 12 of the positive electrode can 10 is folded and connected to the peripheral wall portion 22 of the negative electrode can 20. By tightening, the gasket 30 can seal between the peripheral wall portion 12 of the positive electrode can 10 and the peripheral wall portion 22 of the negative electrode can 20. That is, the gasket 30 includes the outer cylindrical wall 32 sandwiched between the peripheral wall portion 12 of the positive electrode can 10 and the step portion 22 c of the negative electrode can 20, and the opening end of the peripheral wall portion 22 of the negative electrode can 20 and the positive electrode can 10. The base portions 31 sandwiched between the bottom portion 11 each function as a seal.

また、ガスケット30のベース部31と正極缶10の底部11との間に、後述する正極リング44のフランジ部44bを配置することで、該フランジ部44bをガスケット30のベース部31と正極缶10の底部11とによって挟み込むことができる。これにより、正極リング44のフランジ部44bを、正極缶10の底部11に溶接することなく、該正極缶10に対して固定することができる。   Further, a flange portion 44b of the positive electrode ring 44 described later is disposed between the base portion 31 of the gasket 30 and the bottom portion 11 of the positive electrode can 10, so that the flange portion 44b is connected to the base portion 31 of the gasket 30 and the positive electrode can 10. Between the bottom portion 11 and the bottom portion 11. Thereby, the flange portion 44 b of the positive electrode ring 44 can be fixed to the positive electrode can 10 without welding to the bottom portion 11 of the positive electrode can 10.

正極リング44は、所定の剛性及び導電性を有するステンレス鋼等によって構成されている。図1及び図2に示すように、正極リング44は、正極材41の側面に接する円筒状の側壁部44a(保持部)と、該側壁部44aの一端側から外方に向かって延びる円環状のフランジ部44bとを有する。本実施形態では、側壁部44a及びフランジ部44bは一体形成されている。すなわち、正極リング44は、概略ハット状に形成されている。   The positive ring 44 is made of stainless steel or the like having predetermined rigidity and conductivity. As shown in FIGS. 1 and 2, the positive electrode ring 44 includes a cylindrical side wall portion 44a (holding portion) in contact with the side surface of the positive electrode material 41, and an annular shape extending outward from one end side of the side wall portion 44a. Flange portion 44b. In the present embodiment, the side wall portion 44a and the flange portion 44b are integrally formed. That is, the positive electrode ring 44 is formed in a substantially hat shape.

側壁部44aは、円柱状の正極材41を内部で保持可能なように、正極材41の外径と同等かそれよりも小さい内径を有する。すなわち、円柱状の正極材41は、側壁部44aの内面によって保持される。   The side wall portion 44a has an inner diameter that is equal to or smaller than the outer diameter of the positive electrode material 41 so that the cylindrical positive electrode material 41 can be held inside. That is, the columnar positive electrode material 41 is held by the inner surface of the side wall portion 44a.

フランジ部44bは、円筒状の側壁部44aの一方の端部から該側壁部44aの全周に亘って外方に延びている。すなわち、図2に示すように、フランジ部44bは、円環状に形成されている。図1及び図2に示すように、フランジ部44bは、扁平形電池1の軸線方向から見て、外周端が負極缶20の拡径部22bの開口端(周壁部22の開口端)よりも外方に位置するような大きさを有する。本実施形態の場合、フランジ部44bは、正極缶10の底部11の内面と同等の外径、もしくは、負極缶20の拡径部22bの開口端の外径と正極缶10の底部11における内面の直径との間の外径を有する。   The flange portion 44b extends outward from one end of the cylindrical side wall portion 44a over the entire circumference of the side wall portion 44a. That is, as shown in FIG. 2, the flange portion 44b is formed in an annular shape. As shown in FIGS. 1 and 2, the flange portion 44 b has an outer peripheral end that is more than the opening end of the enlarged diameter portion 22 b of the negative electrode can 20 (the opening end of the peripheral wall portion 22) when viewed from the axial direction of the flat battery 1. It has a size that is located outside. In the case of the present embodiment, the flange portion 44 b has an outer diameter equivalent to the inner surface of the bottom portion 11 of the positive electrode can 10, or the outer diameter of the open end of the enlarged diameter portion 22 b of the negative electrode can 20 and the inner surface of the bottom portion 11 of the positive electrode can 10. Having an outer diameter between

このように、正極リング44のフランジ部44bを、扁平形電池1の軸線方向から見て、外周端が負極缶20の拡径部22bの開口端よりも外方に位置するような大きさにすることで、フランジ部44bを負極缶20の周壁部22と正極缶10の底部11との間に挟み込むことができる。これにより、正極缶10及び負極缶20に対する正極リング44の移動を抑制することができる。また、フランジ部44bは、扁平形電池1の軸線方向から見て、外周端が正極缶10の底部11の内面の最外周よりも内側に位置する。これにより、フランジ部44bと底部11との接触以外にも、ガスケット30と正極缶10の底部11との接触を確保することができる。よって、封止性能が損なわれるのを防止できる。   In this way, the flange portion 44b of the positive electrode ring 44 is sized so that the outer peripheral end is located outward from the open end of the enlarged diameter portion 22b of the negative electrode can 20 when viewed from the axial direction of the flat battery 1. By doing so, the flange portion 44 b can be sandwiched between the peripheral wall portion 22 of the negative electrode can 20 and the bottom portion 11 of the positive electrode can 10. Thereby, the movement of the positive electrode ring 44 with respect to the positive electrode can 10 and the negative electrode can 20 can be suppressed. Further, the flange portion 44 b has an outer peripheral end located on the inner side of the outermost periphery of the inner surface of the bottom portion 11 of the positive electrode can 10 when viewed from the axial direction of the flat battery 1. Thereby, in addition to the contact between the flange portion 44 b and the bottom portion 11, the contact between the gasket 30 and the bottom portion 11 of the positive electrode can 10 can be ensured. Therefore, it can prevent that sealing performance is impaired.

フランジ部44bは、図3に示すように、正極缶10の軸線方向から見て、外周端の一部が正極缶10の底部11の内面の最外周に位置している場合(周壁部12と接している場合)に、側壁部44aを挟んで反対側の部分が負極缶20の拡径部22bの開口端と重なるような大きさであるのがより好ましい。これにより、正極缶10の底部11上で正極リング44の位置がずれた場合でも、該正極リング44のフランジ部44bを負極缶20の拡径部22bの開口端と正極缶10の底部11の内面との間に挟み込むことができる。したがって、正極リング44を正極缶10及び負極缶20に対してより確実に固定することができる。   As shown in FIG. 3, when the flange portion 44 b is located at the outermost periphery of the inner surface of the bottom portion 11 of the positive electrode can 10 when viewed from the axial direction of the positive electrode can 10 (with the peripheral wall portion 12 and It is more preferable that the portion on the opposite side across the side wall portion 44a overlaps with the opening end of the enlarged diameter portion 22b of the negative electrode can 20 in the case of contact. Thereby, even when the position of the positive electrode ring 44 is shifted on the bottom portion 11 of the positive electrode can 10, the flange portion 44 b of the positive electrode ring 44 is connected to the opening end of the enlarged diameter portion 22 b of the negative electrode can 20 and the bottom portion 11 of the positive electrode can 10. Can be sandwiched between the inner surface. Therefore, the positive electrode ring 44 can be more reliably fixed to the positive electrode can 10 and the negative electrode can 20.

本実施形態の場合、図1に示すように、正極リング44のフランジ部44bは、ガスケット30のベース部31と正極缶10の底部11との間に配置されている。すなわち、フランジ部44bは、ガスケット30を介して、負極缶20の周壁部22の開口端と正極缶10の底部11の内面との間に挟み込まれている。   In the present embodiment, as shown in FIG. 1, the flange portion 44 b of the positive electrode ring 44 is disposed between the base portion 31 of the gasket 30 and the bottom portion 11 of the positive electrode can 10. That is, the flange portion 44 b is sandwiched between the opening end of the peripheral wall portion 22 of the negative electrode can 20 and the inner surface of the bottom portion 11 of the positive electrode can 10 via the gasket 30.

発電要素40は、正極活物質等を略円柱状に成形した正極材41と、負極活物質の金属リチウムまたはリチウム合金を円盤状に形成した負極材42と、不織布製のセパレータ43とを備えている。   The power generation element 40 includes a positive electrode material 41 in which a positive electrode active material or the like is formed in a substantially cylindrical shape, a negative electrode material 42 in which a metal lithium or a lithium alloy of a negative electrode active material is formed in a disk shape, and a nonwoven fabric separator 43. Yes.

図1に示すように、正極材41及び負極材42は、扁平形電池1の軸線方向に積層されるように配置されている。すなわち、正極材41及び負極材42は、それらの厚み方向に積層されている。また、正極材41は、正極缶10の内方に位置付けられている一方、負極材42は、負極缶20の内方に位置付けられている。正極材41と負極材42との間にはセパレータ43が配置されている。   As shown in FIG. 1, the positive electrode material 41 and the negative electrode material 42 are arranged so as to be stacked in the axial direction of the flat battery 1. That is, the positive electrode material 41 and the negative electrode material 42 are laminated in the thickness direction thereof. The positive electrode material 41 is positioned inside the positive electrode can 10, while the negative electrode material 42 is positioned inside the negative electrode can 20. A separator 43 is disposed between the positive electrode material 41 and the negative electrode material 42.

正極材41は、正極活物質として二酸化マンガンを含有している。正極材41は、正極リング44によって保持されている。すなわち、略円柱状の正極材41の側面は、正極リング44によって覆われている。   The positive electrode material 41 contains manganese dioxide as a positive electrode active material. The positive electrode material 41 is held by a positive electrode ring 44. That is, the side surface of the substantially cylindrical positive electrode material 41 is covered with the positive electrode ring 44.

正極材41は、後述するように、粉末状の正極合剤を加圧成形した後、焼成することにより得られる。すなわち、略円柱状の正極材41は、次のように形成される。   As will be described later, the positive electrode material 41 is obtained by pressure-molding a powdered positive electrode mixture and then firing it. That is, the substantially cylindrical positive electrode material 41 is formed as follows.

まず、二酸化マンガンに、黒鉛、テトラフルオロエチレン−ヘキサフルオロプロピレン共重合体及びヒドロキシプロピルセルロースを混合して正極合剤を調整する。   First, graphite, tetrafluoroethylene-hexafluoropropylene copolymer and hydroxypropylcellulose are mixed with manganese dioxide to prepare a positive electrode mixture.

前記正極合剤からなる粉末を正極リング44内に充填した状態で加圧成形した後、成形された部材を加熱することにより、正極材41が正極リング44内に円柱状に形成される。なお、上述の限りではなく、正極リング44内に正極材41をペレット状に成形可能な方法であれば、どのような方法でもよい。   The positive electrode material 41 is formed in a columnar shape in the positive electrode ring 44 by press-molding the powder made of the positive electrode mixture in a state where the positive electrode ring 44 is filled and then heating the molded member. The method is not limited to the above, and any method may be used as long as the positive electrode material 41 can be formed into a pellet shape in the positive electrode ring 44.

正極材41の内部には、軸線方向の一方の端部に補強部材としての網部材51が配置されている。すなわち、網部材51は、粉末状の正極合剤と一体化するように、正極リング44内に粉末状の正極合剤とともに配置された状態で加圧される。本実施形態では、網部材51を補強部材として用いているが、この限りではなく、板状の部材等、正極材41を補強可能な他の部材を補強部材として用いてもよい。   Inside the positive electrode material 41, a net member 51 as a reinforcing member is disposed at one end in the axial direction. That is, the net member 51 is pressed in a state where it is disposed together with the powdered positive electrode mixture in the positive electrode ring 44 so as to be integrated with the powdery positive electrode mixture. In the present embodiment, the net member 51 is used as the reinforcing member. However, the present invention is not limited to this, and another member that can reinforce the positive electrode material 41 such as a plate-like member may be used as the reinforcing member.

上述のように、正極材41は、粉末状の正極合剤を加圧成形した後、焼成することにより得られるため、脆くて壊れやすい。そのため、正極材41を上述のように正極リング44内に形成することで、該正極リング44によって正極材41の側面を補強することができる。また、上述のように正極材41の内部に網部材51を配置することにより、該網部材51によっても正極材41を補強することができる。正極材41の補強構造については後述する。   As described above, since the positive electrode material 41 is obtained by press-molding a powdered positive electrode mixture and firing it, it is brittle and easily broken. Therefore, the side surface of the positive electrode material 41 can be reinforced by forming the positive electrode material 41 in the positive electrode ring 44 as described above. Further, by arranging the net member 51 inside the positive electrode material 41 as described above, the positive electrode material 41 can also be reinforced by the net member 51. The reinforcing structure of the positive electrode material 41 will be described later.

セパレータ43は、ポリブチレンテレフタート製の繊維を素材とする不織布を用いて構成される。このセパレータ43は、扁平形電池1内で非水電解液によって含浸されている。なお、セパレータ43の厚みは、例えば、約0.3〜0.4mm程度である。   The separator 43 is configured using a non-woven fabric made of a polybutylene terephthalate fiber. The separator 43 is impregnated with a non-aqueous electrolyte in the flat battery 1. In addition, the thickness of the separator 43 is about 0.3-0.4 mm, for example.

非水電解液は、プロピレンカーボネイトと1,2−ジメトキシエタンとを混合した溶液にLiClOを溶解した溶液である。 The non-aqueous electrolyte is a solution in which LiClO 4 is dissolved in a solution obtained by mixing propylene carbonate and 1,2-dimethoxyethane.

(正極材の補強構造)
次に、正極材41の補強構造について図1を用いて説明する。
(Reinforcement structure of positive electrode material)
Next, the reinforcing structure of the positive electrode material 41 will be described with reference to FIG.

図1に示すように、略円柱状の正極材41は、側面を正極リング44によって覆われている。これにより、正極材41の側面を、正極リング44によって補強することができる。したがって、正極材41の側面が、扁平形電池1に入力された振動や衝撃等によって、損傷を受けるのを防止できる。   As shown in FIG. 1, the substantially cylindrical positive electrode material 41 is covered with a positive electrode ring 44 on the side surface. Thereby, the side surface of the positive electrode material 41 can be reinforced by the positive electrode ring 44. Therefore, it is possible to prevent the side surface of the positive electrode material 41 from being damaged by vibration, impact, or the like input to the flat battery 1.

また、図1に示すように、正極材41の軸線方向の一方の端部には、網部材51が配置されている。網部材51は、正極材41の軸線方向の両端部のうち、正極缶10の底部11上に位置する一方の端部に配置されている。網部材51は、軸線Pに対して交差する方向に拡がるように、すなわち、略円柱状の正極材41の端面に略平行になるように、正極材41内に配置されている。なお、網部材51は、正極材41の内部に、粉末状の正極合剤と一体化するように埋設されている。すなわち、正極材41内に網部材51を配置することで、正極材41を成形する際に、網部材51の網目内に粉末状の正極合剤が入り込んで、網部材51と正極合剤とが容易に一体化される。   As shown in FIG. 1, a net member 51 is disposed at one end of the positive electrode material 41 in the axial direction. The net member 51 is disposed at one end portion located on the bottom portion 11 of the positive electrode can 10 among both end portions of the positive electrode material 41 in the axial direction. The net member 51 is disposed in the positive electrode material 41 so as to expand in a direction intersecting with the axis P, that is, so as to be substantially parallel to the end surface of the substantially cylindrical positive electrode material 41. The net member 51 is embedded in the positive electrode material 41 so as to be integrated with the powdered positive electrode mixture. That is, by arranging the net member 51 in the positive electrode material 41, when forming the positive electrode material 41, the powdery positive electrode mixture enters the mesh of the net member 51, and the net member 51, the positive electrode mixture, Are easily integrated.

上述のように、網部材51を、正極材41の軸線方向の一方の端部に配置することで、正極材41において正極リング44によって覆われていない部分、すなわち正極材41における軸線方向の一方の端部の強度を向上することができる。また、網部材51を正極材41の内部に配置して正極合剤と一体化することにより、正極材41をより確実に補強することができる。さらに、網部材51は、正極材41の端面に対して略平行に配置されるため、正極材41の軸線方向の強度を向上することができる。   As described above, by arranging the mesh member 51 at one end in the axial direction of the positive electrode material 41, a portion of the positive electrode material 41 that is not covered by the positive electrode ring 44, that is, one of the positive electrode material 41 in the axial direction. The strength of the end of the can be improved. Moreover, the positive electrode material 41 can be reinforced more reliably by arranging the mesh member 51 inside the positive electrode material 41 and integrating it with the positive electrode mixture. Furthermore, since the net member 51 is disposed substantially parallel to the end face of the positive electrode material 41, the strength of the positive electrode material 41 in the axial direction can be improved.

また、網部材51を、正極材41の軸線方向の両端部のうち、正極缶10の底部11上に位置する一方の端部に配置することで、正極材41と正極缶10の底部11とをより確実に接触させることができる。すなわち、正極材41の一方の端部に網部材51を配置することにより、該一方の端部の剛性を向上できるとともに、該一方の端部の形状をより確実に保持することができる。   Further, the net member 51 is disposed at one end portion located on the bottom portion 11 of the positive electrode can 10 among the both end portions in the axial direction of the positive electrode material 41, whereby the positive electrode material 41 and the bottom portion 11 of the positive electrode can 10 are Can be contacted more reliably. That is, by arranging the net member 51 at one end of the positive electrode material 41, the rigidity of the one end can be improved and the shape of the one end can be more reliably maintained.

網部材51は、ステンレス鋼材からなる略円形状の部材である。網部材51は、正極材41の外径よりも小さい外径を有する。すなわち、網部材51の外径は、正極リング44の側壁部44aの内径よりも小さい。これにより、網部材51は、正極リング44の側壁部44aの内方に位置付けられる。   The net member 51 is a substantially circular member made of stainless steel. The net member 51 has an outer diameter smaller than the outer diameter of the positive electrode material 41. That is, the outer diameter of the net member 51 is smaller than the inner diameter of the side wall 44 a of the positive electrode ring 44. Thereby, the net member 51 is positioned inside the side wall portion 44 a of the positive electrode ring 44.

正極リング44の側壁部44aの内方に網部材51を配置することにより、正極材41の強度をより向上することができる。すなわち、側壁部44aによって正極材41の側面を補強しつつ、網部材51によって正極材41の軸線方向の強度を向上することができる。   By arranging the net member 51 inside the side wall portion 44 a of the positive electrode ring 44, the strength of the positive electrode material 41 can be further improved. That is, the strength of the positive electrode material 41 in the axial direction can be improved by the net member 51 while reinforcing the side surface of the positive electrode material 41 by the side wall portion 44a.

次に、正極リング44及び網部材51による正極材41の補強の効果について説明する。   Next, the effect of reinforcing the positive electrode material 41 by the positive electrode ring 44 and the net member 51 will be described.

正極材41の強度を計測するために、正極材41を正極リング44によって保持した状態で、正極材41を丸棒によって押圧した際の荷重の最大値を測定した。具体的には、正極材41を、載置台に形成された穴部の上方に位置付けるように該穴部の周縁部上に配置した状態で、穴部よりも小さい外径を有する丸棒によって正極材41を下方に押圧した。そして、正極材41が破損する際に正極材41に生じる応力の最大値(最大応力)を測定した。なお、正極材41の外径は15mmであり、穴部の外径は16mm、丸棒の外径は9.8mmであった。また、正極材41の厚みは1.75mmであった。正極材41は、二酸化マンガンに、黒鉛、テトラフルオロエチレン−ヘキサフルオロプロピレン共重合体及びヒドロキシプロピルセルロースを混合して調整された正極合剤を、正極リング44内に加圧成形した後、250度で12時間焼成することにより得た。   In order to measure the strength of the positive electrode material 41, the maximum value of the load when the positive electrode material 41 was pressed by a round bar in a state where the positive electrode material 41 was held by the positive electrode ring 44 was measured. Specifically, the positive electrode material 41 is placed on the periphery of the hole so as to be positioned above the hole formed in the mounting table, and the positive electrode is formed by a round bar having an outer diameter smaller than that of the hole. The material 41 was pressed downward. And the maximum value (maximum stress) of the stress which arises in the positive electrode material 41 when the positive electrode material 41 was damaged was measured. In addition, the outer diameter of the positive electrode material 41 was 15 mm, the outer diameter of the hole was 16 mm, and the outer diameter of the round bar was 9.8 mm. Moreover, the thickness of the positive electrode material 41 was 1.75 mm. The positive electrode material 41 is formed by pressing a positive electrode mixture prepared by mixing manganese dioxide, graphite, tetrafluoroethylene-hexafluoropropylene copolymer and hydroxypropyl cellulose into the positive electrode ring 44, and then forming 250 ° C. For 12 hours.

実験に用いた正極材41は、正極合剤のみからなる正極材(網部材なし)、一方の端部に網部材51が配置された正極材(網部材あり)と、両端部に網部材51が配置された正極材(両端部に網部材あり)の3種類を用意した。なお、正極材41内に配置された網部材51は、正極材41(成形体)の外径に対して約96%の外径を有する。   The positive electrode material 41 used in the experiment includes a positive electrode material (without a net member) made of only a positive electrode mixture, a positive electrode material (with a net member) in which a net member 51 is disposed at one end, and a net member 51 at both ends. Three types of positive electrode materials (having net members at both ends) in which are arranged are prepared. Note that the net member 51 disposed in the positive electrode material 41 has an outer diameter of about 96% with respect to the outer diameter of the positive electrode material 41 (molded body).

上述の条件で実験を行った結果、網部材なしの場合には正極材41が破損する際に生じる最大応力は約130kPaであり、網部材ありの場合には正極材41が破損する際に生じる最大応力は約240kPaであった。これにより、網部材ありの場合の正極材41は、網部材なしの場合の正極材に比べて、約2倍の強度を有することが分かった。また、両端部に網部材ありの場合に、正極材41が破損する際に生じる最大応力は約300kPaであった。これにより、正極材41の両端部に網部材を配置することで、正極材41の強度をさらに向上できることが分かった。   As a result of performing the experiment under the above-described conditions, the maximum stress generated when the positive electrode material 41 is broken is about 130 kPa when there is no net member, and when the positive electrode material 41 is broken when the net member is present. The maximum stress was about 240 kPa. Accordingly, it was found that the positive electrode material 41 with the net member has about twice the strength as compared with the positive electrode material without the net member. Further, in the case where there are net members at both ends, the maximum stress generated when the positive electrode material 41 is broken was about 300 kPa. Accordingly, it was found that the strength of the positive electrode material 41 can be further improved by arranging the net members at both ends of the positive electrode material 41.

また、正極材41の密度を変化させた場合の破壊荷重(正極材41が破壊される際に正極材41に作用している荷重)も、上述の最大応力と同様に、丸棒を用いて測定した。なお、正極材41は、内部に網部材51が配置された正極材(網部材あり)と、正極合剤のみからなる正極材(網部材なし)とを用意した。また、網部材ありの正極材41は、網部材51の外径を変えることにより、正極材41の密度を変化させた。   In addition, the breaking load when the density of the positive electrode material 41 is changed (the load acting on the positive electrode material 41 when the positive electrode material 41 is broken) is also a round bar as in the above-described maximum stress. It was measured. In addition, the positive electrode material 41 prepared the positive electrode material (with a net member) by which the net member 51 is arrange | positioned inside, and the positive electrode material (without a net member) which consists only of positive electrode mixtures. Further, in the positive electrode material 41 with the net member, the density of the positive electrode material 41 was changed by changing the outer diameter of the net member 51.

正極材41(成形体)の密度を変化させた場合の破壊荷重の変化を図4に示す。この図4から、成形体の密度が大きくなるほど、破壊荷重が大きくなることが分かる。また、網ありの場合には、網なしの場合に比べて破壊荷重が大きい。この傾向は、成形体の密度が大きくなるほど、すなわち、網部材51の外径が大きくなるほど顕著になる。よって、網部材51の外径は、正極材41内に配置可能な範囲で、できるだけ大きい方が好ましい。なお、図4において、網部材ありの場合と網部材なしの場合とで破壊荷重が同等の部分は、丸棒の外径よりも網部材の外径が小さい場合の計測結果である。   FIG. 4 shows changes in the breaking load when the density of the positive electrode material 41 (molded body) is changed. It can be seen from FIG. 4 that the breaking load increases as the density of the molded body increases. Further, when the net is present, the breaking load is larger than when the net is not present. This tendency becomes more prominent as the density of the molded body increases, that is, as the outer diameter of the net member 51 increases. Therefore, it is preferable that the outer diameter of the net member 51 is as large as possible within a range in which the net member 51 can be arranged in the positive electrode material 41. In FIG. 4, the portion with the same breaking load in the case with the net member and without the net member is a measurement result when the outer diameter of the net member is smaller than the outer diameter of the round bar.

(扁平形電池の製造方法)
次に、上述のような構成を有する扁平形電池1の製造方法について説明する。
(Manufacturing method of flat battery)
Next, a method for manufacturing the flat battery 1 having the above-described configuration will be described.

まず、有底円筒状の正極缶10及び負極缶20をそれぞれプレス成形によって形成する。また、正極材41及び負極材42をそれぞれ形成する。正極材41は、二酸化マンガンに、黒鉛、テトラフルオロエチレン−ヘキサフルオロプロピレン共重合体及びヒドロキシプロピルセルロースを混合して得られる粉末状の正極合剤を、プレス成形によって得られた正極リング44内に充填して加圧成形した後、焼成することにより得られる。なお、正極リング44内に粉末状の正極合剤を充填する際、途中で網部材51を正極リング44内に配置し、その上に粉末状の正極合剤をさらに充填する。これにより、正極リング44が正極材41の内部に埋設される。なお、負極材42は、金属リチウムまたはリチウム合金を円盤状に形成することによって得られる。   First, the bottomed cylindrical positive electrode can 10 and negative electrode can 20 are each formed by press molding. Moreover, the positive electrode material 41 and the negative electrode material 42 are formed, respectively. In the positive electrode ring 44 obtained by press molding, a positive electrode material 41 is a powdered positive electrode mixture obtained by mixing manganese dioxide, graphite, tetrafluoroethylene-hexafluoropropylene copolymer and hydroxypropyl cellulose. It is obtained by firing after filling and pressure molding. When filling the positive electrode ring 44 with the powdery positive electrode mixture, the mesh member 51 is disposed in the middle of the positive electrode ring 44 and further filled with the powdery positive electrode mixture. As a result, the positive electrode ring 44 is embedded in the positive electrode material 41. The negative electrode material 42 is obtained by forming metallic lithium or a lithium alloy into a disc shape.

正極缶10の内方に、略円柱状の正極材41を保持した正極リング44を配置するとともに、該正極材41上に、セパレータ43及び負極材42の順に積層する。一方、負極缶20の周壁部22に、ガスケット30を装着する。   A positive electrode ring 44 holding a substantially cylindrical positive electrode material 41 is disposed inside the positive electrode can 10, and a separator 43 and a negative electrode material 42 are stacked in this order on the positive electrode material 41. On the other hand, the gasket 30 is attached to the peripheral wall portion 22 of the negative electrode can 20.

ガスケット30が装着された負極缶20を、正極リング44、セパレータ43及び負極材42が収納された正極缶10に対し、その開口を覆うように配置する。負極缶20は、周壁部22が正極缶10の内方に位置付けられるように、該正極缶10に対して組み合わされる。正極缶10と負極缶20とを組み合わせた状態で、正極缶10の周壁部12の開口端側を、負極缶20の周壁部22に対してかしめる。   The negative electrode can 20 to which the gasket 30 is attached is arranged so as to cover the opening of the positive electrode can 10 in which the positive electrode ring 44, the separator 43, and the negative electrode material 42 are accommodated. The negative electrode can 20 is combined with the positive electrode can 10 such that the peripheral wall portion 22 is positioned inside the positive electrode can 10. In a state where the positive electrode can 10 and the negative electrode can 20 are combined, the open end side of the peripheral wall portion 12 of the positive electrode can 10 is caulked against the peripheral wall portion 22 of the negative electrode can 20.

これにより、図1に示すような扁平形電池1が得られる。   Thereby, the flat battery 1 as shown in FIG. 1 is obtained.

(実施形態の効果)
以上の構成では、略円柱状の正極材41は、その側面を正極リング44によって保持されている。これにより、正極材41の側面の強度を向上することができる。また、正極材41には、軸線方向の端部に網部材51が配置されている。これにより、正極材41の軸線方向の強度を向上することができる。したがって、正極リング44及び網部材51によって、正極材41の耐振動性及び耐衝撃性を向上することができる。よって、振動等によって正極材41の一部が欠落して内部短絡を生じるのをより確実に防止できる。
(Effect of embodiment)
In the above configuration, the side surface of the substantially cylindrical positive electrode material 41 is held by the positive electrode ring 44. Thereby, the intensity | strength of the side surface of the positive electrode material 41 can be improved. Further, a net member 51 is disposed at the end of the positive electrode material 41 in the axial direction. Thereby, the intensity | strength of the axial direction of the positive electrode material 41 can be improved. Therefore, the positive electrode ring 44 and the net member 51 can improve the vibration resistance and impact resistance of the positive electrode material 41. Therefore, it is possible to more reliably prevent a part of the positive electrode material 41 from being lost due to vibration or the like and causing an internal short circuit.

網部材51は、正極材41の軸線方向の両端部のうち、正極缶10の底部11上に位置する一方の端部に配置されている。これにより、正極材41の一方の端部の強度を向上できるとともに、該一方の端部の変形を抑制できる。したがって、正極材41と正極缶10の底部11とをより確実に接触させることができる。   The net member 51 is disposed at one end portion located on the bottom portion 11 of the positive electrode can 10 among both end portions of the positive electrode material 41 in the axial direction. Thereby, while the intensity | strength of one edge part of the positive electrode material 41 can be improved, a deformation | transformation of this one edge part can be suppressed. Therefore, the positive electrode material 41 and the bottom part 11 of the positive electrode can 10 can be brought into contact with each other more reliably.

また、正極材41内に網部材51を埋設することにより、正極材41を成形する際に、網部材51の網目の中に粉末状の正極合剤が入りこんで、網部材51と正極合剤とがより強固に一体化される。これにより、正極材41の強度をより確実に向上することができる。   Further, by embedding the net member 51 in the positive electrode material 41, when forming the positive electrode material 41, the powdery positive electrode mixture enters the mesh of the net member 51, and the net member 51 and the positive electrode mixture are mixed. Are more firmly integrated. Thereby, the intensity | strength of the positive electrode material 41 can be improved more reliably.

正極リング44は、正極材41を保持する側壁部44aと、径方向外方に延びて正極缶10の底部11と負極缶20の周壁部22との間に挟み込まれるフランジ部44bとを有する。これにより、正極リング44を正極缶10及び負極缶20に対して固定することができる。したがって、扁平形電池1に振動が入力された際に、該扁平形電池1内で正極材41が移動して衝撃を受けるのを防止できる。また、正極缶10に対する正極リング44の移動を抑制することにより、正極材41と負極材42との間に位置するセパレータ43が損傷を受けたり、正極材41と正極缶10との電気的な接触が不安定になったりするのを防止できる。   The positive electrode ring 44 includes a side wall portion 44 a that holds the positive electrode material 41, and a flange portion 44 b that extends radially outward and is sandwiched between the bottom portion 11 of the positive electrode can 10 and the peripheral wall portion 22 of the negative electrode can 20. Thereby, the positive electrode ring 44 can be fixed to the positive electrode can 10 and the negative electrode can 20. Therefore, when vibration is input to the flat battery 1, it is possible to prevent the positive electrode material 41 from moving within the flat battery 1 and receiving an impact. Further, by suppressing the movement of the positive electrode ring 44 with respect to the positive electrode can 10, the separator 43 positioned between the positive electrode material 41 and the negative electrode material 42 is damaged or the electrical connection between the positive electrode material 41 and the positive electrode can 10 can be prevented. It is possible to prevent the contact from becoming unstable.

また、本実施形態では、正極リング44のフランジ部44bは、正極缶10の筒軸方向から見て、外周端が負極缶20の拡径部22bの開口端(周壁部22の開口端)よりも外方に位置している。これにより、正極リング44のフランジ部44bを、負極缶20の周壁部22の開口端と正極缶10の底部11の内面との間でより確実に挟み込むことができる。したがって、正極リング44を、正極缶10及び負極缶20に対してより確実に固定することができる。   Further, in the present embodiment, the flange portion 44b of the positive electrode ring 44 has an outer peripheral end that is larger than the opening end of the enlarged diameter portion 22b of the negative electrode can 20 (the opening end of the peripheral wall portion 22) when viewed from the cylindrical axis direction of the positive electrode can 10. Is also located outside. Thereby, the flange portion 44 b of the positive electrode ring 44 can be more reliably sandwiched between the open end of the peripheral wall portion 22 of the negative electrode can 20 and the inner surface of the bottom portion 11 of the positive electrode can 10. Therefore, the positive electrode ring 44 can be more reliably fixed to the positive electrode can 10 and the negative electrode can 20.

(その他の実施形態)
以上、本発明の実施の形態を説明したが、上述した実施の形態は本発明を実施するための例示に過ぎない。よって、本発明は上述した実施の形態に限定されることなく、その趣旨を逸脱しない範囲内で上述した実施の形態を適宜変形して実施することが可能である。
(Other embodiments)
While the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiment, and can be implemented by appropriately modifying the above-described embodiment without departing from the spirit thereof.

前記実施形態では、網部材51は、正極材41の軸線方向の端部に配置されている。しかしながら、正極リング44によって覆われていない部分であれば、網部材51を、正極材41の内部または表面のどこに配置してもよい。例えば、網部材51を、正極材41内の軸線方向の中央部分に配置してもよい。また、網部材51の一部は、正極材41のうち正極リング44によって覆われている部分に配置されていてもよい。さらに、前記実施形態では、網部材51は、正極材41内に、前記軸線方向と交差するように配置されているが、正極材41を補強可能な配置であれば、網部材51をどのように配置してもよい。   In the embodiment, the net member 51 is disposed at the end of the positive electrode material 41 in the axial direction. However, as long as the portion is not covered by the positive electrode ring 44, the net member 51 may be disposed anywhere inside or on the surface of the positive electrode material 41. For example, the net member 51 may be disposed in the central portion of the positive electrode material 41 in the axial direction. Further, a part of the net member 51 may be disposed in a portion of the positive electrode material 41 that is covered with the positive electrode ring 44. Furthermore, in the said embodiment, although the net member 51 is arrange | positioned in the positive electrode material 41 so that it may cross | intersect the said axial direction, if the arrangement | positioning which can reinforce the positive electrode material 41 is used, what is the net member 51? You may arrange in.

前記実施形態では、正極材41の軸線方向の両端部のうち、網部材51が位置する一方の端部が、正極缶10の底部11上に位置している。しかしながら、正極材41の軸線方向の両端部のうち、網部材51が位置しない他方の端部が、正極缶10の底部11上に位置するように、正極材41が配置されていてもよい。   In the embodiment, one end where the net member 51 is positioned is located on the bottom 11 of the positive electrode can 10 among both ends in the axial direction of the positive electrode material 41. However, the positive electrode material 41 may be arranged so that the other end portion where the mesh member 51 is not located is positioned on the bottom portion 11 of the positive electrode can 10 among both end portions in the axial direction of the positive electrode material 41.

前記実施形態では、正極リング44のフランジ部44bは、扁平形電池1の軸線方向から見て、外周端が負極缶20の拡径部22bの開口端よりも外方に位置するような大きさである。しかしながら、正極リング44のフランジ部44bは、扁平形電池1の軸線方向から見て、外周端が負極缶20の拡径部22bの内周面よりも外方に位置するような大きさであってもよい。   In the embodiment, the flange portion 44 b of the positive electrode ring 44 is sized so that the outer peripheral end is located outward from the open end of the enlarged diameter portion 22 b of the negative electrode can 20 as viewed from the axial direction of the flat battery 1. It is. However, the flange portion 44 b of the positive electrode ring 44 is sized so that the outer peripheral end is located outward from the inner peripheral surface of the enlarged diameter portion 22 b of the negative electrode can 20 when viewed from the axial direction of the flat battery 1. May be.

前記実施形態では、正極リング44のフランジ部44bが、側壁部44aの外周全周に亘って円環状に形成されている。しかしながら、フランジ部を側壁部44aの一部のみに設けてもよい。ただし、図3の関係を有する場合には、側壁部44aを挟んで対向する部分にフランジ部を設ける必要がある。また、フランジ部の形状は、円環状以外の形状であってもよい。同様に、側壁部44aの形状も円筒状以外の形状であってもよい。   In the said embodiment, the flange part 44b of the positive electrode ring 44 is formed in the annular | circular shape over the outer periphery perimeter of the side wall part 44a. However, you may provide a flange part only in a part of side wall part 44a. However, in the case of having the relationship of FIG. 3, it is necessary to provide a flange portion at a portion facing the side wall portion 44 a. Further, the shape of the flange portion may be a shape other than an annular shape. Similarly, the shape of the side wall 44a may be other than a cylindrical shape.

前記実施形態では、正極リング44は側壁部44aから径方向外方に延びるフランジ部44bを有する。しかしながら、正極リングは、側壁部44aから径方向外方に延びるフランジ部を備えていなくてもよい。また、フランジ部は、側壁部44aから径方向内方に延びていてもよい。   In the embodiment, the positive electrode ring 44 has the flange portion 44b that extends radially outward from the side wall portion 44a. However, the positive electrode ring may not include a flange portion that extends radially outward from the side wall portion 44a. The flange portion may extend radially inward from the side wall portion 44a.

前記実施形態では、正極リング44は正極材41を保持している。しかしながら、正極リング44は正極材41だけでなく負極材42も保持するように構成されていてもよい。この場合には、負極材42に網部材を設けてもよい。   In the embodiment, the positive electrode ring 44 holds the positive electrode material 41. However, the positive electrode ring 44 may be configured to hold not only the positive electrode material 41 but also the negative electrode material 42. In this case, a net member may be provided on the negative electrode material 42.

前記実施形態では、負極缶20の周壁部22は、開口側の端面が正極缶10の底部11側に位置するように、概略円筒状に形成されている。しかしながら、負極缶の周壁部の開口側を折り曲げて、その折曲部分と正極缶10の底部11との間でガスケット30を挟み込んでもよい。   In the embodiment, the peripheral wall portion 22 of the negative electrode can 20 is formed in a substantially cylindrical shape so that the end surface on the opening side is located on the bottom 11 side of the positive electrode can 10. However, the opening side of the peripheral wall portion of the negative electrode can may be bent, and the gasket 30 may be sandwiched between the bent portion and the bottom portion 11 of the positive electrode can 10.

前記実施形態では、正極缶10を外装缶としていて、負極缶20を封口缶としているが、逆に正極缶が封口缶で、負極缶が外装缶であってもよい。この場合には、正極材と負極材の配置も逆になるため、負極材を保持する負極リングが外装缶である負極缶に固定される。   In the embodiment, the positive electrode can 10 is an outer can and the negative electrode can 20 is a sealed can. Conversely, the positive electrode can may be a sealed can and the negative electrode can may be an outer can. In this case, since the arrangement of the positive electrode material and the negative electrode material is reversed, the negative electrode ring holding the negative electrode material is fixed to the negative electrode can which is an outer can.

前記実施形態では、正極材41は略円柱状である。しかしながら、正極材41は、柱状であれば、四角柱など、他の形状であってもよい。   In the embodiment, the positive electrode material 41 has a substantially cylindrical shape. However, the positive electrode material 41 may have other shapes such as a quadrangular column as long as it is columnar.

本発明による扁平形電池は、衝撃を受ける環境下で使用される機器の電池として利用可能である。   The flat battery according to the present invention can be used as a battery for equipment used in an environment subject to an impact.

1:扁平形電池、10:正極缶(外装缶)、11:底部、12:周壁部(筒状側壁部)、20:負極缶(封口缶)、22:周壁部、30:ガスケット(シール部材)、41:正極材、42:負極材、44:正極リング(台座)、44a:側壁部(保持部)、44b:フランジ部、51:網部材(補強部材)、P:軸線 1: flat battery, 10: positive electrode can (exterior can), 11: bottom, 12: peripheral wall (cylindrical side wall), 20: negative electrode can (sealing can), 22: peripheral wall, 30: gasket (seal member) ), 41: positive electrode material, 42: negative electrode material, 44: positive electrode ring (pedestal), 44a: side wall portion (holding portion), 44b: flange portion, 51: mesh member (reinforcing member), P: axis

Claims (8)

有底筒状の外装缶と、
前記外装缶の開口を覆う有底筒状の封口缶と、
前記外装缶と前記封口缶との間に形成される空間内に配置された正極材及び負極材と、
前記正極材及び前記負極材のうち少なくとも一方の部材を保持する台座と、
前記少なくとも一方の部材において前記台座によって覆われていない部分に配置され、当該部分を補強する補強部材とを備える、扁平形電池。
A bottomed cylindrical outer can,
A bottomed cylindrical sealing can covering the opening of the outer can;
A positive electrode material and a negative electrode material disposed in a space formed between the outer can and the sealed can;
A pedestal that holds at least one member of the positive electrode material and the negative electrode material;
A flat battery comprising: a reinforcing member that is disposed on a portion of the at least one member that is not covered by the pedestal and that reinforces the portion.
請求項1に記載の扁平形電池において、
前記一方の部材は、軸線方向に延びる柱状に形成されていて、
前記台座は、前記一方の部材の側面を覆うように配置されていて、
前記補強部材は、前記一方の部材における前記軸線方向の端面に配置されている、扁平形電池。
The flat battery according to claim 1,
The one member is formed in a column shape extending in the axial direction,
The pedestal is disposed so as to cover a side surface of the one member,
The reinforcing battery is a flat battery disposed on an end face in the axial direction of the one member.
請求項2に記載の扁平形電池において、
前記補強部材は、前記軸線方向と交差する方向に拡がるように、前記一方の部材内に配置されている、扁平形電池。
The flat battery according to claim 2,
The flat battery, wherein the reinforcing member is disposed in the one member so as to extend in a direction intersecting the axial direction.
請求項2または3に記載の扁平形電池において、
前記一方の部材は、前記外装缶上に前記端面が位置するように配置されている、扁平形電池。
The flat battery according to claim 2 or 3,
The said one member is a flat battery which is arrange | positioned so that the said end surface may be located on the said exterior can.
請求項1から4のいずれか一つに記載の扁平形電池において、
前記外装缶は、底部と、前記軸線方向に延びる筒状側壁部とを有し、
前記封口缶は、前記外装缶の開口を覆った状態で前記外装缶の内方に位置付けられる周壁部を有し、
前記台座は、前記一方の部材を保持する保持部と、前記軸線方向から見て前記封口缶の周壁部の開口端と重なるように前記保持部から外方に延びるフランジ部とを有し、
前記フランジ部は、前記封口缶の周壁部の開口端と前記外装缶の底部の内面との間に挟み込まれている、扁平形電池。
The flat battery according to any one of claims 1 to 4,
The outer can has a bottom portion and a cylindrical side wall portion extending in the axial direction,
The sealed can has a peripheral wall portion positioned inward of the outer can in a state of covering an opening of the outer can.
The pedestal includes a holding portion that holds the one member, and a flange portion that extends outward from the holding portion so as to overlap an opening end of a peripheral wall portion of the sealing can as viewed from the axial direction,
The flat battery, wherein the flange portion is sandwiched between an open end of a peripheral wall portion of the sealing can and an inner surface of a bottom portion of the outer can.
請求項5に記載の扁平形電池において、
前記フランジ部は、前記軸線方向から見て、外周端が前記封口缶の周壁部の開口端よりも外方に位置するような大きさに形成されている、扁平形電池。
The flat battery according to claim 5,
The flat battery, wherein the flange portion is formed to have a size such that an outer peripheral end is positioned outward from an opening end of a peripheral wall portion of the sealing can as viewed from the axial direction.
請求項5または6に記載の扁平形電池において、
前記封口缶の周壁部の開口端と前記外装缶の底部の内面との間には、シール部材が配置されていて、
前記フランジ部は、前記シール部材と前記外装缶の底部の内面との間に挟み込まれる、扁平形電池。
The flat battery according to claim 5 or 6,
Between the opening end of the peripheral wall portion of the sealing can and the inner surface of the bottom portion of the exterior can, a sealing member is disposed,
The flange portion is a flat battery that is sandwiched between the seal member and the inner surface of the bottom portion of the outer can.
請求項1から7のいずれか一つに記載の扁平形電池において、
前記補強部材は、網状の部材である、扁平形電池。
The flat battery according to any one of claims 1 to 7,
The reinforcing member is a flat battery that is a net-like member.
JP2013118093A 2012-06-15 2013-06-04 Flat battery Active JP6151974B2 (en)

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