Electrochemical system

Patent metadata

Field	Value
Publication number	US-12305296-B2
Application number	US-202217830515-A
Country	US
Kind code	B2
Filing date	Jun 2, 2022
Priority date	Sep 29, 2021
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

An electrochemical system includes: a gas-liquid separator configured to separate a reaction fluid into a gaseous reaction fluid and a liquid reaction fluid; a first circulation line connected to the gas-liquid separator and configured to circulate the liquid reaction fluid; a water electrolysis stack provided in the first circulation line; a first pump provided in the first circulation line; a second circulation line connected to the gas-liquid separator in parallel with the first circulation line and configured to circulate the liquid reaction fluid; a property processing unit provided in the second circulation line and configured to process properties of the liquid reaction fluid; and a second pump provided in the second circulation line, thereby reducing a load of the pump and improving efficiency of the system.

First claim

What is claimed is:

1. An electrochemical system comprising:
a gas-liquid separator configured to separate a reaction fluid into a gaseous reaction fluid and a liquid reaction fluid;
a first circulation line connected to the gas-liquid separator and configured to circulate the liquid reaction fluid;
a water electrolysis stack provided in the first circulation line;
a first pump provided in the first circulation line;
a second circulation line connected to the gas-liquid separator in parallel with the first circulation line and configured to circulate the liquid reaction fluid;
a property processing unit provided in the second circulation line and configured to process properties of the liquid reaction fluid, wherein the property processing unit comprises at least one of an ion filter configured to filter out an ion from the liquid reaction fluid or a heat exchanger configured to exchange heat with the liquid reaction fluid;
a second pump provided in the second circulation line;
a supply line connected to the gas-liquid separator and configured to supply the liquid reaction fluid to the gas-liquid separator;
a nozzle connected to an outlet end of the first circulation line and configured to inject the liquid reaction fluid into the supply line along the supply line; and
an ejector disposed at an end of the nozzle.

2. The electrochemical system of claim 1 , wherein the property processing unit comprises the ion filter and the heat exchanger,
wherein the second circulation line comprises a branch line having a first end connected to the second circulation line and disposed between an inlet of the ion filter and the gas-liquid separator, and a second end connected to the second circulation line and disposed between an outlet of the ion filter and the gas-liquid separator, and
wherein the heat exchanger is provided in the branch line.

3. The electrochemical system of claim 2 , wherein the second pump is provided in the second circulation line and positioned at an upstream side of the branch line.

4. The electrochemical system of claim 2 , comprising:
an ion sensor provided in the first circulation line and configured to sense the ion contained in the liquid reaction fluid; and
a temperature sensor provided in the first circulation line and configured to sense a temperature of the liquid reaction fluid,
wherein the second pump adjusts a flow rate of the liquid reaction fluid passing through the second pump based on sensing results of at least one of the ion sensor or the temperature sensor.

5. The electrochemical system of claim 4 , comprising:
a valve provided in the second circulation line and disposed between the second pump and the ion filter,
wherein the valve adjusts the flow rate of the liquid reaction fluid to be supplied to the ion filter based on the sensing results of at least one of the ion sensor or the temperature sensor.

6. The electrochemical system of claim 1 , wherein the first pump is provided between an inlet of the water electrolysis stack and the gas-liquid separator.

7. The electrochemical system of claim 1 , wherein the outlet end of the first circulation line is connected to the supply line, and the liquid reaction fluid having passed through the first circulation line is supplied to the gas-liquid separator via the supply line.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Yang Seung Ki

Classifications

• Y02E60/36

  Hydrogen production from non-carbon containing sources, e.g. by water electrolysis · CPC title

• C25B15/087

  Recycling of electrolyte to electrochemical cell · CPC title

• C25B15/033

  Conductivity · CPC title

• C25B15/027

  Temperature · CPC title

• C25B15/085 Primary

  Removing impurities · CPC title