CN214154157U - Energy storage system with mixed flow battery and lithium battery - Google Patents
Energy storage system with mixed flow battery and lithium battery Download PDFInfo
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- CN214154157U CN214154157U CN202120047714.3U CN202120047714U CN214154157U CN 214154157 U CN214154157 U CN 214154157U CN 202120047714 U CN202120047714 U CN 202120047714U CN 214154157 U CN214154157 U CN 214154157U
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Abstract
The utility model discloses an energy storage system that flow battery and lithium cell mix belongs to energy storage technical field. The system comprises a DC-AC module, a hybrid battery management system, a DC-DC module, a lithium battery module and a flow battery module. Each lithium battery module and each redox flow battery module are respectively and correspondingly connected with one DC-DC module, all the DC-DC modules are connected in parallel and then connected with a hybrid battery management system, the hybrid battery management system is connected with the DC-AC module, and the DC-AC module is connected with an external power grid. The utility model discloses can the fast big multiplying power of full play lithium ion battery discharge and the great advantage of the long circulation performance of redox flow battery, security and depth of discharge, the advantage is complementary between the two, improves energy storage system's security and charge-discharge performance.
Description
Technical Field
The utility model belongs to the technical field of the energy storage, concretely relates to energy storage system and working method that flow battery and lithium cell mix.
Background
The lithium ion battery is the chemical energy storage battery which has the largest installed scale and the most extensive application in China at present. The lithium ion battery is an energy storage device which realizes energy conversion mainly by the way that lithium ions are de-intercalated between a positive electrode and a negative electrode through electrolyte. Lithium ion batteries are currently used in the fields of electric vehicles, power grid frequency control, system standby, system stability, new energy access and the like. The current battery energy storage technology generally adopts the mode that the battery packs are connected in series and then connected in parallel, has high requirement on the consistency of the battery, and can influence the operation of the whole battery cluster when a battery core fault occurs in one battery module. Especially for a large-capacity energy storage system, the consistency problem is particularly outstanding, and one cell fault can cause the great decline of the capacity of the whole power station. In addition, if several batteries in one series-connected battery cluster have faults, the voltage of the whole group is insufficient, other batteries can be charged all the time, normal battery overcharge is caused, safety accidents occur, and the circuit is on fire.
The redox flow battery is mainly characterized in that active materials are arranged in positive and negative electrolyte tanks, and the conversion between electric energy and chemical energy is realized by oxidation-reduction reaction on positive and negative interfaces. The flow battery is mainly applied to the fields of standby power supplies, electric automobiles, large-scale energy storage and the like at present. The flow battery has the main advantages of flexible power and capacity configuration, long battery cycle life (10000 times), low battery self-discharge rate, safety, stability, deep discharge capacity (up to 100%), large capacity, capability of being used as a large-capacity electrochemical energy storage system, and the defects of low discharge rate and low energy efficiency of battery operation.
Disclosure of Invention
In order to solve the existing problem, the utility model aims to provide an energy storage system that redox flow battery and lithium cell mix can the fast big multiplying power of full play lithium ion battery discharge and the great advantage of the long cycle performance of redox flow battery, security and depth of discharge, and the advantage is complementary between the two, improves energy storage system's security and charge-discharge performance.
The utility model discloses a following technical scheme realizes:
the utility model discloses an energy storage system with a flow battery and a lithium battery, which comprises a DC-AC module, a hybrid battery management system, a DC-DC module, a lithium battery module and a flow battery module;
each lithium battery module and each redox flow battery module are respectively and correspondingly connected with one DC-DC module, all the DC-DC modules are connected in parallel and then connected with a hybrid battery management system, the hybrid battery management system is connected with the DC-AC module, and the DC-AC module is connected with an external power grid.
Preferably, a BMS module is connected to each DC-DC module, and all the BMS modules are respectively connected to the hybrid battery management system.
Preferably, the lithium battery module is formed by connecting a plurality of lithium ion battery cells in series or in parallel.
Further preferably, the lithium ion battery cell is a lithium cobalt oxide battery, a lithium manganate battery, a lithium iron phosphate battery or a ternary lithium battery.
Preferably, the flow battery module is formed by connecting a plurality of flow battery cells in series or in parallel.
Preferably, the flow battery cell is an all-vanadium flow battery, a zinc-bromine flow battery, an iron-chromium flow battery, a sodium polysulfide/bromine battery or an organic flow battery.
Preferably, the lithium battery module is a rate type output energy storage unit, and the flow battery module is an energy type output energy storage unit.
Preferably, a fast cut-off switch is connected to each DC-DC module.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses an energy storage system that redox flow battery and lithium cell mix, because the lithium cell overcharge put or appear when the relatively poor condition of uniformity, easily appear burning explosion even, and redox flow battery charge-discharge depth can reach 100%, and can prepare large capacity battery, and the operating temperature broad is-30 ~ 50 ℃, and the security is higher, combines together both can effectively improve the security of energy storage system at the operation in-process. The lithium battery can carry out high-rate discharge, the flow battery has the advantage of large-capacity storage, the two batteries can respond to the demand of instantaneous peak-load and frequency-modulation of the power grid, the requirement of long-time peak load shifting can be realized, and the power grid is stabilized comprehensively. The flow battery has long cycle life, and the lithium ion battery can fully exert the advantages of a multiplying power battery and prolong the cycle service life of the energy storage system. The energy storage system controls the charging and discharging of the flow battery and the lithium ion battery through the independent DC-DC modules, the operation efficiency of the system can be improved, the expansion is convenient, and meanwhile, the energy storage system has the characteristic of easiness in maintenance.
Furthermore, each DC-DC module is connected with a BMS module, various data of the flow battery and the lithium battery can be collected in real time, the hybrid battery management system can allocate and manage the whole system in time according to the data, and the comprehensive efficiency and the stability of the system are improved.
Furthermore, the lithium battery module can quickly respond to the instruction, and the high-capacity energy storage is prone to failure, so that the lithium battery module is used as a multiplying power type output energy storage unit in the system; the flow battery has flexible capacity configuration, long battery cycle life, safety and stability, and deep discharge capacity, but the discharge rate is low, so the flow battery is used as an energy type output energy storage unit in a system.
Furthermore, each DC-DC module is connected with a quick cut-off switch, and can be independently withdrawn when a fault occurs, so that the operation of other battery modules is not influenced.
Drawings
Fig. 1 is an overall structural schematic diagram of an energy storage system with a hybrid flow battery and a lithium battery according to the present invention.
In the figure: the system comprises a DC-AC module 1, a hybrid battery management system 2, a DC-DC module 3, a lithium battery module 4 and a flow battery module 5.
Detailed Description
The invention will be described in further detail with reference to the following drawings and specific examples, which are intended to illustrate and not to limit the invention:
referring to fig. 1, the present invention relates to an energy storage system with a flow battery and a lithium battery, which comprises a DC-AC module 1, a hybrid battery management system 2, a DC-DC module 3, a lithium battery module 4 and a flow battery module 5.
Each lithium battery module 4 and each redox flow battery module 5 are respectively and correspondingly connected with one DC-DC module 3, all the DC-DC modules 3 are connected with the hybrid battery management system 2 after being connected in parallel, the hybrid battery management system 2 is connected with the DC-AC module 1, and the DC-AC module 1 is connected with an external power grid.
In a preferred embodiment of the present invention, each DC-DC module 3 is connected to a BMS module, and all BMS modules are connected to the hybrid battery management system 2, respectively.
In a preferred embodiment of the invention, each DC-DC module 3 is connected with a fast cut-off switch.
The lithium battery module 4 is formed by connecting a plurality of lithium ion battery monomers in series or in parallel. The lithium ion battery monomer can be a lithium cobalt oxide battery, a lithium manganate battery, a lithium iron phosphate battery or a ternary lithium battery.
The flow battery module 5 is formed by connecting a plurality of flow battery monomers in series or in parallel. The flow battery monomer can be an all-vanadium flow battery, a zinc-bromine flow battery, an iron-chromium flow battery, a sodium polysulfide/bromine battery or an organic flow battery.
The lithium battery module 4 is a multiplying power type output energy storage unit, and the flow battery module 5 is an energy type output energy storage unit. For example, a 2MW/1MWh lithium battery energy storage system and a 1MW/4MWh flow battery energy storage system are configured. The lithium ion battery adopts a lithium iron phosphate battery, and the flow battery adopts an all-vanadium flow battery. In the lithium iron phosphate battery system, every 125kWh is a module which is respectively connected with the DC-DC module 3 in series, in the all-alum liquid flow battery system, every 500kWh is a module which is respectively connected with the DC-DC module 3 in series, after the voltage is boosted by the DC-DC module 3, the lithium iron phosphate battery system and the all-alum liquid flow battery system are uniformly output and connected with the hybrid battery energy storage system, and finally, the lithium iron phosphate battery system and the all-alum liquid flow battery system are subjected to alternating current conversion through the DC-AC module and are connected with an external power grid.
The working method of the energy storage system with the flow battery and the lithium battery mixed comprises the following steps:
the hybrid battery management system 2 acquires the operation parameters of the lithium battery module 4 and the flow battery module 5 in real time, analyzes the residual capacity of the lithium battery in the lithium battery module 4 and the residual capacity of the flow battery in the flow battery module 5 through the voltage and the current of the lithium battery module 4 and the flow battery module 5, then allocates through the DC-DC modules 3 corresponding to the lithium battery module 4 and the flow battery module 5 respectively, and charges and discharges an external power grid through the DC-AC module 1; the high-current charging and discharging instruction is completed by the lithium battery module 4 preferentially, the low-current charging and discharging instruction is completed by the flow battery module 5 preferentially, and when a single battery module cannot complete the charging and discharging instruction, the lithium battery module 4 and the flow battery module 5 complete the charging and discharging instruction simultaneously. Generally, the command for a large current of 1 to 20C is a large current command, and the command for a small current of 0 to 1C is a small current command.
For example, if the grid command requires a short-time frequency modulation and peak shaving discharge at 2C, the hybrid battery management system 2 commands a lithium iron phosphate battery with a higher capacity to discharge, and if the grid command requires a long-time peak clipping and valley filling discharge at 0.25C, the hybrid battery management system 2 commands an all-alum flow battery with a higher capacity to discharge. When the single energy storage form can not meet the charging and discharging instruction, the lithium iron phosphate battery and the all-vanadium flow battery are charged and discharged simultaneously.
The utility model discloses a flow battery and lithium cell hybrid energy storage system's operating method, can the fast big multiplying power of full play lithium ion battery discharge and the great advantage of the long cycle performance of flow battery, security height and depth of discharge, the advantage is complementary between the two, improves energy storage system's security and charge-discharge performance. The lithium battery module can quickly respond to the instruction and discharge at a high rate, the capacity of the flow battery module is flexibly configured, and the discharge rate of the flow battery module is low, so that a high-current charging and discharging instruction is completed by the lithium battery module preferentially, and a low-current charging and discharging instruction is completed by the flow battery module preferentially.
The data of the lithium battery module 4 and the flow battery module 5 are transmitted to the hybrid battery management system 2 in real time, and the hybrid battery management system 2 independently controls the lithium battery module 4 and the flow battery module 5 in real time, so that the lithium battery module 4 and the flow battery module 5 are not influenced by each other, and the management and the scheduling of the management system are facilitated. The management system can perform operation basic information monitoring, electric quantity detection, system fault detection and maintenance, electric strategy control inside and outside the system, data communication and the like on the lithium battery module 4 and the flow battery module 5. The lithium battery module 4 and the flow battery module 5 are subjected to modular management, and can be independently withdrawn when a fault occurs, the operation of other battery modules is not influenced, and the expansion can also be directly carried out to be connected into the lithium battery module 4 or the flow battery module 5.
In the embodiments provided in the present application, the technical content disclosed herein is mainly directed to an energy storage system in which a flow battery and a lithium battery are mixed, and the above is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed herein, or changes of equivalent structures or equivalent processes performed by the contents of the specification and the drawings of the present invention, or directly or indirectly applied to other related technical fields, should be covered within the scope of the present invention.
Claims (8)
1. An energy storage system with a hybrid flow battery and a lithium battery is characterized by comprising a DC-AC module (1), a hybrid battery management system (2), a DC-DC module (3), a lithium battery module (4) and a flow battery module (5);
each lithium battery module (4) and each redox flow battery module (5) are respectively and correspondingly connected with one DC-DC module (3), all the DC-DC modules (3) are connected in parallel and then are connected with a hybrid battery management system (2), the hybrid battery management system (2) is connected with a DC-AC module (1), and the DC-AC module (1) is connected with an external power grid.
2. The hybrid energy storage system of flow batteries and lithium batteries according to claim 1, characterized in that a BMS module is connected to each DC-DC module (3), all BMS modules being connected to the hybrid battery management system (2), respectively.
3. The hybrid energy storage system of a flow battery and a lithium battery as claimed in claim 1, wherein the lithium battery module (4) is composed of a plurality of lithium ion battery cells connected in series or in parallel.
4. The hybrid energy storage system of a flow battery and a lithium battery as claimed in claim 3, wherein the lithium ion battery cell is a lithium cobalt oxide battery, a lithium manganate battery, a lithium iron phosphate battery or a ternary lithium battery.
5. The hybrid flow battery and lithium battery energy storage system according to claim 1, wherein the flow battery module (5) is composed of a plurality of flow battery cells connected in series or in parallel.
6. The hybrid flow battery and lithium battery energy storage system of claim 1, wherein the flow battery cell is an all-vanadium flow battery, a zinc-bromine flow battery, an iron-chromium flow battery, a sodium polysulfide/bromine battery, or an organic flow battery.
7. The hybrid energy storage system of a flow battery and a lithium battery as claimed in claim 1, wherein the lithium battery module (4) is a rate type output energy storage unit, and the flow battery module (5) is an energy type output energy storage unit.
8. The hybrid flow battery and lithium battery energy storage system according to claim 1, wherein a quick disconnect switch is connected to each DC-DC module (3).
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| CN202120047714.3U CN214154157U (en) | 2021-01-08 | 2021-01-08 | Energy storage system with mixed flow battery and lithium battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737130A (en) * | 2021-01-08 | 2021-04-30 | 华能陇东能源有限责任公司 | Energy storage system with mixed flow battery and lithium battery and working method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737130A (en) * | 2021-01-08 | 2021-04-30 | 华能陇东能源有限责任公司 | Energy storage system with mixed flow battery and lithium battery and working method thereof |
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