WO2023176853A1 - 電池 - Google Patents
電池 Download PDFInfo
- Publication number
- WO2023176853A1 WO2023176853A1 PCT/JP2023/009948 JP2023009948W WO2023176853A1 WO 2023176853 A1 WO2023176853 A1 WO 2023176853A1 JP 2023009948 W JP2023009948 W JP 2023009948W WO 2023176853 A1 WO2023176853 A1 WO 2023176853A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- current collector
- cap
- collector plate
- gasket
- battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/184—Sealing members characterised by their shape or structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/167—Lids or covers characterised by the methods of assembling casings with lids by crimping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
-
- 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
Definitions
- the present disclosure relates to a battery in which an opening of an outer can is closed with a sealant via a gasket.
- Lithium ion secondary batteries are widely used in applications such as driving power sources for mobile devices and electric vehicles, and large power storage devices.
- a lithium ion secondary battery is a sealed type that has an electrode body consisting of a wound body in which a positive electrode and a negative electrode are wound with a separator in between, and an electrolyte housed in an outer can, with the opening of the outer can closed with a sealant. It has been known.
- the sealing body includes a current collector plate connected to the electrode body by wiring and a cap welded to the current collector plate, and the cap functions as an electrode terminal. Then, the peripheral edge of the stack of the current collector plate and the cap is wrapped in a gasket, and this gasket is fixed by caulking from the outside at the end of the outer can (see Patent Document 1).
- the cap and the current collector plate are welded at the radially intermediate portion, and the two may be positioned with a slight gap at their outer ends.
- the center side of the cap may be lifted up and deformed (curved upward), making it impossible to maintain flatness and causing insufficient welding to the current collector plate. there were.
- the battery according to the present disclosure includes: an outer can having an opening at one end; an electrode body housed in the outer can and formed by winding a positive electrode, a negative electrode, and a separator; and a sealing body that closes the opening.
- the sealing body includes a ring-shaped current collector plate connected to the electrode body by a lead, and is laminated on the current collector plate, and the sealing body is stacked on the current collector plate at a radially intermediate portion.
- the outer can includes a joined disk-shaped cap and a gasket that wraps around the peripheral edge of the stack of the current collector plate and the cap from above and below and from the sides, and the outer can includes a peripheral edge of the gasket at an upper end portion thereof.
- the gasket has an inward protrusion that is inserted from the outside between the current collector plate and the cap, and the protrusion allows the current collector plate to connect with the cap. Fill the gap with the cap.
- the center side of the cap can be prevented from being deformed so as to be lifted.
- FIG. 2 is a cross-sectional view showing the overall configuration of a battery.
- FIG. 3 is a cross-sectional view of the sealing part showing the welding location of the cap/current collector plate.
- FIG. 7 is a cross-sectional view of the sealing portion showing the cap bent upward by caulking.
- FIG. 3 is a cross-sectional view of a sealing portion having a gasket provided with a protrusion.
- FIG. 3 is a cross-sectional view of the gasket.
- FIG. 1 is a sectional view showing the overall configuration of a lithium ion secondary battery according to an embodiment of the present disclosure. Note that although a cylindrical battery is shown in this embodiment, other shapes may be used, such as a square shape.
- the battery 1 includes a cylindrical electrode body 10, a cylindrical outer can 20 with an open upper end that houses the electrode body, and a circular sealing body 30 that closes the opening of the outer can 20.
- the outer can 20 contains an electrolytic solution together with the electrode body 10 .
- the electrolytic solution may be an aqueous electrolytic solution, in this embodiment, a non-aqueous electrolytic solution is used.
- the outer can 20 has an annular groove 22 in the upper peripheral wall, and the sealing body 30 is supported by the groove 22 and closes the opening of the outer can 20.
- the sealing body 30 side of the battery 1 is placed at the top, and the bottom side of the outer can 20 is placed at the bottom.
- the electrode body 10 is a wound body in which a positive electrode and a negative electrode are wound with a separator in between.
- the positive electrode lead 12 connected to the positive electrode extends upward from the outer circumferential side of the electrode body 10.
- a disc-shaped upper insulating plate 24 is arranged above the electrode body 10. The upper insulating plate 24 has an opening in the center, and the positive electrode lead 12 extends upward through the opening in the upper insulating plate 24.
- the sealing body 30 has a cap 32, a current collector plate 34, and a gasket 36, and is formed into a disk shape as a whole.
- the outer peripheral end of the sealing body 30 is placed on the groove 22 of the outer can 20, and the upper end of the outer can 20 is bent inward, so that the sealing body 30 is caulked and fixed to the upper end of the outer can 20.
- the opening of the outer can 20 is closed.
- the cap 32 is a metal member that is circular as a whole and has a central portion that bulges upward.
- a wiring material is connected to the cap 32 when the battery 1 is modularized to form a battery pack, and in this embodiment functions as a positive external terminal.
- the metal outer can 20 is connected to the negative electrode of the electrode body 10, so the outer can 20 functions as the negative external terminal of the battery 1.
- the current collector plate 34 is a ring-shaped metal member having a diameter comparable to that of the cap 32, and is arranged closer to the electrode body 10 than the cap 32 is.
- the current collector plate 34 has an opening at the center in the radial direction.
- the cap 32 and the current collector plate 34 are welded, and the current collector plate 34 is welded at a position closer to the outer peripheral edge of the cap 32 than to the center in the radial direction.
- An annular convex portion 34 a is formed on the current collector plate 34 , and this convex portion 34 a becomes a welded portion with the cap 32 .
- a concave portion corresponding to the convex portion 34a of the current collector plate 34 is formed on the lower side of the cap 32, and the two are welded in a fitted state.
- a positive electrode ring 35 is arranged above the current collector plate 34 and inside the convex portion 34a so as to overlap the current collector plate 34. Then, the positive electrode lead 12 that has passed through the inside of the upper insulating plate 24 is inserted between the positive electrode ring 35 and the current collector plate 34 and fixed.
- the gasket 36 covers the outer periphery of the laminate of the cap 32 and the current collector plate 34 from above the periphery of the cap 32, and then extends inward along the lower surface of the current collector plate 34 to connect the current collector plate 34 and the upper insulator. It is interposed between the plates 24.
- the gasket 36 is an annular resin member or rubber member for preventing contact between the cap 32 and the current collector plate 34 and the outer can 20 and ensuring insulation between the outer can 20 and the sealing body 30. Further, the gasket 36 closes the gap between the outer can 20 and the sealing body 30 at the outer peripheral portion of the laminate, thereby sealing the inside of the battery 1.
- An opening that vertically overlaps the opening of the current collector plate 34 and the opening of the upper insulating plate 24 is formed in the radial center of the gasket 36, through which the positive electrode lead 12 passes. Further, in this example, it is preferable to form a through hole through which the electrolytic solution passes in a portion of the gasket 36 located below the current collector plate 34 .
- the upper end of the gasket 36 is bent inward together with the upper end of the outer can 20 located outside and fixed by caulking, thereby sandwiching the current collector plate 34 and the cap 32 on the inside. At this time, the gasket 36 is elastically deformed and seals the contact portion.
- the negative electrode of the electrode body 10 is connected to a negative electrode current collector plate 25 below it, and the negative electrode current collector plate 25 is connected to the outer can 20 at its central portion.
- a part of the negative electrode of the electrode body 10 may extend downward and be connected to the negative electrode current collector plate 25, it is also possible to provide a negative electrode lead and connect the negative electrode of the electrode body 10 and the negative electrode current collector plate 25 by the negative electrode lead. good.
- a circular recess 23 is provided at the bottom of the outer can 20 and functions as a safety valve that operates when an abnormality occurs in the battery 1.
- FIG. 2 is a diagram showing welded portions with circles. In this way, the top surface of the convex portion 34a matches the bottom surface of the concave portion of the cap 32 and is welded thereto.
- the sealing body 30 is composed of four parts: a cap 32, a current collector plate 34, a positive electrode ring 35, and a gasket 36.
- the gasket 36 and the current collector plate 34 are welded, and the electrolytic solution is poured. implement.
- the cap 32 is inserted, and the sealing body 30 is fixed to the outer periphery of the outer can 20 by caulking. After this caulking, the cap 32 and the current collector plate 34 are welded to ensure electrical continuity.
- FIG. 3 is a diagram showing a state where the cap 32 is warped upward. If upward warpage occurs in this way, a gap will be created in the welded portion with the current collector plate 34, and there is a possibility that the contact between the two will not be sufficient, and a sufficient joint will not be obtained during welding.
- FIG. 4 is a cross-sectional view showing the welded portion and its surroundings of the battery 1 according to the present embodiment
- FIG. 5 is a cross-sectional view of the gasket according to the present embodiment.
- the gasket 36 has a cylindrical side wall 362 whose outer circumferential side extends in the vertical direction, and a ring-shaped bottom wall 364 extends inward from the lower end of the side wall 362, with an opening at the center of the bottom wall 364. It has become.
- annular protrusion 366 that is formed by an undercut and protrudes inward is provided in the middle portion of the side wall 362.
- the protrusion 366 of the gasket 36 fits between the cap 32 and the peripheral edge of the current collector plate 34. Therefore, when the upper end portion of the outer can 20 is bent inward together with the upper end portion of the gasket 36 and caulked, it is possible to prevent the outer circumferential end of the cap 32 from moving downward and causing the central portion to warp upward. can. As a result, the flatness of the top surface of the convex portion 34a of the current collector plate 34 and the bottom surface of the concave portion of the cap 32 is maintained, and welding of these portions can be reliably performed.
- the protruding portion 366 seals the outer peripheral ends of the cap 32 and the current collector plate 34, airtightness between the cap 32 and the current collector plate 34 can be ensured.
- the gasket 36 has the protrusion 366, the outer peripheral end of the current collector plate 34 can be supported by the protrusion 366. That is, when the gasket 36 and current collector plate 34 are inserted into the outer can 20, the gasket 36 is elastically deformed and fixed to the inner surface of the outer can 20, and the gasket 36 holds the current collector plate 34, so that the outer case Even if the opening of the can 20 is directed downward, the current collecting plate 34 does not fall off, and the current collecting plate 34 and the positive electrode lead 12 can be welded in this state.
- 1 battery 10 electrode body, 12 positive electrode lead, 20 outer can, 22 groove, 23 recess, 24 upper insulating plate, 25 negative electrode current collector plate, 30 sealing body, 32 cap, 34 current collector plate, 34a convex part, 35 positive electrode ring, 36 gasket, 362 side wall, 364 bottom wall, 366 protrusion.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
図1は、本開示の一実施形態に係るリチウムイオン二次電池の全体構成を示す断面図である。なお、本実施形態では円筒型の電池を示すが、他の形状、例えば角型でもよい。
図2は、溶接部を丸印で示した図である。このように、凸部34aの頂面がキャップ32の凹部の下面に合致してここが溶接される。
Claims (2)
- 一端に開口部を有する外装缶と、
前記外装缶に収容され、正極と負極とセパレータとを巻回して形成された電極体と、
前記開口部を塞ぐ封口体と、
を含む電池であって、
前記封口体は、
前記電極体にリードにより接続されたリング状の集電板と、
前記集電板に積層されるとともに、径方向の中間部分で前記集電板に接合された円板状のキャップと、
前記集電板と前記キャップの積層体の周縁部を上下および側面から包み込むガスケットと、
を含み、
前記外装缶は、その上端部分において、前記ガスケットの周縁部を上下および側面を覆う状態で挟み込み固定し、
前記ガスケットは、前記集電板と前記キャップとの間に外側から挿入される内側への突出部を有し、前記突出部により前記集電板と前記キャップとの隙間を埋める、
電池。 - 前記ガスケットの突出部は円環状であって、前記集電板と前記キャップと間に位置することで、前記集電板と前記キャップと間の気密性を確保する、
請求項1に記載の電池。
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202380027053.XA CN118805289A (zh) | 2022-03-18 | 2023-03-14 | 电池 |
| EP23770806.0A EP4496087A4 (en) | 2022-03-18 | 2023-03-14 | BATTERY |
| JP2024508198A JPWO2023176853A1 (ja) | 2022-03-18 | 2023-03-14 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022-044518 | 2022-03-18 | ||
| JP2022044518 | 2022-03-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2023176853A1 true WO2023176853A1 (ja) | 2023-09-21 |
Family
ID=88023848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2023/009948 Ceased WO2023176853A1 (ja) | 2022-03-18 | 2023-03-14 | 電池 |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4496087A4 (ja) |
| JP (1) | JPWO2023176853A1 (ja) |
| CN (1) | CN118805289A (ja) |
| WO (1) | WO2023176853A1 (ja) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025115643A1 (ja) * | 2023-11-30 | 2025-06-05 | パナソニックIpマネジメント株式会社 | 円筒形電池 |
| WO2025142268A1 (ja) * | 2023-12-27 | 2025-07-03 | パナソニックIpマネジメント株式会社 | 円筒形電池 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005100927A (ja) * | 2003-08-28 | 2005-04-14 | Matsushita Electric Ind Co Ltd | 電池およびその製造方法 |
| JP2012518889A (ja) * | 2009-02-24 | 2012-08-16 | エバレデイ バツテリ カンパニー インコーポレーテツド | 電気化学電池のための閉鎖組立体 |
| JP2012252922A (ja) * | 2011-06-03 | 2012-12-20 | Fdk Energy Co Ltd | 円筒型電池 |
| JP2013120644A (ja) | 2011-12-06 | 2013-06-17 | Sanyo Electric Co Ltd | 密閉型電池 |
| WO2018225394A1 (ja) * | 2017-06-07 | 2018-12-13 | 株式会社村田製作所 | 二次電池、電池パック、電動車両、電力貯蔵システム、電動工具および電子機器 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2022045229A1 (ja) * | 2020-08-31 | 2022-03-03 |
-
2023
- 2023-03-14 JP JP2024508198A patent/JPWO2023176853A1/ja active Pending
- 2023-03-14 EP EP23770806.0A patent/EP4496087A4/en active Pending
- 2023-03-14 CN CN202380027053.XA patent/CN118805289A/zh active Pending
- 2023-03-14 WO PCT/JP2023/009948 patent/WO2023176853A1/ja not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005100927A (ja) * | 2003-08-28 | 2005-04-14 | Matsushita Electric Ind Co Ltd | 電池およびその製造方法 |
| JP2012518889A (ja) * | 2009-02-24 | 2012-08-16 | エバレデイ バツテリ カンパニー インコーポレーテツド | 電気化学電池のための閉鎖組立体 |
| JP2012252922A (ja) * | 2011-06-03 | 2012-12-20 | Fdk Energy Co Ltd | 円筒型電池 |
| JP2013120644A (ja) | 2011-12-06 | 2013-06-17 | Sanyo Electric Co Ltd | 密閉型電池 |
| WO2018225394A1 (ja) * | 2017-06-07 | 2018-12-13 | 株式会社村田製作所 | 二次電池、電池パック、電動車両、電力貯蔵システム、電動工具および電子機器 |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP4496087A4 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025115643A1 (ja) * | 2023-11-30 | 2025-06-05 | パナソニックIpマネジメント株式会社 | 円筒形電池 |
| WO2025142268A1 (ja) * | 2023-12-27 | 2025-07-03 | パナソニックIpマネジメント株式会社 | 円筒形電池 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP4496087A4 (en) | 2025-09-03 |
| CN118805289A (zh) | 2024-10-18 |
| EP4496087A1 (en) | 2025-01-22 |
| JPWO2023176853A1 (ja) | 2023-09-21 |
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