Button cell

Patent metadata

Field	Value
Publication number	US-2023238617-A1
Application number	US-202318128371-A
Country	US
Kind code	A1
Filing date	Mar 30, 2023
Priority date	Dec 25, 2020
Publication date	Jul 27, 2023
Grant date	—

Abstract

A button cell includes a packaging member and an electrode assembly. The packaging member includes an insulating wall, a first end cover, and a second end cover. The insulating wall is provided with a through accommodating cavity, and the first end cover and the second end cover are arranged at two ends of the accommodating cavity, respectively. The insulating wall is further provided with a first communication hole for communication between the accommodating cavity and an external environment of the packaging member. The electrode assembly is accommodated in the accommodating cavity and includes a first electrode plate and a second electrode. The packaging member further includes a first conductive terminal arranged at the first communication hole, which is electrically connected to the first electrode plate forming an outer tab of the button cell, and is arranged on a wall instead of an end cover.

First claim

1 . A button cell, comprising:
a packaging member comprising a first end cover, a second end cover and an insulating wall, wherein the insulating wall encloses an accommodating cavity, the first end cover covers a first end of the accommodating cavity, the second end cover covers a second end of the accommodating cavity, and the insulating wall is provided with a first communication hole for communication between the accommodating cavity and an external environment of the packaging member; and
an electrode assembly accommodated in the accommodating cavity and comprising a first electrode plate and a second electrode plate having opposite polarities; wherein the packaging member further comprises a first conductive terminal arranged at the first communication hole, and the first conductive terminal is electrically connected to the first electrode plate.

2 . The button cell according to claim 1 , wherein the insulating wall is further provided with a second communication hole for communication between the accommodating cavity and the external environment of the packaging member; and
the packaging member further comprises a second conductive terminal arranged at the second communication hole, and the second conductive terminal is electrically connected to the second electrode plate.

3 . The button cell according to claim 2 , wherein the insulating wall comprises at least two packaging units, and the at least two packaging units are spliced and fixed sequentially along a circumferential direction of the first end cover so that the insulating wall forms a closed ring shape along the circumferential direction.

4 . The button cell according to claim 3 , wherein at a joint of two adjacent packaging units, an end of one of the packaging units is recessed towards a side facing the accommodating cavity to form a first connection portion, the other one of the packaging units is recessed towards a side facing away from the accommodating cavity to form a second connection portion, and the first connection portion is fixed to a side of the second connection portion facing away from the accommodating cavity.

5 . The button cell according to claim 4 , wherein the interconnected first connection portion and second connection portion are fixed in at least one of the following ways:
ultrasonic welding, laser welding, bonding, or hot-pressing laminating.

6 . The button cell according to claim 4 , wherein at least one of the at least two packaging units comprises two first connection portions, and at least one of the at least two packaging units comprises two second connection portions; and/or
at least one of the at least two packaging units comprises both a first connection portion and a second connection portion.

7 . The button cell according to claim 4 , wherein a total thickness of the interconnected first connection portion and the second connection portion is equal to a thickness of the wall in portions other than the first connection portion and the second connection portion.

8 . The button cell according to claim 3 , wherein, the at least two packaging units comprise a first packaging unit and a second packaging unit; and
the first packaging unit is provided with the first communication hole, and the second packaging unit is provided with the second communication hole.

9 . The button cell according to claim 8 , wherein the first packaging unit comprises a first packaging layer and a second packaging layer that are stacked and fixed along a radial direction of the accommodating cavity;
a face of the first packaging layer facing the second packaging layer is provided with a first groove, and a bottom wall of the first groove is provided with a first through groove running through the first packaging layer; a face of the second packaging layer facing the first packaging layer is provided with a second groove, the second groove opposites to the first groove and has a same cross-section contour as the first groove, and a bottom wall of the second groove is provided with a second through groove running through the second packaging layer; and the first communication hole comprises the first groove, the first through groove, the second through groove, and the second through groove, and the first conductive terminal matches the first communication hole in shape.

10 . The button cell according to claim 8 , wherein the first conductive terminal and the first packaging unit are integrally formed through injection molding; and/or
the second conductive terminal and the second packaging unit are integrally formed through injection molding.

11 . The button cell according to claim 1 , further comprising a sealing plug, wherein the first end cover is provided with a through hole communicating with the accommodating cavity, and the sealing plug is fixed to the through hole and seals the through hole.

12 . The button cell according to claim 1 , wherein an outer surface of the wall is provided with protrusions or grooves or anti-skidding lines.

Assignees

• Ningde Amperex Technology Ltd

Inventors

• He Bangbang

Classifications

• H01M50/109 Primary

  of button or coin shape · CPC title

• H01M50/181

  for button or coin cells · CPC title

• H01M50/153

  for button or coin cells · CPC title

• H01M50/184

  characterised by their shape or structure · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title