Mist elimination system for electrochemical cells

Patent metadata

Field	Value
Publication number	US-2025210759-A1
Application number	US-202418826974-A
Country	US
Kind code	A1
Filing date	Sep 6, 2024
Priority date	Jul 22, 2016
Publication date	Jun 26, 2025
Grant date	—

Abstract

An electrochemical cell includes a mist elimination system that prevents mist from escaping from the cell chamber and conserves moisture within the cell. An exemplary mist elimination system includes a spill prevention device that reduces or prevents an electrolyte from escaping from the cell chamber in the event of an upset, wherein the electrochemical cell is tipped over. A mist elimination system includes a recombination portion that reacts with hydrogen to produce water, that may be reintroduced into the cell chamber. A mist elimination system includes a neutralizer portion that reacts with an electrolyte to bring the pH closer to neutral, as acid/base reaction. A mist elimination system includes a filter that captures mist that may be reintroduced into the cell chamber. A mist elimination system includes a hydrophobic filter on the outer surface to prevent water and other liquids from entering into the mist elimination system.

First claim

1 . (canceled)

2 . A mist elimination system for reducing mist in an electrochemical cell, the mist elimination system comprising:
a safety vent including a conduit defining a tortuous path positionable in fluid communication with an ionically conductive medium in a chamber of the electrochemical cell; and a mist elimination stack having a concave shape about the safety vent and, in a direction away from the safety vent, having layers including
a filter in which the ionically conductive medium from the safety vent is
drainable from the filter back to the electrochemical cell,

a hydrogen recombination catalyst reactable with hydrogen gas to form water,
a neutralizer media in which the ionically conductive medium moving through the hydrogen recombination catalyst is neutralizable, and
a hydrophobic filter preventing ingress of moisture while being permeable to air such that permeation of air through hydrophobic filter reaches the hydrogen recombination catalyst.

3 . The mist elimination system of claim 2 , wherein the tortuous path of the safety vent traverses back and forth.

4 . The mist elimination system of claim 2 , wherein the tortuous path of the safety vent defined by the conduit is a spiral.

5 . The mist elimination system of claim 2 , wherein the neutralizer media includes an acid component.

6 . The mist elimination system of claim 5 , wherein the acid component is solid acid.

7 . The mist elimination system of claim 5 , wherein the acid component is incorporated into carbon.

8 . The mist elimination system of claim 7 , wherein the acid component is liquid acid entrained in activated carbon.

9 . The mist elimination system of claim 2 , wherein the neutralizer media includes an absorbent.

10 . The mist elimination system of claim 9 , wherein the absorbent includes silica.

11 . The mist elimination system of claim 9 , wherein the absorbent includes a molecular sieve.

12 . The mist elimination system of claim 2 , wherein the neutralizer media includes a solid base.

13 . The mist elimination system of claim 2 , wherein the neutralizer media includes a liquid base entrained in activated carbon.

14 . The mist elimination system of claim 2 , wherein the neutralizer media is replenishable within the mist elimination stack.

Assignees

• Form Energy Inc

Inventors

• Krishnan Ramkumar
• Hayes Joel
• Klug Scott
• Samuleson Patrick
• Trzebny Craig

Classifications

• H01M50/35

  Gas exhaust passages comprising elongated, tortuous or labyrinth-shaped exhaust passages · CPC title

• H01M50/367

  Internal gas exhaust passages forming part of the battery cover or case; Double cover vent systems · CPC title

• H01M50/394

  Gas-pervious parts or elements · CPC title

• H01M50/392

  with means for neutralising or absorbing electrolyte; with means for preventing leakage of electrolyte through vent holes · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title