Battery Cell and Manufacturing Device for the Same

Patent metadata

Field	Value
Publication number	US-2023070655-A1
Application number	US-202117801357-A
Country	US
Kind code	A1
Filing date	Dec 21, 2021
Priority date	Dec 24, 2020
Publication date	Mar 9, 2023
Grant date	—

Abstract

A device for manufacturing a battery cell according to one embodiment of the present disclosure includes a sealing tool that forms a sealing part on the outer peripheral surface of a battery case to which an electrode assembly is mounted, wherein the sealing tool comprises a sealing surface that is brought into contact with the outer peripheral surface of the battery case, and wherein the sealing surface comprises a central surface and an inclined surface formed on at least one side of the central surface.

First claim

1 . A device for manufacturing a battery cell, comprising:
a sealing tool configured to form a sealing part on an outer peripheral surface of a battery case in which an electrode assembly is mounted, wherein the sealing tool comprises a sealing surface configured to be brought into contact with the outer peripheral surface of the battery case, and wherein the sealing surface comprises a central surface and an inclined surface extending from at least one side of the central surface.

2 . The device for manufacturing a battery cell according to claim 1 , wherein:
the inclined surface extends from the central surface in a width direction of the sealing tool.

3 . The device for manufacturing a battery cell according to claim 1 , wherein:
the sealing part is located on an outer peripheral surface of the battery cell through which an electrode lead protruding toward an outside of the battery case from the electrode assembly passes, and a lead film is located on upper and lower parts of the electrode lead, respectively.

4 . The device for manufacturing a battery cell according to claim 3 , wherein:
the sealing part comprises a first sealing part and a second sealing part, and the central surface is configured to face the first sealing part, and the inclined surface is configured to face the second sealing part.

5 . The device for manufacturing a battery cell according to claim 4 , wherein:
the device is configured such that in use, the central surface and the first sealing part, and the inclined surface and the second sealing part are sequentially brought into contact with each other.

6 . The device for manufacturing a battery cell according to claim 5 , wherein:
the device is configured such that in use, while the central surface is brought into contact with the first sealing part, the second sealing part is bent along an inclination angle of the inclined surface.

7 . The device for manufacturing a battery cell according to claim 4 , wherein:
the sealing surface is configured to form a heat-sealing part between the sealing part and the lead film.

8 . The device for manufacturing a battery cell according to claim 7 , wherein:
the heat-sealing part includes a first heat-sealing part and a second heat-sealing part, the central surface is configured to form the first heat-sealing part between the first sealing part and the lead film, and the inclined surface is configured to form the second heat-sealing part between the second sealing part and the lead film.

9 . The device for manufacturing a battery cell according to claim 8 , wherein:
the battery case is made of a film including an inner layer and an outer layer.

10 . The device for manufacturing a battery cell according to claim 9 , wherein:
the device is configured such that in use, a first material contained in the inner layer of the first sealing part is eluted in a direction away from the central surface.

11 . The device for manufacturing a battery cell according to claim 10 , wherein:
the inclined surface is configured to heat-seal the first material together with the inner layer of the second sealing part.

12 . The device for manufacturing a battery cell according to claim 11 , wherein:
the first material is contained in the second heat-sealing part.

13 . The device for manufacturing a battery cell according to claim 11 , wherein:
the device is configured such that in use, the first material is eluted to a first length on the basis of a boundary line between the central surface and the inclined surface.

14 . The device for manufacturing a battery cell according to claim 13 , wherein:
the device is configured such that in use, the width of the inclined surface is greater than or equal to the first length.

15 . The device for manufacturing a battery cell according to claim 1 , wherein:
the sealing tool includes a first sealing tool configured to press an upper of the battery case part and a second sealing tool configured to press a lower part of the battery case.

16 . A battery cell comprising:
an electrode assembly, and a battery case in which the electrode assembly is mounted and which has a sealing part on an outer peripheral surface, wherein the sealing part comprises a first sealing part and a second sealing part, wherein the second sealing part is bent to an inclination angle with respect to the first sealing part, and the second sealing part comprises a heat-sealing part.

17 . The battery cell according to claim 16 , wherein:
the sealing part is located on an outer peripheral surface of the battery case through which an electrode lead protruding toward an outside of the battery case from the electrode assembly passes, and a lead film is located on upper and lower parts of the electrode lead, respectively.

18 . The battery cell according to claim 17 , wherein:
the second sealing part comprises an inclined part and a flat part, and the heat-sealing part is formed between the flat part and the lead film.

19 . The battery cell according to claim 18 , wherein:
a first material contained in the inner layer of the first sealing part is eluted in a direction away from the central surface, and the flat part is heat-sealed together with the first material to form the heat-sealing part.

20 . The battery cell according to claim 19 , wherein:
the first material is contained in the heat-sealing part.

Assignees

• Lg Energy Solution Ltd

Inventors

• Min Minkyu
• Kim Daehong
• Kim Gi Man

Classifications

• B29L2031/3468

  Batteries, accumulators or fuel cells (battery cases B29L2031/7146) · CPC title

• B29C66/71

  characterised by the composition of the plastics material of the parts to be joined (welding bar compositions B29C65/125) · CPC title

• B29C66/83221

  cooperating reciprocating tools, each tool reciprocating along one axis · CPC title

• B29C66/112

  Single lapped joints · CPC title

• B29C66/53461

  joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies · CPC title