Method for manufacturing secondary battery and secondary battery manufactured using the same

Patent metadata

Field	Value
Publication number	US-2025293314-A1
Application number	US-202418821932-A
Country	US
Kind code	A1
Filing date	Aug 30, 2024
Priority date	Mar 15, 2024
Publication date	Sep 18, 2025
Grant date	—

Abstract

In a method for manufacturing a secondary battery, the method includes: electrically connecting a first current collector plate to the first electrode plate of an electrode assembly including: a first electrode plate; a second electrode plate; and a separator between the first electrode plate and the second electrode plate; pressing the first current collector plate in the direction of the electrode assembly by a setting pressing amount to press at least a portion of the separator that protrudes outward from the electrode assembly relative to the first electrode plate; and performing internal insulation treatment, wherein the pressing amount may be set based on a length of an initial gap between the first current collector plate and the separator and a length of an initial separator pressing allowance space between the separator and the first electrode plate.

First claim

What is claimed is:

1 . A method for manufacturing a secondary battery, the method comprising:
electrically connecting a first current collector plate to a first electrode plate of an electrode assembly comprising:
the first electrode plate;
a second electrode plate; and
a separator between the first electrode plate and the second electrode plate;
pressing the first current collector plate in a direction of the electrode assembly by a setting pressing amount to press at least a portion of the separator that protrudes outward from the electrode assembly relative to the first electrode plate; and performing internal insulation treatment, wherein the pressing amount may be set based on a length of an initial gap between the first current collector plate and the separator and a length of an initial separator pressing allowance space between the separator and the first electrode plate.

2 . The method as claimed in claim 1 , wherein pressing the first current collector plate comprises bringing the separator and the first current collector plate into close contact with each other, so that there is no gap between the separator and the first current collector plate.

3 . The method as claimed in claim 1 , wherein the initial separator pressing allowance space is set to a length obtained by subtracting a length between an end of the separator and a protruding position of the first electrode plate and a length between the protruding position of the first electrode plate and an aligned position of the first electrode plate from a length between the end of the separator and the aligned position of the first electrode plate.

4 . The method as claimed in claim 3 , wherein an area corresponding to the length between the protruding position of the first electrode plate and the aligned position of the first electrode plate is a reversal preventive area of positive and negative electrode positions.

5 . The method as claimed in claim 3 , wherein an area corresponding to the length between the end of the separator and the protruding position of the first electrode plate is a positive and negative electrode short preventive area.

6 . The method as claimed in claim 1 , wherein a length of the initial separator pressing allowance space is reduced after pressing the first current collector plate.

7 . The method as claimed in claim 1 , wherein an initial design width of the separator is reduced in length after pressing the first current collector plate.

8 . The method as claimed in claim 1 , after electrically connecting the first current collector plate to the first electrode plate, coupling a first insulation plate to one side of the first current collector plate.

9 . The method as claimed in claim 8 , wherein performing internal insulation treatment comprises attaching an insulation member to at least one side of the electrode assembly and the insulation plate.

10 . The method as claimed in claim 1 , further comprising pressing a side surface of the separator based on a longitudinal direction of the electrode assembly.

11 . The method as claimed in claim 1 , wherein the set pressing amount is set to 0.7% to 1.2% of a length between an outer surface of the first current collector plate before pressing the first current collector plate and the outer surface of a second current collector plate coupled to the other side of the first current collector plate.

12 . The method as claimed in claim 1 , wherein a length of the initial pressing allowance space is set to 0.84% to 0.86% of an initial design width of the separator.

13 . The method as claimed in claim 1 , wherein the changed length of the pressing allowance space after the pressing is 38% to 42% of a length of the initial pressing allowance space.

14 . A secondary battery manufactured by the secondary battery manufacturing method as claimed in claim 1 .

15 . The secondary battery as claimed in claim 14 , wherein an end of a separator and a first current collector plate are brought into close contact with each other without a gap.

16 . The secondary battery as claimed in claim 14 , wherein at least a portion of the first current collector plate may be interposed within an end of the separator.

17 . The secondary battery as claimed in claim 14 , comprising:
a case that accommodates the electrode assembly and the first current collector plate and is open on both sides; a first cap plate that seals one side opening of the case; and a first terminal that is electrically connected to the first current collector plate and is exposed to an exterior portion of the first cap plate.

18 . The secondary battery as claimed in claim 17 , further comprising a first protruding current collector plate that is connected to an outer surface of the first current collector plate and is in contact with and coupled to an inner surface of the first terminal.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Ki Tae

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M10/0468 Primary

  Compression means for stacks of electrodes and separators · CPC title

• H01M50/543

  Terminals · CPC title

• H01M50/586

  inside the batteries, e.g. incorrect connections of electrodes · CPC title