Degassing system of pouch for secondary battery

Patent metadata

Field	Value
Publication number	US-2021408635-A1
Application number	US-202117354271-A
Country	US
Kind code	A1
Filing date	Jun 22, 2021
Priority date	Jun 26, 2020
Publication date	Dec 30, 2021
Grant date	—

Abstract

A degassing system of a pouch for a secondary battery is provided. In the degassing system, after inhaling gas regardless of the size of a cell pocket, the gas may be processed, and the convenience of work may be increased by setting the period of degassing time or the amount of gas to be discharged according to the size of a pouch, and an abnormality in a suction line for degassing may be automatically detected according to a comparison value by comparing the amount of discharged gas with a reference value preset by each pouch size.

First claim

What is claimed is:

1 . A degassing system of a pouch for a secondary battery, for removing gas from the pouch with a sealed edge, the degassing system comprising:
a separation unit including a suction passage for adsorption of the pouch, and forming a space inside of the pouch by pulling the pouch; a gas discharge unit installed on the separation unit, configured to pierce the pouch with a needle having a gas discharge path therein, and to discharge gas inside of the pouch through the gas discharge path; and a foreign substance removing unit removing a discharge mixed with gas respectively flowing into the separation unit and the gas discharge path.

2 . The degassing system of claim 1 , wherein the foreign substance removing unit includes:
a first suction line connected to the suction passage, a first trap tank connected to the first suction line, a first suction pump connected to the first trap tank and configured to provide adsorption force required for pouch adsorption to the separation unit while suctioning a discharge mixed with gas through a suction operation, a second suction line connected to the gas discharge path, a second trap tank connected to the second suction line, and a second suction pump connected to the second trap tank and suctioning a discharge mixed with gas through a suction operation.

3 . The degassing system of claim 2 , further comprising a filter respectively connected to the first suction line and the second suction line, and filtering the discharges mixed with gas.

4 . The degassing system of claim 2 , further comprising,
a first vacuum pressure sensor sensing pressure in the first suction line,
a solenoid valve connected to the first suction line and configured to open or close the first suction line according to presence or absence of detection of the first vacuum pressure sensor,
a second vacuum pressure sensor sensing pressure in the second suction line, and
a precision control valve connected to the second suction line and configured to open or close the second suction line according to presence or absence of detection of the second vacuum pressure sensor.

5 . The degassing system of claim 4 , further comprising,
a first kitz valve connected to the solenoid valve by the first suction line, and a second kitz valve connected to the precision control valve by the second suction line.

6 . The degassing system of claim 2 , further comprising,
a first pressure control valve adjusting an opening range of the first suction line such that a suction force of the first suction pump acting on the first suction line is changed, depending on a size of the pouch, and
a second pressure control valve adjusting an opening range of the second suction line such that a suction force of the second suction pump acting on the second suction line is changed, depending on the size of the pouch.

7 . The degassing system of claim 2 , further comprising a first residual pressure removing unit removing residual pressure present in the first suction line after completing the removal of the discharge mixed with gas from the inside of the separation unit,
wherein the first residual pressure removing unit includes, a first connection line connected to the first suction line, and a first air regulator supplying air to the first connection line such that air is introduced into the first suction line.

8 . The degassing system of claim 2 , further comprising a second residual pressure removing unit removing residual pressure present in the second suction line after completing the removal of the discharge mixed with gas from the inside of the gas discharge path,
wherein the second residual pressure removing unit includes, a second connection line connected to the second suction line, and a second air regulator supplying air to the second connection line such that air is introduced into the second suction line.

9 . The degassing system of claim 2 , further comprising,
a control unit in which a period of degassing time through the second suction line or a gas discharge amount is set according to the size of the pouch, and
a sensor unit measuring an amount of gas discharged from the second suction line in response to a control signal of the control unit and transmitting measurement results to the control unit,
wherein the control unit compares the gas discharge amount measured by the sensor unit with a reference value predefined for each size of the pouch, and detects an abnormality in the second suction line according to a comparison value.

Assignees

• Sk Innovation Co Ltd
• Rs Auto Co Ltd

Inventors

• Byun Jae Gyu
• Kim Dong Ju
• Kim Jin Go
• Lee Seung Noh
• Jeong Taek Eon
• Kim Deok Kun
• Lee Kang Min

Classifications

• H01M50/691

  Arrangements or processes for draining liquids from casings; Cleaning battery or cell casings · CPC title

• H01M50/60

  Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings · CPC title

• H01M50/105 Primary

  Pouches or flexible bags · CPC title

• H01M10/04 Primary

  Construction or manufacture in general (H01M10/058, H01M10/12, H01M10/28, H01M10/38 take precedence) · CPC title

• B01D35/02

  Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks, (B01D35/05 takes precedence; {water pipe system filters E03B3/18, E03B7/07; dirt catchers in sewers E03F; filters or strainers for pipe-lines in general B08B, E03F; object or dirt catching devices in sinks or the like E03C1/26; suction strainers or filters for pumps F04B53/005, F04D29/70}) · CPC title