Unit Cell and Battery Cell Including the Same

Patent metadata

Field	Value
Publication number	US-2026100470-A1
Application number	US-202519416913-A
Country	US
Kind code	A1
Filing date	Dec 11, 2025
Priority date	May 24, 2021
Publication date	Apr 9, 2026
Grant date	—

Abstract

A unit includes an electrode positioned between a first separator and a second separator in a stack. A first adhesive is positioned between the electrode and at least one of the first and second separators, and a second adhesive is positioned between the first separator and the second separator. The first adhesive composition has a degree of dispersion in an electrolyte that is larger than a degree of dispersion of the second adhesive composition in the electrolyte.

First claim

1 . A method of fabricating a unit cell, comprising:
applying a first adhesive to either or both of (i) a first face of an electrode or (ii) an abutment region of a first separator; applying the first adhesive to either or both of (i) a second face of the electrode or (ii) an abutment region of a second separator, the second face of the electrode being on an opposite side of the electrode from the first face; applying a second adhesive to either or both of (i) a peripheral region of the first separator or (ii) a peripheral region of the second separator; and forming at least a portion of a stack by stacking the electrode between the first separator and the second separator such that the first face of the electrode abuts the abutment region of the first separator and the second face of the electrode abuts the abutment region of the second separator, the stack being formed such the peripheral region of each of the first and second separators extends outwardly beyond an edge of the electrode, the peripheral regions of each of the first and second separators opposing one another without the electrode interposed therebetween; wherein the first adhesive is configured to have a degree of dispersion in an electrolyte that is greater than a degree of dispersion of the second adhesive in the electrolyte.

2 . The method of claim 1 , wherein the degree of dispersion of the first adhesive in the electrolyte is greater than the degree of dispersion of the second adhesive in the electrolyte.

3 . The method of claim 1 , wherein the peripheral region of each of the first and second separators extends around a perimeter of the respective first and second separator, such that each of the peripheral regions encircles the abutment region of the respective first and second separator.

4 . The method of claim 1 , wherein:
the first adhesive is composed of at least one of an ethylene-vinyl acetate (EVA)-based material, an acrylic-based material, and an epoxy-based material, and the second adhesive is composed of at least one of an ethylene-vinyl acetate (EVA)-based material, an acrylic-based material, an epoxy-based material, a polyolefin-based material, a rubber-based material, a polyamide-based material, and a polyurethane-based material.

5 . The method of claim 1 , wherein the first adhesive and the second adhesive are each applied in a respective pattern of dots spaced apart from each other.

6 . The method of claim 5 , wherein the dots in the pattern of dots of the first adhesive are arranged in a grid of rows and columns of dots.

7 . The method of claim 1 , wherein the first separator and the second separator are each respective portions of an elongated separator folded to have a zigzag shape.

8 . A method of fabricating a battery cell, comprising:
forming a stack formed by alternately stacking a plurality of the unit cells of claim 1 , and positioning the stack and an electrolyte in a battery case.

9 . The method of claim 8 , further comprising dissolving at least a portion of the first adhesive into the electrolyte.

10 . The method of claim 8 , wherein the electrolyte is a solution composed of at least one of an organic liquid electrolyte, an inorganic liquid electrolyte, a solid polymer electrolyte, a gel-type polymer electrolyte, a solid inorganic electrolyte, and an inorganic molten electrolyte.

11 . The method of claim 8 , wherein a total amount of the first adhesive in the battery case is from 0.6% to 0.9% by weight of a total amount of the electrolyte in the battery case.

12 . The method of claim 8 , wherein a total amount of the second adhesive in the battery case is from 0.1% to 0.45% by weight of a total amount of the electrolyte in the battery case.

13 . The method of claim 8 , wherein a total amount of the first adhesive and the second adhesive together in the battery case is from 0.8% to 1.2% by weight of a total amount of the electrolyte in the battery case.

14 . The method of claim 13 , wherein the total amount of the first adhesive in the battery case is from 0.6% to 0.9% by weight of the total amount of the electrolyte in the battery case, and wherein the total amount of the second adhesive in the battery case is from 0.1% to 0.45% by weight of the total amount of the electrolyte in the battery case.

15 . The method of claim 8 , wherein the second adhesive is composed of at least one of a polyolefin-based material, a rubber-based material, a polyamide-based material, and a polyurethane-based material.

16 . The method of claim 15 , wherein a total amount of the second adhesive in the battery case is from 0.1% to 0.2% by weight of a total amount of the electrolyte in the battery case.

Assignees

• Lg Energy Solution Ltd

Inventors

• Jeong Hyeok
• Choi Seong Won
• Lee Yong Jun
• Jung Su Taek
• Kwon Soon Kwan
• Bae Sangho
• Kim Minwook

Classifications

• H01M50/198

  characterised by physical properties, e.g. adhesiveness or hardness · CPC title

• H01M50/461

  with adhesive layers between electrodes and separators · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title