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JP-7854994-B2 - sealed battery

JP7854994B2JP 7854994 B2JP7854994 B2JP 7854994B2JP-7854994-B2

Inventors

  • 沖本 良太
  • 奥谷 仰
  • 原口 心
  • 長谷川 高澄
  • 鶴留 直之

Assignees

  • パナソニックエナジー株式会社

Dates

Publication Date
20260507
Application Date
20220617
Priority Date
20210625

Claims (5)

  1. Electrode body and An outer container for housing the electrode body, A sealing body that closes the opening of the outer can, Equipped with, The sealing body includes a cap and a current collector plate positioned on the electrode body side of the cap and welded to the cap. The current collector plate has a protrusion that extends toward the cap at the welded portion with the cap, The cap is a sealed battery having a recess into which the protrusion of the current collector plate fits .
  2. A sealed battery according to claim 1 , wherein a gap is formed between the convex portion and the concave portion, at least around the welded portion, in the thickness direction of the sealing body.
  3. A space wider than the gap is formed between the portion of the current collector plate located inside the protrusion and the cap. The sealed battery according to claim 2 , wherein the gap is in communication with the space.
  4. The sealed battery according to any one of claims 1 to 3 , wherein the protrusion of the current collector plate is formed in an annular shape.
  5. The electrode body comprises electrode leads that connect the electrodes and the current collector plate, The sealed battery according to any one of claims 1 to 3 , wherein a plurality of electrode leads are provided at predetermined intervals along the longitudinal direction of the electrode.

Description

This disclosure relates to sealed batteries, and more particularly to cylindrical sealed batteries. Sealed batteries, such as cylindrical batteries, are used not only for mobile devices but also, in recent years, for automotive applications, and there is a demand for even higher output. A sealed battery generally comprises an electrode body, a bottomed cylindrical outer casing that houses the electrode body, and a sealing body that closes the opening of the outer casing. The sealing body includes a cap and a current collector plate to which electrode leads extending from the electrode body are connected, and the cap and current collector plate are welded together. In sealed batteries, preventing electrolyte leakage and improving the internal airtightness of the battery is a crucial challenge. For example, Patent Document 1 discloses a sealed battery in which the outer surface of the outer periphery of the cap is formed to create an anchoring effect on the gasket, thereby improving leak resistance and airtightness. Patent Document 2 also discloses a sealed battery in which the gasket is brought into contact with the inner wall of the outer casing inside the grooved portion of the outer casing, thereby reducing the rise of electrolyte along the inner wall of the outer casing and improving airtightness. Japanese Patent Publication No. 2001-291498Japanese Patent Publication No. 2003-045476 This is a cross-sectional view of a sealed battery, which is an example of an embodiment.This is a front view of the electrode with the electrode leads connected.This is an enlarged view of section A in Figure 1.This is a plan view of the first insulating plate, showing the first insulating plate placed on the electrode body.This is a plan view of the second insulating plate, showing the second insulating plate placed on the electrode body.This figure shows an enlarged view of a portion of the cross-section of a sealing body, which is another example of the embodiment, and shows the state before welding the cap and the current collector plate.This figure shows an enlarged view of a portion of the cross-section of a sealing body, which is another example of the embodiment, showing the cap and current collector plate welded together. Hereinafter, an example of an embodiment of the sealed battery according to this disclosure will be described in detail with reference to the drawings. Note that configurations obtained by selectively combining the multiple embodiments and modifications described below are included in this disclosure. The configuration of the sealed battery according to this disclosure is suitable for a cylindrical battery equipped with a bottomed cylindrical outer casing. However, the outer casing constituting the sealed battery is not limited to a cylindrical outer casing, and may be, for example, a rectangular outer casing (rectangular battery). Furthermore, the electrode body is not limited to a wound electrode body, and may be a laminated electrode body in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked with separators in between. Figure 1 is a cross-sectional view of a cylindrical battery 1, which is an example of an embodiment. As shown in Figure 1, the cylindrical battery 1 comprises an electrode body 10, a bottomed cylindrical outer casing 20 that houses the electrode body 10, and a sealing body 30 that closes the opening of the outer casing 20. The outer casing 20 contains an electrolyte together with the electrode body 10. The electrolyte may be an aqueous electrolyte, but in this embodiment, a non-aqueous electrolyte is used. The outer casing 20 has grooves 23 formed in its side wall 21, and the sealing body 30 is supported by the grooves 23 and closes the opening of the outer casing 20. In the following description, for convenience, the sealing body 30 side of the cylindrical battery 1 is considered the top, and the bottom 22 side of the outer casing 20 is considered the bottom. In this specification, the vertical direction of the cylindrical battery 1 and the thickness direction of the sealing body 30 are the same. The cylindrical battery 1 further includes an electrode lead extending from a position opposite the grooved portion 23 on the outer circumference of the electrode body 10, directly connecting the first electrode constituting the electrode body 10 to the current collector plate 32 of the sealing body 30, and an upper insulating plate 40 disposed between the electrode body 10 and the sealing body 30. The electrode body 10 is a wound-type electrode body in which the first electrode and the second electrode are wound around a separator. In this embodiment, the first electrode is the positive electrode 11 (see Figure 2 below), the second electrode is the negative electrode, and the electrode lead is the positive electrode lead 12. The cylindrical battery 1 may also have a lower insulating plate disposed between the electrode body 10 and the