IP Library › Granted Patent US 12665226
Granted Patent B2
US 12665226 · App. 17/779,437 · Granted Jun 23, 2026

Secondary battery and manufacturing method of the same

Inventors: Jongpil Jegal (Daejeon, KR); Hyo Seok Kang (Daejeon, KR)
Assignee: LG ENERGY SOLUTION, LTD.
H01M10/0587H01M10/0431H01M50/171H01M50/188
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Quick Facts
Patent No.
US 12665226
App. No.
17/779,437
Granted
Jun 23, 2026
Kind
B2
Abstract

A secondary battery includes a jelly roll-type electrode assembly impregnated with an electrolyte solution; a battery case for housing the electrode assembly and the electrolyte solution; a cap assembly coupled with an upper portion of the battery case; and a reference electrode in which one end is immersed with the electrolyte solution and the other end is exposed to the outside through the battery case and the cap assembly.

Claims (25)

1 . A secondary battery comprising:

a jelly roll-type electrode assembly impregnated with an electrolyte solution;

a battery case housing the electrode assembly and the electrolyte solution;

a cap assembly coupled with an upper portion of the battery case; and

a reference electrode having a first end immersed with the electrolyte solution and a second end exposed outside the battery case by extending between the battery case and the cap assembly, the reference electrode extending below a lowermost end of the electrode assembly such that the first end of the reference electrode is located below the lowermost end of the electrode assembly, the first end being bent to extend along the lowermost end of the electrode assembly.

2 . The secondary battery according to claim 1 ,

further comprising a gasket located between the battery case and the cap assembly to provide an airtight seal,

wherein the reference electrode is located between the battery case and the gasket.

3 . The secondary battery according to claim 2 ,

wherein the battery case and the cap assembly are crimp-coupled with the gasket and the reference electrode being interposed therebetween.

4 . The secondary battery according to claim 1 ,

wherein the reference electrode extends from the lowermost end of the electrode assembly along an outer peripheral surface of the electrode assembly and passes between the battery case and the cap assembly.

5 . The secondary battery according to claim 1 , further comprising a separating member that is located between the electrode assembly and the first end of the reference electrode,

wherein the electrode assembly includes a plurality of positive electrodes, a plurality of negative electrodes, and a separator interposed therebetween.

6 . The secondary battery according to claim 1 , further comprising an insulating tape that is located between the reference electrode and the battery case.

7 . The secondary battery according to claim 6 ,

wherein the insulating tape includes at least one of polyimide (PI), polyethylene terephthalate (PET), or polypropylene (PP).

8 . The secondary battery according to claim 6 ,

wherein the insulating tape is extended to cover the first end of the reference electrode.

9 . The secondary battery according to claim 1 ,

wherein the reference electrode includes a metal wire, and a coating layer surrounding the metal wire.

10 . The secondary battery according to claim 9 ,

wherein the coating layer includes an enamel layer.

11 . The secondary battery according to claim 1 ,

wherein the reference electrode includes a metal plate that is attached to the first end of the reference electrode.