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CN-121986413-A - Cylindrical battery

CN121986413ACN 121986413 ACN121986413 ACN 121986413ACN-121986413-A

Abstract

The battery (10) is provided with an electrode body in which a positive electrode and a negative electrode are wound with a separator interposed therebetween, a cylindrical outer can in which the electrode body is housed, a sealing body fastened to an opening of the outer can via a gasket, a plurality of electrode leads (20) joined to the positive electrode at intervals in the positive electrode longitudinal direction, and an upper collector plate (50) which is included in the sealing body and in which the tip end side of the positive electrode lead (20) is welded to the upper collector plate (50) by a plurality of spot-shaped welded portions (70) located at positions spaced apart in the circumferential direction. According to the battery (10), a plurality of electrode leads (20) are easily and reliably welded to an upper collector plate (50), and damage to the electrode leads (20) is less likely to occur.

Inventors

  • OKIMOTO RYOTA
  • HASEGAWA TAKASUMI
  • HIRAMATSU TOSHIYA

Assignees

  • 松下知识产权经营株式会社

Dates

Publication Date
20260505
Application Date
20240826
Priority Date
20230927

Claims (8)

  1. 1. A cylindrical battery is provided with: An electrode body obtained by winding the 1 st electrode and the 2 nd electrode with a separator interposed therebetween; a bottomed tubular outer can accommodating the electrode body; A sealing body fastened to an opening of the outer can via a gasket chisel; a plurality of electrode leads connected to the 1 st electrode at intervals in the 1 st electrode length direction, and And a current collecting plate which is included in the sealing body and to which the tip end side of the electrode lead is welded by a plurality of spot-shaped welding portions located at positions spaced apart in the circumferential direction.
  2. 2. A cylindrical battery is provided with: An electrode body obtained by winding the 1 st electrode and the 2 nd electrode with a separator interposed therebetween; a bottomed tubular outer can accommodating the electrode body; A sealing body fastened to an opening of the outer can via a gasket chisel; a plurality of electrode leads connected to the 1 st electrode at intervals in the 1 st electrode length direction, and A current collecting plate which is included in the sealing body and to which the tip end side of the electrode lead is welded by a welding portion extending in the circumferential direction, Both the inner edge and the outer edge of the welded portion in the radial direction have a wave shape in which the irregularities are alternately repeated when viewed from the axial plane.
  3. 3. The cylindrical battery according to claim 1 or 2, The tip end side of the electrode lead is welded only to the collector plate.
  4. 4. The cylindrical battery according to claim 1 or 2, The outer side in the radial direction of the collector plate is engaged with a terminal cover constituting an external terminal, An annular space which is opened only to the inside in the radial direction is provided between the current collecting plate and the terminal cover in the axial direction, Only the tip side of the electrode lead welded to the collector plate is disposed in the annular space.
  5. 5. The cylindrical battery according to claim 1, The distance between the welding portions adjacent to each other in the circumferential direction is 3mm or less.
  6. 6. The cylindrical battery according to claim 1 or 2, The width of the welded portion is 0.01mm or more and 3mm or less.
  7. 7. The cylindrical battery according to claim 1 or 2, The ratio of the thickness of the welded portion in the axial direction to the thickness of the collector plate in the axial direction in a cross section including the welded portion is 0.05 to 0.95.
  8. 8. The cylindrical battery according to claim 1 or 2, There are 4 groups of 2 electrode leads each having a lead overlapping portion overlapping each other in the axial direction, The groups of the electrode leads of the 4 groups are located at positions spaced apart in the circumferential direction, The 2 lead overlapping portions overlapping in the axial direction are welded, and the 2 lead overlapping portions and the collector plate after welding are also welded.

Description

Cylindrical battery Technical Field The present disclosure relates to cylindrical batteries. Background Conventionally, there is a cylindrical battery described in patent document 1 as a cylindrical battery. The cylindrical battery includes an electrode body, a cylindrical outer can having a bottom for accommodating the electrode body, a sealing member for sealing an opening of the outer can, and a gasket sandwiched between the outer can and the sealing member. The electrode body has a structure in which a positive electrode and a negative electrode are wound with a separator interposed therebetween. The positive electrode and the sealing body are electrically connected via a positive electrode lead, and the negative electrode and the bottom of the outer can are electrically connected via a negative electrode lead. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 09-274923 Disclosure of Invention Fig. 9 is an axial sectional view of the cylindrical battery of the reference example. The cylindrical battery 210 of the reference example is not known, and cannot be the conventional art of the cylindrical battery of the present disclosure, but cannot be a technology for negating patentability of the cylindrical battery of the present disclosure. As shown in fig. 9, the cylindrical battery 210 of the reference example has a plurality of positive electrode leads 20 joined to the positive electrode of the electrode body 14 at intervals in the positive electrode longitudinal direction. The distal end portion of each positive electrode lead 20 is bent so as to extend along the upper side of the upper collector plate 50 having an annular shape when viewed in plan, and is sandwiched between the upper collector plate 50 and the annular metal ring 290. The upper collector plate 50, the positive electrode lead 20, and the metal ring 290 are welded to each other by continuously scanning laser light circularly from the upper side in the circumferential direction while the distal end portion of each positive electrode lead 20 is sandwiched between the upper collector plate 50 and the annular metal ring 290, and irradiating the metal ring 290 with the laser light. The positive electrode is electrically connected to the terminal cover 27 joined to the upper collector plate 50. In the cylindrical battery 210 of the reference example, since the plurality of positive electrode leads 20 joined to the positive electrode with an interval in the positive electrode longitudinal direction are each electrically connected to the terminal cover 27, the current collecting path is shortened and the resistance is reduced. However, the inventors found that, when laser welding is performed in which laser light is continuously scanned in a circular shape from the upper side in the circumferential direction, the positive electrode lead 20 may be damaged. Accordingly, an object of the present disclosure is to provide a cylindrical battery in which a plurality of electrode leads are easily and reliably welded to a current collecting plate, and damage to the electrode leads is less likely to occur. In order to solve the above problems, a cylindrical battery according to the present disclosure includes an electrode body in which a 1 st electrode and a 2 nd electrode are wound with a separator interposed therebetween, a bottomed tubular outer can accommodating the electrode body, a sealing body fastened to an opening of the outer can via a gasket chisel, a plurality of electrode leads joined to the 1 st electrode at intervals in a 1 st electrode longitudinal direction, and a collector plate which is included in the sealing body and has tip sides of the electrode leads welded to the collector plate by a plurality of spot-shaped welding portions located at positions spaced apart in a circumferential direction. The cylindrical battery according to another aspect of the present disclosure includes an electrode body obtained by winding a1 st electrode and a2 nd electrode with a separator interposed therebetween, a bottomed tubular outer can accommodating the electrode body, a sealing body fastened to an opening of the outer can via a gasket, a plurality of electrode leads joined to the 1 st electrode at intervals in a1 st electrode longitudinal direction, and a current collecting plate which is included in the sealing body and has a corrugated shape in which both an inner edge and an outer edge in a radial direction of the welded portion alternately repeat as viewed from an axial plane, the current collecting plate being welded to the current collecting plate at a tip end side of the electrode leads by a welded portion extending in a circumferential direction. According to the cylindrical battery of the present disclosure, a plurality of electrode leads are easily and reliably welded to the current collecting plate, and damage to the electrode leads is less likely to occur. Drawings Fig. 1 is an axial cross-sectional