JP2015099739A - Power storage element and manufacturing method of the same - Google Patents

Power storage element and manufacturing method of the same Download PDF

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JP2015099739A
JP2015099739A JP2013239899A JP2013239899A JP2015099739A JP 2015099739 A JP2015099739 A JP 2015099739A JP 2013239899 A JP2013239899 A JP 2013239899A JP 2013239899 A JP2013239899 A JP 2013239899A JP 2015099739 A JP2015099739 A JP 2015099739A
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connection plate
auxiliary member
electrode body
plate portion
end surface
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JP6330295B2 (en
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訓良 胸永
Kuniyoshi Munenaga
胸永  訓良
義隆 塚田
Yoshitaka Tsukada
義隆 塚田
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Lithium Energy Japan KK
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E60/10Energy storage using batteries

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Abstract

PROBLEM TO BE SOLVED: To provide a power storage element that is formed by connecting an electrode body and a collector using an auxiliary member, capable of efficiently performing the connection, and having high quality.SOLUTION: The power storage element includes: a battery; an electrode body 120; a collector 140 having a connection plate part 142 connected to a lamination part 123a of the electrode body 120; and an auxiliary member 150 so disposed as to surround at least the lamination part 123a and an outer end face 146 of the connection plate part 142. The auxiliary member 150 has a projection 155 provided in a projected manner in a direction toward the connection plate part 142 from a plane opposing the outer end face 146 of the connection plate part 142.

Description

本発明は、電極体および電極体に接続された集電体を備える蓄電素子に関する。   The present invention relates to an electric storage element including an electrode body and a current collector connected to the electrode body.

従来、リチウムイオン二次電池などの蓄電素子は、例えば、正極および負極と、正極と負極との間に配置されたセパレータとが積層された電極体を有する。   Conventionally, a power storage element such as a lithium ion secondary battery has, for example, an electrode body in which a positive electrode and a negative electrode, and a separator disposed between the positive electrode and the negative electrode are stacked.

電極体の正極および負極のそれぞれの端部には、活物質が塗布されていない金属箔部分が積層された積層部が形成され、積層部には、集電体と呼ばれる金属製の部材が接続される。   At each end of the positive electrode and negative electrode of the electrode body, a laminated part is formed by laminating a metal foil part not coated with an active material, and a metal member called a current collector is connected to the laminated part Is done.

また、集電体には、正極端子または負極端子である電極端子が接続され、電極端子を介して、モータ等の負荷に当該電極体からの電力が供給される。   In addition, an electrode terminal which is a positive electrode terminal or a negative electrode terminal is connected to the current collector, and power from the electrode body is supplied to a load such as a motor via the electrode terminal.

このような構造の蓄電素子における、電極体の積層部と集電体とを接合する手法として、振動を用いた溶接が用いられる場合がある。   In a power storage device having such a structure, welding using vibration may be used as a method of joining the stacked portion of the electrode body and the current collector.

例えば、積層部と集電体とを重ねて加圧した状態で超音波による振動を与えて、積層部と集電体とを接合する超音波溶接と呼ばれる手法がある。   For example, there is a technique called ultrasonic welding in which a laminate portion and a current collector are superposed and pressurized, and vibrations are applied by ultrasonic waves to join the laminate portion and the current collector.

特許文献1には、積層された極箔で構成された突出部を有する電極体と、突出部に当接する当接部を有する集電体と、突出部を集電体の当接部とで挟んで接合する金属材とを備える蓄電素子が開示されている。   In Patent Document 1, an electrode body having a projecting portion constituted by laminated electrode foils, a current collector having an abutting portion that abuts on the projecting portion, and a projecting portion as an abutting portion of the current collector. An electric storage element including a metal material sandwiched and bonded is disclosed.

この蓄電素子では、電極体の突出部(積層部)に金属材を当てた状態で、超音波溶接が行われており、この金属材の端部が、集電体の当接部から離れる方向に変位していることで、極箔に亀裂等の損傷の抑制が図られている。   In this power storage element, ultrasonic welding is performed in a state in which a metal material is applied to the protruding portion (stacked portion) of the electrode body, and the end of the metal material is away from the contact portion of the current collector. Therefore, it is possible to suppress damage such as cracks in the electrode foil.

特開2013−65552号公報JP 2013-65552 A

ここで、上記特許文献1における金属材のような、振動を用いた溶接における補助的な部材(補助部材)として、電極体の積層部を挟み込むように折り曲げられた板状の金属部材(例えば挟持部材またはクリップ等と呼ばれる)が用いられる場合がある。   Here, a plate-like metal member (for example, sandwiched) that is bent so as to sandwich the laminated portion of the electrode body as an auxiliary member (auxiliary member) in welding using vibration, such as the metal material in Patent Document 1 above. (Referred to as members or clips) may be used.

しかしながら、このような金属部材を電極体の積層部に取り付けた後であって、積層部と集電体の接続板部とを接合する前に、例えば搬送時の振動等により、金属部材が取り付けた位置からずれることがある。   However, after attaching such a metal member to the laminated part of the electrode body and before joining the laminated part and the connecting plate part of the current collector, the metal member is attached by, for example, vibration during transportation. May deviate from the position.

また、例えば接合時の振動により、金属部材が接続板部に対してずり動くことがある。その結果、電極体の表面に近い位置に存在する、金属部材の端部が、電極体と干渉することも考えられる。   In addition, for example, the metal member may slide with respect to the connection plate portion due to vibration during joining. As a result, it is also conceivable that the end portion of the metal member present near the surface of the electrode body interferes with the electrode body.

例えば、金属部材を接続板部に仮止めし易いように、金属部材の端部が折り曲げられて、接続板部の内端面(当該積層部とは逆極側の側面)に係止されている場合、当該折り曲げられた部分の端縁は、電極体の表面に非常に近い位置に存在する。そのため、接合時の振動によって金属部材がずり動いた場合、電極体と当該端縁とが干渉する可能性が高くなるといえる。   For example, the end of the metal member is bent and locked to the inner end surface of the connection plate (the side opposite to the laminated portion) so that the metal member can be temporarily fixed to the connection plate. In this case, the edge of the bent portion exists at a position very close to the surface of the electrode body. Therefore, it can be said that there is a high possibility that the electrode body and the edge interfere with each other when the metal member slides due to vibration during bonding.

本発明は、上記従来の課題を考慮し、電極体と集電体とが補助部材を用いて接合される蓄電素子であって、当該接合を効率よく行うことができ、かつ、品質の高い蓄電素子を提供することを目的とする。   The present invention is a power storage element in which an electrode body and a current collector are bonded using an auxiliary member in consideration of the above-described conventional problems, and the bonding can be performed efficiently and has high quality. An object is to provide an element.

上記目的を達成するために、本発明の一態様に係る蓄電素子は、電極体と、前記電極体の端部に接合された接続板部を有する集電体と、少なくとも前記電極体の前記端部と、前記接続板部の外側の端面である外端面とを囲むように配置された補助部材とを備え、前記補助部材は、前記接続板部の前記外端面に対向する面から前記接続板部の方向に突出状に設けられる突出部を有する。   In order to achieve the above object, a power storage element according to one embodiment of the present invention includes an electrode body, a current collector including a connection plate portion bonded to an end portion of the electrode body, and at least the end of the electrode body. And an auxiliary member disposed so as to surround an outer end surface that is an outer end surface of the connection plate portion, and the auxiliary member extends from the surface facing the outer end surface of the connection plate portion to the connection plate. A protrusion provided in a protruding manner in the direction of the portion.

この構成によれば、少なくとも電極体の端部および接続板部の外端面が補助部材に囲まれた状態で、電極体の端部(正極または負極の端部)と、集電体の接続板部とが接合されている。   According to this configuration, at least the end portion of the electrode body and the outer end surface of the connection plate portion are surrounded by the auxiliary member, the end portion of the electrode body (the end portion of the positive electrode or the negative electrode), and the connection plate of the current collector The part is joined.

この補助部材は、接続板部の外端面に対向する面から突出状に設けられ設けられた突出部を有している。すなわち、補助部材は、突出部が接続板部の外端面を押圧することが可能な構造を有している。   The auxiliary member has a protruding portion that is provided so as to protrude from a surface facing the outer end surface of the connection plate portion. That is, the auxiliary member has a structure in which the protruding portion can press the outer end surface of the connecting plate portion.

これにより、補助部材の、接続板部の幅方向の移動(ずれ)が抑制される。具体的には、補助部材の電極体の方向へのずれが抑制される。   Thereby, the movement (shift | offset | difference) of the width direction of a connection board part of an auxiliary member is suppressed. Specifically, the shift of the auxiliary member in the direction of the electrode body is suppressed.

そのため、電極体の端部と集電体の接続板部との、超音波溶接等による接合時において、補助部材の位置の安定性が向上する。   Therefore, the stability of the position of the auxiliary member is improved at the time of joining the end portion of the electrode body and the connecting plate portion of the current collector by ultrasonic welding or the like.

その結果、例えば、超音波溶接等による接合の際に、補助部材の端部が電極体の表面と干渉するような事態の発生が抑制され、これにより、例えば、微小な金属片等の異物の発生が抑制される。   As a result, for example, during joining by ultrasonic welding or the like, the occurrence of a situation in which the end of the auxiliary member interferes with the surface of the electrode body is suppressed. Occurrence is suppressed.

このように、本態様の蓄電素子は、電極体と集電体とが補助部材を用いて接合される蓄電素子であって、当該接合を効率よく行うことができ、かつ、品質の高い蓄電素子である。   As described above, the power storage device of this aspect is a power storage device in which the electrode body and the current collector are joined using the auxiliary member, and can perform the joining efficiently and has a high quality. It is.

また、本発明の一態様に係る蓄電素子において、前記補助部材は、前記電極体の前記端部と接合された第一片部と、前記接続板部と接続された第二片部と、前記第一片部および前記第二片部を接続する接続片部とを有し、前記突出部は、前記補助部材における、前記接続板部の前記外端面に対向する面である、前記接続片部の内面から前記接続板部の方向に突出状に設けられているとしてもよい。   Moreover, in the energy storage device according to one aspect of the present invention, the auxiliary member includes a first piece joined to the end of the electrode body, a second piece connected to the connection plate, and the The connection piece part which has a connection piece part which connects the 1st piece part and the 2nd piece part, and the projection part is a field which counters the outer end face of the connection plate part in the auxiliary member. It may be provided so as to protrude from the inner surface of the connector in the direction of the connecting plate portion.

この構成によれば、補助部材は、第一片部および第二片部で、電極体の端部と集電体の接続板部とを挟むように配置され、かつ、第一片部および第二片部を接続する接続片部の内面に設けられた突出部で接続板部の外端面を押圧することができる。   According to this configuration, the auxiliary member is disposed between the first piece portion and the second piece portion so as to sandwich the end portion of the electrode body and the connection plate portion of the current collector, and the first piece portion and the second piece portion. The outer end surface of the connecting plate portion can be pressed by the protruding portion provided on the inner surface of the connecting piece portion connecting the two pieces.

これにより、電極体の端部と集電体の接続板部との接合時またはその接合の前の準備の際において、補助部材の位置の安定性がさらに向上される。その結果、例えば、電極体の端部と集電体の接続板部との接合前の半完成品の状態での扱いが容易化されるとともに、接合時における異物の発生が抑制される。   Thereby, the stability of the position of the auxiliary member is further improved at the time of joining the end portion of the electrode body and the connecting plate portion of the current collector or at the time of preparation before the joining. As a result, for example, handling in the state of a semi-finished product before joining the end portion of the electrode body and the connecting plate portion of the current collector is facilitated, and generation of foreign matters during joining is suppressed.

また、本発明の一態様に係る蓄電素子において、前記第二片部は、前記接続板部の内側の端面である内端面に沿った方向に曲げられた折返し部を有するとしてもよい。   Moreover, the electrical storage element which concerns on 1 aspect of this invention WHEREIN: Said 2nd piece part is good also as having a folding | returning part bent in the direction along the inner end surface which is an inner end surface of the said connection board part.

この構成によれば、補助部材は、接続板部を、厚み方向と交差する方向(幅方向)における両側から、付勢力を与えなら挟み込む構造を有している。これにより、補助部材の、接続板部の幅方向のずれが、より確実に抑制される。   According to this configuration, the auxiliary member has a structure in which the connecting plate portion is sandwiched if an urging force is applied from both sides in the direction (width direction) intersecting the thickness direction. Thereby, the shift | offset | difference of the width direction of a connection board part of an auxiliary member is suppressed more reliably.

また、本発明の一態様に係る蓄電素子において、前記突出部は、前記接続板部の前記外端面に接触しているとしてもよい。   Moreover, the electrical storage element which concerns on 1 aspect of this invention WHEREIN: The said protrusion part is good also as contacting the said outer end surface of the said connection board part.

また、本発明の一態様に係る蓄電素子において、前記突出部は、前記補助部材の一部が前記接続板部の方向に突出することで形成されているとしてもよい。   In the energy storage device according to one embodiment of the present invention, the protruding portion may be formed by protruding a part of the auxiliary member in the direction of the connection plate portion.

この構成によれば、突出部が、補助部材の一体物として提供されるため、例えば、蓄電素子の生産効率の向上、および生産管理の容易化等が図られる。   According to this configuration, since the protruding portion is provided as an integrated member of the auxiliary member, for example, the production efficiency of the power storage element can be improved and the production management can be facilitated.

また、本発明の一態様に係る蓄電素子の製造方法は、電極体と、前記電極体の端部に接合された接続板部を有する集電体と、補助部材とを備える蓄電素子の製造方法であって、前記電極体の前記端部および前記接続板部を挟むように前記補助部材を前記接続板部に取り付ける取付工程と、前記取付工程の後に、前記補助部材に挟まれた状態の前記電極体の前記端部と前記接続板部とを接合する接合工程とを含み、前記取付工程は、前記補助部材を構成する金属製の板材に対し、前記板材の端縁を折り曲げることによって形成された折返し部が、前記接続板部の内側の端面である内端面に当接するように、前記板材を前記接続板部に配置する配置工程と、前記折返し部が前記接続板部の前記内端面に当接した状態で、前記板材に突出状に設けられた突出部が前記接続板部の外側の端面である外端面に接触し、かつ、前記板材が、前記電極体の前記端部および前記接続板部を挟むように、前記板材を折り曲げる折り曲げ工程とを含む。   In addition, a method for manufacturing a power storage element according to one embodiment of the present invention includes a method for manufacturing a power storage element including an electrode body, a current collector having a connection plate joined to an end of the electrode body, and an auxiliary member. The attachment step of attaching the auxiliary member to the connection plate portion so as to sandwich the end portion of the electrode body and the connection plate portion, and the state of being sandwiched by the auxiliary member after the attachment step A joining step of joining the end portion of the electrode body and the connecting plate portion, and the attachment step is formed by bending an edge of the plate member with respect to a metal plate member constituting the auxiliary member. An arrangement step of arranging the plate material on the connection plate portion so that the folded portion abuts on an inner end surface that is an inner end surface of the connection plate portion, and the turn-up portion on the inner end surface of the connection plate portion. In a state of contact, the plate member is provided in a protruding shape. A bending step of bending the plate material such that the protruding portion contacts an outer end surface that is an outer end surface of the connection plate portion, and the plate material sandwiches the end portion and the connection plate portion of the electrode body; including.

この方法によれば、補助部材は、接続板部を、厚み方向と交差する幅方向における両側から、積極的に挟みこむ構造を有している。   According to this method, the auxiliary member has a structure in which the connecting plate portion is positively sandwiched from both sides in the width direction intersecting the thickness direction.

そのため、電極体の端部と集電体の接続板部との、超音波溶接等による接合時またはその接合の前の準備の際において、補助部材の接続板部に対するずり動きが抑制される。   Therefore, when the end portion of the electrode body and the connection plate portion of the current collector are joined by ultrasonic welding or the preparation before the joining, the sliding movement of the auxiliary member with respect to the connection plate portion is suppressed.

その結果、例えば、超音波溶接等による接合の際に、補助部材の折返し部が電極体の表面と干渉するような事態の発生が抑制され、これにより、例えば、微小な金属片等の異物の発生が抑制される。   As a result, for example, when joining by ultrasonic welding or the like, the occurrence of a situation in which the folded portion of the auxiliary member interferes with the surface of the electrode body is suppressed. Occurrence is suppressed.

従って、本態様に係る蓄電素子の製造方法によれば、電極体と集電体とが補助部材を用いて接合される蓄電素子であって、当該接合を効率よく行うことができ、かつ、品質の高い蓄電素子を製造することができる。   Therefore, according to the method for manufacturing the electricity storage device according to this aspect, the electrode body and the current collector are joined using the auxiliary member, the joining can be performed efficiently, and the quality is improved. Can be manufactured.

本発明によれば、電極体と集電体とが補助部材を用いて接合される蓄電素子であって、当該接合を効率よく行うことができ、かつ、品質の高い蓄電素子を提供することができる。   According to the present invention, there is provided a power storage element in which an electrode body and a current collector are bonded using an auxiliary member, the bonding can be performed efficiently, and a high-quality power storage element can be provided. it can.

実施の形態における電池の内部構造の概要を示す斜視図である。It is a perspective view which shows the outline | summary of the internal structure of the battery in embodiment. 実施の形態における集電体と電極端子との接続態様を示す図である。It is a figure which shows the connection aspect of the electrical power collector in embodiment, and an electrode terminal. 実施の形態における電極体の構成を示す斜視図である。It is a perspective view which shows the structure of the electrode body in embodiment. 実施の形態における補助部材の概要を示す断面図である。It is sectional drawing which shows the outline | summary of the auxiliary member in embodiment. 実施の形態における補助部材を示す斜視図である。It is a perspective view which shows the auxiliary member in embodiment. 実施の形態における補助部材の取付工程の一例を示す図である。It is a figure which shows an example of the attachment process of the auxiliary member in embodiment. 実施の形態の変形例1における補助部材を示す図である。It is a figure which shows the auxiliary member in the modification 1 of embodiment. 実施の形態の変形例2における補助部材を示す図である。It is a figure which shows the auxiliary member in the modification 2 of embodiment. 実施の形態の変形例3における補助部材を示す図である。It is a figure which shows the auxiliary member in the modification 3 of embodiment.

以下、図面を参照しながら、本発明の実施の形態における蓄電素子について説明する。なお、各図は、模式図であり、必ずしも厳密に図示したものではない。   Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Each figure is a schematic diagram and is not necessarily illustrated exactly.

また、以下で説明する実施の形態は、本発明の一具体例を示すものである。以下の実施の形態で示される数値、形状、材料、構成要素、構成要素の配置位置及び接続形態、生産工程の順序などは、一例であり、本発明を限定する主旨ではない。また、以下の実施の形態における構成要素のうち、最上位概念を示す独立請求項に記載されていない構成要素については、任意の構成要素として説明される。   The embodiment described below shows a specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, order of production steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

まず、蓄電素子として電池を例に挙げ、図1および図2を用いて、実施の形態における電池10の全般的な説明を行う。   First, a battery is taken as an example of a storage element, and the battery 10 according to the embodiment will be generally described with reference to FIGS. 1 and 2.

図1は、実施の形態における電池10の内部構造の概要を示す斜視図である。つまり、図1は、電池10の内部構造を図示するために、後述する電池容器100の一部の図示が省略された図である。   FIG. 1 is a perspective view showing an outline of the internal structure of battery 10 in the embodiment. That is, FIG. 1 is a diagram in which a part of a battery container 100 described later is omitted in order to illustrate the internal structure of the battery 10.

図2は、実施の形態における集電体140と電極端子300との接続態様を示す図である。   FIG. 2 is a diagram illustrating a connection mode between the current collector 140 and the electrode terminal 300 in the embodiment.

電池10は、電気を充電し、また、電気を放電することのできる二次電池であり、例えば、非水電解質二次電池である。非水電解質電池としては、例えば、正極活物質がコバルト酸リチウムなどのリチウム遷移金属酸化物であり、負極活物質が炭素材料であるリチウムイオン二次電池を挙げることができる。   The battery 10 is a secondary battery that can charge and discharge electricity, for example, a non-aqueous electrolyte secondary battery. Examples of the non-aqueous electrolyte battery include a lithium ion secondary battery in which the positive electrode active material is a lithium transition metal oxide such as lithium cobaltate and the negative electrode active material is a carbon material.

なお、電池10の種類は、非水電解質二次電池には限定されず、非水電解質二次電池以外の二次電池であってもよく、また、一次電池であってもよい。また、電池10が、蓄電素子である、リチウムイオンキャパシタ等のキャパシタであってもよい。   The type of the battery 10 is not limited to the nonaqueous electrolyte secondary battery, and may be a secondary battery other than the nonaqueous electrolyte secondary battery, or may be a primary battery. Moreover, the battery 10 may be a capacitor such as a lithium ion capacitor, which is a power storage element.

図1に示すように、実施の形態における電池10は、電池容器100と、電極端子200と、電極端子300とを備える。本実施の形態では、電極端子200は正極の端子であり、電極端子300は負極の端子である。   As shown in FIG. 1, the battery 10 in the embodiment includes a battery container 100, an electrode terminal 200, and an electrode terminal 300. In the present embodiment, the electrode terminal 200 is a positive terminal, and the electrode terminal 300 is a negative terminal.

電池容器100は、金属からなる矩形筒状で底を備える本体101と、本体101の開口を閉塞する金属製の蓋板110とで構成されている。また、電池容器100は、電極体120等を内部に収容後、蓋板110と本体101とが溶接等されることにより、内部を密封する構造を有する。   The battery container 100 includes a main body 101 having a rectangular cylindrical shape made of metal and having a bottom, and a metal lid plate 110 that closes an opening of the main body 101. In addition, the battery container 100 has a structure in which after the electrode body 120 and the like are accommodated therein, the lid plate 110 and the main body 101 are welded to seal the inside.

また、電極端子200は、電池容器100の気密性を保つためのパッキン230を介して電池容器100の蓋板110に取り付けられている。電極端子300も同様にパッキン330を介して電池容器100の蓋板110に取り付けられている。   Further, the electrode terminal 200 is attached to the lid plate 110 of the battery container 100 via a packing 230 for maintaining the airtightness of the battery container 100. Similarly, the electrode terminal 300 is also attached to the lid plate 110 of the battery case 100 via the packing 330.

なお、パッキン230および330のそれぞれは、例えば絶縁性の樹脂で形成されており、金属製の電極端子200および300と、金属製の電池容器100(蓋板110)との間の電気的な絶縁の役割も有している。   Each of the packings 230 and 330 is made of, for example, an insulating resin, and electrically insulates between the metal electrode terminals 200 and 300 and the metal battery container 100 (cover plate 110). It also has a role.

また、図1に示すように、電池容器100の内方には、電極体120が収容されており、さらに、正極側の集電体130と、負極側の集電体140とが配置されている。なお、電池10の電池容器100の内部には電解液などの液体が封入される場合があるが、当該液体の図示は省略する。   As shown in FIG. 1, an electrode body 120 is accommodated inside the battery container 100, and a positive current collector 130 and a negative current collector 140 are disposed. Yes. In addition, although liquid, such as electrolyte solution, may be enclosed in the battery container 100 of the battery 10, illustration of the liquid is omitted.

また、図1には表されていないが、集電体130および集電体140のそれぞれと、蓋板110との間にも、集電体130および集電体140と、蓋板110とを絶縁するパッキン(下パッキン)が配置されている。   Although not shown in FIG. 1, the current collector 130, the current collector 140, and the lid plate 110 are also interposed between the current collector 130 and the current collector 140 and the lid plate 110. An insulating packing (lower packing) is arranged.

電極体120は、正極と負極とセパレータとを備え、電気を蓄えることができる部材であり、全体が長円形状となるように形成されている。電極体120の詳細については、図3を用いて後述する。   The electrode body 120 includes a positive electrode, a negative electrode, and a separator, and is a member that can store electricity, and is formed to have an oval shape as a whole. Details of the electrode body 120 will be described later with reference to FIG.

集電体130は、電極端子200および電極体120に接続された金属部材である。集電体130の素材としては、例えば、電極体120の正極と同じ素材であるアルミニウム、または、アルミニウム合金が採用される。集電体130は、電極体120と接合される一対の長尺状の接続板部132を有している。   The current collector 130 is a metal member connected to the electrode terminal 200 and the electrode body 120. As the material of the current collector 130, for example, aluminum or aluminum alloy which is the same material as the positive electrode of the electrode body 120 is employed. The current collector 130 has a pair of long connection plate portions 132 joined to the electrode body 120.

集電体140は、電極端子300および電極体120に接続された金属部材である。集電体140の素材としては、例えば、電極体120の負極と同じ素材である銅、または、銅合金が採用される。集電体140は、電極体120と接合される一対の長尺状の接続板部142を有している。   The current collector 140 is a metal member connected to the electrode terminal 300 and the electrode body 120. As a material of the current collector 140, for example, copper or a copper alloy which is the same material as the negative electrode of the electrode body 120 is employed. The current collector 140 has a pair of long connection plate portions 142 joined to the electrode body 120.

本実施の形態の電池10では、接続板部132および接続板部142と、電極体120とは、振動を用いた溶接の一種である超音波溶接によって接合されている。   In the battery 10 of the present embodiment, the connection plate portion 132, the connection plate portion 142, and the electrode body 120 are joined by ultrasonic welding which is a type of welding using vibration.

また、本実施の形態の電池10は、特徴的な構成として、補助部材150を備えている。   Moreover, the battery 10 of the present embodiment includes an auxiliary member 150 as a characteristic configuration.

具体的には、集電体130の一対の接続板部132および集電体140の一対の接続板部142のそれぞれに1つの補助部材150が配置されている。   Specifically, one auxiliary member 150 is disposed on each of the pair of connection plate portions 132 of the current collector 130 and the pair of connection plate portions 142 of the current collector 140.

1つの接続板部142に着目して説明すると、電極体120の負極である積層部123aおよび接続板部142を挟むように、1つの補助部材150が配置されている。   To explain with a focus on one connection plate portion 142, one auxiliary member 150 is arranged so as to sandwich the laminated portion 123a, which is the negative electrode of the electrode body 120, and the connection plate portion 142.

例えば、接続板部142と積層部123aとが補助部材150に挟み込まれた状態で加圧されながら超音波による振動が与えられることで、接続板部142と積層部123aとが接合される。このような作業が接続板部ごとに行われることで、一対の接続板部132それぞれと、積層部122aとが接合され、一対の接続板部142それぞれと、積層部123aとが接合される。   For example, the connection plate part 142 and the laminated part 123a are joined together by applying vibration by ultrasonic waves while being pressed while the connection plate part 142 and the laminated part 123a are sandwiched between the auxiliary members 150. By performing such an operation for each connection plate portion, each of the pair of connection plate portions 132 and the laminated portion 122a are joined, and each of the pair of connection plate portions 142 and the laminated portion 123a are joined.

ここで、補助部材150は、超音波による振動によって、金属箔の層で形成された積層部122a(123a)が損傷しないように補助的に用いられる金属部材である。また、補助部材150は、積層部122a(123a)と、接続板部132(142)との溶接の際に、これらを取りまとめる部材としての役割も有する。   Here, the auxiliary member 150 is a metal member that is used in an auxiliary manner so that the laminated portion 122a (123a) formed of the metal foil layer is not damaged by vibration caused by ultrasonic waves. In addition, the auxiliary member 150 also has a role as a member for bringing the laminated portion 122a (123a) and the connecting plate portion 132 (142) together.

なお、正極側の集電体130に取り付けられる補助部材150の素材としては、例えば、電極体120の正極と同じ素材であるアルミニウム、または、アルミニウム合金が採用される。また、負極側の集電体140に取り付けられる補助部材150の素材としては、例えば、電極体120の負極と同じ素材である銅、または、銅合金が採用される。   As the material of the auxiliary member 150 attached to the positive electrode side current collector 130, for example, aluminum or aluminum alloy which is the same material as the positive electrode of the electrode body 120 is employed. In addition, as the material of the auxiliary member 150 attached to the negative electrode side current collector 140, for example, copper or a copper alloy which is the same material as the negative electrode of the electrode body 120 is employed.

この補助部材150の詳細およびその変形例については、図4〜図9を用いて後述する。   Details of the auxiliary member 150 and its modifications will be described later with reference to FIGS.

また、電極端子200(300)と集電体130(140)とは、本実施の形態では、かしめによって接続されている。   In addition, the electrode terminal 200 (300) and the current collector 130 (140) are connected by caulking in this embodiment.

例えば、図2に示すように、電極端子300はリベット部305を有している。このリベット部305が、パッキン330、蓋板110(図1参照)、および、図示しない下パッキンを貫通し、集電体140の、電極接続部141に設けられた貫通孔141aに挿入された状態で、リベット部305の先端がかしめられる。これにより、電極端子300と集電体140とが接続される。   For example, as shown in FIG. 2, the electrode terminal 300 has a rivet portion 305. The rivet portion 305 passes through the packing 330, the cover plate 110 (see FIG. 1), and the lower packing (not shown), and is inserted into the through-hole 141a provided in the electrode connection portion 141 of the current collector 140. Thus, the tip of the rivet portion 305 is caulked. Thereby, the electrode terminal 300 and the collector 140 are connected.

電極端子200も同様に、電極端子200が有するリベット部がかしめられることで、集電体130と接続されている。   Similarly, the electrode terminal 200 is connected to the current collector 130 by caulking a rivet portion of the electrode terminal 200.

次に、図3を用いて、実施の形態における電極体120の構成について説明する。   Next, the configuration of the electrode body 120 in the embodiment will be described with reference to FIG.

図3は、実施の形態における電極体120の構成を示す斜視図である。   FIG. 3 is a perspective view showing a configuration of the electrode body 120 in the embodiment.

電極体120は、図3に示すように、正極122および負極123と、2枚のセパレータ124、125とが交互に積層されるように捲回されることで形成されている。   As shown in FIG. 3, the electrode body 120 is formed by winding the positive electrode 122 and the negative electrode 123 and the two separators 124 and 125 so as to be alternately stacked.

つまり、電極体120は、正極122と、セパレータ124と、負極123と、セパレータ125とがこの順に積層され、かつ、断面が長円形状になるように捲回されることで形成されている。   That is, the electrode body 120 is formed by laminating the positive electrode 122, the separator 124, the negative electrode 123, and the separator 125 in this order, and winding the cross section into an oval shape.

正極122は、アルミニウムからなる長尺帯状の金属箔の表面に、正極活物質を含む合剤層が形成されたものである。   The positive electrode 122 is obtained by forming a mixture layer containing a positive electrode active material on the surface of a long metal foil made of aluminum.

正極122が有する合剤層に含まれる正極活物質としては、例えば、LiMPO、LiMSiO、LiMBO(Mは、Fe、Ni、Mn、Co等から選択される1種または2種以上の遷移金属元素)等のポリアニオン化合物、チタン酸リチウム、マンガン酸リチウム等のスピネル化合物、LiMO(MはFe、Ni、Mn、Co等から選択される1種または2種以上の遷移金属元素)等のリチウム遷移金属酸化物等を用いることができる。 Examples of the positive electrode active material contained in the mixture layer of the positive electrode 122 include LiMPO 4 , LiMSiO 4 , LiMBO 3 (M is one or more transitions selected from Fe, Ni, Mn, Co, etc.) Polyanion compounds such as (metal elements), spinel compounds such as lithium titanate and lithium manganate, LiMO 2 (M is one or more transition metal elements selected from Fe, Ni, Mn, Co, etc.), etc. A lithium transition metal oxide or the like can be used.

負極123は、銅からなる長尺帯状の金属箔の表面に、負極活物質層を含む合剤層が形成されたものである。   The negative electrode 123 is obtained by forming a mixture layer including a negative electrode active material layer on the surface of a long strip-shaped metal foil made of copper.

負極123が有する合剤層に含まれる負極活物質としては、例えばリチウムイオンを吸蔵放出可能な負極活物質であれば、適宜公知の材料を使用できる。例えば、リチウム金属、リチウム合金(リチウム−アルミニウム、リチウム−シリコン、リチウム−鉛、リチウム−錫、リチウム−アルミニウム−錫、リチウム−ガリウム、およびウッド合金等のリチウム金属含有合金)の他、リチウムを吸蔵・放出可能な合金、炭素材料(例えば黒鉛、難黒鉛化炭素、易黒鉛化炭素、低温焼成炭素、非晶質カーボン等)、金属酸化物、リチウム金属酸化物(LiTi12等)、ポリリン酸化合物などが挙げられる。 As the negative electrode active material contained in the mixture layer of the negative electrode 123, for example, any known material can be used as long as it is a negative electrode active material capable of occluding and releasing lithium ions. For example, lithium is occluded in addition to lithium metal and lithium alloys (lithium-containing alloys such as lithium-aluminum, lithium-silicon, lithium-lead, lithium-tin, lithium-aluminum-tin, lithium-gallium, and wood alloys).・ Releasable alloys, carbon materials (eg, graphite, non-graphitizable carbon, graphitizable carbon, low-temperature calcined carbon, amorphous carbon, etc.), metal oxides, lithium metal oxides (Li 4 Ti 6 O 12 etc.) And polyphosphoric acid compounds.

このように構成された電極体120において、より具体的には、正極122と負極123とは、セパレータ124、125を介し、捲回軸(本実施の形態ではX軸方向に平行な仮想軸)の方向に互いにずらして捲回されている。   In the electrode body 120 configured as described above, more specifically, the positive electrode 122 and the negative electrode 123 are wound through the separators 124 and 125 (in this embodiment, a virtual axis parallel to the X-axis direction). It is wound in a direction shifted from each other.

そして、正極122および負極123は、それぞれのずらされた方向の端縁部に、活物質を含む合剤層が形成されていない部分(合剤層非形成部)を有する。   And the positive electrode 122 and the negative electrode 123 have the part (mixture layer non-formation part) in which the mixture layer containing an active material is not formed in the edge part of each shifted direction.

具体的には、正極122は、捲回軸方向の一端に、合剤層が形成されていない合剤層非形成部が積層された積層部122aを有している。また、負極123は、捲回軸方向の他端に、合剤層が形成されていない合剤層非形成部が積層された積層部123aを有している。   Specifically, the positive electrode 122 has a stacked portion 122a in which a mixture layer non-formed portion where a mixture layer is not formed is stacked at one end in the winding axis direction. Moreover, the negative electrode 123 has a laminated portion 123a in which a mixture layer non-formation portion in which no mixture layer is formed is laminated on the other end in the winding axis direction.

つまり、正極122の露出した金属箔の層によって積層部122aが形成され、負極123の露出した金属箔の層によって積層部123aが形成されている。   That is, the laminated portion 122 a is formed by the exposed metal foil layer of the positive electrode 122, and the laminated portion 123 a is formed by the exposed metal foil layer of the negative electrode 123.

このように、電極体120の捲回軸方向の両端部のうちの一方は積層部122aを有し、他方は積層部123aを有する。   Thus, one of the end portions of the electrode body 120 in the winding axis direction has the laminated portion 122a, and the other has the laminated portion 123a.

集電体130は、一対の接続板部132の間に積層部122aが配置された状態で、これら接続板部132と積層部122aとが超音波溶接によって接合されることで、電極体120の正極122と接続される。   In the state in which the laminated portion 122a is disposed between the pair of connecting plate portions 132, the current collector 130 is joined to the connecting plate portion 132 and the laminated portion 122a by ultrasonic welding, thereby Connected to the positive electrode 122.

また、集電体140は、一対の接続板部142の間に積層部123aが配置された状態で、これら接続板部142と積層部122aとが超音波溶接によって接合されることで、電極体120の正極122と接続される。   In addition, the current collector 140 is joined to the electrode plate body by ultrasonic welding of the connection plate portion 142 and the lamination portion 122a in a state where the lamination portion 123a is disposed between the pair of connection plate portions 142. The positive electrode 122 of 120 is connected.

ここで、集電体130および140と電極体120との超音波溶接の工程において補助的な役目を果たす補助部材150は、補助部材150の構造的な特徴により、接続板部(132または142)に対する位置ずれが抑制される。その結果、例えば、超音波溶接の工程における補助部材150と電極体120との干渉の発生が抑制される。   Here, the auxiliary member 150, which plays an auxiliary role in the ultrasonic welding process between the current collectors 130 and 140 and the electrode body 120, has a connecting plate portion (132 or 142) depending on the structural characteristics of the auxiliary member 150. The positional deviation with respect to is suppressed. As a result, for example, the occurrence of interference between the auxiliary member 150 and the electrode body 120 in the ultrasonic welding process is suppressed.

以下、図4および図5を用いて、実施の形態における補助部材150の特徴等について説明する。   Hereinafter, the features and the like of the auxiliary member 150 in the embodiment will be described with reference to FIGS. 4 and 5.

なお、本実施の形態では、負極側の部材(電極端子300、集電体140および補助部材150等)と、正極側の部材(電極端子200、集電体130および補助部材150等)の形状および取り付け構造等は、実質的に同一である。そのため、以下では、主として、負極側の部材に関する事項について説明し、正極側の部材に関する事項についてはその説明を適宜省略する。   In the present embodiment, the negative electrode side members (electrode terminal 300, current collector 140, auxiliary member 150, etc.) and the positive electrode side members (electrode terminal 200, current collector 130, auxiliary member 150, etc.) are shaped. The mounting structure and the like are substantially the same. Therefore, below, the matter regarding the member on the negative electrode side is mainly demonstrated, and the description about the matter regarding the member on the positive electrode side is abbreviate | omitted suitably.

図4には、図1におけるAの部分の、接続板部142の長手方向(本実施の形態におけるZ軸方向、以下同じ)に直交する断面が模式的に示されている。   FIG. 4 schematically shows a cross section orthogonal to the longitudinal direction of the connection plate portion 142 (the Z-axis direction in the present embodiment, the same applies hereinafter) of the portion A in FIG.

また、図5では、接続板部142および積層部123aに取り付けられた状態の補助部材150を表しており、かつ、接続板部142および積層部123aの図示は省略されている。   Further, FIG. 5 shows the auxiliary member 150 attached to the connection plate portion 142 and the laminated portion 123a, and the illustration of the connection plate portion 142 and the laminated portion 123a is omitted.

また、図4および図5では、補助部材150の特徴の明確化のために、接続板部142と積層部123aとの接合時における加振および加圧等に起因する変形は表されていない。このことは、後述する各変形例を示す図7〜図9においても同じである。   4 and 5, in order to clarify the characteristics of the auxiliary member 150, deformation caused by vibration, pressurization, or the like at the time of joining the connection plate portion 142 and the laminated portion 123 a is not shown. This is the same also in FIGS. 7 to 9 showing modifications described later.

図4および図5に示すように、本実施の形態における補助部材150は、少なくとも電極体120の端部と、接続板部142の外側の端面である外端面146とを囲むように配置された部材である。また、補助部材150は、接続板部142の外端面146に対向する面から接続板部142の方向に突出状に設けられる突出部155を有する。   As shown in FIG. 4 and FIG. 5, the auxiliary member 150 in the present embodiment is disposed so as to surround at least the end portion of the electrode body 120 and the outer end surface 146 that is the outer end surface of the connection plate portion 142. It is a member. Further, the auxiliary member 150 has a protruding portion 155 that is provided in a protruding shape in the direction of the connecting plate portion 142 from the surface facing the outer end surface 146 of the connecting plate portion 142.

具体的には、本実施の形態における補助部材150は、電極体120の積層部123aと接合された第一片部151と、接続板部142と接合された第二片部152とを有する。第二片部152は、接続板部142の内端面145に沿った方向に曲げられた折返し部153を有する。   Specifically, the auxiliary member 150 in the present embodiment has a first piece portion 151 joined to the laminated portion 123 a of the electrode body 120 and a second piece portion 152 joined to the connection plate portion 142. The second piece 152 has a folded portion 153 that is bent in a direction along the inner end surface 145 of the connection plate portion 142.

補助部材150はさらに、接続板部142の外端面146に沿って設けられ、第一片部151と第二片部152とを接続する接続片部154とを有する。突出部155は、補助部材150における、接続板部142の外端面146に対向する面である、接続片部154の内面から接続板部142の方向に突出状に設けられている。   The auxiliary member 150 further includes a connection piece 154 that is provided along the outer end surface 146 of the connection plate 142 and connects the first piece 151 and the second piece 152. The protruding portion 155 is provided so as to protrude in the direction of the connecting plate portion 142 from the inner surface of the connecting piece portion 154 that is the surface of the auxiliary member 150 that faces the outer end surface 146 of the connecting plate portion 142.

突出部155は、本実施の形態では、接続片部154の一部が接続板部142の方向に突出することで形成されており、接続板部142の外端面146に接触している。このような態様の突出部155は、例えば、接続片部154に絞り加工又はプレス加工を行うことで形成される。   In the present embodiment, the protruding portion 155 is formed by a part of the connecting piece portion 154 protruding in the direction of the connecting plate portion 142 and is in contact with the outer end surface 146 of the connecting plate portion 142. The protruding portion 155 having such an aspect is formed by, for example, drawing or pressing the connection piece 154.

接続板部142は、厚み方向(本実施の形態におけるY軸方向、以下同じ)の両側面である第一接合面143および第二接合面144と、幅方向(本実施の形態におけるX軸方向、以下同じ)の両端面である内端面145および外端面146とを有する。   The connecting plate portion 142 includes a first bonding surface 143 and a second bonding surface 144 that are both side surfaces in the thickness direction (Y-axis direction in the present embodiment, the same applies hereinafter), and a width direction (X-axis direction in the present embodiment). , The same shall apply hereinafter) and an inner end surface 145 and an outer end surface 146.

第一接合面143は、積層部123aと接合された側面であり、第二接合面144は、補助部材150の第二片部152と接合された側面である。   The first bonding surface 143 is a side surface bonded to the stacked portion 123 a, and the second bonding surface 144 is a side surface bonded to the second piece portion 152 of the auxiliary member 150.

また、内端面145は、この補助部材150が接合された積層部123aとは逆極側、つまり、積層部122aの側の端面であり、補助部材150の折返し部153と当接することで、折返し部153を係止する端面である。   The inner end surface 145 is an end surface opposite to the laminated portion 123a to which the auxiliary member 150 is joined, that is, the end surface on the laminated portion 122a side, and is turned back by contacting the folded portion 153 of the auxiliary member 150. It is an end face for locking the portion 153.

外端面146は、内端面145と反対側の端面であり、補助部材150の突出部155が接触する端面である。   The outer end surface 146 is an end surface opposite to the inner end surface 145, and is an end surface with which the protruding portion 155 of the auxiliary member 150 contacts.

本実施の形態の補助部材150は、上記構成を有することにより、電極体120の積層部123aおよび接続板部142を挟んだ状態において、接続板部142を幅方向から押圧しながら挟むことができる。   The auxiliary member 150 according to the present embodiment has the above-described configuration, and can sandwich the connection plate 142 while pressing the connection plate 142 from the width direction in a state where the stacked portion 123a and the connection plate 142 of the electrode body 120 are sandwiched. .

具体的には、補助部材150の折返し部153が接続板部142の内端面145に係止され、かつ、接続板部142の外端面146に、接続片部154の内面から突出状に設けられた突出部155が接触する。   Specifically, the folded portion 153 of the auxiliary member 150 is locked to the inner end surface 145 of the connection plate portion 142, and is provided on the outer end surface 146 of the connection plate portion 142 so as to protrude from the inner surface of the connection piece portion 154. The protruding portion 155 contacts.

すなわち、補助部材150は、自身が有する弾性により、接続板部142の外端面146に付勢力を与える構造、言い換えると、折返し部153と突出部155とで接続板部142を幅方向から挟み込む構造を有している。これにより、積層部123aと接続板部142との超音波溶接等による接合時またはその接合の前の準備の際において、補助部材150の位置の安定性が向上する。   That is, the auxiliary member 150 has a structure that applies an urging force to the outer end surface 146 of the connection plate part 142 due to its own elasticity, in other words, a structure in which the connection plate part 142 is sandwiched between the folded portion 153 and the protruding portion 155 from the width direction. have. Thereby, the stability of the position of the auxiliary member 150 is improved at the time of joining by the ultrasonic welding or the like between the laminated portion 123a and the connecting plate portion 142 or at the time of preparation before the joining.

ここで、補助部材150の接続板部142への取り付けの際に、突出部155を接続板部142の外端面146に押し当てるように取り付けることで、補助部材150が有する弾性を、補助部材150の位置の安定に効果的に利用することができる。   Here, when attaching the auxiliary member 150 to the connection plate portion 142, the protrusion 155 is attached so as to press against the outer end surface 146 of the connection plate portion 142, whereby the elasticity of the auxiliary member 150 is increased. Can be effectively used for the stability of the position.

なお、本実施の形態の電池10の製造方法は、取付工程と接合工程とを含むが、当該製造方法における特徴的な手順を含む取付工程について、図6を参照しながら以下に説明する。   In addition, although the manufacturing method of the battery 10 of this Embodiment contains an attachment process and a joining process, the attachment process including the characteristic procedure in the said manufacturing method is demonstrated below, referring FIG.

本実施の形態における取付工程は、配置工程と、折り曲げ工程とを含む。より具体的には、配置工程の前に加工工程が行われる。   The attachment process in the present embodiment includes an arrangement process and a bending process. More specifically, the processing step is performed before the placement step.

加工工程では、補助部材150を構成する金属製の板材159に対し、板材159の端縁を折り曲げることによる折返し部153の形成、および、板材159から突出状に設けられた突出部155の形成が行われる。   In the processing step, the folded portion 153 is formed by bending the edge of the plate material 159 with respect to the metal plate material 159 constituting the auxiliary member 150, and the protruding portion 155 provided in a protruding shape from the plate material 159 is formed. Done.

より詳細には、さらに、折返し部153と突出部155との間の所定の位置での折り曲げ加工等がなされ、その結果、板材159は、図6の(a)に示す形状にされる。つまり、板材159は、後の配置工程のための形状に仮成形される。   More specifically, a folding process or the like is performed at a predetermined position between the folded portion 153 and the projecting portion 155, and as a result, the plate member 159 has a shape shown in FIG. That is, the plate material 159 is temporarily formed into a shape for a subsequent arrangement process.

配置工程では、図6の(a)に示す形状に成形された板材159が、折返し部153が接続板部142の内端面145に当接するように配置される。   In the arranging step, the plate member 159 formed in the shape shown in FIG. 6A is arranged such that the folded portion 153 contacts the inner end surface 145 of the connecting plate portion 142.

折り曲げ工程では、折返し部153が接続板部142の内端面145に当接した状態で、突出部155が接続板部142の外端面146に接触し、かつ、板材159が、積層部123aおよび接続板部142を挟むように、板材159が折り曲げられる。   In the bending step, the protruding portion 155 contacts the outer end surface 146 of the connection plate portion 142 in a state where the folded portion 153 is in contact with the inner end surface 145 of the connection plate portion 142, and the plate material 159 is connected to the laminated portion 123a and the connection portion. The plate material 159 is bent so as to sandwich the plate portion 142.

つまり、仮成形された板材159が、図6の(b)に示すように、接続板部142に対して配置される。その後、突出部155を挟んで折返し部153とは反対側の部分が、折り曲げ治具500によって、電極体120の側に押し込まれるようにして折り曲げられる。   That is, the temporarily formed plate material 159 is arranged with respect to the connection plate portion 142 as shown in FIG. Thereafter, the portion opposite to the folded portion 153 across the protruding portion 155 is bent by the bending jig 500 so as to be pushed into the electrode body 120 side.

これにより、図6の(c)に示すように、突出部155が接続板部142の外端面146に押し当てられた状態で、補助部材150が接続板部142および積層部123aを挟むように配置される。   As a result, as shown in FIG. 6C, the auxiliary member 150 sandwiches the connection plate portion 142 and the laminated portion 123 a in a state where the protruding portion 155 is pressed against the outer end surface 146 of the connection plate portion 142. Be placed.

この状態において、折返し部153が接続板部142の内端面145に係止されているため、突出部155からの付勢力が接続板部142の外端面146に与えられる。つまり、補助部材150は接続板部142を幅方向から挟持するように配置される。   In this state, since the folded portion 153 is locked to the inner end surface 145 of the connection plate portion 142, the urging force from the protruding portion 155 is applied to the outer end surface 146 of the connection plate portion 142. That is, the auxiliary member 150 is disposed so as to sandwich the connection plate portion 142 from the width direction.

これにより、補助部材150の位置の安定化が図られ、補助部材150を接続板部142に取り付けた状態において、補助部材150の、接続板部142に対する幅方向の位置ずれが抑制される。   Thereby, the position of the auxiliary member 150 is stabilized, and in the state where the auxiliary member 150 is attached to the connection plate portion 142, the displacement of the auxiliary member 150 with respect to the connection plate portion 142 in the width direction is suppressed.

つまり、超音波溶接等による接合が行われる場所までの移動、および、当該接合の実施に際して、例えば補助部材150を接続板部142に固定するための治具の配置が不要であり、これにより、当該接合を効率よく行うことができる。   That is, when moving to a place where joining by ultrasonic welding or the like is performed, and when performing the joining, for example, it is not necessary to arrange a jig for fixing the auxiliary member 150 to the connection plate portion 142. The joining can be performed efficiently.

本実施の形態における接合工程は、上記の取付工程の後に行われる工程であり、補助部材150に挟まれた状態の積層部123aと接続板部142とを接合する工程である。   The joining process in the present embodiment is a process performed after the attachment process, and is a process for joining the laminated portion 123a and the connection plate portion 142 in a state of being sandwiched between the auxiliary members 150.

例えば、補助部材150、第一片部151の外面に、ホーンが当てられ、補助部材150の第二片部152の外面に、アンビルが当てられる。   For example, a horn is applied to the outer surface of the auxiliary member 150 and the first piece 151, and an anvil is applied to the outer surface of the second piece 152 of the auxiliary member 150.

この状態で、ホーンおよびアンビルによって加圧されながら、ホーンからの超音波振動が与えられ、その結果、積層部123aと接続板部142とが接合される。なお、このとき、第一片部151と積層部123aとが接合され、第二片部152と接続板部142とが接合される。   In this state, ultrasonic vibration from the horn is applied while being pressurized by the horn and the anvil, and as a result, the laminated portion 123a and the connecting plate portion 142 are joined. At this time, the first piece 151 and the laminated portion 123a are joined, and the second piece 152 and the connecting plate portion 142 are joined.

ここで、仮に補助部材150に突出部155がない場合を想定した場合、図6の(b)に示す状態おいて、折り曲げ治具500で板材159を強く押し込んだとしても、接続片部154と、接続板部142の外端面146との間の隙間をゼロにするのは困難である。   Here, if it is assumed that the auxiliary member 150 does not have the protruding portion 155, even if the plate material 159 is strongly pressed by the bending jig 500 in the state shown in FIG. It is difficult to make the gap between the connecting plate portion 142 and the outer end surface 146 zero.

そのため、突出部155がない補助部材150は、接続板部142に対する、幅方向の移動(ずれ)が生じ易いといえる。つまり、当該補助部材150が、接合工程において電極体120の方向(図6の(c)における左方向)に移動した場合、当該補助部材150の端部(例えば図6の(c)における折返し部153の上端、または、第一片部151における左端)が、電極体120に干渉することが考えられる。この場合、微小な金属片等の異物の発生も想定され得る。このような金属片の発生は、電極体120における内部短絡の発生の要因ともなり得る。   Therefore, it can be said that the auxiliary member 150 without the protruding portion 155 is likely to move (displace) in the width direction with respect to the connecting plate portion 142. That is, when the auxiliary member 150 moves in the joining process in the direction of the electrode body 120 (left direction in FIG. 6C), the end of the auxiliary member 150 (for example, the folded portion in FIG. 6C). It is conceivable that the upper end of 153 or the left end of the first piece 151 interferes with the electrode body 120. In this case, the generation of foreign matters such as minute metal pieces can be assumed. The occurrence of such metal pieces can also be a cause of the occurrence of an internal short circuit in the electrode body 120.

しかしながら、本実施の形態の補助部材150は、突出部155が、接続板部142の電極体120とは反対側の端面(外端面146)に付勢力を与える状態で、接続板部142に取り付けられている。そのため、補助部材150の、接続板部142の幅方向の移動(ずれ)が抑制される。   However, the auxiliary member 150 according to the present embodiment is attached to the connection plate 142 in a state where the protruding portion 155 applies a biasing force to the end surface (outer end surface 146) opposite to the electrode body 120 of the connection plate 142. It has been. Therefore, the movement (shift) of the auxiliary member 150 in the width direction of the connection plate portion 142 is suppressed.

つまり、補助部材150に、超音波溶接等における圧力および振動が加えられた場合において、補助部材150が移動することによる、電極体120との干渉が抑制される。   That is, when pressure and vibration in ultrasonic welding or the like are applied to the auxiliary member 150, interference with the electrode body 120 due to movement of the auxiliary member 150 is suppressed.

これにより、補助部材150と電極体120とが干渉することによる異物の発生が抑制され、その結果、品質の高い電池10の提供が可能となる。   Thereby, generation | occurrence | production of the foreign material by interference with the auxiliary member 150 and the electrode body 120 is suppressed, As a result, provision of the battery 10 with high quality is attained.

なお、図5に示す形状に形成された補助部材150を、積層部123aと接続板部142とを挟むように配置してもよい。つまり、仮成形(図6の(a)参照)を経ずに、取付時の状態とほぼ同じ形状にまで加工された板材159を、接続板部142に取り付けてもよい。   In addition, you may arrange | position the auxiliary member 150 formed in the shape shown in FIG. 5 so that the lamination | stacking part 123a and the connection board part 142 may be pinched | interposed. That is, the plate member 159 processed to the same shape as the state at the time of attachment may be attached to the connection plate portion 142 without going through temporary forming (see FIG. 6A).

この場合、補助部材150の、接続板部142への取り付けの前の状態において、折返し部153と突出部155との間の幅方向の距離を、接続板部142の幅(X軸方向の長さ)より短くなるように、補助部材150を作製する。これにより、突出部155と接続板部142との接触が保障され、補助部材150が有する弾性を補助部材150の位置の安定に効果的に利用することができる。   In this case, in the state before the auxiliary member 150 is attached to the connection plate 142, the distance in the width direction between the folded portion 153 and the protrusion 155 is the width of the connection plate 142 (the length in the X-axis direction). A) The auxiliary member 150 is fabricated so as to be shorter. Thereby, the contact between the projecting portion 155 and the connecting plate portion 142 is ensured, and the elasticity of the auxiliary member 150 can be effectively used to stabilize the position of the auxiliary member 150.

なお、電池10は、図4〜図6等に示す補助部材150の形状または構造とは異なる形状または構造の補助部材150を備えてもよい。そこで、以下に、実施の形態における補助部材150に関する各種の変形例を説明する。   The battery 10 may include an auxiliary member 150 having a shape or structure different from the shape or structure of the auxiliary member 150 shown in FIGS. Accordingly, various modifications related to the auxiliary member 150 in the embodiment will be described below.

(変形例1)
図7は、実施の形態の変形例1における補助部材150aを示す図である。図7では、接続板部142および積層部123aの図示は省略されている。
(Modification 1)
FIG. 7 is a diagram illustrating an auxiliary member 150a according to the first modification of the embodiment. In FIG. 7, the connection plate portion 142 and the laminated portion 123a are not shown.

図7の(a)に示すように、変形例1における補助部材150aは、接続板部142の長手方向に沿って複数配置された突出部155aを有している。   As shown in FIG. 7A, the auxiliary member 150 a in Modification 1 has a plurality of protruding portions 155 a arranged along the longitudinal direction of the connecting plate portion 142.

つまり、上記実施の形態に係る補助部材150は、例えば図5に示すように、1つの突出部155が接続板部142の長手方向に沿って延設されているのに対し、補助部材150aでは、当該長手方向に沿って離散的に複数の突出部155aが配置されている。   That is, in the auxiliary member 150 according to the above-described embodiment, for example, as illustrated in FIG. 5, one protruding portion 155 extends along the longitudinal direction of the connecting plate portion 142, whereas in the auxiliary member 150 a A plurality of protrusions 155a are discretely arranged along the longitudinal direction.

具体的には、本変形例では、図7の(b)(図7の(a)におけるB−B断面の一部)に示されるように、接続片部154に絞り加工を行うことで複数の突出部155aが形成されている。   Specifically, in this modified example, as shown in FIG. 7B (a part of the BB cross section in FIG. 7A), a plurality of pieces are drawn by drawing the connection piece 154. The protruding portion 155a is formed.

なお、図7において突出部155aのそれぞれは、当該長手方向に沿った長尺状であるが、突出部155aの形状に特に限定はない。例えば、半球状、円錐状、または、接続板部142の厚み方向(Y軸方向)に長尺状の突出部として、突出部155aが接続片部154に設けられていてもよい。   In addition, in FIG. 7, each of the protrusion part 155a is elongate along the said longitudinal direction, However There is no limitation in particular in the shape of the protrusion part 155a. For example, the protruding portion 155a may be provided on the connecting piece portion 154 as a protruding portion that is hemispherical, conical, or elongated in the thickness direction (Y-axis direction) of the connecting plate portion 142.

このように、補助部材が有する突出部は、接続板部の長手方向に延設されてもよく、当該長手方向に沿って離散的に複数配置されてもよい。いずれの場合であっても、突出部と接続板部との接触の確実性が向上され、接合前および接合時における補助部材の位置の安定性が向上する。   As described above, the protrusions of the auxiliary member may be extended in the longitudinal direction of the connection plate portion, or may be arranged in a plurality of discrete manners along the longitudinal direction. In any case, the certainty of contact between the protruding portion and the connecting plate portion is improved, and the stability of the position of the auxiliary member before and during joining is improved.

(変形例2)
図8は、実施の形態の変形例2における補助部材150bを示す図である。図8の(a)では、接続板部142および積層部123aの図示は省略されている。
(Modification 2)
FIG. 8 is a diagram illustrating an auxiliary member 150b according to Modification 2 of the embodiment. In FIG. 8A, illustration of the connecting plate portion 142 and the laminated portion 123a is omitted.

図8の(a)に示すように、変形例2に係る補助部材150bは、接続板部142の長手方向に沿って複数配置された突出部155bを有している。   As shown in FIG. 8A, the auxiliary member 150 b according to Modification 2 has a plurality of protruding portions 155 b arranged along the longitudinal direction of the connection plate portion 142.

ここで、変形例2に係る補助部材150bが有する突出部155bは、接続片部154の一部が突出することで形成されている点では、実施の形態に係る突出部155と同じである。   Here, the protrusion 155b included in the auxiliary member 150b according to Modification 2 is the same as the protrusion 155 according to the embodiment in that it is formed by a part of the connection piece 154 protruding.

しかし、変形例2に係る突出部155bは、図8の(a)および(b)に示すように、絞り加工ではなく、接続片部154の一部を切り起こすことで形成されている点で、実施の形態に係る突出部155とは異なる。   However, as shown in FIGS. 8A and 8B, the protruding portion 155b according to the modified example 2 is formed by cutting and raising a part of the connecting piece portion 154 instead of drawing. This is different from the protrusion 155 according to the embodiment.

つまり、接続片部154の一部を突出させることで突出部を形成する場合、その形成の手法は絞りに限定されず、例えば突出部155bのように、切り起こしによって形成されてもよい。   That is, when forming the protruding portion by protruding a part of the connecting piece portion 154, the forming method is not limited to the diaphragm, and may be formed by cutting and raising, for example, like the protruding portion 155b.

なお、切り起こしによって突出部155bを形成する場合、例えば図8の(b)に示されるように、突出部155bの、接続板部142と接触する部分を丸めることで、例えば、当該部分を、接続板部142に対して厚み方向に滑りやすくすることができる。これにより、補助部材150が有する弾性を、より効果的に補助部材150の位置の安定に利用することができる。   In addition, when forming the protruding portion 155b by cutting and raising, for example, as shown in FIG. 8B, by rounding the portion of the protruding portion 155b that contacts the connecting plate portion 142, for example, the portion It is possible to make the connecting plate portion 142 slip easily in the thickness direction. Thereby, the elasticity which auxiliary member 150 has can be used for stability of the position of auxiliary member 150 more effectively.

なお、突出部155bの形状に特に限定はなく、例えば、接続板部142の厚み方向(Y軸方向)に長尺状の突出部として、突出部155aが接続片部154に設けられていてもよい。   The shape of the protruding portion 155b is not particularly limited. For example, the protruding portion 155a may be provided on the connecting piece portion 154 as a long protruding portion in the thickness direction (Y-axis direction) of the connecting plate portion 142. Good.

以上、変形例1および2に示すように、突出部を、接続片部154の一部を突出させることで形成する場合において、突出部の数、形状、配置位置、および形成の手法は様々なものが存在する。また、補助部材において、接続板部142の長手方向の全長に渡って突出部が配置されている必要はなく、当該全長の少なくとも一部に突出部が配置されていればよい。   As described above, as shown in Modifications 1 and 2, when the protrusion is formed by protruding a part of the connection piece 154, the number, shape, arrangement position, and formation method of the protrusion are various. Things exist. Further, in the auxiliary member, the protruding portion does not need to be disposed over the entire length of the connection plate portion 142 in the longitudinal direction, and the protruding portion may be disposed at least at a part of the entire length.

(変形例3)
図9は、実施の形態の変形例3における補助部材150cを示す図である。図9の(a)では、接続板部142および積層部123aの図示は省略されている。
(Modification 3)
FIG. 9 is a diagram illustrating an auxiliary member 150c in Modification 3 of the embodiment. In (a) of FIG. 9, illustration of the connecting plate part 142 and the laminated part 123a is omitted.

図9の(a)に示すように、変形例2に係る補助部材150bは、接続板部142の長手方向に沿って延設された突出部155cを有しており、この点では、実施の形態に係る突出部155と同じである。   As shown in FIG. 9A, the auxiliary member 150b according to the modified example 2 has a protruding portion 155c that extends along the longitudinal direction of the connecting plate portion 142. It is the same as the protrusion part 155 which concerns on a form.

しかし、図9の(a)および(b)に示すように、変形例3に係る突出部155cは、接続片部154の内面と接続板部142の外端面146との間に挟まれた、接続片部154とは別体の部材によって形成されている点で、実施の形態に係る突出部155とは異なる。   However, as shown in FIGS. 9A and 9B, the protrusion 155c according to the modification 3 is sandwiched between the inner surface of the connection piece 154 and the outer end surface 146 of the connection plate 142. It differs from the protrusion part 155 which concerns on embodiment by the point currently formed with the member separate from the connection piece part 154. FIG.

このような態様の突出部155cは、接続片部154の内面から接続板部142の外端面146の方向に突出状に設けられ、外端面146に接触する突出部の一例である。   The protruding portion 155 c having such an aspect is an example of a protruding portion that protrudes from the inner surface of the connecting piece portion 154 toward the outer end surface 146 of the connecting plate portion 142 and contacts the outer end surface 146.

このように、突出部155cを、補助部材150の本体(第一片部151、第二片部152および接続片部154の一体物)とは別体として作製することで、弾性、剛性、および、耐熱性等が考慮された適切な素材を、突出部155cとして選択することができる。例えば、補助部材150の本体よりも弾性の高い素材で突出部155cを作製することで、補助部材150の位置の安定性をより向上させることも可能となる。   Thus, by producing the protrusion 155c as a separate body from the main body of the auxiliary member 150 (the integrated piece of the first piece 151, the second piece 152, and the connection piece 154), elasticity, rigidity, and An appropriate material considering heat resistance and the like can be selected as the protruding portion 155c. For example, it is possible to further improve the stability of the position of the auxiliary member 150 by making the protruding portion 155c with a material having higher elasticity than the main body of the auxiliary member 150.

突出部155cの素材としては、エポキシ樹脂またはシリコン樹脂等の樹脂が例示される。   Examples of the material of the protruding portion 155c include a resin such as an epoxy resin or a silicon resin.

また、例えば、金属製または樹脂製のパイプを、突出部155cとして、接続片部154と接続板部142の外端面146との間に配置してもよい。この場合、当パイプの周面が、接続板部142の長手方向に沿って切り欠かれていてもよい。このように、突出部155cは中実である必要はなく、中空であってもよい。   In addition, for example, a metal or resin pipe may be disposed between the connection piece 154 and the outer end surface 146 of the connection plate 142 as the protrusion 155c. In this case, the peripheral surface of the pipe may be cut out along the longitudinal direction of the connection plate portion 142. Thus, the protrusion 155c does not need to be solid and may be hollow.

また、突出部155cは、予め形状の定められた部品として実現されなくてもよい。例えば、シリコン樹脂等の樹脂を、接続片部154の内面または接続板部142の外端面146に塗布した後に固化させることで、突出部155cを形成してもよい。   Further, the protruding portion 155c may not be realized as a part having a predetermined shape. For example, the protruding portion 155c may be formed by applying a resin such as silicon resin to the inner surface of the connection piece 154 or the outer end surface 146 of the connection plate portion 142 and then solidifying the resin.

このように、補助部材が備える突出部は、接続片部154と一体である必要はなく、適宜選択した素材で構成された、接続片部154とは別体の要素として配置されてもよい。   Thus, the protrusion provided in the auxiliary member does not need to be integral with the connection piece portion 154, and may be arranged as an element separate from the connection piece portion 154, which is made of an appropriately selected material.

(その他)
以上、本発明に係る電池について、実施の形態およびその変形例に基づいて説明した。しかしながら、本発明は、実施の形態およびその変形例に限定されるものではない。本発明の趣旨を逸脱しない限り、当業者が思いつく各種変形を実施の形態またはその変形例に施したものも、あるいは、上記説明された複数の構成要素を組み合わせて構築される形態も、本発明の範囲内に含まれる。
(Other)
As described above, the battery according to the present invention has been described based on the embodiment and the modifications thereof. However, the present invention is not limited to the embodiment and its modifications. Without departing from the spirit of the present invention, various modifications conceived by those skilled in the art may be applied to the embodiment or its modifications, or a structure constructed by combining a plurality of the above-described constituent elements may be applied to the present invention. It is included in the range.

例えば、実施の形態における補助部材150は、第一片部151、第二片部152および接続片部154それぞれの長さ(接続板部142の長手方向の長さ、以下同じ)は同一(略同一も含む)である。   For example, in the auxiliary member 150 according to the embodiment, the lengths of the first piece portion 151, the second piece portion 152, and the connection piece portion 154 (the length in the longitudinal direction of the connection plate portion 142, hereinafter the same) are the same (substantially). Including the same).

しかし、これら要素の長さは同一である必要はない。例えば、折返し部153を有する第二片部152の長さが、第一片部151および接続片部154の長さよりも短くてもよい。   However, the lengths of these elements need not be the same. For example, the length of the second piece 152 having the folded portion 153 may be shorter than the length of the first piece 151 and the connection piece 154.

この場合、接続片部154の、当該長手方向における第二片部152に対応する位置に、突出部(155、155a、155b、または155c、以下「突出部155等」という)が配置されていればよい。これにより、突出部155等を、接続板部142に対する位置の安定化のための要素として効率よく機能させることができる。   In this case, a protruding portion (155, 155a, 155b, or 155c, hereinafter referred to as “the protruding portion 155 or the like”) is disposed at a position of the connecting piece portion 154 corresponding to the second piece portion 152 in the longitudinal direction. That's fine. Thereby, the protrusion part 155 etc. can be efficiently functioned as an element for stabilizing the position with respect to the connection plate part 142.

また、折返し部153の長さについても、第二片部152の長さと同一である必要はなく、例えば、第二片部152の長さよりも短くてもよい。この場合、接続片部154の当該長手方向における折返し部153に対応する位置に、突出部155等が配置することで、突出部155等を、接続板部142に対する位置の安定化のための要素として効率よく機能させることができる。   Further, the length of the folded portion 153 need not be the same as the length of the second piece 152, and may be shorter than the length of the second piece 152, for example. In this case, the protrusion 155 and the like are arranged at a position corresponding to the folded portion 153 in the longitudinal direction of the connection piece 154, so that the protrusion 155 and the like are elements for stabilizing the position with respect to the connection plate 142. Can function efficiently.

また、補助部材150は、折返し部153を備えなくてもよい。例えば、第一片部151と第二片部152とによる挟持力により、補助部材150が、電極体120の端部(積層部122a)と集電体140の接続板部142とに安定的に取り付けられる場合、折返し部153がなくてもよい。   In addition, the auxiliary member 150 may not include the folded portion 153. For example, due to the clamping force between the first piece 151 and the second piece 152, the auxiliary member 150 is stably attached to the end portion (stacked portion 122 a) of the electrode body 120 and the connection plate portion 142 of the current collector 140. When attached, the folded portion 153 may not be provided.

また、補助部材150は、第二片部152を備えなくてもよい。つまり、補助部材150は、接続板部142の長手方向から見た場合において、少なくとも電極体120の端部(積層部122a)と、接続板部142の外端面146とを囲むように配置されればよい。   Further, the auxiliary member 150 may not include the second piece portion 152. That is, the auxiliary member 150 is disposed so as to surround at least the end portion (stacked portion 122a) of the electrode body 120 and the outer end surface 146 of the connection plate portion 142 when viewed from the longitudinal direction of the connection plate portion 142. That's fine.

すなわち、補助部材150は、積層部122aと接続板部142との超音波溶接等の接合の際の当て材として機能する部分(第一片部151)と、補助部材150の電極体120の方向への移動(ずれ)を抑制するための部分(突出部155)とを備えればよい。   That is, the auxiliary member 150 includes a portion (first piece portion 151) that functions as a contact member when joining the laminated portion 122 a and the connection plate portion 142 such as ultrasonic welding, and the direction of the electrode body 120 of the auxiliary member 150. It is only necessary to include a portion (protruding portion 155) for suppressing movement (displacement).

また、集電体140と電極体120との接合の手法は、超音波溶接に限定されない。例えば、補助部材150に挟まれた状態の積層部123aと接続板部142とを、抵抗溶接で接合してもよい。つまり、補助部材150を、主として、積層部123aと接続板部142とを抵抗溶接で接合する際の、積層部123aと接続板部142とを取りまとめる部材として用いてもよい。   Further, the method of joining the current collector 140 and the electrode body 120 is not limited to ultrasonic welding. For example, the laminated portion 123a and the connection plate portion 142 sandwiched between the auxiliary members 150 may be joined by resistance welding. That is, the auxiliary member 150 may be used mainly as a member for bringing together the laminated portion 123a and the connecting plate portion 142 when the laminated portion 123a and the connecting plate portion 142 are joined by resistance welding.

また、電池10が備える電極体120の構造は捲回型でなくてもよく、平板状の正極と負極とがセパレータを挟んで交互に積層された構造であってもよい。また、電極体120は、長尺帯状の正極と負極とがセパレータを挟んで蛇腹状に折り畳まれた構造であってもよい。   The structure of the electrode body 120 included in the battery 10 may not be a wound type, and may be a structure in which flat positive electrodes and negative electrodes are alternately stacked with a separator interposed therebetween. Further, the electrode body 120 may have a structure in which a long belt-like positive electrode and a negative electrode are folded in a bellows shape with a separator interposed therebetween.

つまり、電極体120の構造として、集電体130または140と接合可能な端部を有する構造であれば、どのような構造が採用されてもよい。   That is, any structure may be adopted as the structure of the electrode body 120 as long as it has an end portion that can be joined to the current collector 130 or 140.

また、集電体140は、一対の接続板部142を有するとしたが、集電体140は、少なくとも1つの接続板部142を有すればよい。集電体130も同様に、少なくとも1つの接続板部132を有すればよい。   Further, although the current collector 140 has a pair of connection plate portions 142, the current collector 140 only needs to have at least one connection plate portion 142. Similarly, the current collector 130 may have at least one connection plate portion 132.

また、電池10において、正極側および負極側の双方に補助部材150が配置されるとしたが、補助部材150は正極側および負極側のいずれか一方にのみ配置されていてもよい。   In the battery 10, the auxiliary member 150 is arranged on both the positive electrode side and the negative electrode side. However, the auxiliary member 150 may be arranged only on either the positive electrode side or the negative electrode side.

例えば、比較的に微小な金属片が発生し易い銅を素材とする、負極側の集電体140と、電極体120の積層部123aとを接合する箇所にのみ補助部材150が配置されていてもよい。   For example, the auxiliary member 150 is disposed only at a location where the negative electrode side current collector 140 and the laminated portion 123a of the electrode body 120 are joined to each other, which is made of copper, in which relatively small metal pieces are easily generated. Also good.

本発明は、電極体と集電体とが補助部材に挟まれた状態で接合される蓄電素子であって、当該接合を効率よく行うことができ、かつ、品質の高い蓄電素子を提供することができる。従って、本発明に係る蓄電素子は、大電流を長時間必要とする自動車等に搭載される電池として有用である。   The present invention provides a power storage element that is joined in a state in which an electrode body and a current collector are sandwiched between auxiliary members, the joining can be performed efficiently, and a high-quality power storage element is provided. Can do. Therefore, the electricity storage device according to the present invention is useful as a battery mounted in an automobile or the like that requires a large current for a long time.

10 電池
100 電池容器
101 本体
110 蓋板
120 電極体
122 正極
122a、123a 積層部
123 負極
124、125 セパレータ
130、140 集電体
132、142 接続板部
141 電極接続部
141a 貫通孔
143 第一接合面
144 第二接合面
145 内端面
146 外端面
150、150a、150b、150c 補助部材
151 第一片部
152 第二片部
153 折返し部
154 接続片部
155、155a、155b、155c 突出部
159 板材
200、300 電極端子
230、330 パッキン
305 リベット部
500 折り曲げ治具
DESCRIPTION OF SYMBOLS 10 Battery 100 Battery container 101 Main body 110 Cover plate 120 Electrode body 122 Positive electrode 122a, 123a Laminated part 123 Negative electrode 124, 125 Separator 130, 140 Current collector 132, 142 Connection plate part 141 Electrode connection part 141a Through-hole 143 First joint surface 144 Second joint surface 145 Inner end surface 146 Outer end surface 150, 150a, 150b, 150c Auxiliary member 151 First piece portion 152 Second piece portion 153 Turned portion 154 Connection piece portion 155, 155a, 155b, 155c Protruding portion 159 Plate material 200, 300 Electrode terminal 230, 330 Packing 305 Rivet part 500 Bending jig

Claims (6)

電極体と、前記電極体の端部に接合された接続板部を有する集電体と、少なくとも前記電極体の前記端部と、前記接続板部の外側の端面である外端面とを囲むように配置された補助部材とを備え、
前記補助部材は、前記接続板部の前記外端面に対向する面から前記接続板部の方向に突出状に設けられる突出部を有する
蓄電素子。
Surrounding an electrode body, a current collector having a connection plate joined to an end of the electrode body, at least the end of the electrode body, and an outer end surface that is an outer end face of the connection plate An auxiliary member arranged in the
The auxiliary member has a protruding portion provided in a protruding shape in a direction from the surface facing the outer end surface of the connection plate portion toward the connection plate portion.
前記補助部材は、前記電極体の前記端部と接合された第一片部と、前記接続板部と接続された第二片部と、前記第一片部および前記第二片部を接続する接続片部とを有し、
前記突出部は、前記補助部材における、前記接続板部の前記外端面に対向する面である、前記接続片部の内面から前記接続板部の方向に突出状に設けられている
請求項1記載の蓄電素子。
The auxiliary member connects the first piece joined to the end of the electrode body, the second piece connected to the connection plate, and the first piece and the second piece. A connecting piece,
The said protrusion part is provided in the shape which protrudes in the direction of the said connection plate part from the inner surface of the said connection piece part which is a surface which opposes the said outer end surface of the said connection plate part in the said auxiliary member. Power storage element.
前記第二片部は、前記接続板部の内側の端面である内端面に沿った方向に曲げられた折返し部を有する
請求項2記載の蓄電素子。
The power storage device according to claim 2, wherein the second piece portion has a folded portion bent in a direction along an inner end surface that is an inner end surface of the connection plate portion.
前記突出部は、前記接続板部の前記外端面に接触している
請求項1〜3のいずれか1項に記載の蓄電素子。
The power storage element according to claim 1, wherein the protruding portion is in contact with the outer end surface of the connection plate portion.
前記突出部は、前記補助部材の一部が前記接続板部の方向に突出することで形成されている
請求項1〜4のいずれか1項に記載の蓄電素子。
The power storage element according to claim 1, wherein the protruding portion is formed by a part of the auxiliary member protruding in the direction of the connection plate portion.
電極体と、前記電極体の端部に接合された接続板部を有する集電体と、補助部材とを備える蓄電素子の製造方法であって、
前記電極体の前記端部および前記接続板部を挟むように前記補助部材を前記接続板部に取り付ける取付工程と、
前記取付工程の後に、前記補助部材に挟まれた状態の前記電極体の前記端部と前記接続板部とを接合する接合工程とを含み、
前記取付工程は、
前記補助部材を構成する金属製の板材に対し、前記板材の端縁を折り曲げることによって形成された折返し部が、前記接続板部の内側の端面である内端面に当接するように、前記板材を前記接続板部に配置する配置工程と、
前記折返し部が前記接続板部の前記内端面に当接した状態で、前記板材に突出状に設けられた突出部が前記接続板部の外側の端面である外端面に接触し、かつ、前記板材が、前記電極体の前記端部および前記接続板部を挟むように、前記板材を折り曲げる折り曲げ工程とを含む
蓄電素子の製造方法。
A method for producing an electricity storage device comprising an electrode body, a current collector having a connection plate joined to an end of the electrode body, and an auxiliary member,
An attachment step of attaching the auxiliary member to the connection plate portion so as to sandwich the end portion of the electrode body and the connection plate portion;
After the attachment step, including a joining step of joining the end portion of the electrode body and the connection plate portion sandwiched between the auxiliary members,
The attaching step includes
With respect to the metal plate material that constitutes the auxiliary member, the folded plate portion formed by bending the edge of the plate material is brought into contact with the inner end surface that is the inner end surface of the connection plate portion. An arrangement step of arranging in the connecting plate part;
In a state where the folded portion is in contact with the inner end surface of the connecting plate portion, a protruding portion provided in a protruding shape on the plate material contacts an outer end surface which is an outer end surface of the connecting plate portion, and A method of manufacturing a storage element, comprising: a bending step of bending the plate material such that the plate material sandwiches the end portion of the electrode body and the connection plate portion.
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