Pouch case, pouch type secondary battery and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-11705595-B2
Application number	US-202117493953-A
Country	US
Kind code	B2
Filing date	Oct 5, 2021
Priority date	Sep 30, 2019
Publication date	Jul 18, 2023
Grant date	Jul 18, 2023

Abstract

Provided are a pouch case for a pouch type secondary battery in which one corner is in close contact with a cooling plate and a pouch type secondary battery including the same. In the pouch case, by controlling a shape relation among a forming portion formed to have a non-zero depth determined in advance at a center to accommodate one side of an electrode assembly, a receiving portion in surface contact with a side surface of the electrode assembly at the time of sealing the pouch case, and a sealing portion for sealing opposing ends of the forming portion and the electrode assembly, a size of a sealing protrusion formed after the electrode assembly is packaged through mechanical properties of a metal laminate sheet and a simplified die and punch may be minimized.

First claim

What is claimed is:

1. A pouch case for enclosing an electrode assembly including a plurality of electrode bodies stacked with a separator interposed therebetween, the pouch case comprising:
a forming portion formed to have a predetermined depth at a center and accommodating one edge of the electrode assembly;
a sealing portion provided at an outer periphery of the forming portion and sealing the accommodated electrode assembly;
a notch portion provided in the sealing portion at opposing ends of the forming portion in a vertical direction; and
a receiving portion brought into surface contact with a side surface of the electrode assembly when the pouch case is sealed,
wherein the forming portion includes a bottom portion in which the edge of the electrode assembly is seated, and
the receiving portion is connected at both ends of the forming portion and includes a forming connection portion formed on one side and connected to the forming portion and a sealing connection portion formed on the other side and connected to the sealing portion to have a predetermined angle with respect to the forming portion,
wherein the notch portion is spaced apart from the opposing ends of the bottom portion of the forming portion by a predetermined interval to have a step with the bottom portion.

2. The pouch case of claim 1 , wherein
the bottom portion of the forming portion and the one edge of the electrode assembly are in contact with each other.

3. A secondary battery module including a pouch type secondary battery including an electrode assembly including a plurality of electrode bodies stacked with a separator interposed therebetween and the pouch case of claim 1 ; and a cooling plate cooling the pouch type secondary battery,
wherein the forming portion of the pouch case is in surface contact with the cooling plate.

4. The pouch case of claim 1 , wherein
a sealing protrusion is formed on the sealing portion through the notch portion when the pouch case is sealed,
the sealing protrusion is located at a position higher than a bottom surface of the forming portion.

5. A method of manufacturing a pouch type secondary battery of claim 1 , the method comprising:
a sheet arrangement operation of disposing a metal laminate sheet;
a forming operation of pressing the sheet with a punch to form a shape of a pouch case in a single process under preset temperature and pressure pressing conditions by predicting measured mechanical properties of the sheet;
an electrode assembly insertion operation of inserting and aligning one edge of an electrode assembly to the forming portion of the pouch case; and
a pouch case sealing operation of sealing the sealing portion of the pouch case.

6. The method of claim 5 , further comprising:
a preparation operation of preparing a die having a cavity formed at a center before the sheet arrangement operation,
wherein the forming operation is performed by pressing the punch between the cavity after the sheet arrangement operation.

Assignees

• Sk Innovation Co Ltd
• Sk On Co Ltd

Inventors

• Kang Hee Gyoung
• Kim Tae Ii

Classifications

• H01M50/183 Primary

  Sealing members · CPC title

• H01M10/0436

  Small-sized flat cells or batteries for portable equipment · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M50/531

  Electrode connections inside a battery casing · CPC title

• H01M50/543

  Terminals · CPC title