JP5418261B2 - Battery and manufacturing method thereof - Google Patents

Battery and manufacturing method thereof Download PDF

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JP5418261B2
JP5418261B2 JP2010022250A JP2010022250A JP5418261B2 JP 5418261 B2 JP5418261 B2 JP 5418261B2 JP 2010022250 A JP2010022250 A JP 2010022250A JP 2010022250 A JP2010022250 A JP 2010022250A JP 5418261 B2 JP5418261 B2 JP 5418261B2
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lid member
shaft core
insertion hole
battery
electrode body
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JP2011159582A (en
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和幸 草間
智浩 松浦
靖 平川
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Toyota Motor Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Description

本発明は、電池及びその製造方法に関する。   The present invention relates to a battery and a manufacturing method thereof.

近年、エネルギー密度の高い電池として、捲回電極体を有する電池が提案されている（例えば、特許文献１参照）。   In recent years, a battery having a wound electrode body has been proposed as a battery having a high energy density (see, for example, Patent Document 1).

特開平８−２５００８４号公報JP-A-8-250084

特許文献１の電池は、軸芯（内管）と、正極板、負極板、及びセパレータを軸芯の外周に捲回してなる捲回電極体（渦巻き状電極積層体）とを有する。捲回電極体の正極板は、軸芯と電気的に接続している。さらに、特許文献１の電池は、捲回電極体を収容する筒状のケース本体（外管）と、ケース本体の開口を塞ぐ蓋部材（リング状封口板）とを有する。蓋部材は、捲回電極体が捲回されてなる軸芯のうち捲回電極体から突出する突出部（端部）が挿入された挿入孔を有する。特許文献１の電池は、次のようにして製造する。   The battery of Patent Document 1 includes a shaft core (inner tube) and a wound electrode body (a spiral electrode stack) formed by winding a positive electrode plate, a negative electrode plate, and a separator around the outer periphery of the shaft core. The positive electrode plate of the wound electrode body is electrically connected to the shaft core. Furthermore, the battery of patent document 1 has a cylindrical case main body (outer tube) that accommodates the wound electrode body, and a lid member (ring-shaped sealing plate) that closes the opening of the case main body. The lid member has an insertion hole into which a protruding portion (end portion) protruding from the wound electrode body is inserted in the shaft core formed by winding the wound electrode body. The battery of Patent Document 1 is manufactured as follows.

まず、軸芯の外周に捲回してなる捲回電極体を、軸芯と共にケース本体の内部に収容する。次いで、軸芯の突出部（端部）を蓋部材の挿入孔に挿入して、蓋部材をケース本体の開口の内側に配置する。その後、軸芯（円筒形状の内管）の突出部を、パイプ拡張手段を用いて、その内側から拡径させるように変形させて、軸芯の突出部と蓋部材とを圧着する。これにより、軸芯と蓋部材とが電気的に接続する。   First, the wound electrode body wound around the outer periphery of the shaft core is housed inside the case body together with the shaft core. Next, the protruding portion (end portion) of the shaft core is inserted into the insertion hole of the lid member, and the lid member is disposed inside the opening of the case body. Thereafter, the projecting portion of the shaft core (cylindrical inner tube) is deformed so as to be expanded from the inside by using a pipe expanding means, and the projecting portion of the shaft core and the lid member are pressure-bonded. Thereby, the shaft core and the lid member are electrically connected.

ところが、捲回電極体と共にケース本体の内部に収容された軸芯が、ケース本体の軸線に対し傾いたり（軸芯の軸線がケース本体の軸線に対し傾いた状態となる）、軸ズレ（両者の軸線の位置ズレ）することがある。このような場合には、軸芯の突出部を蓋部材の挿入孔に挿入して、蓋部材をケース本体の開口の内側に配置（挿入）しようとしても、適切に、蓋部材をケース本体の開口の内側に配置できないことがあった。   However, the shaft core housed inside the case body together with the wound electrode body is tilted with respect to the axis of the case body (the axis of the shaft core is tilted with respect to the axis of the case body). May be misaligned). In such a case, even if the protruding portion of the shaft core is inserted into the insertion hole of the lid member and the lid member is arranged (inserted) inside the opening of the case body, the lid member is appropriately attached to the case body. In some cases, it could not be placed inside the opening.

具体的には、軸芯の突出部を蓋部材の挿入孔に挿入するようにして、蓋部材をケース本体の開口の内側に配置しようとしても、軸芯がケース本体の軸線に対し傾いていたり軸ズレしているために、軸芯の突出部が蓋部材に衝突してしまい、軸芯の突出部を蓋部材の挿入孔に挿入できないことがあった。このため、蓋部材を、ケース本体の開口の内側の所定位置に配置できないことがあった。   Specifically, even if the projection of the shaft core is inserted into the insertion hole of the lid member and the lid member is arranged inside the opening of the case body, the shaft core is inclined with respect to the axis of the case body. Since the shaft is misaligned, the protruding portion of the shaft core collides with the lid member, and the protruding portion of the shaft core may not be inserted into the insertion hole of the lid member. For this reason, the lid member may not be disposed at a predetermined position inside the opening of the case body.

また、前述のように、特許文献１の電池では、軸芯の突出部と蓋部材とを圧着させて、両者を電気的に接続する。このような接続では、軸芯と蓋部材との間の電気抵抗（接触抵抗）が大きくなっていた。   Further, as described above, in the battery of Patent Document 1, the protruding portion of the shaft core and the lid member are pressure-bonded to electrically connect them. In such connection, the electrical resistance (contact resistance) between the shaft core and the lid member is large.

本発明は、かかる現状に鑑みてなされたものであって、捲回電極体と共にケース本体の内部に収容した軸芯が、ケース本体の軸線に対し傾いていたり軸ズレしている場合でも、軸芯の突出部を蓋部材の挿入孔に挿入して、適切に、蓋部材をケース本体の開口の内側に配置することができ、しかも、軸芯と蓋部材との間の電気抵抗を小さくすることができる電池の製造方法、及び、電池を提供することを目的とする。   The present invention has been made in view of such a situation, and the shaft core housed in the case body together with the wound electrode body is inclined or misaligned with respect to the axis of the case body. By inserting the protruding portion of the core into the insertion hole of the lid member, the lid member can be appropriately disposed inside the opening of the case body, and the electrical resistance between the shaft core and the lid member is reduced. An object of the present invention is to provide a battery manufacturing method and a battery.

本発明の一態様は、軸芯と、正極板、負極板、及びセパレータを上記軸芯の外周に捲回してなる捲回電極体であって、上記正極板または上記負極板が上記軸芯と電気的に接続してなる捲回電極体と、上記捲回電極体を収容する有底筒状のケース本体と、上記ケース本体の開口を塞ぐ蓋部材であって、上記捲回電極体が捲回されてなる上記軸芯のうち上記捲回電極体から軸線方向先端側に突出する突出部が挿入される挿入孔を有する蓋部材と、を備える電池の製造方法であって、上記蓋部材の上記挿入孔は、平面視細長形状をなし、当該挿入孔に上記軸芯の上記突出部を挿入したときに、上記挿入孔内において、上記突出部と上記蓋部材とが、上記挿入孔の短手方向について近接または接触する寸法を有し、上記軸芯の外周に捲回してなる上記捲回電極体を、上記軸芯と共に上記ケース本体の内部に収容する収容工程と、上記軸芯の上記突出部を上記蓋部材の上記挿入孔に挿入して、上記蓋部材を上記ケース本体の上記開口の内側に配置する配置工程と、上記挿入孔に挿入された上記軸芯の上記突出部のうち、上記挿入孔の短手方向について上記蓋部材と近接または接触する部位を、上記蓋部材と溶接する溶接工程と、を備える電池の製造方法である。   One aspect of the present invention is a wound electrode body in which a shaft core, a positive electrode plate, a negative electrode plate, and a separator are wound around the outer periphery of the shaft core, and the positive electrode plate or the negative electrode plate is connected to the shaft core. A wound electrode body that is electrically connected; a bottomed cylindrical case body that accommodates the wound electrode body; and a lid member that closes an opening of the case body, wherein the wound electrode body is wound A lid member having an insertion hole into which a projecting portion that projects from the wound electrode body to the distal end side in the axial direction is inserted among the shaft core that is rotated, the battery manufacturing method comprising: The insertion hole has an elongated shape in plan view, and when the protruding portion of the shaft core is inserted into the insertion hole, the protruding portion and the lid member are short in the insertion hole. It has a size that is close to or in contact with the hand direction, and is wound around the outer periphery of the shaft core. A housing step of housing the rotating electrode body together with the shaft core inside the case main body, and inserting the protruding portion of the shaft core into the insertion hole of the lid member so that the lid member is mounted on the case body. Of the projecting portion of the shaft core inserted into the insertion hole and the arrangement step of placing the inner side of the opening, a portion that is close to or in contact with the lid member in the short direction of the insertion hole is defined as the lid member. And a welding process for welding.

上述の電池の製造方法では、蓋部材として、平面視細長形状をなす挿入孔を有する蓋部材を用いる。この蓋部材の挿入孔は、自身に軸芯の突出部（捲回電極体が捲回されてなる軸芯のうち捲回電極体から軸線方向先端側に突出する部位）を軸線方向に挿入したときに、挿入孔内において、突出部と蓋部材とが、挿入孔の短手方向について近接または接触し、挿入孔の長手方向については短手方向に比べて大きく離間する寸法を有する。例えば、円筒形状の突出部に対し、蓋部材の挿入孔を長孔とし、この長孔の短手方向の寸法を突出部の外径より僅かに大きな寸法とした場合（長手方向の寸法は、短手方向の寸法よりも大きく、例えば突出部の外径の２倍以上）が挙げられる。   In the battery manufacturing method described above, a lid member having an insertion hole having an elongated shape in plan view is used as the lid member. The insertion hole of the lid member has an axial core protruding portion (a portion of the axial core formed by winding the wound electrode body that protrudes from the wound electrode body toward the distal end in the axial direction) inserted in the axial direction. Sometimes, in the insertion hole, the projecting portion and the lid member are close to or in contact with each other in the short direction of the insertion hole, and have a size that is far apart in the longitudinal direction of the insertion hole compared to the short direction. For example, when the insertion hole of the lid member is a long hole with respect to the cylindrical protrusion, and the dimension in the short direction of the long hole is slightly larger than the outer diameter of the protrusion (the dimension in the longitudinal direction is The dimension is larger than the dimension in the short direction, for example, twice or more the outer diameter of the protrusion.

このため、収容工程において捲回電極体と共にケース本体の内部に収容した軸芯が、ケース本体の軸線に対し傾いていたり軸ズレしている場合でも、配置工程において、軸芯の傾き方向や軸ズレ方向に挿入孔の長手方向を合わせて、軸芯の突出部を蓋部材の挿入孔に挿入することで、適切に、蓋部材をケース本体の開口の内側に配置することができる。詳細には、ケース本体の軸線に対し傾いていたり軸ズレしている軸芯が蓋部材に当たって挿入孔内への挿入が妨げられないように、上記軸芯を挿入孔の長手方向に逃がすように挿入孔に挿入することで、適切に、蓋部材をケース本体の開口の内側に配置することができる。   For this reason, even if the shaft core housed in the case body together with the wound electrode body in the housing process is inclined or misaligned with respect to the axis of the case body, the tilting direction and the axis of the shaft core are arranged in the placement process. By aligning the longitudinal direction of the insertion hole with the displacement direction and inserting the protruding portion of the shaft core into the insertion hole of the lid member, the lid member can be appropriately disposed inside the opening of the case body. Specifically, the shaft core is allowed to escape in the longitudinal direction of the insertion hole so that the shaft core that is inclined with respect to the axis line of the case body does not interfere with the insertion into the insertion hole by hitting the lid member. By inserting it into the insertion hole, the lid member can be appropriately arranged inside the opening of the case body.

さらに、上述の電池の製造方法では、溶接工程において、挿入孔に挿入された軸芯の突出部のうち、挿入孔の短手方向について蓋部材と近接または接触する部位を、蓋部材と溶接する。このように、軸芯の突出部と蓋部材とを溶接して、両者を電気的に接続することで、両者の間の電気抵抗を小さくすることができる。   Further, in the battery manufacturing method described above, in the welding step, a portion of the protruding portion of the shaft core inserted into the insertion hole that is close to or in contact with the lid member in the short direction of the insertion hole is welded to the lid member. . Thus, the electrical resistance between both can be made small by welding the protrusion part of a shaft core, and a cover member, and connecting both electrically.

さらに、上記の電池の製造方法であって、前記配置工程に先立って、電気絶縁性を有する被覆部材により、前記捲回電極体のうち前記軸線方向先端側の端部を覆う被覆工程を備える電池の製造方法とすると良い。   Furthermore, the battery manufacturing method described above, wherein the battery includes a covering step of covering an end of the wound electrode body on the front end side in the axial direction with a covering member having electrical insulation prior to the arranging step. It is good to use this manufacturing method.

上述の電池の製造方法では、配置工程より前の被覆工程において、電気絶縁性を有する被覆部材により、捲回電極体の軸線方向先端側の端部を覆う。これにより、その後の溶接工程において、軸芯の突出部と蓋部材とを溶接したときにスパッタが発生（飛散）した場合には、被覆部材により、発生したスパッタが捲回電極体の内部に進入するのを防止することができる。従って、スパッタによる捲回電極体の内部短絡を抑制することができる。   In the battery manufacturing method described above, in the covering step prior to the arranging step, the end of the wound electrode body on the tip side in the axial direction is covered with a covering member having electrical insulation. Thus, in the subsequent welding process, when spatter is generated (scattered) when the protruding portion of the shaft core and the lid member are welded, the generated spatter enters the inside of the wound electrode body by the covering member. Can be prevented. Therefore, an internal short circuit of the wound electrode body due to sputtering can be suppressed.

なお、捲回電極体のうち軸線方向先端側の端部は、捲回電極体のうち、後の配置工程において蓋部材が配置される側（ケース本体の開口側）の端部に相当する。従って、軸芯の突出部と蓋部材とを溶接するとき、被覆部材は、蓋部材と捲回電極体との間に位置し、捲回電極体の軸線方向先端側の端部を覆った状態になっている。   The end of the wound electrode body on the tip side in the axial direction corresponds to the end of the wound electrode body on the side (opening side of the case main body) on which the lid member is disposed in the subsequent placement step. Therefore, when welding the protruding portion of the shaft core and the lid member, the covering member is located between the lid member and the wound electrode body and covers the end of the wound electrode body on the front end side in the axial direction. It has become.

さらに、上記の電池の製造方法であって、前記被覆部材は、前記軸芯の前記突出部を挿通させる挿通孔を有し、前記被覆工程は、前記捲回電極体が捲回されてなる上記軸芯の上記突出部を上記挿通孔に挿通させつつ、上記捲回電極体の前記軸線方向先端側に上記被覆部材を配置して、上記被覆部材により、上記捲回電極体のうち上記軸線方向先端側の端部を覆う電池の製造方法とするのが好ましい。   Furthermore, in the battery manufacturing method described above, the covering member has an insertion hole through which the protruding portion of the shaft core is inserted, and the covering step includes winding the wound electrode body. The covering member is arranged on the distal end side in the axial direction of the wound electrode body while the protruding portion of the shaft core is inserted into the insertion hole, and the axial direction of the wound electrode body is arranged by the covering member. It is preferable to use a battery manufacturing method that covers the end portion on the front end side.

捲回電極体が捲回されてなる軸芯の突出部を被覆部材の挿通孔に挿通させつつ、捲回電極体の軸線方向先端側に被覆部材を配置することで、容易且つ適切に、被覆部材によって捲回電極体の軸線方向先端側の端部を覆うことができる。これにより、その後の溶接工程において、軸芯の突出部と蓋部材とを溶接したときにスパッタが発生（飛散）した場合には、被覆部材により、発生したスパッタが捲回電極体の内部に進入するのを防止することができる。従って、スパッタによる捲回電極体の内部短絡を抑制することができる。   By covering the protruding portion of the axial core formed by winding the wound electrode body through the insertion hole of the covering member and arranging the covering member on the distal end side in the axial direction of the wound electrode body, it is possible to easily and appropriately cover the winding electrode body. The end of the wound electrode body on the tip side in the axial direction can be covered with the member. Thus, in the subsequent welding process, when spatter is generated (scattered) when the protruding portion of the shaft core and the lid member are welded, the generated spatter enters the inside of the wound electrode body by the covering member. Can be prevented. Therefore, an internal short circuit of the wound electrode body due to sputtering can be suppressed.

さらに、上記いずれかの電池の製造方法であって、前記軸芯の前記突出部は、自身の径方向外側に突出した環状の鍔部を有し、前記配置工程は、上記軸芯の上記突出部のうち上記鍔部よりも軸線方向先端側の部位を前記蓋部材の前記挿入孔に挿入して、上記蓋部材を、上記鍔部に対し上記軸線方向先端側に配置し、前記溶接工程は、上記蓋部材について上記鍔部が位置する側とは反対側で、上記蓋部材と上記軸芯とを溶接する電池の製造方法とすると良い。   Furthermore, in any one of the battery manufacturing methods described above, the projecting portion of the shaft core has an annular flange projecting outward in the radial direction of the battery, and the arranging step includes the projecting of the shaft core. A portion of the portion closer to the distal end side in the axial direction than the flange portion is inserted into the insertion hole of the lid member, the lid member is disposed on the distal end side in the axial direction with respect to the flange portion, and the welding step A method of manufacturing a battery in which the lid member and the shaft core are welded on the side of the lid member opposite to the side on which the flange portion is located is preferable.

上述の電池の製造方法では、軸芯として、突出部の径方向外側に突出した環状の鍔部を有する軸芯を用いる。そして、配置工程では、軸芯の突出部のうち鍔部よりも軸線方向先端側の部位を蓋部材の挿入孔に挿入して、蓋部材を、鍔部に対し軸線方向先端側（捲回電極体が位置する側とは反対側）に配置する（鍔部よりも軸線方向先端側に蓋部材を配置する）。これにより、蓋部材に対し捲回電極体側（軸線方向後端側）の位置で、蓋部材の挿入孔の一部または全部を、軸芯の鍔部によって塞ぐことができる。   In the battery manufacturing method described above, an axial core having an annular flange protruding outward in the radial direction of the protruding portion is used as the axial core. Then, in the arranging step, a portion of the protruding portion of the axial core that is closer to the distal end side in the axial direction than the flange portion is inserted into the insertion hole of the lid member, and the lid member is moved to the distal end side in the axial direction relative to the flange portion (the wound electrode). It arrange | positions on the opposite side to the side where a body is located (a cover member is arrange | positioned in the axial direction front end side rather than a collar part). Thereby, a part or all of the insertion hole of a cover member can be block | closed with the collar part of an axial core in the position of the winding electrode body side (axial direction rear end side) with respect to a cover member.

さらに、溶接工程では、蓋部材について鍔部が位置する側とは反対側（軸線方向先端側）で、蓋部材と軸芯とを溶接する。例えば、蓋部材について鍔部が位置する側とは反対側から、軸芯（突出部）と蓋部材とが蓋部材の挿入孔の短手方向について互いに近接または接触する位置にレーザービームを照射して、蓋部材と軸芯（突出部）とを溶接する。このとき、前述のように、蓋部材に対し捲回電極体側（軸線方向後端側）の位置で、蓋部材の挿入孔の一部または全部を軸芯の鍔部によって塞いでいるので、溶接時に発生したスパッタが、挿入孔を通過して、捲回電極体の内部に進入するのを抑制することができる。これにより、スパッタによる捲回電極体の内部短絡を抑制することができる。   Furthermore, in the welding process, the lid member and the shaft core are welded on the side opposite to the side where the collar portion is located (the tip end side in the axial direction). For example, the laser beam is irradiated from the opposite side of the lid member to the side where the collar portion is located at a position where the shaft core (projecting portion) and the lid member are close to or in contact with each other in the short direction of the insertion hole of the lid member. Then, the lid member and the shaft core (protrusion) are welded. At this time, as described above, a part or all of the insertion hole of the lid member is closed by the flange portion of the shaft core at the position on the wound electrode body side (the rear end side in the axial direction) with respect to the lid member. It is possible to suppress spatter generated at times from entering the inside of the wound electrode body through the insertion hole. Thereby, the internal short circuit of the wound electrode body by sputtering can be suppressed.

なお、軸芯の突出部と蓋部材とを溶接するとき、軸芯の鍔部は、蓋部材と捲回電極体との間に位置し、蓋部材の挿入孔の一部または全部を塞いだ状態になっている。   When welding the protruding portion of the shaft core and the lid member, the flange portion of the shaft core is located between the lid member and the wound electrode body and blocks part or all of the insertion hole of the lid member. It is in a state.

本発明の他の態様は、軸芯と、正極板、負極板、及びセパレータを上記軸芯の外周に捲回してなる捲回電極体であって、上記正極板または上記負極板が上記軸芯と電気的に接続してなる捲回電極体と、上記捲回電極体を収容する有底筒状のケース本体と、上記ケース本体の開口を塞ぐ蓋部材であって、上記捲回電極体が捲回されてなる上記軸芯のうち上記捲回電極体から軸線方向先端側に突出する突出部が挿入された挿入孔を有する蓋部材と、を備える電池であって、上記蓋部材の上記挿入孔は、平面視細長形状をなし、上記挿入孔に挿入された上記軸芯の上記突出部と上記蓋部材とは、上記挿入孔内において、上記挿入孔の短手方向について近接または接触し、上記挿入孔に挿入された上記軸芯の上記突出部のうち、上記挿入孔の短手方向について上記蓋部材と近接または接触する部位が、上記蓋部材と溶接されてなる電池である。   Another aspect of the present invention is a wound electrode body in which a shaft core, a positive electrode plate, a negative electrode plate, and a separator are wound around the outer periphery of the shaft core, wherein the positive electrode plate or the negative electrode plate is the shaft core. A wound electrode body that is electrically connected to the casing, a bottomed cylindrical case body that accommodates the wound electrode body, and a lid member that closes an opening of the case body, wherein the wound electrode body is A lid member having an insertion hole into which a projecting portion that projects from the wound electrode body toward the axial front end side of the wound electrode body is inserted, and the insertion of the lid member The hole has an elongated shape in plan view, and the protruding portion of the shaft core inserted into the insertion hole and the lid member are close to or in contact with each other in the short direction of the insertion hole in the insertion hole, Of the protrusions of the shaft core inserted into the insertion hole, the short direction of the insertion hole Site close to or in contact with the lid member with a, a battery formed by welding with the lid member.

上述の電池では、蓋部材として、平面視細長形状をなす挿入孔を有する蓋部材を用いている。そして、挿入孔に挿入された軸芯の突出部と蓋部材とは、挿入孔内において、挿入孔の短手方向について近接または接触する（挿入孔の長手方向については、突出部と蓋部材とが短手方向に比べて大きく離間する）。すなわち、蓋部材の挿入孔が、自身に軸芯の突出部を軸線方向に挿入したときに、挿入孔内において、突出部と蓋部材とが、挿入孔の短手方向について近接または接触し、挿入孔の長手方向については短手方向に比べて大きく離間する寸法を有する。例えば、円筒形状の突出部に対し、蓋部材の挿入孔を長孔とし、この長孔の短手方向の寸法を突出部の外径より僅かに大きな寸法とした場合（長手方向の寸法は、短手方向の寸法よりも大きく、例えば突出部の外径の２倍以上）が挙げられる。   In the above-described battery, a lid member having an insertion hole having an elongated shape in plan view is used as the lid member. Then, the protruding portion of the shaft core inserted into the insertion hole and the lid member are close to or in contact with each other in the short direction of the insertion hole within the insertion hole (the protruding portion and the lid member are in the longitudinal direction of the insertion hole). Is far apart compared to the short direction). That is, when the insertion hole of the lid member inserts the protruding portion of the axial core in the axial direction, the protruding portion and the lid member are close to or in contact with each other in the short direction of the insertion hole in the insertion hole, The longitudinal direction of the insertion hole has a size that is far away from that of the short side. For example, when the insertion hole of the lid member is a long hole with respect to the cylindrical protrusion, and the dimension in the short direction of the long hole is slightly larger than the outer diameter of the protrusion (the dimension in the longitudinal direction is The dimension is larger than the dimension in the short direction, for example, twice or more the outer diameter of the protrusion.

蓋部材の挿入孔をこのような形状（寸法）とすることで、電池を製造するとき（前述の配置工程において）、捲回電極体と共にケース本体の内部に収容した軸芯が、ケース本体の軸線に対し傾いていたり軸ズレしている場合でも、前述のように、軸芯の突出部を蓋部材の挿入孔に挿入して、適切に、蓋部材をケース本体の開口の内側に配置することができる。従って、上述の電池は、軸芯がケース本体の軸線に対し傾いていたり軸ズレしていても、蓋部材がケース本体の開口の内側に配置された電池となる。   By making the insertion hole of the lid member into such a shape (dimension), when manufacturing a battery (in the above-described arrangement step), the shaft core housed inside the case body together with the wound electrode body is Even when it is inclined or misaligned with respect to the axis, as described above, the protruding portion of the shaft core is inserted into the insertion hole of the lid member, and the lid member is appropriately disposed inside the opening of the case body. be able to. Therefore, the above-described battery is a battery in which the lid member is disposed inside the opening of the case body even when the axis is inclined or misaligned with respect to the axis of the case body.

さらに、上述の電池では、挿入孔に挿入された軸芯の突出部のうち、挿入孔の短手方向について蓋部材と近接または接触する部位が、蓋部材と溶接されている。このように、軸芯の突出部と蓋部材とを溶接して、両者を電気的に接続しているので、両者の間の電気抵抗を小さくすることができる。   Furthermore, in the battery described above, a portion of the protruding portion of the shaft core that is inserted into the insertion hole is in contact with or in contact with the lid member in the short direction of the insertion hole. As described above, since the protruding portion of the shaft core and the lid member are welded and both are electrically connected, the electrical resistance between the two can be reduced.

さらに、上記の電池であって、電気絶縁性を有する被覆部材であって、前記蓋部材と前記捲回電極体との間に位置し、上記捲回電極体のうち上記蓋部材側の端部を覆う被覆部材を備える電池とすると良い。   Further, the battery is an electrically insulating covering member, which is located between the lid member and the wound electrode body, and is an end of the wound electrode body on the lid member side. A battery provided with a covering member covering the battery is preferable.

上述の電池は、蓋部材と捲回電極体との間に位置し、捲回電極体のうち蓋部材側の端部を覆う被覆部材を備えている。このように、被覆部材によって捲回電極体の蓋部材側（軸線方向先端側）の端部を覆うことで、電池の製造時に（前述の溶接工程において）、軸芯の突出部と蓋部材とを溶接したときに発生したスパッタが、捲回電極体の内部に進入するのを防止することができる。従って、上述の電池は、スパッタによる捲回電極体の内部短絡等が防止された電池となる。   The battery described above includes a covering member that is positioned between the lid member and the wound electrode body and covers an end portion of the wound electrode body on the lid member side. In this way, by covering the end of the wound electrode body on the cover member side (front end side in the axial direction) with the covering member, at the time of manufacturing the battery (in the above-described welding process), the protruding portion of the shaft core, the cover member, It is possible to prevent spatter generated when welding is made from entering the inside of the wound electrode body. Therefore, the above-described battery is a battery in which an internal short circuit of the wound electrode body due to sputtering is prevented.

さらに、上記の電池であって、前記被覆部材は、前記軸芯の前記突出部を挿通させる挿通孔を有し、上記挿通孔に上記突出部を挿通させて、前記捲回電極体のうち前記蓋部材側の端部を覆ってなる電池とするのが好ましい。   Furthermore, in the above battery, the covering member has an insertion hole through which the protruding portion of the shaft core is inserted, and the protruding portion is inserted through the insertion hole, and the covering electrode body includes the insertion hole. It is preferable to use a battery that covers the end on the lid member side.

上述の電池では、被覆部材として、軸芯の突出部を挿通させる挿通孔を有する被覆部材を用いている。このため、被覆部材の挿通孔に突出部を挿通させることで、適切に、被覆部材によって捲回電極体の蓋部材側の端部を覆うことができる。   In the above-described battery, a covering member having an insertion hole for inserting the protruding portion of the shaft core is used as the covering member. For this reason, the edge part by the side of the lid | cover member of a winding electrode body can be appropriately covered with a coating | coated member by inserting a protrusion part in the penetration hole of a coating | coated member.

さらに、上記いずれかの電池であって、前記軸芯の前記突出部は、自身の径方向外側に突出した環状の鍔部を有し、前記蓋部材は、上記軸芯の上記突出部のうち上記鍔部よりも軸線方向先端側の部位を前記挿入孔に挿入させた状態で、上記鍔部に対し上記軸線方向先端側に配置され、上記鍔部が位置する側とは反対側で上記軸芯と溶接されてなる電池とすると良い。   Furthermore, in any one of the above batteries, the projecting portion of the shaft core has an annular flange projecting outward in the radial direction of the battery, and the lid member is included in the projecting portion of the shaft core. With the portion on the axially distal end side than the flange portion inserted into the insertion hole, the shaft is disposed on the axially distal end side with respect to the flange portion, and on the side opposite to the side where the flange portion is located, the shaft The battery is preferably welded to the core.

上述の電池は、軸芯として、突出部の径方向外側に突出した環状の鍔部を有する軸芯を用いる。
さらに、蓋部材は、軸芯の突出部のうち鍔部よりも軸線方向先端側の部位を挿入孔に挿入させた状態で、鍔部に対し軸線方向先端側に配置され、鍔部が位置する側とは反対側で軸芯と溶接されている。 The battery described above uses an axial core having an annular flange protruding outward in the radial direction of the protruding portion as the axial core.
Furthermore, the lid member is disposed on the distal end side in the axial direction with respect to the collar portion in a state where the portion on the axial direction distal end side of the projection portion of the shaft core is inserted into the insertion hole, and the collar portion is positioned. It is welded to the shaft core on the side opposite to the side.

軸芯の突出部のうち鍔部よりも軸線方向先端側の部位を挿入孔に挿入して、蓋部材を、鍔部に対し軸線方向先端側（捲回電極体が位置する側とは反対側）に配置する（鍔部よりも軸線方向先端側に蓋部材を配置する）ことで、蓋部材に対し捲回電極体側（軸線方向後端側）の位置で、蓋部材の挿入孔の一部または全部を、軸芯の鍔部によって塞ぐことができる。
さらに、この状態で、蓋部材について鍔部が位置する側とは反対側（軸線方向先端側）で、蓋部材と軸芯とを溶接することで、溶接時に発生したスパッタが、挿入孔を通過して、捲回電極体の内部に進入するのを、鍔部によって抑制することができる。従って、上述の電池は、スパッタによる捲回電極体の内部短絡等が防止された電池となる。 Insert a portion of the axial core projecting portion on the tip side in the axial direction with respect to the collar portion into the insertion hole, and place the lid member on the tip side in the axial direction with respect to the collar portion (the side opposite to the side where the wound electrode body is located). ) (The lid member is arranged on the front end side in the axial direction from the collar portion), so that a part of the insertion hole of the lid member is located at the position of the wound electrode body side (the rear end side in the axial direction) with respect to the lid member. Alternatively, the whole can be closed by the flange of the shaft core.
Furthermore, in this state, the spatter generated during welding passes through the insertion hole by welding the lid member and the shaft core on the side of the lid member opposite to the side where the collar portion is located (the tip end side in the axial direction). And it can suppress by a collar part entering the inside of a winding electrode body. Therefore, the above-described battery is a battery in which an internal short circuit of the wound electrode body due to sputtering is prevented.

実施例１にかかる電池の縦断面図である。1 is a longitudinal sectional view of a battery according to Example 1. FIG. 実施例１にかかる軸芯の縦断面図である。It is a longitudinal cross-sectional view of the shaft core concerning Example 1. FIG. 実施例１にかかる蓋部材の上面図である。3 is a top view of a lid member according to Embodiment 1. FIG. 同蓋部材の断面図であり、図３のＢ−Ｂ矢視断面図に相当する。FIG. 4 is a cross-sectional view of the lid member and corresponds to a cross-sectional view taken along the line BB in FIG. 3. 実施例１にかかる被覆部材の上面図である。1 is a top view of a covering member according to Example 1. FIG. 同被覆部材の断面図であり、図５のＣ−Ｃ矢視断面図である。It is sectional drawing of the said coating | coated member, and is CC sectional view taken on the line of FIG. 実施例１にかかる正極板を示す図である。1 is a diagram illustrating a positive electrode plate according to Example 1. FIG. 実施例１にかかる負極板を示す図である。1 is a diagram illustrating a negative electrode plate according to Example 1. FIG. 実施例１にかかる捲回工程を説明する図である。It is a figure explaining the winding process concerning Example 1. FIG. 実施例１にかかる収容工程を説明する図である。It is a figure explaining the accommodation process concerning Example 1. FIG. 実施例１にかかる被覆工程を説明する図である。It is a figure explaining the covering process concerning Example 1. FIG. 実施例１にかかる配置工程を説明する図である。It is a figure explaining the arrangement | positioning process concerning Example 1. FIG. 実施例１，２にかかる配置工程を説明する図であり、ケース本体の軸線に対し軸芯が傾いている場合の説明図である。It is a figure explaining the arrangement | positioning process concerning Example 1, 2, and is an explanatory view in case the axial center inclines with respect to the axis line of a case main body. 実施例１，２にかかる配置工程を説明する図であり、ケース本体の軸線に対し軸芯が軸ズレしている場合の説明図である。It is a figure explaining the arrangement | positioning process concerning Example 1, 2, and is an explanatory view in case the axial center has shifted | deviated with respect to the axis line of a case main body. 実施例１にかかる溶接工程を説明する図である。It is a figure explaining the welding process concerning Example 1. FIG. 実施例２にかかる電池の縦断面図である。4 is a longitudinal sectional view of a battery according to Example 2. FIG. 実施例２にかかる軸芯の縦断面図である。It is a longitudinal cross-sectional view of the shaft core concerning Example 2. FIG. 実施例２にかかる溶接工程を説明する図である。It is a figure explaining the welding process concerning Example 2. FIG. 実施例２にかかる溶接工程を説明する図である。It is a figure explaining the welding process concerning Example 2. FIG. 従来の配置工程における不具合を説明する図であり、ケース本体の軸線に対し軸芯が傾いている場合の説明図である。It is a figure explaining the malfunction in the conventional arrangement | positioning process, and is an explanatory view in case the axial center inclines with respect to the axis line of a case main body. 従来の配置工程における不具合を説明する図であり、ケース本体の軸線に対し軸芯が軸ズレしている場合の説明図である。It is a figure explaining the malfunction in the conventional arrangement | positioning process, and is an explanatory view in case the axial center has shifted | deviated with respect to the axis line of a case main body.

（実施例１）
図１は、実施例１にかかる電池１の縦断面図（軸線ＡＸ１に沿って切断した断面図）である。本実施例１の電池１は、円筒形状の電池である（図１参照）。この電池１は、捲回電極体４０と、この捲回電極体４０を収容する電池ケース６０とを有する。このうち、捲回電極体４０は、正極板１０と負極板２０とセパレータ３０とが、軸芯４５の外周に捲回された円筒形状の捲回電極体である。なお、捲回電極体４０は、捲回数５０の捲回電極体（正極板１０、負極板２０、及びセパレータ３０を積層した積層体を、軸芯４５の周りに５０回巻いた捲回電極体）であるが、図１等では、捲回電極体４０の巻数を簡略化（５回巻に簡略化）している。また、後述するように、正極板１０は軸芯４５と電気的に接続されている。 Example 1
FIG. 1 is a vertical cross-sectional view (a cross-sectional view cut along the axis AX1) of the battery 1 according to the first embodiment. The battery 1 of the first embodiment is a cylindrical battery (see FIG. 1). The battery 1 includes a wound electrode body 40 and a battery case 60 that houses the wound electrode body 40. Among these, the wound electrode body 40 is a cylindrical wound electrode body in which the positive electrode plate 10, the negative electrode plate 20, and the separator 30 are wound around the outer periphery of the shaft core 45. Note that the wound electrode body 40 is a wound electrode body in which a wound electrode body (a laminated body in which the positive electrode plate 10, the negative electrode plate 20, and the separator 30 are stacked) is wound 50 times around the axis 45. However, in FIG. 1 and the like, the number of turns of the wound electrode body 40 is simplified (simplified to 5 turns). Further, as described later, the positive electrode plate 10 is electrically connected to the shaft core 45.

軸芯４５は、図２に示すように、軸孔４５ｊを有する円筒形状をなし、金属（例えば、アルミニウム）からなる金属部４５ｂと、樹脂（例えば、ポリプロピレン）からなる樹脂部４５ｆとを有している。詳細には、金属部４５ｂの軸線方向後端部４５ｃを、樹脂部４５ｆの軸線方向先端部４５ｇの内側に圧入することで、金属部４５ｂと樹脂部４５ｆとを一体にして、軸芯４５を構成している。なお、軸芯４５のうち、捲回電極体４０から軸線方向先端側（図１において上側）に突出する部位を突出部４５ｔとする。本実施例１では、突出部４５ｔは、金属部４５ｂにより構成される（図１及び図２参照）。   As shown in FIG. 2, the shaft core 45 has a cylindrical shape having a shaft hole 45j, and includes a metal portion 45b made of metal (for example, aluminum) and a resin portion 45f made of resin (for example, polypropylene). ing. Specifically, the metal part 45b and the resin part 45f are integrated by press-fitting the axially rear end part 45c of the metal part 45b inside the axially forward end part 45g of the resin part 45f, so that the shaft core 45 is integrated. It is composed. In addition, let the site | part which protrudes in the axial direction front end side (upper side in FIG. 1) from the winding electrode body 40 among the axial cores 45 be the protrusion part 45t. In the first embodiment, the protrusion 45t is configured by a metal part 45b (see FIGS. 1 and 2).

正極板１０は、図７に示すように、正極集電箔１１が延びる長手方向（図７において左右方向）の一方辺１０ｂに沿って延び、正極集電箔１１及び正極合材層１２を有する正極活物質塗工部１４と、この正極活物質塗工部１４と隣り合って長手方向の一方辺１０ｂに沿って延び、正極合材層１２を有することなく、正極集電箔１１のみからなる正極活物質未塗工部１３とを有している。   As shown in FIG. 7, the positive electrode plate 10 extends along one side 10 b in the longitudinal direction (left and right direction in FIG. 7) in which the positive electrode current collector foil 11 extends, and includes the positive electrode current collector foil 11 and the positive electrode mixture layer 12. The positive electrode active material coating part 14 and the positive electrode active material coating part 14 are adjacent to the positive electrode active material application part 14 and extend along the one side 10b in the longitudinal direction. A positive electrode active material uncoated portion 13.

なお、正極集電箔１１としては、例えば、アルミニウム箔を用いることができる。また、正極合材層１２は、正極活物質やバインダなどにより構成されている。正極活物質としては、例えば、ニッケル酸リチウムを用いることができる。   For example, an aluminum foil can be used as the positive electrode current collector foil 11. The positive electrode mixture layer 12 is made of a positive electrode active material, a binder, or the like. As the positive electrode active material, for example, lithium nickelate can be used.

負極板２０は、図８に示すように、負極集電箔２１が延びる長手方向（図８において左右方向）の一方辺２０ｂに沿って延び、負極集電箔２１及び負極合材層２２を有する負極活物質塗工部２４と、この負極活物質塗工部２４と隣り合って長手方向の一方辺２０ｂに沿って延び、負極合材層２２を有することなく、負極集電箔２１のみからなる負極活物質未塗工部２３とを有している。   As shown in FIG. 8, the negative electrode plate 20 extends along one side 20 b in the longitudinal direction (left-right direction in FIG. 8) in which the negative electrode current collector foil 21 extends, and includes the negative electrode current collector foil 21 and the negative electrode mixture layer 22. The negative electrode active material coating part 24 and the negative electrode active material coating part 24 are adjacent to the negative electrode active material coating part 24 and extend along the one side 20b in the longitudinal direction. A negative electrode active material uncoated portion 23.

なお、負極集電箔２１としては、例えば、銅箔を用いることができる。また、負極合材層２２は、負極活物質やバインダなどにより構成されている。負極活物質としては、例えば、天然黒鉛を用いることができる。   As the negative electrode current collector foil 21, for example, a copper foil can be used. The negative electrode mixture layer 22 is composed of a negative electrode active material, a binder, or the like. As the negative electrode active material, for example, natural graphite can be used.

また、捲回電極体４０の軸線方向先端部（図１において上端部）をなし、正極板１０の正極活物質未塗工部１３が捲回電極体４０の径方向（図１において左右方向）に間隙Ｓ１をあけて捲回されている部位を、正極捲回部４４とする。また、捲回電極体４０の軸線方向後端部（図１において下端部）をなし、負極板２０の負極活物質未塗工部２３が捲回電極体４０の径方向（図１において左右方向）に間隙Ｓ２をあけて捲回されている部位を、負極捲回部４６とする。また、正極捲回部４４と負極捲回部４６との間に位置し、正極板１０（正極活物質塗工部１４）と負極板２０（負極活物質塗工部２４）とセパレータ３０とが捲回されてなる部位を、発電部４２とする。   Moreover, the axial direction front-end | tip part (upper end part in FIG. 1) of the winding electrode body 40 is comprised, and the positive electrode active material uncoated part 13 of the positive electrode plate 10 is the radial direction (left-right direction in FIG. 1) of the winding electrode body 40. A portion wound with a gap S <b> 1 is defined as a positive electrode winding portion 44. Moreover, the axial direction rear-end part (lower end part in FIG. 1) of the winding electrode body 40 is comprised, and the negative electrode active material uncoated part 23 of the negative electrode plate 20 is the radial direction (left-right direction in FIG. 1) of the winding electrode body 40. The portion wound with a gap S2 is taken as a negative electrode wound portion 46. Moreover, it is located between the positive electrode winding part 44 and the negative electrode winding part 46, and the positive electrode plate 10 (positive electrode active material application part 14), the negative electrode plate 20 (negative electrode active material application part 24), and the separator 30 are included. The portion that is wound is referred to as a power generation unit 42.

なお、正極捲回部４４を構成する正極活物質未塗工部１３は、例えば、リード（金属製の接続部材、図示省略）により、軸芯４５の突出部４５ｔ（金属部４５ｂ）に電気的に接続されている。   The positive electrode active material uncoated portion 13 constituting the positive electrode winding portion 44 is electrically connected to the protruding portion 45t (metal portion 45b) of the shaft core 45 by, for example, a lead (a metal connection member, not shown). It is connected to the.

電池ケース６０は、円筒型の電池ケースであり、有底円筒状をなす金属製のケース本体６１と、円板状をなす金属製の蓋部材６２とを有する（図１参照）。蓋部材６２は、ケース本体６１の開口６１ｊを塞ぐように配置され、開口６１ｊを構成する開口部６１ｈの加締めによって、ケース本体６１に固定されている。なお、蓋部材６２と開口部６１ｈとの間には、電気絶縁性樹脂からなる円環状のガスケット６９が配置されている。これにより、ケース本体６１と蓋部材６２との間を電気的に絶縁しつつ、捲回電極体４０を収容したケース本体６１と蓋部材６２とが一体とされて、電池ケース６０をなしている。   The battery case 60 is a cylindrical battery case and includes a metal case body 61 having a bottomed cylindrical shape and a metal lid member 62 having a disk shape (see FIG. 1). The lid member 62 is disposed so as to close the opening 61j of the case main body 61, and is fixed to the case main body 61 by crimping the opening 61h constituting the opening 61j. An annular gasket 69 made of an electrically insulating resin is disposed between the lid member 62 and the opening 61h. As a result, the case body 61 and the lid member 62 that house the wound electrode body 40 are integrated with each other while electrically insulating the case body 61 and the lid member 62 to form the battery case 60. .

蓋部材６２は、軸芯４５の突出部４５ｔが挿入される挿入孔６２ｂを有する（図３及び図４参照）。挿入孔６２ｂは、図３に示すように、平面視細長形状をなす長孔である。この挿入孔６２ｂは、挿入孔６２ｂに軸芯４５の突出部４５ｔを挿入したときに、挿入孔６２ｂ内において、突出部４５ｔと蓋部材６２とが、挿入孔６２ｂの短手方向（図３において左右方向）について近接または接触し、挿入孔６２ｂの長手方向（図３において上下方向）については短手方向に比べて大きく離間する寸法を有している。なお、図３には、挿入孔６２ｂ内に挿入した突出部４５ｔを、二点差線で示している。   The lid member 62 has an insertion hole 62b into which the protruding portion 45t of the shaft core 45 is inserted (see FIGS. 3 and 4). As shown in FIG. 3, the insertion hole 62b is a long hole having an elongated shape in plan view. When the protrusion 45t of the shaft core 45 is inserted into the insertion hole 62b, the insertion hole 62b is formed so that the protrusion 45t and the lid member 62 are arranged in the short direction of the insertion hole 62b (in FIG. 3). (The left and right direction) are close to or in contact with each other, and the longitudinal direction (vertical direction in FIG. 3) of the insertion hole 62b has a dimension that is far away from the short direction. In FIG. 3, the protrusion 45t inserted into the insertion hole 62b is indicated by a two-dot chain line.

詳細には、挿入孔６２ｂの短手方向の寸法Ｌ１（図３参照）を、円筒形状の突出部４５ｔの外径Ｄ１（図２参照）よりも僅かに大きくしている。一方、挿入孔６２ｂの長手方向（図３において上下方向）の寸法Ｌ２は、短手方向の寸法Ｌ１の２倍（従って、突出部４５ｔの外径Ｄ１の２倍以上）の大きさとしている。   Specifically, the dimension L1 (see FIG. 3) in the short direction of the insertion hole 62b is slightly larger than the outer diameter D1 (see FIG. 2) of the cylindrical protrusion 45t. On the other hand, the dimension L2 in the longitudinal direction (vertical direction in FIG. 3) of the insertion hole 62b is twice as large as the dimension L1 in the short direction (and therefore more than twice the outer diameter D1 of the protrusion 45t).

蓋部材６２の挿入孔６２ｂを上述のような形状（寸法）とすることで、後述するように、本実施例１の電池１を製造するとき（詳細には、後述の配置工程において）、捲回電極体４０と共にケース本体６１の内部に収容した軸芯４５が、ケース本体６１の軸線ＡＸ２に対し傾いていたり軸ズレしている場合（図１３及び図１４参照）でも、軸芯４５の突出部４５ｔを蓋部材６２の挿入孔６２ｂに挿入して、適切に、蓋部材６２をケース本体６１の開口６１ｊの内側に配置することができる。   By forming the insertion hole 62b of the lid member 62 into the shape (dimensions) as described above, as will be described later, when the battery 1 of the first embodiment is manufactured (specifically, in the arrangement step described later), Even when the shaft core 45 accommodated in the case body 61 together with the rotating electrode body 40 is inclined or misaligned with respect to the axis AX2 of the case body 61 (see FIGS. 13 and 14), the shaft core 45 protrudes. The portion 45t can be inserted into the insertion hole 62b of the lid member 62, and the lid member 62 can be appropriately disposed inside the opening 61j of the case body 61.

さらに、本実施例１の電池１では、蓋部材６２の挿入孔６２ｂに挿入された軸芯４５の突出部４５ｔのうち、挿入孔６２ｂの短手方向（図１において左右方向）について蓋部材６２と近接または接触する部位が、蓋部材６２と溶接されている。このように、軸芯４５の突出部４５ｔと蓋部材６２とを溶接して、両者を電気的に接続しているので、両者の間の電気抵抗を小さくすることができる。なお、図１では、蓋部材６２と軸芯４５の突出部４５ｔとが溶接されている部位を、溶接部Ｗ（図１において黒く塗りつぶされている部位）としている。   Further, in the battery 1 according to the first embodiment, the lid member 62 in the short direction (left and right direction in FIG. 1) of the insertion hole 62b among the protrusions 45t of the shaft core 45 inserted into the insertion hole 62b of the lid member 62. A portion in proximity to or in contact with the lid member 62 is welded. Thus, since the protrusion part 45t of the axial core 45 and the cover member 62 are welded and both are electrically connected, the electrical resistance between both can be made small. In FIG. 1, a portion where the lid member 62 and the protruding portion 45 t of the shaft core 45 are welded is a welded portion W (a portion painted black in FIG. 1).

また、蓋部材６２の外面中央には、軸線方向後端側に窪んだ円形の凹部６２ｃが形成されている（図３及び図４参照）。この凹部６２ｃの表面には、略円板状の安全弁６３が溶接されている（図１参照）。この安全弁６３により、蓋部材６２の挿入孔６２ｂ及び軸芯４５の先端側開口４５ｋが閉塞される。この安全弁６３は、電池１の内圧（電池ケース６０の内圧）が上昇して所定値に達した場合に、自身が壊裂するように形成されている。これにより、電池１内（電池ケース６０内）のガスを、安全に外部に排出して、電池１の内圧（電池ケース６０の内圧）の過昇圧を防止することができる。
なお、本実施例１の電池１では、蓋部材６２（安全弁６３を含む）が正極外部端子となる。 In addition, a circular recess 62c that is recessed toward the rear end in the axial direction is formed at the center of the outer surface of the lid member 62 (see FIGS. 3 and 4). A substantially disc-shaped safety valve 63 is welded to the surface of the recess 62c (see FIG. 1). The safety valve 63 closes the insertion hole 62b of the lid member 62 and the distal end side opening 45k of the shaft core 45. The safety valve 63 is formed such that the safety valve 63 itself bursts when the internal pressure of the battery 1 (internal pressure of the battery case 60) increases and reaches a predetermined value. Thereby, the gas in the battery 1 (in the battery case 60) can be safely discharged to the outside, and an excessive increase in the internal pressure of the battery 1 (internal pressure of the battery case 60) can be prevented.
In the battery 1 of the first embodiment, the lid member 62 (including the safety valve 63) serves as a positive electrode external terminal.

さらに、本実施例１の電池１は、蓋部材６２と捲回電極体４０との間に位置し、捲回電極体４０のうち蓋部材６２側（図１において上側）の端部（正極捲回部４４を含む軸線方向先端側端部４０ｂ）を覆う被覆部材６８を備えている。被覆部材６８は、電気絶縁性の樹脂からなり、図５及び図６に示すように、略円筒状をなし、軸芯４５の突出部４５ｔを挿通させる挿通孔６８ｂを有している。この被覆部材６８は、自身の挿通孔６８ｂに軸芯４５の突出部４５ｔを挿通させた状態で、捲回電極体４０の軸線方向先端側端部４０ｂ（蓋部材６２側の端部）を覆っている。   Furthermore, the battery 1 of the first embodiment is located between the lid member 62 and the wound electrode body 40, and the end (positive electrode winding) of the wound electrode body 40 on the lid member 62 side (upper side in FIG. 1). A covering member 68 is provided to cover the end 40b in the axial direction including the turning portion 44). The covering member 68 is made of an electrically insulating resin, has a substantially cylindrical shape, and has an insertion hole 68b through which the protruding portion 45t of the shaft core 45 is inserted, as shown in FIGS. The covering member 68 covers the end 40b (end on the lid member 62 side) in the axial direction of the wound electrode body 40 in a state where the protruding portion 45t of the shaft core 45 is inserted into the insertion hole 68b. ing.

このように、被覆部材６８によって捲回電極体４０の軸線方向先端側端部４０ｂ（蓋部材６２側の端部）を覆うことで、後述するように、本実施例１の電池１の製造時に（後述の溶接工程において）、軸芯４５の突出部４５ｔと蓋部材６２とを溶接したときに発生したスパッタが、捲回電極体４０の内部に進入するのを防止することができる。従って、本実施例１の電池１は、スパッタによる捲回電極体４０の内部短絡等が防止された電池となる。   Thus, by covering the axial direction front end side end portion 40b (end portion on the lid member 62 side) of the wound electrode body 40 with the covering member 68, as described later, at the time of manufacturing the battery 1 of the first embodiment. It is possible to prevent spatter generated when the protrusion 45t of the shaft core 45 and the lid member 62 are welded (in a welding process described later) from entering the wound electrode body 40. Therefore, the battery 1 of Example 1 is a battery in which the internal short circuit of the wound electrode body 40 due to sputtering is prevented.

また、負極捲回部４６（負極活物質未塗工部２３）は、その端面４６ｂにおいて、略円板状をなす金属製の負極集電部材７２に溶接されている（図１参照）。さらに、負極集電部材７２は、ケース本体６１の底部６１ｂに溶接されている。これにより、本実施例１の電池１では、ケース本体６１の底部６１ｂが負極外部端子となる。   Moreover, the negative electrode winding part 46 (negative electrode active material uncoated part 23) is welded to the metal negative electrode current collection member 72 which makes the substantially disk shape in the end surface 46b (refer FIG. 1). Further, the negative electrode current collecting member 72 is welded to the bottom portion 61 b of the case main body 61. Thereby, in the battery 1 of the first embodiment, the bottom 61b of the case body 61 serves as a negative external terminal.

次に、実施例１にかかる電池１の製造方法について、以下に説明する。
まず、図７に示すように、帯状の正極集電箔１１の表面に正極合材層１２を形成した正極板１０を用意する。この正極板１０は、正極集電箔１１が延びる長手方向（図７において左右方向）の一方辺１０ｂに沿って延び、正極集電箔１１及び正極合材層１２を有する正極活物質塗工部１４と、この正極活物質塗工部１４と隣り合って長手方向の一方辺１０ｂに沿って延び、正極合材層１２を有することなく、正極集電箔１１のみからなる正極活物質未塗工部１３とを有している。 Next, the manufacturing method of the battery 1 according to Example 1 will be described below.
First, as shown in FIG. 7, a positive electrode plate 10 in which a positive electrode mixture layer 12 is formed on the surface of a strip-shaped positive electrode current collector foil 11 is prepared. The positive electrode plate 10 extends along one side 10b in the longitudinal direction (left and right direction in FIG. 7) in which the positive electrode current collector foil 11 extends, and has a positive electrode current collector foil 11 and a positive electrode mixture layer 12. 14 and the positive electrode active material coating portion 14, which is adjacent to the positive electrode active material coating portion 14 and extends along the one side 10 b in the longitudinal direction, and does not have the positive electrode mixture layer 12, and is composed only of the positive electrode current collector foil 11. Part 13.

さらに、図８に示すように、帯状の負極集電箔２１の表面に負極合材層２２を形成した負極板２０を用意する。この負極板２０は、負極集電箔２１が延びる長手方向（図８において左右方向）の一方辺２０ｂに沿って延び、負極集電箔２１及び負極合材層２２を有する負極活物質塗工部２４と、この負極活物質塗工部２４と隣り合って長手方向の一方辺２０ｂに沿って延び、負極合材層２２を有することなく、負極集電箔２１のみからなる負極活物質未塗工部２３とを有している。   Furthermore, as shown in FIG. 8, a negative electrode plate 20 in which a negative electrode mixture layer 22 is formed on the surface of a strip-shaped negative electrode current collector foil 21 is prepared. The negative electrode plate 20 extends along one side 20b in the longitudinal direction (left-right direction in FIG. 8) in which the negative electrode current collector foil 21 extends, and has a negative electrode current collector foil 21 and a negative electrode mixture layer 22. 24 and the negative electrode active material coating part 24, which extends along the one side 20 b in the longitudinal direction and does not have the negative electrode mixture layer 22, and is composed only of the negative electrode current collector foil 21. Part 23.

次に、積層工程において、負極板２０、セパレータ３０、正極板１０、及びセパレータ３０を、この順に積層する（図９参照）。具体的には、正極板１０の正極活物質未塗工部１３と負極板２０の負極活物質未塗工部２３が、幅方向（図９において上下方向）で互いに背向する向きで、正極活物質未塗工部１３がセパレータ３０及び負極板２０と重なり合わないように、且つ、負極活物質未塗工部２３がセパレータ３０及び正極板１０と重なり合わないように積層する。   Next, in the stacking step, the negative electrode plate 20, the separator 30, the positive electrode plate 10, and the separator 30 are stacked in this order (see FIG. 9). Specifically, the positive electrode active material uncoated portion 13 of the positive electrode plate 10 and the negative electrode active material uncoated portion 23 of the negative electrode plate 20 are oriented so that they face each other in the width direction (vertical direction in FIG. 9). Lamination is performed so that the active material uncoated portion 13 does not overlap the separator 30 and the negative electrode plate 20, and the negative electrode active material uncoated portion 23 does not overlap the separator 30 and the positive electrode plate 10.

次いで、捲回工程に進み、図９に示すように、負極板２０、正極板１０、及びセパレータ３０を積層した積層体４０Ａを、円筒状の軸芯４５の周りに捲回する。これにより、円筒形状の捲回電極体４０を形成することができる。なお、本実施例１では、積層体４０Ａを、軸芯４５の周りに５０回捲回した。
その後、負極捲回部４６に負極集電部材７２を溶接した。具体的には、負極集電部材７２に、負極捲回部４６の端面４６ｂを突き当てた状態で、負極集電部材７２の表面にレーザービームを照射して、負極捲回部４６と負極集電部材７２とをレーザ溶接した。 Next, the process proceeds to a winding step, and as shown in FIG. 9, the laminated body 40 </ b> A in which the negative electrode plate 20, the positive electrode plate 10, and the separator 30 are stacked is wound around a cylindrical shaft core 45. Thereby, the cylindrical wound electrode body 40 can be formed. In Example 1, the laminated body 40A was wound around the shaft core 45 50 times.
Thereafter, the negative electrode current collecting member 72 was welded to the negative electrode winding part 46. Specifically, in a state where the end face 46b of the negative electrode winding part 46 is abutted against the negative electrode current collector member 72, the surface of the negative electrode current collector member 72 is irradiated with a laser beam, so that the negative electrode winding part 46 and the negative electrode current collector are separated. The electric member 72 was laser welded.

次に、収容工程に進み、図１０に示すように、軸芯４５の外周に捲回してなる捲回電極体４０を、軸芯４５と共にケース本体６１の内部に収容する。なお、このとき、負極捲回部４６に溶接されている負極集電部材７２は、ケース本体６１の底部６１ｂに接する。その後、負極集電部材７２をケース本体６１の底部６１ｂに溶接する。具体的には、ケース本体６１の底部６１ｂの外表面にレーザービームを照射して、負極集電部材７２とケース本体６１の底部６１ｂとをレーザ溶接した。これにより、ケース本体６１の底部６１ｂが負極外部端子となる。   Next, the process proceeds to the housing step, and the wound electrode body 40 wound around the outer periphery of the shaft core 45 is housed inside the case body 61 together with the shaft core 45 as shown in FIG. At this time, the negative electrode current collecting member 72 welded to the negative electrode winding portion 46 is in contact with the bottom portion 61 b of the case body 61. Thereafter, the negative electrode current collector 72 is welded to the bottom 61 b of the case body 61. Specifically, the outer surface of the bottom 61 b of the case body 61 was irradiated with a laser beam, and the negative electrode current collector 72 and the bottom 61 b of the case body 61 were laser welded. Thereby, the bottom 61b of the case body 61 becomes a negative external terminal.

次いで、被覆工程に進み、図１１に示すように、被覆部材６８により、捲回電極体４０の軸線方向先端側端部４０ｂを覆う。具体的には、捲回電極体４０が捲回されてなる軸芯４５の突出部４５ｔを、被覆部材６８の挿通孔６８ｂに挿通させつつ、捲回電極体４０の軸線方向先端側端部４０ｂに被覆部材６８を配置する。このようにして、被覆部材６８によって捲回電極体４０の軸線方向先端側端部４０ｂを覆う（正極捲回部４４の間隙Ｓ１を閉塞する）ことができる。これにより、後の溶接工程において、軸芯４５の突出部４５ｔと蓋部材６２とを溶接したときにスパッタが発生（飛散）した場合には、被覆部材６８により、発生したスパッタが（正極捲回部４４の間隙Ｓ１を通過して）捲回電極体４０の内部に進入するのを防止することができる。   Next, the process proceeds to a covering step, and as shown in FIG. 11, the axially distal end side end 40 b of the wound electrode body 40 is covered by the covering member 68. Specifically, the protruding portion 45 t of the shaft core 45 formed by winding the wound electrode body 40 is inserted into the insertion hole 68 b of the covering member 68, and the distal end side end 40 b in the axial direction of the wound electrode body 40. The covering member 68 is disposed on the surface. In this way, the covering member 68 can cover the end 40b in the axial direction of the wound electrode body 40 (close the gap S1 of the positive wound portion 44). Thereby, in the subsequent welding process, when spatter is generated (scattered) when the protrusion 45t of the shaft core 45 and the lid member 62 are welded, the generated spatter is generated by the covering member 68 (positive winding). It is possible to prevent entry into the wound electrode body 40 (through the gap S1 of the portion 44).

次に、図１２に示すように、ケース本体６１の軸線方向先端側（図１２において上側）の一部を、ケース本体６１の全周にわたって径方向内側（軸線ＡＸ２側）に変形させて、環状段部６１ｋを形成する。その後、開口部６１ｈの内側に、円環状のガスケット６９を配置する。なお、ガスケット６９は、環状段部６１ｋ上に載置されることで、ケース本体６１に対し位置決めされる。   Next, as shown in FIG. 12, a part of the case body 61 on the tip end side in the axial direction (upper side in FIG. 12) is deformed radially inward (axis AX <b> 2 side) over the entire circumference of the case body 61. A step portion 61k is formed. Thereafter, an annular gasket 69 is disposed inside the opening 61h. The gasket 69 is positioned with respect to the case body 61 by being placed on the annular step portion 61k.

次いで、配置工程に進み、図１２に示すように、蓋部材６２の挿入孔６２ｂに軸芯４５の突出部４５ｔを挿入させるようにして、蓋部材６２をケース本体６１の開口６１ｊの内側（詳細には、ガスケット６９の内側）に配置する。なお、蓋部材６２は、ガスケット６９の段差部６９ｂ上に載置されることで、ケース本体６１に対し位置決めされる。   Next, the process proceeds to an arrangement step, and as shown in FIG. 12, the protrusion 45t of the shaft core 45 is inserted into the insertion hole 62b of the cover member 62 so that the cover member 62 is located inside the opening 61j of the case body 61 (details). Is disposed inside the gasket 69. The lid member 62 is positioned with respect to the case main body 61 by being placed on the stepped portion 69 b of the gasket 69.

ところで、捲回電極体４０と共にケース本体６１の内部に収容された軸芯４５（その軸線ＡＸ３）が、ケース本体６１の軸線ＡＸ２に対し傾いたり軸ズレした状態となることがある。すなわち、収容工程において、軸芯４５（その軸線ＡＸ３）が、ケース本体６１の軸線ＡＸ２に対し傾いたり軸ズレした状態で、ケース本体６１内に収容されることがある。
このような場合、従来の電池（例えば、特許文献１のように蓋部の挿入孔が平面視円形状である電池）の製造方法では、軸芯の突出部を蓋部材の挿入孔に挿入して、蓋部材をケース本体の開口の内側に配置（挿入）しようとしても、適切に、蓋部材をケース本体の開口の内側に配置することができないことがあった。 By the way, the shaft core 45 (its axis AX3) housed in the case body 61 together with the wound electrode body 40 may be inclined or misaligned with respect to the axis AX2 of the case body 61. That is, in the housing step, the shaft core 45 (its axis AX3) may be housed in the case body 61 in a state where the shaft core 45 is inclined or misaligned with respect to the axis AX2 of the case body 61.
In such a case, in a conventional battery manufacturing method (for example, a battery in which the insertion hole of the lid is circular in plan view as in Patent Document 1), the protruding portion of the shaft core is inserted into the insertion hole of the lid member. Even if the lid member is arranged (inserted) inside the opening of the case body, the lid member may not be properly arranged inside the opening of the case body.

具体的には、図２０に示すように、軸芯３４５（その軸線ＡＸ３）がケース本体３６１の軸線ＡＸ２に対し傾いている場合、軸芯３４５の突出部３４５ｔを蓋部材３６２の挿入孔３６２ｂに挿入するようにして、蓋部材３６２をケース本体３６１の開口３６１ｊの内側（詳細には、ガスケット３６９の内側）に配置しようとしても、軸芯３４５の突出部３４５ｔが蓋部材３６２に衝突してしまい、軸芯３４５の突出部３４５ｔを蓋部材３６２の挿入孔３６２ｂに挿入できなかった。このため、蓋部材３６２を、ケース本体３６１の開口３６１ｊの内側の所定位置（詳細には、ガスケット３６９の段差部３６９ｂに接触する位置）に配置することができなかった。また、図２１に示すように、軸芯３４５（その軸線ＡＸ３）がケース本体３６１の軸線ＡＸ２に対し軸ズレしている場合も、これと同様であった。   Specifically, as shown in FIG. 20, when the shaft core 345 (its axis AX3) is inclined with respect to the axis AX2 of the case main body 361, the protrusion 345t of the shaft 345 is inserted into the insertion hole 362b of the lid member 362. Even if the lid member 362 is placed inside the opening 361j of the case body 361 (specifically, inside the gasket 369) so as to be inserted, the protruding portion 345t of the shaft core 345 collides with the lid member 362. The protrusion 345t of the shaft core 345 could not be inserted into the insertion hole 362b of the lid member 362. For this reason, the lid member 362 cannot be disposed at a predetermined position inside the opening 361j of the case main body 361 (specifically, a position in contact with the stepped portion 369b of the gasket 369). Further, as shown in FIG. 21, the same was true when the axis 345 (its axis AX3) was misaligned with the axis AX2 of the case main body 361.

これに対し、本実施例１では、前述のように、蓋部材６２の挿入孔６２ｂを、平面視細長形状をなす長孔としている（図３参照）。この挿入孔６２ｂは、自身に軸芯４５の突出部４５ｔを挿入したときに、挿入孔６２ｂ内において、突出部４５ｔと蓋部材６２とが、挿入孔６２ｂの短手方向（図３において左右方向）について近接または接触する一方、挿入孔６２ｂの長手方向（図３において上下方向）については短手方向に比べて大きく離間する寸法を有している。詳細には、挿入孔６２ｂの短手方向の寸法Ｌ１（図３参照）を、円筒形状の突出部４５ｔの外径Ｄ１（図２参照）よりも僅かに大きくしている。一方、挿入孔６２ｂの長手方向（図３において上下方向）の寸法Ｌ２を、短手方向の寸法Ｌ１の２倍の大きさ（従って、突出部４５ｔの外径Ｄ１の２倍以上）の大きさとしている。   On the other hand, in the first embodiment, as described above, the insertion hole 62b of the lid member 62 is a long hole having an elongated shape in plan view (see FIG. 3). When the protrusion 45t of the shaft core 45 is inserted into the insertion hole 62b, the protrusion 45t and the lid member 62 are arranged in the short direction of the insertion hole 62b (the horizontal direction in FIG. 3). ) In the vicinity of or in contact with each other, the longitudinal direction (vertical direction in FIG. 3) of the insertion hole 62b has a dimension that is far away from the short direction. Specifically, the dimension L1 (see FIG. 3) in the short direction of the insertion hole 62b is slightly larger than the outer diameter D1 (see FIG. 2) of the cylindrical protrusion 45t. On the other hand, the dimension L2 in the longitudinal direction (vertical direction in FIG. 3) of the insertion hole 62b is twice as large as the dimension L1 in the short side direction (and therefore more than twice the outer diameter D1 of the protrusion 45t). It is said.

これにより、捲回電極体４０と共にケース本体６１の内部に収容した軸芯４５（その軸線ＡＸ３）が、ケース本体６１の軸線ＡＸ２に対し傾いていたり軸ズレしている場合（図１３及び図１４参照）でも、軸芯４５の突出部４５ｔを蓋部材６２の挿入孔６２ｂに挿入して、適切に、蓋部材６２をケース本体６１の開口６１ｊの内側に配置することができる。   As a result, the axial core 45 (its axis AX3) housed inside the case main body 61 together with the wound electrode body 40 is inclined or misaligned with respect to the axis AX2 of the case main body 61 (FIGS. 13 and 14). However, the protrusion 45t of the shaft core 45 can be inserted into the insertion hole 62b of the lid member 62, and the lid member 62 can be appropriately disposed inside the opening 61j of the case body 61.

具体的には、図１３に示すように、軸芯４５（その軸線ＡＸ３）がケース本体６１の軸線ＡＸ２に対し傾いている場合は、軸芯４５の傾き方向（図１３において左右方向）に挿入孔６２ｂの長手方向（図１３において左右方向）を合わせて、軸芯４５の突出部４５ｔを蓋部材６２の挿入孔６２ｂに挿入することで、適切に、蓋部材６２をケース本体６１の開口６１ｊの内側（詳細には、ガスケット６９の内側）に配置することができる。詳細には、ケース本体６１の軸線ＡＸ２に対し傾いている軸芯４５の突出部４５ｔが蓋部材６２に衝突して挿入孔６２ｂ内への突出部４５ｔの挿入が妨げられないように、軸芯４５の突出部４５ｔを挿入孔６２ｂの長手方向（図１３において左右方向）に逃がすように挿入孔６２ｂに挿入する。これにより、蓋部材６２を、ケース本体６１の開口６１ｊの内側（詳細には、ガスケット６９の内側）の所定位置（ガスケット６９の段差部６９ｂに接触する位置）に、適切に配置することができる。   Specifically, as shown in FIG. 13, when the shaft core 45 (its axis AX3) is tilted with respect to the axis AX2 of the case body 61, the shaft core 45 is inserted in the tilt direction (left and right in FIG. 13). By aligning the longitudinal direction of the hole 62b (left and right direction in FIG. 13) and inserting the protruding portion 45t of the shaft core 45 into the insertion hole 62b of the lid member 62, the lid member 62 is appropriately inserted into the opening 61j of the case body 61. (In detail, inside the gasket 69). More specifically, the shaft core is provided so that the protrusion 45t of the shaft core 45 inclined with respect to the axis AX2 of the case body 61 does not interfere with the lid member 62 and the insertion of the protrusion 45t into the insertion hole 62b is not hindered. 45 protrusions 45t are inserted into the insertion holes 62b so as to escape in the longitudinal direction of the insertion holes 62b (left and right in FIG. 13). Accordingly, the lid member 62 can be appropriately disposed at a predetermined position (a position that contacts the stepped portion 69b of the gasket 69) inside the opening 61j of the case main body 61 (specifically, inside the gasket 69). .

また、図１４に示すように、軸芯４５（その軸線ＡＸ３）がケース本体６１の軸線ＡＸ２に対し軸ズレしている場合も、軸芯４５のズレ方向（図１４において左右方向）に挿入孔６２ｂの長手方向（図１４において左右方向）を合わせて、軸芯４５の突出部４５ｔを蓋部材６２の挿入孔６２ｂに挿入することで、適切に、蓋部材６２をケース本体６１の開口６１ｊの内側（詳細には、ガスケット６９の内側）の所定位置（ガスケット６９の段差部６９ｂに接触する位置）に配置することができる。   As shown in FIG. 14, even when the shaft core 45 (its axis AX3) is misaligned with respect to the axis AX2 of the case main body 61, the insertion hole is inserted in the misalignment direction (the left-right direction in FIG. 14) of the shaft core 45. The protrusions 45t of the shaft core 45 are inserted into the insertion holes 62b of the lid member 62 by aligning the longitudinal direction of the 62b (left and right direction in FIG. 14), so that the lid member 62 is appropriately inserted into the opening 61j of the case body 61. It can be arranged at a predetermined position on the inner side (specifically, on the inner side of the gasket 69) (a position where it contacts the stepped portion 69b of the gasket 69).

次に、溶接工程に進み、蓋部材６２の挿入孔６２ｂに挿入された軸芯４５の突出部４５ｔのうち、挿入孔６２ｂの短手方向（図１５において左右方向）について蓋部材６２と近接または接触する部位を、蓋部材６２と溶接する。具体的には、図１５に示すように、蓋部材６２の外側から、挿入孔６２ｂの短手方向（図１５において左右方向）について軸芯４５の突出部４５ｔと蓋部材６２とが互いに近接または接触する位置（軸芯４５の径方向に対向する２箇所）にレーザービームＬＢを照射して、蓋部材６２と軸芯４５（突出部４５ｔ）とをレーザー溶接する。このように、軸芯４５の突出部４５ｔと蓋部材６２（正極外部端子）とを溶接して、両者を電気的に接続することで、両者の間の電気抵抗を小さくすることができる。   Next, it progresses to a welding process and it adjoins with the cover member 62 about the transversal direction (left-right direction in FIG. 15) of the insertion hole 62b among the protrusion parts 45t of the axial core 45 inserted in the insertion hole 62b of the cover member 62, or The contact portion is welded to the lid member 62. Specifically, as shown in FIG. 15, from the outside of the lid member 62, the protrusion 45t of the shaft 45 and the lid member 62 are close to each other in the short direction of the insertion hole 62b (the left-right direction in FIG. 15). The laser beam LB is irradiated to the contact position (two locations facing the radial direction of the shaft core 45), and the lid member 62 and the shaft core 45 (projecting portion 45t) are laser welded. Thus, the electrical resistance between both can be made small by welding the protrusion part 45t of the shaft core 45, and the cover member 62 (positive electrode external terminal), and electrically connecting both.

ところで、上述のように軸芯４５の突出部４５ｔと蓋部材６２とを溶接したとき、スパッタが発生（飛散）することがある。このスパッタが、正極捲回部４４の間隙Ｓ１を通じて捲回電極体４０の内部に進入した場合には、スパッタによって捲回電極体４０の内部短絡（スパッタを通じた正極板１０と負極板２０との電気的接続など）が生じる虞がある。   By the way, when the protrusion 45t of the shaft core 45 and the lid member 62 are welded as described above, spatter may be generated (scattered). When this sputter enters the inside of the wound electrode body 40 through the gap S1 of the positive electrode winding portion 44, an internal short circuit of the wound electrode body 40 due to the sputtering (the positive electrode plate 10 and the negative electrode plate 20 through the sputter). There is a risk of electrical connection).

しかしながら、本実施例１では、前述のように、先の被覆工程において、被覆部材６８により、捲回電極体４０の軸線方向先端側端部４０ｂ（正極捲回部４４を含む部位）を覆っている（正極捲回部４４の間隙Ｓ１を閉塞している）。これにより、溶接工程において、軸芯４５の突出部４５ｔと蓋部材６２とを溶接したときにスパッタが発生（飛散）した場合には、被覆部材６８により、発生したスパッタが（正極捲回部４４の間隙Ｓ１を通過して）捲回電極体４０の内部に進入するのを防止することができる。従って、スパッタ
による捲回電極体４０の内部短絡を抑制することができる。 However, in the first embodiment, as described above, in the previous covering step, the covering member 68 covers the end 40b in the axial direction of the wound electrode body 40 (the portion including the positive electrode wound portion 44). (The gap S1 of the positive electrode winding part 44 is closed). Thereby, in the welding process, when spatter is generated (scattered) when the projecting portion 45t of the shaft core 45 and the lid member 62 are welded, the generated spatter is generated by the covering member 68 (positive electrode winding portion 44). Can be prevented from entering the inside of the wound electrode body 40 (through the gap S1). Therefore, an internal short circuit of the wound electrode body 40 due to sputtering can be suppressed.

次いで、ケース本体６１の開口６１ｊを構成する開口部６１ｈを加締めて、ガスケット６９と共に蓋部材６２を、ケース本体６１に固定する（図１参照）。これにより、ケース本体６１と蓋部材６２との間をガスケット６９によって電気的に絶縁しつつ、ケース本体６１と蓋部材６２とが一体とされて、電池ケース６０が形成される。その後、軸芯４５の先端側開口４５ｋを通じて、ケース本体６１の内部に電解液を注入する。その後、蓋部材６２の凹部６２ｃの表面に、安全弁６３を全周溶接する。これにより、蓋部材６２の挿入孔６２ｂ及び軸芯４５の先端側開口４５ｋが閉塞され、密閉型の電池１が完成する。   Next, the opening 61h constituting the opening 61j of the case main body 61 is crimped, and the lid member 62 is fixed to the case main body 61 together with the gasket 69 (see FIG. 1). Thus, the battery case 60 is formed by integrating the case body 61 and the lid member 62 while electrically insulating the case body 61 and the lid member 62 by the gasket 69. Thereafter, an electrolytic solution is injected into the case main body 61 through the tip side opening 45k of the shaft core 45. Thereafter, the safety valve 63 is welded to the entire surface of the recess 62 c of the lid member 62. As a result, the insertion hole 62b of the lid member 62 and the tip side opening 45k of the shaft core 45 are closed, and the sealed battery 1 is completed.

（実施例２）
次に、実施例２にかかる電池１００について説明する。本実施例２の電池１００は、実施例１の電池１と比較して、被覆部材を有しない点と軸芯の形状とが異なり、その他については実施例１と同様である。従って、ここでは、実施例１と異なる点を中心に説明し、同様な点については説明を省略または簡略化する。 (Example 2)
Next, the battery 100 according to Example 2 will be described. The battery 100 of the second embodiment is different from the battery 1 of the first embodiment in that it does not have a covering member and the shape of the shaft core, and is otherwise the same as the first embodiment. Therefore, here, the description will focus on the points different from the first embodiment, and the description of the same points will be omitted or simplified.

図１６は、実施例２にかかる電池１００の縦断面図（軸線ＡＸ１に沿って切断した断面図）である。本実施例２の電池１００は、実施例１の軸芯４５に代えて、軸芯１４５を備えている。また、実施例１の電池１と異なり、被覆部材６８を備えていない。なお、捲回電極体４０は、捲回数５０の捲回電極体であるが、図１６等では、捲回電極体４０の巻数を簡略化（５回巻に簡略化）している。   FIG. 16 is a vertical cross-sectional view (cross-sectional view cut along the axis AX1) of the battery 100 according to the second embodiment. The battery 100 according to the second embodiment includes a shaft core 145 instead of the shaft core 45 according to the first embodiment. Further, unlike the battery 1 of the first embodiment, the covering member 68 is not provided. The wound electrode body 40 is a wound electrode body having a number of winding times of 50, but in FIG. 16 and the like, the number of turns of the wound electrode body 40 is simplified (simplified to 5 turns).

軸芯１４５は、実施例１の軸芯４５と同様に、金属（例えば、アルミニウム）からなる金属部４５ｂと、樹脂（例えば、ポリプロピレン）からなる樹脂部４５ｆとを有している（図１７参照）。しかしながら、本実施例２の軸芯１４５では、金属部４５ｂの外周面に、円環状の鍔部１４５ｄが溶接されている。これにより、本実施例２の軸芯１４５では、突出部１４５ｔ（軸芯１４５のうち、捲回電極体４０から軸線方向先端側（図１６において上側）に突出する部位）が、自身の径方向外側に突出した円環状の鍔部１４５ｄを有する。   The shaft core 145 includes a metal portion 45b made of metal (for example, aluminum) and a resin portion 45f made of resin (for example, polypropylene), like the shaft core 45 of the first embodiment (see FIG. 17). ). However, in the shaft core 145 of the second embodiment, an annular flange portion 145d is welded to the outer peripheral surface of the metal portion 45b. As a result, in the shaft core 145 of the second embodiment, the protruding portion 145t (the portion of the shaft core 145 that protrudes from the wound electrode body 40 toward the distal end side in the axial direction (the upper side in FIG. 16)) is the radial direction of itself. An annular flange 145d protruding outward is provided.

また、蓋部材６２は、軸芯１４５の突出部１４５ｂのうち鍔部１４５ｄよりも軸線方向先端側（図１６において上側）の部位を挿入孔６２ｂに挿入させた状態で、鍔部１４５ｄに対し軸線方向先端側に配置され、鍔部１４５ｄが位置する側とは反対側（図１６において蓋部材６２の上側）で突出部１４５ｔと溶接されている。なお、図１６では、蓋部材６２と突出部１４５ｔとが溶接されている部位を、溶接部Ｗ（図１６において黒く塗りつぶされている部位）としている。   Further, the lid member 62 has an axial line with respect to the flange 145d in a state in which a portion of the protruding portion 145b of the shaft core 145 that is on the distal end side in the axial direction (upper side in FIG. 16) is inserted into the insertion hole 62b. It arrange | positions at the direction front end side, and is welded with the protrusion part 145t on the opposite side (upper side of the cover member 62 in FIG. 16) to the side where the collar part 145d is located. In FIG. 16, a portion where the lid member 62 and the protruding portion 145 t are welded is a welded portion W (portion that is painted black in FIG. 16).

軸芯１４５の突出部１４５ｔのうち鍔部１４５ｄよりも軸線方向先端側の部位を挿入孔６２ｂに挿入して、蓋部材６２を、鍔部１４５ｄに対し軸線方向先端側（捲回電極体４０が位置する側とは反対側）に配置する（鍔部１４５ｄよりも軸線方向先端側に蓋部材６２を配置する）ことで、蓋部材６２に対し捲回電極体側（軸線方向後端側）の位置で、蓋部材６２の挿入孔６２ｂの一部または全部（本実施例２では全部）を、軸芯１４５の鍔部１４５ｄによって塞ぐことができる（図１９参照）。   A portion of the projecting portion 145t of the shaft core 145 that is closer to the distal end side in the axial direction than the flange portion 145d is inserted into the insertion hole 62b, and the lid member 62 is moved to the distal end side in the axial direction with respect to the flange portion 145d. The position on the wound electrode body side (the rear end side in the axial direction) with respect to the lid member 62 by disposing it on the side opposite to the position where the lid member 62 is disposed (on the front end side in the axial direction with respect to the flange portion 145d). Thus, a part or all (all in the second embodiment) of the insertion hole 62b of the lid member 62 can be closed by the flange portion 145d of the shaft core 145 (see FIG. 19).

本実施例２では、後述するように、この状態（蓋部材６２の挿入孔６２ｂを軸芯１４５の鍔部１４５ｄで塞いだ状態）で、蓋部材６２について鍔部１４５ｄが位置する側とは反対側（軸線方向先端側）で、蓋部材６２と軸芯１４５の突出部１４５ｔとを溶接する。これにより、溶接時に発生したスパッタが、挿入孔６２ｂを通過して捲回電極体４０の内部に進入するのを、鍔部１４５ｄによって抑制することができる。   In the second embodiment, as described later, in this state (in a state where the insertion hole 62b of the lid member 62 is closed by the flange portion 145d of the shaft core 145), the lid member 62 is opposite to the side where the flange portion 145d is located. The lid member 62 and the protruding portion 145t of the shaft core 145 are welded on the side (the tip end side in the axial direction). Thereby, the sputter | spatter which generate | occur | produced at the time of welding can suppress that it enters the inside of the winding electrode body 40 through the insertion hole 62b by the collar part 145d.

次に、実施例２にかかる電池１００の製造方法について、以下に説明する。
まず、実施例１と同様に、収容工程において、軸芯１４５の外周に捲回してなる捲回電極体４０を、軸芯１４５と共にケース本体６１の内部に収容する。次いで、被覆工程を行う（被覆部材６８を配置する）ことなく、ケース本体６１の軸線方向先端側の一部を、ケース本体６１の全周にわたって径方向内側（軸線ＡＸ２側）に変形させて、環状段部６１ｋを形成する。その後、開口部６１ｈの内側に、円環状のガスケット６９を配置する。 Next, a method for manufacturing the battery 100 according to Example 2 will be described below.
First, similarly to the first embodiment, in the housing process, the wound electrode body 40 wound around the outer periphery of the shaft core 145 is housed inside the case body 61 together with the shaft core 145. Next, without performing a covering step (disposing the covering member 68), a part of the case body 61 on the tip side in the axial direction is deformed radially inward (axis AX2 side) over the entire circumference of the case body 61, An annular step 61k is formed. Thereafter, an annular gasket 69 is disposed inside the opening 61h.

次いで、配置工程に進み、実施例１と同様に、蓋部材６２の挿入孔６２ｂに軸芯１４５の突出部１４５ｔを挿入させるようにして、蓋部材６２をケース本体６１の開口６１ｊの内側（詳細には、ガスケット６９の内側）に配置する。なお、蓋部材６２は、ガスケット６９の段差部６９ｂ上に載置されることで、ケース本体６１に対し位置決めされる。   Next, the process proceeds to an arrangement step, and in the same manner as in the first embodiment, the protrusion 145t of the shaft core 145 is inserted into the insertion hole 62b of the cover member 62 so that the cover member 62 is positioned inside the opening 61j of the case body 61 (details). Is disposed inside the gasket 69. The lid member 62 is positioned with respect to the case main body 61 by being placed on the stepped portion 69 b of the gasket 69.

ところで、本実施例２でも、蓋部材６２の挿入孔６２ｂを、実施例１と同様の長孔としている（図３参照）。これにより、捲回電極体４０と共にケース本体６１の内部に収容した軸芯１４５（その軸線ＡＸ３）が、ケース本体６１の軸線ＡＸ２に対し傾いていたり軸ズレしている場合（図１３及び図１４参照）でも、実施例１と同様に、軸芯１４５の突出部１４５ｔを蓋部材６２の挿入孔６２ｂに挿入することで、適切に、蓋部材６２をケース本体６１の開口６１ｊの内側（詳細には、ガスケット６９の内側）の所定位置（ガスケット６９の段差部６９ｂに接触する位置）に配置することができる。   By the way, also in the present Example 2, the insertion hole 62b of the cover member 62 is made into the long hole similar to Example 1 (refer FIG. 3). As a result, the shaft core 145 (its axis AX3) housed inside the case body 61 together with the wound electrode body 40 is inclined or misaligned with respect to the axis AX2 of the case body 61 (FIGS. 13 and 14). However, similarly to the first embodiment, by inserting the protruding portion 145t of the shaft core 145 into the insertion hole 62b of the lid member 62, the lid member 62 is appropriately placed inside the opening 61j of the case body 61 (in detail). Can be arranged at a predetermined position (inside the gasket 69) (a position where the gasket 69 contacts the stepped portion 69 b).

次に、溶接工程に進み、蓋部材６２の挿入孔６２ｂに挿入された軸芯１４５の突出部１４５ｔのうち、挿入孔６２ｂの短手方向（図１８及び図１９において左右方向）について蓋部材６２と近接または接触する部位を、蓋部材６２と溶接する。具体的には、図１８に示すように、蓋部材６２の外側（蓋部材６２について鍔部１４５ｄが位置する側とは反対側、図１８において蓋部材６２の上側）から、挿入孔６２ｂの短手方向（図１８及び図１９において左右方向）について軸芯１４５の突出部１４５ｔと蓋部材６２とが互いに近接または接触する位置（軸芯１４５の径方向に対向する２箇所）にレーザービームＬＢを照射して、蓋部材６２と軸芯１４５（突出部１４５ｔ）とをレーザー溶接する。このように、軸芯１４５の突出部１４５ｔと蓋部材６２（正極外部端子）とを溶接して、両者を電気的に接続することで、両者の間の電気抵抗を小さくすることができる。   Next, it progresses to a welding process and it is the cover member 62 about the transversal direction (left-right direction in FIG.18 and FIG.19) of the insertion hole 62b among the protrusion parts 145t of the axial center 145 inserted in the insertion hole 62b of the cover member 62. A portion that is close to or in contact with the lid member 62 is welded. Specifically, as shown in FIG. 18, from the outside of the lid member 62 (on the opposite side of the lid member 62 from the side where the flange portion 145d is located, the upper side of the lid member 62 in FIG. 18), the insertion hole 62b is short. In the hand direction (left and right direction in FIGS. 18 and 19), the laser beam LB is applied to a position where the protruding portion 145t of the shaft core 145 and the lid member 62 are close to or in contact with each other (two locations facing the radial direction of the shaft core 145). Irradiation is performed, and the lid member 62 and the shaft core 145 (projection 145t) are laser welded. Thus, the electrical resistance between both can be made small by welding the protrusion part 145t of the axial core 145, and the cover member 62 (positive electrode external terminal), and electrically connecting both.

ところで、上述のように軸芯１４５の突出部１４５ｔと蓋部材６２とを溶接したとき、スパッタが発生（飛散）することがある。このスパッタが、正極捲回部４４の間隙Ｓ１を通じて捲回電極体４０の内部に進入した場合には、スパッタによって捲回電極体４０の内部短絡（スパッタを通じた正極板と負極板との電気的接続など）が生じる虞があった。   By the way, when the protrusion 145t of the shaft core 145 and the lid member 62 are welded as described above, spatter may be generated (scattered). When this sputter enters the inside of the wound electrode body 40 through the gap S1 of the positive electrode winding portion 44, an internal short circuit of the wound electrode body 40 by sputtering (electrical connection between the positive electrode plate and the negative electrode plate through the spattering). Connection) may occur.

これに対し、本実施例２では、前述のように、軸芯として、突出部１４５ｔの径方向外側に突出した円環状の鍔部１４５ｄを有する軸芯１４５を用いている。そして、配置工程では、軸芯１４５の突出部１４５ｔのうち鍔部１４５ｄよりも軸線方向先端側（図１８において上側）の部位を蓋部材６２の挿入孔６２ｂに挿入して、蓋部材６２を、鍔部１４５ｄに対し軸線方向先端側（捲回電極体４０が位置する側とは反対側）に配置する（鍔部１４５ｄよりも軸線方向先端側に蓋部材６２を配置する）。これにより、蓋部材６２に対し捲回電極体４０側（軸線方向後端側、図１８において下側）の位置で、蓋部材６２の挿入孔６２ｂの一部または全部（本実施例２では全部）を、軸芯１４５の鍔部１４５ｄによって塞ぐことができる（図１９参照）。   In contrast, in the second embodiment, as described above, the shaft core 145 having the annular flange portion 145d protruding outward in the radial direction of the protruding portion 145t is used as the shaft core. Then, in the arranging step, a portion of the projecting portion 145t of the shaft core 145 that is closer to the distal end side in the axial direction than the flange portion 145d (upper side in FIG. 18) is inserted into the insertion hole 62b of the lid member 62, It arrange | positions in the axial direction front end side (opposite side where the winding electrode body 40 is located) with respect to the collar part 145d (The cover member 62 is arrange | positioned in the axial direction front end side rather than the collar part 145d). As a result, a part or all of the insertion hole 62b of the lid member 62 (all in the second embodiment) at the position on the wound electrode body 40 side (the axial rear end side, the lower side in FIG. 18) with respect to the lid member 62. ) Can be closed by the flange 145d of the shaft core 145 (see FIG. 19).

さらに、溶接工程では、上述のように、蓋部材６２について鍔部１４５ｄが位置する側とは反対側（軸線方向先端側、図１８において上側）で、蓋部材６２と軸芯１４５の突出部１４５ｔとを溶接する。詳細には、蓋部材６２について鍔部１４５ｄが位置する側とは反対側（図１８において蓋部材６２の上側）から、挿入孔６２ｂの短手方向（図１８及び図１９において左右方向）について突出部１４５ｔと蓋部材６２とが互いに近接または接触する位置（軸芯１４５の径方向に対向する２箇所）にレーザービームＬＢを照射して、蓋部材６２と突出部１４５ｔとをレーザー溶接する。   Further, in the welding process, as described above, the lid member 62 and the projecting portion 145t of the shaft core 145 on the side opposite to the side where the flange portion 145d is located (the tip in the axial direction, the upper side in FIG. 18). And weld. Specifically, the lid member 62 protrudes from the side opposite to the side where the flange portion 145d is located (the upper side of the lid member 62 in FIG. 18) in the short direction of the insertion hole 62b (the left-right direction in FIGS. 18 and 19). The laser beam LB is irradiated to the position where the portion 145t and the lid member 62 are close to or in contact with each other (two locations facing the radial direction of the shaft core 145), and the lid member 62 and the protruding portion 145t are laser welded.

このとき、上述のように、蓋部材６２に対し捲回電極体４０側（軸線方向後端側、図１８において下側）の位置で、蓋部材６２の挿入孔６２ｂの一部または全部（本実施例２では全部）を、軸芯１４５の鍔部１４５ｄによって塞いでいるので（図１９参照）、溶接時に発生したスパッタが、蓋部材６２の挿入孔６２ｂを通過して、捲回電極体４０の内部に進入するのを抑制することができる。これにより、スパッタによる捲回電極体４０の内部短絡を抑制することができる。   At this time, as described above, a part or all of the insertion hole 62b of the lid member 62 (the book) is located at the position on the wound electrode body 40 side (the rear end side in the axial direction, the lower side in FIG. 18) with respect to the lid member 62. Since all of the second embodiment is closed by the flange portion 145d of the shaft core 145 (see FIG. 19), the spatter generated during welding passes through the insertion hole 62b of the lid member 62 and passes through the wound electrode body 40. It can suppress entering the inside of the. Thereby, the internal short circuit of the wound electrode body 40 by sputtering can be suppressed.

次いで、ケース本体６１の開口６１ｊを構成する開口部６１ｈを加締めて、ガスケット６９と共に蓋部材６２を、ケース本体６１に固定する（図１６参照）。これにより、ケース本体６１と蓋部材６２との間をガスケット６９によって電気的に絶縁しつつ、ケース本体６１と蓋部材６２とが一体とされて、電池ケース６０が形成される。その後、軸芯１４５の先端側開口４５ｋを通じて、ケース本体６１の内部に電解液を注入する。その後、蓋部材６２の凹部６２ｃの表面に、安全弁６３を全周溶接する。これにより、蓋部材６２の挿入孔６２ｂ及び軸芯１４５の先端側開口４５ｋが閉塞され、密閉型の電池１００が完成する。   Next, the opening 61h constituting the opening 61j of the case body 61 is crimped, and the lid member 62 is fixed to the case body 61 together with the gasket 69 (see FIG. 16). Thus, the battery case 60 is formed by integrating the case body 61 and the lid member 62 while electrically insulating the case body 61 and the lid member 62 by the gasket 69. Thereafter, an electrolytic solution is injected into the case main body 61 through the opening 45k on the distal end side of the shaft core 145. Thereafter, the safety valve 63 is welded to the entire surface of the recess 62 c of the lid member 62. As a result, the insertion hole 62b of the lid member 62 and the distal end side opening 45k of the shaft core 145 are closed, and the sealed battery 100 is completed.

以上において、本発明を実施例１，２に即して説明したが、本発明は上記実施例に限定されるものではなく、その要旨を逸脱しない範囲で、適宜変更して適用できることはいうまでもない。   In the above, the present invention has been described with reference to the first and second embodiments. However, the present invention is not limited to the above-described embodiments, and it can be applied as appropriate without departing from the scope of the present invention. Nor.

例えば、実施例２の電池１００において、実施例１のように、捲回電極体４０のうち蓋部材６２側（図１６において上側）の端部（正極捲回部４４を含む軸線方向先端側端部４０ｂ）を覆う被覆部材を設けるようにしても良い。この場合、被覆部材は、例えば、径方向（図６において左右方向）に２分割できる形態とし、捲回電極体４０をケース本体６１内に収容する前に、軸芯１４５の鍔部１４５ｄよりも軸線方向後端側（図１６において鍔部１４５ｄよりも下側）の位置で、分割した被覆部材を、捲回電極体４０の径方向外側から、捲回電極体４０の軸線方向先端側端部４０ｂに被せるように配置すると良い。   For example, in the battery 100 according to the second embodiment, as in the first embodiment, the end (upper end in the axial direction including the positive winding portion 44) of the wound electrode body 40 on the lid member 62 side (the upper side in FIG. 16). A covering member covering the portion 40b) may be provided. In this case, for example, the covering member can be divided into two in the radial direction (left-right direction in FIG. 6), and before the wound electrode body 40 is accommodated in the case body 61, the covering member is more than the flange portion 145 d of the shaft core 145. At the position on the rear end side in the axial direction (below the flange portion 145d in FIG. 16), the divided covering member is connected to the distal end side in the axial direction of the wound electrode body 40 from the radially outer side of the wound electrode body 40. It may be arranged so as to cover 40b.

１，１００ 電池
１０ 正極板
２０ 負極板
３０ セパレータ
４０ 捲回電極体
４５，１４５ 軸芯
４５ｔ 突出部
６１ ケース本体
６２ 蓋部材
６２ｂ 挿入孔
６８ 被覆部材
１４５ｄ 鍔部 DESCRIPTION OF SYMBOLS 1,100 Battery 10 Positive electrode plate 20 Negative electrode plate 30 Separator 40 Winding electrode body 45,145 Shaft core 45t Protrusion part 61 Case main body 62 Lid member 62b Insertion hole 68 Cover member 145d Gutter part

Claims (6)

軸芯と、
正極板、負極板、及びセパレータを上記軸芯の外周に捲回してなる捲回電極体であって、上記正極板または上記負極板が上記軸芯と電気的に接続してなる捲回電極体と、
上記捲回電極体を収容する有底筒状のケース本体と、
上記ケース本体の開口を塞ぐ蓋部材であって、上記捲回電極体が捲回されてなる上記軸芯のうち上記捲回電極体から軸線方向先端側に突出する突出部が挿入される挿入孔を有する蓋部材と、を備える
電池の製造方法であって、
上記蓋部材の上記挿入孔は、
平面視細長形状をなし、
当該挿入孔に上記軸芯の上記突出部を挿入したときに、上記挿入孔内において、上記突出部と上記蓋部材とが、上記挿入孔の短手方向について近接または接触する寸法を有し、
上記軸芯の外周に捲回してなる上記捲回電極体を、上記軸芯と共に上記ケース本体の内部に収容する収容工程と、
上記軸芯の上記突出部を上記蓋部材の上記挿入孔に挿入して、上記蓋部材を上記ケース本体の上記開口の内側に配置する配置工程と、
上記挿入孔に挿入された上記軸芯の上記突出部のうち、上記挿入孔の短手方向について上記蓋部材と近接または接触する部位を、上記蓋部材と溶接する溶接工程と、を備える
電池の製造方法。 The shaft core,
A wound electrode body formed by winding a positive electrode plate, a negative electrode plate, and a separator around the outer periphery of the shaft core, wherein the positive electrode plate or the negative electrode plate is electrically connected to the shaft core. When,
A bottomed cylindrical case body that houses the wound electrode body;
A lid member that closes the opening of the case body, and is an insertion hole into which a protruding portion that protrudes from the wound electrode body toward the front end in the axial direction is inserted among the shaft core formed by winding the wound electrode body A battery manufacturing method comprising: a lid member having
The insertion hole of the lid member is
It has an elongated shape in plan view.
When the protruding portion of the shaft core is inserted into the insertion hole, the protruding portion and the lid member have a size in the proximity of or in contact with each other in the short direction of the insertion hole in the insertion hole,
An accommodating step of accommodating the wound electrode body wound around the outer periphery of the shaft core together with the shaft core in the case body;
An arrangement step of inserting the protruding portion of the shaft core into the insertion hole of the lid member and arranging the lid member inside the opening of the case body;
A welding step of welding a portion of the projecting portion of the shaft core inserted into the insertion hole, which is close to or in contact with the lid member in a short direction of the insertion hole, to the lid member. Production method. 請求項１に記載の電池の製造方法であって、
前記配置工程に先立って、電気絶縁性を有する被覆部材により、前記捲回電極体のうち前記軸線方向先端側の端部を覆う被覆工程を備える
電池の製造方法。 A battery manufacturing method according to claim 1, comprising:
Prior to the arranging step, a battery manufacturing method including a covering step of covering an end portion of the wound electrode body on the distal end side in the axial direction with a covering member having electrical insulation. 請求項１または請求項２に記載の電池の製造方法であって、
前記軸芯の前記突出部は、自身の径方向外側に突出した環状の鍔部を有し、
前記配置工程は、
上記軸芯の上記突出部のうち上記鍔部よりも軸線方向先端側の部位を前記蓋部材の前記挿入孔に挿入して、上記蓋部材を、上記鍔部に対し上記軸線方向先端側に配置し、
前記溶接工程は、
上記蓋部材について上記鍔部が位置する側とは反対側で、上記蓋部材と上記軸芯とを溶接する
電池の製造方法。 A method for producing a battery according to claim 1 or claim 2,
The protruding portion of the shaft core has an annular flange protruding outward in the radial direction of itself.
The arrangement step includes
A portion of the protruding portion of the shaft core that is closer to the distal end in the axial direction than the flange is inserted into the insertion hole of the lid member, and the lid member is disposed on the distal end in the axial direction with respect to the flange. And
The welding process includes
A method for manufacturing a battery, wherein the lid member and the shaft core are welded to the lid member on the side opposite to the side where the flange portion is located. 軸芯と、
正極板、負極板、及びセパレータを上記軸芯の外周に捲回してなる捲回電極体であって、上記正極板または上記負極板が上記軸芯と電気的に接続してなる捲回電極体と、
上記捲回電極体を収容する有底筒状のケース本体と、
上記ケース本体の開口を塞ぐ蓋部材であって、上記捲回電極体が捲回されてなる上記軸芯のうち上記捲回電極体から軸線方向先端側に突出する突出部が挿入された挿入孔を有する蓋部材と、を備える
電池であって、
上記蓋部材の上記挿入孔は、平面視細長形状をなし、
上記挿入孔に挿入された上記軸芯の上記突出部と上記蓋部材とは、上記挿入孔内において、上記挿入孔の短手方向について近接または接触し、
上記挿入孔に挿入された上記軸芯の上記突出部のうち、上記挿入孔の短手方向について上記蓋部材と近接または接触する部位が、上記蓋部材と溶接されてなる
電池。 The shaft core,
A wound electrode body formed by winding a positive electrode plate, a negative electrode plate, and a separator around the outer periphery of the shaft core, wherein the positive electrode plate or the negative electrode plate is electrically connected to the shaft core. When,
A bottomed cylindrical case body that houses the wound electrode body;
A lid member for closing the opening of the case body, wherein an insertion hole into which a projecting portion projecting from the wound electrode body toward the distal end in the axial direction is inserted among the shaft core formed by winding the wound electrode body A battery comprising a lid member having
The insertion hole of the lid member has an elongated shape in plan view,
The protruding portion of the shaft core inserted into the insertion hole and the lid member are close to or in contact with each other in the short direction of the insertion hole in the insertion hole,
A battery formed by welding a portion of the protruding portion of the shaft core inserted into the insertion hole that is close to or in contact with the lid member in a short direction of the insertion hole. 請求項４に記載の電池であって、
電気絶縁性を有する被覆部材であって、前記蓋部材と前記捲回電極体との間に位置し、上記捲回電極体のうち上記蓋部材側の端部を覆う被覆部材を備える
電池。 The battery according to claim 4,
A battery comprising a covering member having electrical insulation, the cover member being located between the lid member and the wound electrode body and covering an end portion of the wound electrode body on the lid member side. 請求項４または請求項５に記載の電池であって、
前記軸芯の前記突出部は、自身の径方向外側に突出した環状の鍔部を有し、
前記蓋部材は、上記軸芯の上記突出部のうち上記鍔部よりも軸線方向先端側の部位を前記挿入孔に挿入させた状態で、上記鍔部に対し上記軸線方向先端側に配置され、上記鍔部が位置する側とは反対側で上記軸芯と溶接されてなる
電池。 The battery according to claim 4 or 5, wherein
The protruding portion of the shaft core has an annular flange protruding outward in the radial direction of itself.
The lid member is disposed on the distal end side in the axial direction with respect to the flange portion in a state where the portion on the distal end side in the axial direction with respect to the flange portion among the protruding portions of the shaft core is inserted into the insertion hole, A battery that is welded to the shaft core on the side opposite to the side on which the collar is located.
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