# US 10,312,539 B1 · System and method for storage and retrieval of energy

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- Number: US 10,312,539 B1
- Document ID: US10312539B1
- Status: Granted
- Kind: B1
- Application number: 15/636,284
- Filed: 2017-06-28
- Granted: 2019-06-04
- Earliest claimed: 2017-06-28
- Applicants: David Joseph Strain
- Inventors: David Joseph Strain
- Web page: https://patentgrep.com/patent/US10312539B1

## CPC

- H01M 8/0656: by electrochemical means (H01M8/065 takes precedence)
- C25B 1/04: by electrolysis of water
- H01M 8/04089: of gaseous reactants
- H01M 8/04201: {Reactant storage and supply, e.g. means for feeding, pipes}
- Y02E 60/36: Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
- Y02E 60/50: Fuel cells
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C25B: ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR (anodic or cathodic protection C23F13/00; single-crystal growth C30B)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A system and method for storage and retrieval of energy includes storage of energy by performing electrolysis of water and directing the resulting hydrogen gas and oxygen gas to respective storage tanks. Energy is retrieved by directing hydrogen gas and oxygen gas from the storage tanks to a fuel cell where the hydrogen and oxygen are reacted to produce electricity and water. Water from the fuel cell is directed to a reservoir for subsequent electrolysis.

## Claims

### Claim 1

A method for storage and retrieval of energy comprising the steps of:
(a) storing energy by:
(i) performing electrolysis of water within a electrolysis vessel such that the water decomposes into hydrogen gas and oxygen gas;
(ii) directing the hydrogen gas through a first conduit and into a first storage vessel for storage therein; and
(iii) directing the oxygen gas through a second conduit and into a second storage vessel for storage therein;
(b) retrieving energy by:
(i) directing said hydrogen gas from said first storage vessel along a third conduit into a fuel cell;
(ii) directing said oxygen gas from said second storage vessel along a fourth conduit into said fuel cell; and
(iii) reacting the hydrogen gas and oxygen gas within the fuel cell to produce electricity and water,
and
(c) directing water from said fuel cell to a reservoir for subsequent electrolysis as in step a), above,
wherein the electrolysis vessel, first storage vessel, second storage vessel, fuel cell, and reservoir form a closed loop.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the water electrolyzed in step (a)(i) is provided at high pressure.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the water electrolyzed in step (a)(i) is directed from said reservoir to said electrolysis vessel along a fifth conduit.

### Claim 4 (depends on 3)

The method according to claim 3, wherein a pump associated with said fifth conduit draws water from said reservoir and forces the water into said electrolysis vessel at high pressure.

### Claim 5

A system for storage and retrieval of energy comprising:
a water reservoir;
an electrolyzer in fluid communication with said water reservoir;
a pump operable to draw water from said water reservoir and to direct said water into said electrolyzer;
a first storage vessel in fluid communication with said electrolyzer and configured to receive oxygen gas therefrom;
a second storage vessel in fluid communication with said electrolyzer and configured to receive hydrogen gas therefrom;
a fuel cell in fluid communication with said first storage vessel and said second storage vessel,
wherein the water reservoir, electrolyzer, first storage vessel, second storage vessel, and fuel cell form a closed loop.

### Claim 6 (depends on 5)

The system according to claim 5, wherein said fuel cell is in fluid communication with said water reservoir, and further wherein water produced by said fuel cell during operation thereof is directed to said water reservoir.

### Claim 7 (depends on 5)

The system according to claim 5, wherein said pump is configured to direct water into said electrolyzer at high pressure.