Battery Cell Stack, Method of Manufacturing the Same, and Alignment Mark Forming Apparatus for Forming Alignment Mark at the Battery Cell Stack

Patent metadata

Field	Value
Publication number	US-2024266626-A1
Application number	US-202318565938-A
Country	US
Kind code	A1
Filing date	May 24, 2023
Priority date	May 24, 2022
Publication date	Aug 8, 2024
Grant date	—

Abstract

The present invention relates to a battery cell stack in which a plurality of pouch-shaped battery cells is stacked. An alignment mark is formed at the bottom of a receiving portion configured to receive an electrode assembly in each of the plurality of pouch-shaped battery cells. The plurality of pouch-shaped battery cells is stacked such that the alignment marks individually formed at the pouch-shaped battery cells completely overlap each other in a stacking direction, and the alignment mark is a reference for measuring the dimensions of the pouch-shaped battery cells. Consequently, it is possible to manufacture a battery cell stack in which the plurality of pouch-shaped battery cells is accurately aligned with each other in the stacking direction.

First claim

1 . A battery cell stack in which a plurality of pouch-shaped battery cells is stacked,
each of the pouch-shaped battery cells includes at least one alignment mark formed at a bottom of a receiving portion configured to receive an electrode assembly, wherein the plurality of pouch-shaped battery cells is stacked such that the at least one alignment marks individually formed at the pouch-shaped battery cells are coaxial in a stacking direction.

2 . The battery cell stack according to claim 1 , wherein
the at least one alignment mark comprises a first alignment mark and a second alignment mark, and an imaginary connection line connecting the first alignment mark and the second alignment mark is parallel to an overall length direction of the pouch-shaped battery cell.

3 . The battery cell stack according to claim 1 , wherein the at least one alignment mark is at least one of an ink mark, a laser engraving, or a sticker.

4 . A method of manufacturing the battery cell stack according to claim 1 , the method comprising:
(a) placing a laminate sheet on a die; (b) pressing the laminate sheet using a punch to form a battery case; (c) forming the at least one alignment mark at a bottom of the battery case; (d) receiving the electrode assembly in the battery case and sealing the battery case to manufacture the pouch-shaped battery cell; and (e) stacking the pouch-shaped battery cell such that the at least one alignment mark of the pouch-shaped battery cell is coaxial with the at least one alignment mark of another pouch-shaped battery cell in a stacking direction, wherein step (c) is performed as a process of performing stamping, ink printing, laser beam irradiation, or sticker application at a constant position on the bottom of the battery case.

5 . The method according to claim 4 , wherein the step of forming the at least one alignment mark is performed in a state in which the laminate sheet is pressed using the punch.

6 . An alignment mark forming apparatus for forming the at least one alignment mark on the battery cell stack according to claim 1 , the apparatus comprising:
a die provided with a recess configured to form the receiving portion that receives the electrode assembly; a punch located above the die, the punch being configured to press a laminate sheet; and a marking member configured to form the at least one alignment mark at an outer surface of the bottom of the receiving portion at the laminate sheet.

7 . The alignment mark forming apparatus according to claim 6 , wherein the die is provided with at least two openings formed through a bottom of the recess in a direction perpendicular thereto.

8 . The alignment mark forming apparatus according to claim 7 , wherein each of the openings is formed on a straight line passing through a center line of an overall width of the die and parallel to an overall length of the die.

9 . The alignment mark forming apparatus according to claim 7 , wherein the marking member is inserted through each of the openings to form the at least one alignment mark.

10 . The alignment mark forming apparatus according to claim 6 , wherein the marking member is a stamping device, an ink printing device, a laser engraving device, or a sticker application device.

11 . The alignment mark forming apparatus according to claim 7 , wherein
the at least two openings comprise a first opening and a second opening, the first opening is formed at a center of the bottom of the recess of the die, and the second opening is formed on a straight line passing through the first opening and parallel to an overall length of the recess.

Assignees

• Lg Energy Solution Ltd

Inventors

• Roh Tae Hwan

Classifications

• B21D37/10

  Die sets; Pillar guides · CPC title

• H01M50/211

  adapted for pouch cells · CPC title

• H01M50/289

  characterised by spacing elements or positioning means within frames, racks or packs (spacing elements inside cells other than separators, membranes or diaphragms H01M50/471) · CPC title

• H01M10/488 Primary

  Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density · CPC title

• H01M10/0404

  Machines for assembling batteries · CPC title