DEVICE FOR STORING AND RESTORING ELECTRICAL ENERGY
The present invention relates to a device for storing and restoring electrical energy.
The invention refers to the field of producing, storing and supplying electricity, including
those relating to the field of renewable energy, and more specifically to the field of
producing hydrogen and oxygen by water electrolysis and producing electricity by
hydrogen and oxygen fuel cells.
The fuel cell is an electrochemical device that converts chemical energy from a fuel into
electrical energy. The operating principle of this electrochemical generator is based on
the electrochemical synthesis reaction of water from an oxidizer, such as oxygen, and
from a fuel, such as hydrogen.
The operating principle of an electrolyzer is the reverse of that of a fuel cell. While the
fuel cell combines, by electrochemical reaction, dihydrogen and dioxygen to form water
and supply electricity, electrolysis disassociates water into its constituent elements, i.e.,
into hydrogen and oxygen, and requires electrical supply.
Therefore, associating an electrolyzer with a fuel cell so as to store electrical energy
produced by a source and to restore it on demand is known.
This association is especially known for storing electrical energy produced
intermittently or not intermittently, for example by renewable sources of energy, such
as wind or solar energy, but also by any primary source whatsoever. Therefore, the
electrical energy produced by the primary source is transformed by electrochemical
reaction, via the electrolyzer, into dihydrogen and into dioxygen, that are then stored
under pressure. The dihydrogen and dioxygen are then converted on demand into
electrical energy by means of a fuel cell when a customer electrical load needs
electricity that the grid cannot supply or when the primary source no longer produces
electricity or produces insufficient electricity with relation to the demand from the
downstream electrical load or electrical grid. Therefore, if the device is connected to the
electrical grid and supplies a customer, said device serves to restore electricity on
customer demand when the grid experiences power failures; And if the device is
connected to sources of renewable energy, the device is used to restore electricity
when the renewable source does not produce electricity or does not produce enough
electricity.
The various known systems are generally bulky and require significant space for their
installations. They are also not very modular or flexible, particularly as regards the
quantity of energy available, or electric capacity, that they are capable of supplying to
the customer grid. Lastly, on-site installations are relatively complex and difficult to
maintain. All these difficulties thereby limit a widespread distribution of electrolyzer/fuel
cell systems in industry.
In this context, the invention aims to propose a device for storing and restoring
electrical energy aiming to resolve the problems mentioned above.
For this purpose, the invention proposes a device for storing and restoring electrical
energy comprising:
water electrolysis means supplied at the inlet with water and electrical energy and
producing at the outlet at least dihydrogen and dioxygen in gaseous form;
means for storing said dihydrogen in gaseous form;
a fuel cell supplied at the inlet with at least the stored dihydrogen (H2) and producing
at the outlet at least the electrical energy;
monitoring/control means to control the operation of said device in fuel cell mode or in
electrolyzer mode;
char terized in that said device comprises:
a chamber in which said water electrolysis means, said fuel cell and said
monitoring/control means are arranged;
connection means enabling said chamber- to be connected to said storage means for
storing said dihydrogen outside of said chamber.
Therefore, thanks to the invention, the device for storing and restoring electrical energy
is formed by the combination of an electrolyzer and a fuel cell arranged in a sing ale
autonomous and compact chamber that limits the bulk of such a device. The ci:ur.,(j(,
means for the dihydrogen gas issued from water electrolysis are disposed separate!y
outside the chamber, which substantially reduces the space requirements of such a
device and adjusts its installation according to the various space constraints available
on site.
The arrangement of the electrolyzer and the fuel cell into a single chamber improves
and facilitates the on-site installation of such a device as well as its maintenance by
standardizing, pooling and reducing the elements necessary for operating the
electrolyzer and fuel cell. Thanks to the device according to the invention, maintenance
is carried out by the standard exchange of various elements constituting the device.
Therefore, the device for storing and restoring electrical energy according to the
invention comprising the electrolyzes and fuel cell arranged in a chamber, and means
for storing gas outside the chamber, enables rapid on-site installation by connecting the
chamber to the inlets and outlets necessary for operating the device while optimally
reducing the bulk.
The installation of the device according to the invention is carried out simply by
connecting the chamber to the primary electrical energy source, to a water source, to
the hydrogen storage means, to a source of or to a means for storing oxygen and to
the electrical grid.
The device for storing and restoring electrical energy according to the invention may
also present one or more of the characteristics below, considered individually or
according to all technically possible combinations:
the device comprises means for storing said dioxygen in gaseous form;
the device comprises connection means connecting said chamber to said storage
means for storing said dioxygen outside of said chamber;
said fuel cell is supplied at the inlet with said stored dioxyge
said connection means comprise a plurality of interfaces enabling a detachable and
impermeable connection of said storage means so as to make the means modular;
said chamber comprises means to convert electrical energy common to
electrolyzer and to said fuel cell;
;(I
said chamber comprises cooling means common to said electrolyzer and to said fuel
cell;
said chamber comprises at least one interface enabling a detachable connection of a
water supply and/or an electrical power supply and/or an electrical control supply;
said chamber comprises a water reservoir supplying said electrolyzer and storing the
water produced from said fuel cell;
said chamber is supplied at the inlet with a source of renewable energy and/or with a
source of fossil energy and/or with a source of nuclear energy.
the device comprises heat recovery means, notably a chamber cooling circuit.
Other characteristics and advantages of the invention will emerge more clearly from the
description provided below, for indicative and in no way limited purposes, with
reference to the attached figures, among which:
Figure 1 is a schematic representation of a first embodiment of a device according to
the invention;
Figure 2 is a schematic representation of a second embodiment of a device according
to the invention.
In all figures , common elements bear the same reference numbers, unless otherwise
stated.
Figure 1 schematically illustrates a first embodiment of a device for storing and
restoring electrical energy according to the invention.
Device 10 is connected to a primary electrical energy source 20 that may produce
electrical energy intermittently, for example by renewable energy, such as wind or solar
energy, but also by any primary source whatsoever, of the power plant type.
Device 10 enables, by chemical reaction, the primary electrical energy produced to be
converted in the form of storable gas. The gas thus produced and stored is then
transformed by reverse electrochemical reaction so as to reproduce electrical energy,
known as secondary energy, in case of need or the temporary suspension of the
primary electrical energy source.
For this purpose, device 10 according to the invention is formed by the combination of
a chamber 100 that is advantageously compact so as to be able to be easily installed
on site and by storage means 200 that are outside the chamber 100 and that are
connected to the chamber by connection means 140.
Chamber 100 is an autonomous chamber, for example of the metallic container or
housing type, in a substantially l;arallelepiped form that may be installed either inside
or outside a building. Advant,,U ;ou:,Iy, chamber 100 is installed outside a building so
as to not unnecessarily obstruct the internal space of the building. For this purpose,
chamber 100 is constructed so as to be able to withstand various meteorological
conditions. Therefore, chamber '100 is impermeable and impervious to adverse
weather (UV radiation, temperature variations, etc.).
The storage means 200 outside of chamber 100 are disposed either nearby or
relatively far from chamber 100.
Therefore, device 10 is likely to be implemented without difficulty under extreme
external conditions.
The modularity aspect mentioned here, independently from another modularity aspect
developed subsequently in the description, therefore adjusts the installation of device
10 according to the needs of users and to various space constraints. By way of
example, when chamber 100 is disposed inside a building, storage means 200 may be
disposed outside the building that houses chamber 100 of device 10 so that the
storage means do not occupy useful space on the site.
Chamber 100 comprises:
water electrolysis means 110, suc l ; ,, ; in electrolyzer;
6
a fuel cell 120;
monitoring/control means 130 to control the operation of device 10 in fuel cell mode or
in electrolyzer mode;
means to convert electrical energy 170;
means to cool (not represented) chamber 100
inlet interface 112;
outlet interface 114;
an interface 116 communicating with storage means 200.
Interfaces 112, 114, '116 are standard communication interfaces enabling
corn munication with other external elements to which charnber 100 is likely to be
associated. Interfaces 112, 114., 116 are conventional interfaces enabling a rapid and
impermeable detachable connection of the pipework for circulating fluid (H20) or gas
(H2 and 02), and/or a detachable electrical power connection and/or a detachable
electrical control connection.
Therefore , the inlet inte rface 112 and outlet interface 114 are interfaces comprising at
least one detachable electrical power connection and one detachable water pipework
connection.
Interface 116 is an interface comprising at least one detachable electrical control
connection and one detachable gas pipework connection, and advantageously a
detachable dihydrogen (H2) pipework connection and a detachable dioxygen (02)
pipework connection.
The inlet interface 112 is connected to the primary electrical energy source 20 but also
to a water system or to a water reservoir, advantageously single, outside of chamber
100.
The outlet interface 114 is connected to the electrical grid 30 of the user but also to the
water system or to the single water reservoir. The water inlet, via inlet interface 112,
supplies the electrolyzer 110 in electrolyzer° mode and the water outlet, via outlet
interface 114, evacuates the water produced by the fuel cell. Chamber 100 also
comprises water management means (not represented) controlling the water inlets and
outlets according to the operational mode of device 10, for example by a system of
valves controlled by the water management means.
According to a variation of the device according to the invention, the water reservoir
may be integrated inside chamber 100.
In the presence of a primary electrical supply, electrolyzer 110 dissociates water. into its
constituent elements in gas form, i.e., dihydrogen (112) and dioxygen (02).
The electrolysis of water (H20) is a well-known process that constitutes a means to
produce dihydrogen (112) and dioxygen (02) of high purity on request or on demand.
Conventionally, the electrolyzer 110 comprises a succession of elementary levels, also
known as electrochemical cells or electrolytic cells (stack), each of the electrolytic cells
being formed by at least one cathode, an electrolyte and an anode; The electrolyte
being gripped between the anode and the cathode. The cathode and the anode are
electrically conductive porous electrodes while the electrolyte is an electrically
insulating and ion (anion and proton) conductive membrane.
Under the effect of a potential difference between the two electrodes, thn r(:;+gent, i.e.,
water (H20), is dissociated into dihydrogen (H2) gas and dioxygen (02) gas.
The device 10 according to the invention therefore uses the principle of water
electrolysis to convert the electrical energy produced by the primary source 20 in the
form of dihydrogen ( 1-12) and dioxygen (02) gas.
The electrolyzer 110 is capable of operating at various pressures on a pressure range
substantially varying between atmospheric pressure and a few tens of bar.
The fuel cell 120 is also an electrochemical device converting the chemical energy of a
fuel into electrical energy according to the electrochemical synthesis reaction c i w. d(H r.
The operating principle of this electrochemical generator is based on the
electrochemical synthesis reaction of water from an oxidizer, dioxygen, and from a fuel,
dihydrogen. The operating principle of the fuel cell 120 is therefore the reverse of the
operation of the electrolyzer 110.
Conventionally, the fuel cell 120 also comprises a succession of electrolytic cells
(stack) formed by at least one anode, an electrolyte and a cathode; the electrolyte
being gripped between the anode and the cathode. The cathode and the anode are
electrically conductive porous electrodes while the electrolyte is an electrically
insulating and ion (anion and proton) conductive membrane.
In the fuel cell 120, the fuel, i.e., dihydrogen (HI2), is brought to the anode so as to
undergo catalytic oxidation, releasing protons and electrons in the case of a proton
exchange membrane. The ele trans produced circulate along the outer electrical
circuit, while the protons are transported from the electrolyte to the cathode, where they
combine with electrons and the oxidizer, i.e., dioxygen (02). This cathodic reduction is
accompanied by the production of water and the establishment of a potential difference
between the two electrodes that will be used to supply grid 30.
According to the embodiment illustrated, the electrolyzer 110 and the fuel cell 120 have
distinct electrolytic cells. According to another embodiment, the electrolyzer and the
fuel cell comprise at least one electrolytic cell in common, then called a reverse
electrolytic cell or stack.
Device 10 according to the invention operates according to two distinct modes of
operation: a first operating mode known as "electrolyzer mode" and a second operating
mode known as "fuel cell mode."
In the first embodiment, said electrolyzer mode, the primary source 20 provides
electrical energy to device 10. In this mode, the electrolyzer 100 converts the electrical
energy provided by the primary source 20 into storage chemical energy, i . e., it converts
the primary electrical energy into dihydrogen and into dioxygen in gaseous form.
The dihydrogen (H2) gas and the dioxygen (02) erns thus produced by water electrolysis
are channeled outside of the chamber 100 by ri it ^;,u i of interface 11 G.
Connection means 140, of the pipework type enabling the circulation of gas, are
connected to interface 116 so as to channel the gas to the storage means 200.
The dihydrogen (H2) gas is channeled, via the connection means 141, to the
dihydrogen (H2) storage means 210.
The dioxygen (02) gas is channeled, via the connection means 142, to the dioxygen
(02) storage means 220.
For this purpose, connection means 141 and 142 comprise a plurality of interfaces 122
distributed over the length of connection means 141, 142. Interfaces 122 are gas flow
interfaces and electrical control interlaces enabling a storage means 210, 220 to be
connected to device 10, particularly to a connection means 141, 142. Interfaces 122
may comprise a system of valves enabling the storage means 210, 220 to be isolated
on demand from the gas flow circulating in connection means 141, 142.
During the second mode of operation, known as the fuel cell mode, the dihydrogen (H2)
and dioxygen (02) stored in storage means 210 and 220 is channeled to chamber 100
via the respective connection means 141 and 142, and introduced into chamber 100
via interface 116 so as to be converted into electrical energy by fuel cell 120 of device
10.
Therefore, fuel cell 120 enables the dihydrogen (H2) stored in storage means 210 and
the dioxygen (02) stored in storage means 220 to be combined by electrochemical
reaction to form water and provide secondary electrical energy to an electrical grid 30.
Managing the switch from the first operational mode to the second operational mode is
carried out by monitoring/control means 130 that alternately activate either the
electrolyzer 110 of device 10, in electrolyzer operational mode, or the fuel cell 120 of
device 10, in fuel cell operational mode.
Switching the operational mode from the first mode to the second mode and conversely
is determined according to the parameters defined by the user. These parameters are
particularly dependent on the power level of the primary source 20. In case of
insufficient electrical power or ; + ,(n in case of a supply fault from the primary source 20,
--. 10
device 10 switches from electrolyzer mode to fuel cell mode so as to supply elcctrir: al
energy to the customer electrical load or to the electrical grid 30, known as second:_rry
electrical energy.
The gas storage means 200 formed by the distinct means for storing dihydrogen 210
and dioxygen 220 are, for example, tanks capable of storing pressurized gas.
The regulation and circulation of dihydrogen (H2) and dioxygen (02) gas inside chamber
100, but also between chamber 100 and storage means 200, are controlled by
monitoring/control means 130, by controlling a set of valves (not represented), for
example integrated into each interface 112, 114, 116, 122.
Therefore, connection means 141 and 142 channel the gas produced in electrolyzer
mode from chamber 100 to storage means 200, along the direction indicated by arrow
150, and channel the gas in the opposite direction, i.e., from storage means 200 to
chamber 100, as illustrated by arrow 160, in fuel cell mode.
Each of the valves of the device may be independently controlled in opening and
closing, such that the user may optimize the management of the gas flows of the
installation. The opening and closing of each storage means 200 therefore enables the
capacity of one or more specific storage means 210, 220 to be managed
independently, or else enables a specific storage nsieans to be filled and/or emptied on
a priority basis, for example for an inspection or for maintenance.
The valves of interfaces 122 combined with the valves of interface 116 also enable the
capacity of a storage means 21, 220 to be pumped over to a second storage means
210, 220, if necessary.
Advantageously, the valves from each interface are electrically controlled by the
monitoring/control means 130, the various interfaces 112, 114, 116, 122 being
electrically connected to the monitoring/control means 130.
Storage means 200 are therefore autonomous and modular elements of device 10 as it
is possible to add and/or remove the means in a simple and rapid manner. In fact,
storage means 200 also comprise an interface enabling the rapid impermeable
disassembly of a connection of the gas pipework type.
I I
Therefore, the addition of an additional storage means 210' (illustrated in dotted lines in
f=igure 1) is carried out simply by connecting or hooking up the storage means 210' to
one of the interfaces 122 by means of a gas pipework.
According to a second embodiment, the valves enabling the independent
opening/closing of storage means 200 are directly integrated with storage means 210,
220. In this embodiment, storage means 210, 220 comprise electrical connection
means for controlling the valve via the monitoring/control means 130 in addition to a
gas pipework connecting storage means 210, 220 to interface 122.
According to a variation of embodiment of the invention, the gas entering and departing
chamber 100 is channeled between chamber 100 and storage means 200 by two
different transport conduits, such that a storage means comprises two supply conduits
(one inlet conduit and one outlet conduit) connected with an interface 122 to device 10.
Means 170 for converting electrical energy adapts the power and current type from
primary source 20 to the power and current type necessary for operating electrolyzer
110. For, this purpose, means 170 are formed by an alternating current/direct current
(AC/DC) converter and/or by a direct currrerat/direct current (DC/DC) converter if, for
example , the primary source is a direct current source , such as for example
photovoltaic cells.
The same means 170 are also used for converting the electrical energy produced by
fuel cell 120 (of the direct current type) into alternating current or into direct current,
depending on the needs of grid 30. Means 170 may be cooled by a cooling circuit used
to cool the electrolyzer and the fuel cell.
The chamber 100 cooling means (not represented) cool chamber 100 and evacuate
the heat emitted by the electrochemical reactions of the fuel cell and the electrolyzer,
The cooling means are formed for example by a cooling circuit circulating between the
electrolytic cells of the fuel cell and/or the electrolyzer, by a ventilation system enabling
cooling of chamber 100 or else by a combination of a cooling circuit and a ventilation
system, or by any other type of cooling system conventionally used to cool a fuel cell or
an electrolyzer.
12
According to another embodiment, the heat recovered in chamber 100 by the cooling
circuit may be re-used to, for example, heat, cool or air condition (by using an
additional device) the building in which device 10 is located, or may possibly be stored
for a later use, still for a heating, cooling or air-conditioning use.
In a conventional manner, chamber 100 may also comprise means to purify the gas
produced in electrolyzer mode so as to separate the water in vapor form present in the
electrolyzer 110 products and also to eliminate traces of impurities in the gas such as
oxygen in hydrogen and vice versa.
Chamber 100 may also comprise humidification means enabling the gas stored in the
storage means to be humidified with water vapor before it is channeled to the fuel cell
120.
The chamber may also comprise compression means enabling the gas produced by
electrolyzer 110 to be pressurized before being stored in the storage means.
Advantageously, chamber 100 has a length of about ten meters and a few meters in
width and in height.
Therefore, chamber 100 forms a compact and autonomous container enabling
electrical energy to be stored and restored, comprising a fuel cell, an electrolyzer and
the various elements necessary for their operation, with the exception of gas storage
means, which are voluminous.
By way of example, a container with dimensions of 12 m x 2.40 m x 2.30 m is sufficient
for receiving a 500kW fuel cell and a 70Nm3/h electrolyzer as well as the various
elements necessary for their operation.
According to a second embodiment of the invention, device 10 only comprises
dihydrogen storage means 220. In this embodiment, the chamber disposes an outlet
valve (not represented) allowing the dioxygen, produced in electrolyzer mode, to
escape into the ambient atmosphere as well as an inlet valve enabling the fuel cell to
be supplied with dioxygen, by admitting air, in fuel cell operational mode. In another
example of embodiment, the dioxygen is recovered to be used for other purposes, for
example in the chemical industry.
13
Preferentially, the dioxygen (02) outlet valve and the inlet valve are made from a single
valve.
This second embodiment therefore reduces the space allocated for gas storage for
operating the device but also optimizes the allocated space so as to increase the
dihydrogen storage capacity, which directly affects the electrical energy restoring
capacity of the device.
Thanks to the externalization of chamber 100 storage means 200, it is possible to
simply adjust the capacity and/or number of tanks dedicated to gas storage in order to
adapt device 10 to the needs of the user according to the electrical energy capacity
required.
Therefore, for a same chamber 100, i.e., with an electrolyzer 110 and a fuel cell 120 of
fixed capacity, it is possible to vary the storage capacity and therefore the electrical
energy restoration capacity, i.e., the length of time during which device 10 is capable of
providing a given electrical power volume.
The modularity and rapid and simplified disassembly of the various elements
constituting the device, such as reversible electrolytic cells, gas storage means, gas
pipework, interfaces and the chambers themselves, enable a device for storing and
restoring electrical energy to be obtained that is completely parameterable and
adjustable according to the needs of each user.
According to a second embodiment illustrated in Figure 2, combining several chambers
100 such as previously described is possible, so as to adjust the power or gas storage
capacity according to user demand. In the example illustrated, the second chamber
100' is connected to the first chamber 100. The gas thus produced or necessary for
producing secondary electrical energy is stored by the same storage means 200.
The connection of several chambers is carried out simply by the parallel hookup of the
various interfaces of each chamber in the following manner:
14
the inlet interface 112' of the second chamber 100' is connected to the inlet interface
112 of the first chamber 100, for example by means of a fluid circulation pipework and
an electrical power connection;
the outlet interface 114' of the second chamber 100' is connected to the outlet
interface 114 of the first chamber 100, for example by means of a fluid circulation
pipework and an electrical power connection;
the interface 116' of the second chamber 100' is connected to the interface 116 of the
first chamber 100, for example by means of gas circulation pipework and an electrical
control connection.
The electrolyzer of the device according to the invention is either, for example, an
electrolyzer of the proton exchange membrane (PEM) type , an electrolyzer of the
alkaline type , a high-temperature electrolysis (IHHTE) electrolyzer, a solid oxide
electrolysis cell (S CHI= C;) electrolyzer, or else a combination of these various
electrolyzer technologies.
The fuel cell of the device according to the invention is either , for example, a proton
exchange membrane (PEM) fuel cell , a phosphoric acid fuel cell ('AFC), a solid oxide
fuel cell (SOFC), a molten carbonate fuel cell (MCFC), an alkaline fuel cell, a direct
methanol fuel cell (DMFC ) or else a combination of these various fuel cell technologies.
The various elements of the device according to the invention may comprise a flatness
management system in order to be able to be installed on any site whatsoever,
prepared or not.
The device according to the invention also simplifies the maintenance of Such a device
by standardizing the various elements constituting the device.
Other advantages of the invention are, in particular, as follows:
simplified commercial production by standardizing the various elements constitutin
the device;
reduced manufacturing costs;
15
modularity of the device so as to obtain the required electrical power;
reduced environmental impact by the selective disassembly and/or re-use of elements
in future utilizations.
WO 2011/131622 Al

CLAIMS
1. A device (10) for storing and restoring electrical energy comprising:
water electrolysis means (110) supplied at the inlet with water and
electrical energy and producing at the outlet at least dihydrogen (H2) and
dioxygen (02) in gaseous form;
means for storing (210) said dihydrogen (1-12) in gaseous form;
a fuel cell (120) supplied at the inlet with at least the stored dihydrogen
(H2) and producing at the outlet at least the electrical energy;
monitoring/control means (130) to control the operation of said device
(10) in fuel cell mode or in electrolyzer mode; characterized in that said
device (10) comprises:
a chamber ( 100) in which said water electrolysis means (110), said fuel
cell (120) and said monitoring/control means ( 130) are arranged;
connection means (141) enabling said chamber (110) to be connected to
said storage means (210) for storing said dihydrogen (l-12) outside of said
chamber (110).
2. The device (10) for storing and restoring electrical energy according to the
previous claim characterized in that the device comprises means for storing
(220) said dioxygen (02) in gaseous form.
3. The device (10) for storing and restoring electrical energy according to claim 2
characterized in that said device comprises connection means (142) connecting
said chamber (110) to said means for storing (220) said dioxygen (02) outside of
said chamber (110).
4. The device (10) for storing and restoring electrical energy according to claim 3
characterized in that said fuel cell (120) is supplied at the inlet with said stored
dioxygen (02).
5. Ti ie device, ( 10) for storing and re^ itorirrcl . Ie caaic,aal errerc, jy acccordincj to one of
cls- ms 1 to 4 characterized in that said con nection mean s (141, 142) ccarnptise ;a
plurality of into rlaac.a ('122) cartaabling an iniperrrreaable and detachable
connectio n of storage means (210, 220) so as to rake the means modular.
The device (10) for storing and reworing electrical energy according to one of
claims 1 to 5 c haaracterized in that mud chamber (100) comprise.,,--^ means for
converting electrical energy corrunon to said electrolyzer° (110) and to s adcl fuel
cell (120).
7. The device (10 ) for storing and restoring electrical energy according to one of
claims I to G characterized in that said chamber (100) comprises) coolincj mean ;
common to said electrolyzer° ( 110) and to said fuel cell (120).
The device (10) for storing a nd restoring electrical energy according to one of
claims 1 to 7 characterized in that said chamber (100 ) compr ses at least one
interface ( 112, '114, '116) enabling a detachable connection of a water supply
and/or a n elect tricaal power supply and/or an electrical control supply.
The device (10) for storing and restoring electrical energy according to one of
claims I to 8 characterized in that said Camber (100) compri a water
reservoir supplying said electrolyzer° (110) and enabling the wai.c^r prod iced
from said fuel cell (120) to be stored.
10. The device (10) [or storing and restoring electrical energy according to one of
claims 1 to 9 characterized in that said chamber (100) is sr.rpplied at the inlet
with a source (20) of renewable energy and/or with a source of fossil energy
and/or with a source of nuclear energy.
The device (10) for storing and restoring electrical energy according to one of
claim", I to 1 0 characterized in that the device cornpnscis heal: recovery 1-nears,
particularly a circuit for cooling the chamber (100).