Lithium Secondary Battery Into Which Electrolytic Solution Can Be Additionally Injected

Patent metadata

Field	Value
Publication number	US-2024079752-A1
Application number	US-202218272708-A
Country	US
Kind code	A1
Filing date	Nov 23, 2022
Priority date	Nov 24, 2021
Publication date	Mar 7, 2024
Grant date	—

Abstract

A lithium secondary battery includes: an electrolyte replenishing unit filled with a preliminary electrolyte inside a packaging member; and a rupture member disposed adjacent to the electrolyte replenishing unit. The rupture member is deformed by a temperature change to form a hole in the packaging member so that the preliminary electrolyte inside the electrolyte replenishing unit can be injected.

First claim

1 . A lithium secondary battery, accommodating an electrode assembly and a main electrolyte disposed inside a battery case, comprising:
an electrolyte replenishing unit filled with a preliminary electrolyte disposed inside a packaging member; and a rupture member disposed adjacent to the electrolyte replenishing unit and configured to be deformed by a temperature change to form a hole in the packaging member, so that the preliminary electrolyte disposed inside the electrolyte replenishing unit can be injected.

2 . The lithium secondary battery of claim 1 , wherein
the packaging member is a pouch-type form including a thermoplastic synthetic resin film.

3 . The lithium secondary battery of claim 2 , wherein
the packaging member includes a polyethylene resin film.

4 . The lithium secondary battery of claim 1 , wherein
the electrolyte replenishing unit and the rupture member are disposed in a separation space between the electrode assembly and the battery case.

5 . The lithium secondary battery of claim 1 , wherein
the electrolyte replenishing unit and the rupture member are disposed adjacent to an upper surface of the battery case, wherein the electrolyte replenishing unit and the rupture member are stacked on the electrode assembly.

6 . The lithium secondary battery of claim 1 , wherein
the electrolyte replenishing unit and the rupture member are disposed in a dead space of a battery case sidewall near an end of the electrode assembly.

7 . The lithium secondary battery of claim 4 , wherein the rupture member is disposed between the electrolyte replenishing unit and the battery case.

8 . The lithium secondary battery of claim 1 , wherein
the rupture member is configured to be thermally deformed at a temperature in a range of 80° C. to 120° C.

9 . The lithium secondary battery of claim 1 , wherein
the rupture member is a shape-memory alloy.

10 . The lithium secondary battery of claim 1 , wherein
the rupture member is a bimetal.

11 . The lithium secondary battery of claim 1 , wherein
the rupture member is joined to the electrolyte replenishing unit, and a weak part is disposed in the packaging member along an edge direction of the rupture member.

12 . The lithium secondary battery of claim 1 , wherein
the preliminary electrolyte does not comprise an additive for a SEI film formation.

13 . The lithium secondary battery of claim 1 , wherein
the battery case is a cylindrical metal can.

14 . A lithium secondary battery electrolyte replenishment method comprises:
applying heat to the lithium secondary battery of claim 1 to cause thermal deformation in the rupture member.

15 . The method of claim 14 , wherein
a temperature at which heat is applied to the rupture member is 80° C. to 120° C.

16 . The lithium secondary battery of claim 1 , wherein
the battery case is a prismatic metal can.

17 . The lithium secondary battery of claim 1 , wherein
the electrolyte replenishing unit and the rupture member are disposed adjacent to a lower surface of the battery case, wherein the electrolyte replenishing unit and the rupture member are stacked on the electrode assembly.

Assignees

• Lg Energy Solution Ltd

Inventors

• Lee Han Young

Classifications

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M50/682 Primary

  accommodated in battery or cell casings · CPC title

• H01M10/052 Primary

  Li-accumulators · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M50/609

  Arrangements or processes for filling with liquid, e.g. electrolytes · CPC title