CN112665432A - Energy storage system and method - Google Patents
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- CN112665432A CN112665432A CN201910978693.4A CN201910978693A CN112665432A CN 112665432 A CN112665432 A CN 112665432A CN 201910978693 A CN201910978693 A CN 201910978693A CN 112665432 A CN112665432 A CN 112665432A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 182
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000003860 storage Methods 0.000 claims abstract description 151
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000011261 inert gas Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/14—Thermal energy storage
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Abstract
The embodiment of the invention provides an energy storage system and method, relating to the technical field of energy storage; wherein, the energy storage system includes: the energy storage device comprises an energy exchange device and N storage containers, wherein the N storage containers can be used for storing energy storage media in different energy states; the volume of each storage container is greater than or equal to Vm/(N‑1)，VmN is a positive integer greater than 2 and is the total volume of the energy storage medium; the N storage containers are arranged in parallel and connected to the energy exchange device through a main pipeline; and a first valve bank is arranged on each branch pipeline where the storage container is located. The embodiment of the invention can change the minimum total volume requirement of the storage container from 2VmDown to VmN/(N-1), the manufacturing cost of the storage container is reduced, and the occupied area is saved.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to an energy storage system and method.
Background
The supply and demand of energy usually have strong temporal and spatial difference, and the energy storage system can collect and store the surplus energy in a period of time and release the energy when the energy demand is on peak, thereby improving the utilization rate of the energy. Energy storage systems typically store energy in the form of thermal, chemical, or potential energy in a particular energy storage medium. In a system for storing energy by utilizing heat energy, chemical energy and the like, the energy storage medium can be converted between a high-energy state and a low-energy state, the energy storage media in the two states can not be stored in a mixed mode generally, two sets of storage containers capable of containing all the energy storage media are arranged in the prior art, so that the energy storage media in the high-energy state and the energy storage media in the low-energy state are stored respectively, the manufacturing cost of the storage containers is high, and the occupied area is large.
Disclosure of Invention
The embodiment of the invention provides an energy storage system and an energy storage method, which aim to solve the problems of higher manufacturing cost and larger occupied area of a storage container in the prior art.
In order to solve the technical problem, the invention is realized as follows:
an embodiment of the present invention provides an energy storage system, including: the energy storage device comprises an energy exchange device and N storage containers, wherein the N storage containers can be used for storing energy storage media in different energy states;
the volume of each storage container is greater than or equal to Vm/(N-1)，VmN is a positive integer greater than 2 and is the total volume of the energy storage medium;
the N storage containers are arranged in parallel and connected to the energy exchange device through a main pipeline;
and a first valve bank is arranged on each branch pipeline where the storage container is located.
Optionally, the number of the first valve banks on the branch pipeline where each storage container is located is 2, and the first valve banks are respectively arranged at two ends of the storage container.
Optionally, the first valve block comprises one or more valve units; the valve unit comprises one or more valves;
when the first valve block includes a plurality of valve units, the plurality of valve units are arranged in parallel.
Optionally, the energy exchange device comprises an energy storage sub-device and an energy release sub-device arranged in parallel;
and a second valve bank is arranged on the branch pipeline where the energy storage sub-device is located, and a third valve bank is arranged on the branch pipeline where the energy release sub-device is located.
Optionally, the system further comprises a pump structure, wherein the pump structure is mounted on the main pipeline.
Optionally, each of the storage containers is provided with an insulating layer on at least the inner wall.
Optionally, the energy exchange device comprises a heating device, and the heating device is arranged in parallel with the energy exchange device.
Optionally, a protective gas interface is provided on each storage container.
Optionally, the first valve block is an electric valve block.
The embodiment of the invention also provides an energy storage method, which is applied to the energy storage system and comprises the following steps:
the method comprises the steps that a first energy state energy storage medium in a first storage container is conveyed to an energy exchange device, and a second energy state energy storage medium obtained through conversion of the energy exchange device is conveyed to a second storage container;
after the first energy state energy storage medium in the first storage container is conveyed, conveying the first energy state energy storage medium in a third storage container to the energy exchange device, and conveying a second energy state energy storage medium obtained by conversion through the energy exchange device to the first storage container;
the first storage container and the third storage container are both storage containers in which energy storage media in a first energy state are stored in the N storage containers, the second storage container is a storage container in which any one of the N storage containers is in an empty state, and the energy storage media in the first energy state and the energy storage media in the second energy state are energy storage media in different energy states.
According to the embodiment of the invention, the N storage containers are arranged, and at least one storage container is vacated for rolling storage of the energy storage medium in the energy storage or release process, so that the minimum total volume requirement of the storage containers can be changed from 2VmDown to VmN/(N-1), reduces the manufacturing cost of the storage container and saves floor space.
Drawings
Fig. 1 is a schematic structural diagram of an energy storage system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an energy storage system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of one possible configuration of a storage container according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an energy storage system including a heating device according to an embodiment of the present invention.
The figures show that: an energy exchange device 1; an energy storage sub-device 11; an energy release sub-device 12; a storage container 2; an energy storage medium inlet 21; an energy storage medium outlet 22; a shielding gas port 23; a thermal insulation layer 24; a first valve group 31; a second valve group 32; a third valve group 33; a fourth valve block 34; a fifth valve group 35; a pump structure 4; a heating device 5.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
As shown in fig. 1, an energy storage system provided in an embodiment of the present invention includes: an energy exchange device 1 and N storage containers 2, each of the N storage containers 2An energy storage medium operable to store different energy states; the volume of each storage container 2 is greater than or equal to Vm/(N-1)，VmN is a positive integer greater than 2 and is the total volume of the energy storage medium; the N storage containers 2 are arranged in parallel and connected to the energy exchange device 1 through a main pipeline; each branch pipeline where the storage container 2 is located is provided with a first valve group 31.
The energy storage system provided by the embodiment of the invention can be used for storing and releasing heat energy or chemical energy, and accordingly, the energy exchange device 1 can be a device for energy transfer, such as a heat exchanger, and can also be a device for energy conversion, such as an electrochemical reaction cell. The following description will be made mainly with respect to an energy storage system in the form of thermal energy as an example.
The energy storage medium may be a medium in a fluid form such as water, heat transfer oil, or molten salt, and circulates between the energy exchange device 1 and the storage container 2. The energy storage medium can be switched between a high energy state and a low energy state by absorbing or releasing energy, and in the thermal energy storage, the high energy state and the low energy state are represented as different temperatures of the energy storage medium.
The energy storage containers 2 may be of the tank or tank type, each storage container 2 having a volume greater than or equal to VmAnd (N-1) so that at least one storage container can be left empty during energy storage or release, while ensuring that all energy storage media are stored.
Taking an empty storage container as an example, during the energy storage process, the first N-1 storage containers are all used for storing the storage medium in a low energy state, the Nth storage container is in an empty state, the energy storage medium in one of the previous N-1 storage containers is extracted during energy storage, in the energy exchange device 1, the energy storage medium is converted into a high-energy state by absorbing external energy, then storing the empty storage container in the Nth storage container (i.e. the storage container in the empty state), and after the process is finished, a new storage container in the empty state appears, and continues to receive and store the energy storage medium in a high energy state from the energy exchange device 1 in the subsequent energy storage process, all the energy storage media in the low energy state can be converted into the energy storage media in the high energy state through rolling, and the energy storage media are stored.
The energy releasing process is similar to the energy storing process, the first N-1 energy storing containers are all used for storing energy storing media in a high energy state, the Nth energy storing container is in an empty state, the energy storing media in one of the first N-1 energy storing containers are extracted during energy releasing, the energy storing media are converted into a low energy state in the energy exchanging device 1 by releasing energy outwards and then stored in the Nth energy storing container (namely the energy storing container in the empty state), a new storage container in the empty state appears after the process is completed, the energy storing media in the low energy state from the energy exchanging device 1 are continuously received and stored in the subsequent energy releasing process, and all the energy storing media in the high energy state can be converted into the energy storing media in the low energy state and stored by rolling.
The process of extracting and storing the energy storage medium from one storage tank 2 into another storage tank 2 can be carried out by opening or closing a first valve group 21 provided on the branch line of each storage tank 2.
Compared with the technical scheme that two sets of storage containers capable of containing all energy storage media are arranged in the prior art, the embodiment of the invention has the advantages that the N storage containers are arranged, at least one storage container is vacated for rolling storage of the energy storage media in the energy storage or release process, and the minimum total volume requirement of the storage containers can be changed from 2VmDown to VmN/(N-1), reduces the manufacturing cost of the storage container and saves floor space.
Optionally, as shown in fig. 1 and fig. 2, the number of the first valve sets 31 on the branch pipeline where each storage container 2 is located is 2, and the first valve sets are respectively disposed at two ends of the storage container 2.
As shown in fig. 3, in the present embodiment, each storage container 2 may have an energy storage medium inlet 21 and an energy storage medium outlet 22, and N storage containers 2 are connected in parallel to two ends of the energy exchanging device 1. When the energy storage medium in a certain storage container 2 needs to be extracted, the first valve group 31 at the energy storage medium outlet 22 of the storage container 2 can be opened; when it is desired to store energy storage medium in a certain storage container 2, the first valve block 31 at the energy storage medium inlet 21 of that storage container 2 can be opened.
In the embodiment, the first valve groups are respectively arranged at two ends of each storage container, so that the flow pipeline of the energy storage medium in the high energy state and the flow pipeline of the energy storage medium in the low energy state can be distinguished in the energy storage process or the energy release process, the energy storage medium can continuously flow in a specific direction, and the continuity of the energy exchange process is improved.
Of course, in some possible embodiments, only one opening for the inlet and outlet of the energy storage medium may be provided on each storage container 2, and accordingly, only one first valve group 31 may be provided on the branch pipe of each storage container 2, and N storage containers 2 are connected to the energy exchange device 1 after being arranged in parallel.
Optionally, the first valve group 31 comprises one or more valve units; the valve unit comprises one or more valves; when the first valve block 31 includes a plurality of valve units, the plurality of valve units are arranged in parallel.
The valve unit may be a check valve, a block valve, a regulating valve, etc. The purpose of arranging a plurality of valve units which are connected in parallel with each other is to activate one valve unit after the other valve unit is damaged or blocked by an energy storage medium; on the other hand, in the process of maintenance, the valve units can be maintained or used in turn, and the normal energy storage working process is not influenced. The valves may be one or more of check valves, block valves, regulating valves, etc., for example, each valve unit may be composed of a series of check valves, block valves, and regulating valves.
Optionally, a fourth valve group 34 is provided on the branch conduit of the energy exchange device 1.
The fourth valve group 34 is provided to facilitate the cutting off of the rest of the lines during the maintenance of the energy exchange device 1, and to assist the flow control by providing valves such as throttle valves.
Optionally, as shown in fig. 2, the energy exchanging device 1 includes an energy storing sub-device 11 and an energy releasing sub-device 12 arranged in parallel; a second valve group 32 is arranged on a branch pipeline where the energy storage sub-device 11 is located, and a third valve group 33 is arranged on a branch pipeline where the energy release sub-device 12 is located.
In this embodiment, the energy storage sub-device 11 and the energy release sub-device 12 are separately arranged, and the energy storage process and the energy release process are performed in different devices respectively. For example, during the energy storage process, the second valve set 32 is opened, the third valve set 33 is closed, and the energy storage medium from the storage container 2 enters the energy storage sub-device 11 to absorb external heat; during the energy release, the second valve set 32 is closed and the third valve set 33 is opened. Since the external heat source or the cold source may be the same or different objects, for example, the external heat source may be solar energy or high-temperature water vapor, etc., and the external cold source may be domestic water, etc. The energy storage sub-device 11 and the energy release sub-device 12 are arranged separately, so that the energy storage sub-device can be well adapted to various application occasions, and the application range is expanded.
In practical applications, the energy storage sub-device 11 and the energy release sub-device 12 may be combined or partially combined according to the characteristics of the energy storage system. For example, the energy exchange device 1 is a heat exchanger having two sets of independent fluid channels, wherein one set of fluid channels is used for circulating the energy storage medium, and when the other set of fluid channels is introduced into an external heat source, the heat exchanger forms the energy storage sub-device 11; when the other set of fluid channel is introduced into the external cold source, the heat exchanger forms an energy release sub-device 12. As another example, the energy exchange device 1 is a heat exchanger with three sets of independent fluid channels, the first set of fluid channels is used for circulating the energy storage medium, the second set of fluid channels is used for circulating the external heat source, and the third set of fluid channels is used for circulating the external heat source, corresponding to the configuration that the energy storage sub-device 11 and the energy release sub-device 12 are partially combined.
Optionally, the energy storage system further comprises a pump structure 4, and the pump structure 4 is mounted on the main pipeline.
The pump structure 4 can be a centrifugal pump, an axial flow pump, a positive displacement pump and other types of pumps, and is selected according to actual requirements. In terms of the number of the pump structures 4, only one pump structure 4 may be arranged at the position of the main pipeline as shown in fig. 1 and fig. 2, or a plurality of pump structures 4 may be selected to be arranged in series and/or in parallel according to actual parameters (for example, the relative height position between the energy exchange device 1 and the storage container 2, the length and the pipe diameter of the pipeline, the viscosity of the energy storage medium, and the like), so as to ensure the safe and reliable operation of the energy storage system.
In addition, since the above-mentioned pump structure 4 may be applied to the pumping of energy storage media in a high energy state and in a low energy state at the same time, the selected pump structure 4 may be adapted to the operating characteristics of energy storage media in two energy states at the same time.
Optionally, each storage container 2 is provided with an insulating layer 24 at least on the inner wall.
In a thermal energy storage system, the provision of the thermally insulating layer 24 reduces the loss of thermal energy from the storage medium in the storage vessel 2. As shown in fig. 3, the thermal insulation layer 24 is provided inside the storage container 2, so that the influence of the heat capacity of the storage container 2 on the stored energy can be reduced. Optionally, an insulating layer 24 may be provided on both the inner and outer walls of the storage container 2 to further enhance the insulating effect.
Optionally, as shown in fig. 4, the energy storage system further includes a heating device, and the heating device 5 is arranged in parallel with the energy exchange device 1.
During shutdown, maintenance and the like, the energy storage system may be left standing for a long time, which causes the temperature of the energy storage medium in the storage container 2 to drop and affects the normal flow of the energy storage medium, and the heating device 5 is arranged to heat the energy storage medium to a temperature suitable for work and operation.
Taking the energy storage medium as water for example, when the energy storage system is standing for a long time, and the ambient temperature is below the freezing point, the fifth valve bank 35 located on the branch pipeline where the heating device 5 is located can be opened, the water wheel flow in the storage container 2 is conveyed to the heating device 5 to absorb heat, so that the temperature of water is kept at about 10 ℃, and the water cannot flow due to icing when the energy storage system operates again is avoided.
Further alternatively, the function of the heating device 5 can also be performed by the energy exchange device 1.
Optionally, as shown in fig. 3, a shielding gas interface 23 is provided on each storage container 2.
For the energy storage media such as heat transfer oil and molten salt, the storage container 2 needs to have good sealing performance and avoid the energy storage media from contacting with air as much as possible in consideration of oxidation resistance or aging resistance. In this embodiment, the storage container 2 is provided with a shielding gas interface 23, and can be further connected to an external shielding gas source structure, such as an inert gas storage tank. When the energy storage medium in a certain storage container 2 is led out, inert gas continuously enters the storage container 2, the pressure in the storage container 2 is balanced, and the energy storage medium is protected; when a certain storage vessel 2 is introduced into the energy storage medium, the inert gas is returned to the inert gas tank.
In some possible embodiments, as the energy storage medium inevitably undergoes evaporation loss and aging, a structure for replacing, supplementing or purifying the energy storage medium and the like can be added into the energy storage system.
Furthermore, considering the specific volume of the energy storage medium that varies or changes with the energy state, and the meteorological conditions (e.g., local environmental temperature difference, pressure difference, etc.) at the location of the energy storage system, the volume of a single storage vessel 2 and the total volume of all storage vessels 2 should be maximized by combining the above conditions. The type of the storage container 2 can be determined by combining the characteristics of the energy storage medium, the operating parameters, the arrangement conditions, etc., fig. 3 is only a schematic diagram illustrating a possible structure of the storage container 2 according to the embodiment of the present invention, and in practical applications, the storage container 2 may also be a container in the form of, for example, a vertical storage tank, a storage tank, etc.
Optionally, the first valve block 31 is an electric valve block.
The running state of the electric valve group is electrically controllable. Taking the energy storage system shown in fig. 1 as an example, if it is required to extract the energy storage medium in one storage container 2 (for example, the first storage container on the left side) and send the energy storage medium to another storage container 2 (for example, the second storage container on the left side) after exchanging energy (which may be stored or released) in the energy exchange device 1, the following process can be implemented:
controlling the first valve group 31 at the energy storage medium outlet 22 of the first left storage container 2 to be opened, closing the other first valve groups 31, pumping the energy storage medium in the first left storage container 2 to the energy exchange device 1, after the energy storage medium finishes energy storage or energy release, controlling the first valve group 31 at the energy storage medium inlet 21 of the second left storage container 2 to be opened, and closing the other first valve groups 31 to send the energy storage medium into the second left storage container 2; the energy states of all the energy storage media can be converted by rolling operation. Of course, when the energy exchange efficiency in the energy exchange device 1 is high, the first valve group 31 at the energy storage medium outlet 22 of the first left storage container 2 and the first valve group 31 at the energy storage medium inlet 21 of the second left storage container 2 may be opened simultaneously, and the other first valve groups 31 may be closed, so as to improve the continuity of the energy exchange process.
The first valve bank is set as the electric valve bank in the embodiment, and a hardware basis is provided for realizing automatic operation of the energy storage system. In addition, how to realize the electric control of the electric valve group belongs to the prior conventional technology, and the details are not repeated herein.
As a further alternative, for the energy storage system shown in fig. 2, the second valve set 32 and the third valve set 33 may be electric valve sets, and the working process is similar to the above process, and only the second valve set 32 needs to be opened and the third valve set 33 needs to be closed during the energy storage process; during the energy release, the second valve set 32 is closed and the third valve set 33 is opened.
According to the energy storage system provided by the embodiment of the invention, in the process of storing or releasing energy, at least one storage container is vacated for rolling storage of the energy storage medium, so that the minimum total volume requirement of the storage container can be changed from 2VmDown to VmN/(N-1), the manufacturing cost of the storage container is reduced, the floor space is saved, and the economy of the energy storage system is improved.
The embodiment of the invention also provides an energy storage method, which is applied to the energy storage system and comprises the following steps:
the method comprises the steps that a first energy state energy storage medium in a first storage container is conveyed to an energy exchange device, and a second energy state energy storage medium obtained through conversion of the energy exchange device is conveyed to a second storage container;
after the first energy state energy storage medium in the first storage container is conveyed, conveying the first energy state energy storage medium in a third storage container to the energy exchange device, and conveying a second energy state energy storage medium obtained by conversion through the energy exchange device to the first storage container;
the first storage container and the third storage container are both storage containers in which energy storage media in a first energy state are stored in the N storage containers, the second storage container is a storage container in which any one of the N storage containers is in an empty state, and the energy storage media in the first energy state and the energy storage media in the second energy state are energy storage media in different energy states.
It is noted that the terms "first," "second," "third," and the like, herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. For example, for a storage medium, if the first energy state is a high energy state, the second energy state is a low energy state; conversely, if the first energy state is a low energy state, the second energy state is a high energy state. For another example, the number N of the storage containers may be any positive integer greater than 2, and when N is 3, the steps of the energy storage method may be a complete working process; and when N >3, the step of the energy storage method can be one of a plurality of circulation processes in the complete working process.
It should be noted that the energy storage method provided by the embodiment of the present invention is a method applied to the energy storage system, so that all embodiments of the energy storage system are applicable to the energy storage method and can achieve the same or similar beneficial effects.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims (10)
1. An energy storage system, comprising: the energy storage device comprises an energy exchange device and N storage containers, wherein the N storage containers can be used for storing energy storage media in different energy states;
the volume of each storage container is greater than or equal to Vm/(N-1)，VmN is a positive integer greater than 2 and is the total volume of the energy storage medium;
the N storage containers are arranged in parallel and connected to the energy exchange device through a main pipeline;
and a first valve bank is arranged on each branch pipeline where the storage container is located.
2. The energy storage system of claim 1, wherein the number of the first valve sets on the branch pipes of each storage container is 2, and the first valve sets are respectively disposed at two ends of the storage container.
3. The energy storage system of claim 1 or 2, wherein the first valve bank comprises one or more valve units; the valve unit comprises one or more valves;
when the first valve block includes a plurality of valve units, the plurality of valve units are arranged in parallel.
4. The energy storage system of claim 1, wherein the energy exchanging device comprises an energy storage sub-device and an energy release sub-device arranged in parallel;
and a second valve bank is arranged on the branch pipeline where the energy storage sub-device is located, and a third valve bank is arranged on the branch pipeline where the energy release sub-device is located.
5. The energy storage system of claim 1, further comprising a pump structure mounted on the main line pipe.
6. The energy storage system of claim 1, wherein each of the storage containers is provided with an insulating layer on at least an inner wall.
7. The energy storage system of claim 1, further comprising a heating device disposed in parallel with the energy exchange device.
8. The energy storage system of claim 1, wherein a shielding gas port is provided on each of the storage containers.
9. The energy storage system of claim 1, wherein the first valve bank is an electric valve bank.
10. An energy storage method applied to the energy storage system according to any one of claims 1 to 9, comprising:
the method comprises the steps that a first energy state energy storage medium in a first storage container is conveyed to an energy exchange device, and a second energy state energy storage medium obtained through conversion of the energy exchange device is conveyed to a second storage container;
after the first energy state energy storage medium in the first storage container is conveyed, conveying the first energy state energy storage medium in a third storage container to the energy exchange device, and conveying a second energy state energy storage medium obtained by conversion through the energy exchange device to the first storage container;
the first storage container and the third storage container are both storage containers in which energy storage media in a first energy state are stored in the N storage containers, the second storage container is a storage container in which any one of the N storage containers is in an empty state, and the energy storage media in the first energy state and the energy storage media in the second energy state are energy storage media in different energy states.
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