CN210723236U

CN210723236U - Flow battery modularization unit and flow energy storage system

Info

Publication number: CN210723236U
Application number: CN201922204867.XU
Authority: CN
Inventors: 黄涛; 余龙海; 史小虎; 熊建新; 姜鹏
Original assignee: Hunan Fangu New Energy Technology Co ltd
Current assignee: Hunan Fangu New Energy Technology Co ltd
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-06-09
Anticipated expiration: 2029-12-10

Abstract

The utility model relates to a flow battery unit and system, the utility model discloses the first aspect provides a flow battery modularization unit, including galvanic pile module, transport module and monitoring subassembly, wherein: the conveying assembly comprises a positive electrode pump, a negative electrode pump, a valve and a pipe fitting required for connecting to the outside; the monitoring assembly includes: the pressure sensor (4) is used for detecting the pressure of the liquid inlet of the galvanic pile; and the monitoring device (5) is used for monitoring/displaying the pressure, the temperature and the voltage of the stack module. The utility model discloses the second aspect relates to the flow battery system of application this modularization unit. The module unit can be used independently, can also be used as a modular standard unit required by large-scale system integration, and has the advantages of high integration level, small occupied area, simplicity and convenience in maintenance, quickness in installation and debugging, easiness in control and management and the like.

Description

Flow battery modularization unit and flow energy storage system

Technical Field

The utility model relates to a liquid stream energy storage system, more specifically relate to full vanadium liquid stream energy storage system.

Background

The development and utilization of renewable energy sources are increasingly emphasized, and the application is more and more extensive. However, the method has the characteristics of randomness, volatility, uncontrollable regulation and the like, and the fluctuation of the voltage and the frequency of the power generation network is caused after the power generation network is accessed, so that the safe and stable operation of the power generation network is influenced. The all-vanadium redox flow energy storage battery system comprises a galvanic pile unit, electrolyte, an electrolyte storage unit, a pipeline conveying system, a BMS (battery management system) and the like. The wind-solar hybrid power generation system has the characteristics of high capacity, flexible capacity configuration, long cycle life, safety, environmental protection and the like, and is widely applied to the fields of wind-solar hybrid, peak clipping and valley filling, intelligent micro-grids, emergency power supplies and the like. By introducing the all-vanadium liquid flow energy storage system, the operation stability of a power system can be effectively improved, the frequency can be adjusted, the load fluctuation can be compensated, the power utilization cost can be reduced, the utilization rate of power equipment can be improved, and the grid connection and the use of renewable energy sources can be promoted.

The existing large-scale liquid flow energy storage system such as a megawatt-level energy storage system is integrated by electric piles, a main pipe subdivides branch pipes, and the branch pipes are connected with a plurality of electric piles, the pipeline connection is generally complex, and the field installation is time-consuming. Moreover, when one of the sub-electric piles is in fault, the whole system needs to be stopped, and the workload is larger when the fault unit is updated.

Secondly, the existing multi-pile liquid flow energy storage system is generally provided with a positive electrolyte storage tank and a negative electrolyte storage tank which are respectively matched with a delivery pump, the power of the pumps is very high, the design of the pipeline is that 2n type structures which start from a main pipe to divide into two, divide into four and divide into eight are adopted to be connected to liquid inlet and outlet ports of the piles in a stepwise branching mode, the pipe distribution mode hardly ensures the pressure balance of the inlet and outlet ports of each pile, the voltage of each pile is inconsistent, and the piles are enabled to discharge automatically.

The Chinese patent application CN201720236031 adopts a bypass pipeline connected in parallel in a circulating pipeline of an all-vanadium liquid flow energy storage power station and adds a flow control valve to achieve the aims of balancing the flow, balancing the voltage of a plurality of series-connected galvanic piles and reducing self-discharge. However, for a large energy storage system with a large number of galvanic piles, a large number of bypass pipelines are added, and the occupied area of the system is larger. One pump is respectively arranged on the anode and the cathode, and if the pump fails, the whole system cannot operate. The disadvantage of adopting the pipe distribution mode is that the occupied area is large, the cost is high, the time consumption of field pipe connection is high, and when a fault occurs, the maintenance is very troublesome, and the pipe distribution mode is not suitable for modularization and batch production.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the utility model is to solve the problem that the work load of replacing and maintaining a single galvanic pile of the current flow battery system is large and the work of the whole system is influenced.

According to the utility model discloses a flow battery modularization unit, including galvanic pile module, transport component and monitoring subassembly, wherein: the conveying assembly comprises a positive electrode pump, a negative electrode pump, a valve and a pipe fitting required for connecting to the outside; the monitoring assembly includes: the pressure sensor is used for detecting the pressure of the liquid inlet of the galvanic pile; and the monitoring device is used for monitoring/displaying the pressure, the flow and the voltage of the stack module.

In one embodiment, each of the pile modules is composed of two sub-piles, and each modular unit is provided with four pumps which are respectively used as a positive electrode pump and a negative electrode pump of the two sub-piles.

In one embodiment, the monitoring device can display the pressure, the flow rate and the voltage of the two sub-electric piles at the same time.

In a specific embodiment, the flow battery modular unit further comprises one or more of a base, a housing, a leak protection device, and a heat sink.

In one embodiment, the pipe fitting comprises a liquid inlet and outlet branch pipe assembly, the modular unit is connected with a liquid inlet and outlet main pipe of the liquid flow energy storage system, and the liquid inlet and outlet branch pipe assembly comprises a loose joint, a tee joint, a plug and a straight pipe.

The utility model discloses the second aspect still provides a liquid stream energy storage system, including an anodal liquid storage pot, a negative pole liquid storage pot and an electricity heap frame, including above-mentioned redox flow battery modularization unit.

The utility model provides a scheme is integrated as a modularization standard unit with galvanic pile, galvanic pile base, pump, galvanic pile monitoring devices, attached pipeline, and this modular unit both can the exclusive use, also can regard as the required modularization standard unit of scale system integration, and this unit has advantages such as the integrated level is high, take up an area of for a short time, maintain portably, installation and debugging are swift, easily control the management.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive laboriousness.

Fig. 1 is an isometric view of a flow battery modular unit according to the present invention;

FIG. 2 is an isometric view of a stack frame with a main pipe for liquid inlet and outlet;

FIGS. 3a and 3b are isometric views of an inlet manifold assembly and an outlet manifold assembly, respectively, according to an exemplary embodiment;

fig. 4 is an energy storage system assembly diagram according to the present invention.

The device comprises a unit 1a, a galvanic pile modular unit, a galvanic pile module (or called galvanic pile), a pump 2, a liquid inlet branch pipe assembly 2a, a unit base 3, a liquid outlet branch pipe assembly 3a, a pressure sensor 4, a monitoring device 5, a positive liquid inlet main pipe 6, a negative liquid inlet main pipe 7, a positive liquid outlet main pipe 8, a negative liquid outlet main pipe 9, a galvanic pile frame 10 and a cable bridge frame 11.

Detailed Description

The invention will be further described with reference to specific embodiments, wherein the drawings are designed solely for the purpose of illustration and not as a definition of the limits of the patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

As shown in fig. 1, the flow battery modular unit 1a according to the present invention comprises: galvanic pile 1, transport module and monitoring subassembly, wherein: the conveying assembly comprises a positive pump and a negative pump for providing circulating power for the electrolyte, a valve for controlling the connection/disconnection of the external pipeline and a pipe fitting for realizing the communication with the external pipeline; the monitoring assembly comprises a pressure sensor 4 for detecting the liquid inlet pressure of the galvanic pile and a monitoring device 5 for monitoring/displaying the pressure, the temperature and the voltage of the galvanic pile module.

The utility model discloses in, positive, negative of every unit all is equipped with a pump, can be alternating current pump or direct current pump, and the preferred direct current pump that uses, direct current have advantages such as the consumption is little, small, low noise, security are high, longe-lived. The power of the pump is selected according to the specification of the stack unit, and is generally between 200W and 550W. Providing separate pumps for each module has the advantage that, firstly, one or a part of the modular units can be switched on and off while the system is on-line, without causing pressure fluctuations in the other units. Secondly, the installation and the disassembly are very convenient. Moreover, under the condition that all the module units can work normally, the number of the module units in the working state can be adjusted according to the generated electric quantity, for example, when the electric quantity is large, full load is adopted, and when the electric quantity is small, a part of the module units are turned off. In a preferred embodiment, each modular unit is electrically and communicatively connected to the overall control device of the battery system, so that the pump operation of each unit can be controlled by the overall control device. Likewise, the monitoring device is also electrically and communicatively connected to the overall control device, so that the parameter information of the individual modules can be read in the overall control device. Therefore, one wiring harness port is provided for each module unit, and the wiring harness port of the system are plugged when the system is assembled.

The utility model discloses a preferred assembly base of modular unit, the structure of base on the one hand will be with the structure phase-match of following electricity heap frame for the unit after the installation is firm, easy installation. The base is preferably provided with a structure suitable for carrying the fork rod of a forklift. The modular unit may also have a housing to protect the modular unit stack, and the detection device in the unit may be designed outside the housing or read information displayed by the detection device when the housing is installed.

In addition, it is generally necessary to provide each cell with a leak-proof device, which is usually made of a corrosion-resistant material, such as stainless steel, or a material with a special coating, since the electrolyte is inevitably leaked during handling or long-term use of the cell. The leakage-proof device can be a separate liquid receiving disc which is placed on the base and can also be fixed on the base through a connecting piece. One preferred solution is to integrate the leakage preventing means with the base.

In a specific embodiment, when the module units are assembled into a flow battery system, the electric pile 1 is fixed on the electric pile base 3, the pump 2 is fixed on the electric pile base 3, a pressure sensor 4 is arranged on a pipeline between the rear end of a liquid outlet flange of the pump 2 and a liquid inlet of the electric pile for monitoring the pressure of the liquid inlet of the electric pile, and a monitoring device 5 is arranged in front of the electric pile; and then, each liquid inlet and outlet pipeline of the galvanic pile is manufactured to form an assembly 1a in the energy storage system, the assembly 1a can be used as the minimum modular standard unit of the large-scale energy storage system for batch production, and the modular standard unit has the advantages of high integration, quick installation, online monitoring, convenient replacement and the like.

As shown in fig. 2, a suitable size of a pile frame 10 is prepared in advance, and a positive liquid inlet main pipe 6, a negative liquid inlet main pipe 7, a positive liquid outlet main pipe 8, a negative liquid outlet main pipe 9, and a cable bridge 11 are fixed on the pile frame 10. These main pipes communicate to each modular unit through inlet and outlet

riser pipe assemblies

2a and 3a as shown in figures 3a and 3 b. The

assemblies

2a and 3a are composed of a loose joint 201, a reducing tee 202, a choke 203 and a hard pipe 204, and the components are preferably made of PVC and can also be made of engineering plastics, metals or alloys. When the system is assembled, the plurality of assemblies 1a are installed on the electric pile frame 10, the liquid inlet vertical pipe branch pipe assembly 2a and the liquid outlet vertical pipe branch pipe assembly 3a are respectively connected with the pipeline interfaces of the assemblies 1a, the anode liquid inlet main pipe 6, the cathode liquid inlet main pipe 7, the anode liquid outlet main pipe 8 and the cathode liquid outlet main pipe 9 (the interfaces can be connected through loose joints or corrosion-resistant hoses), and the installation of main conveying pipelines of the system is completed. The pipe distribution mode has the advantages that most of pipelines can be manufactured in advance, the installation of the liquid inlet and outlet main pipes, the assembly 1a, the assembly 2a and the assembly 3a can be synchronously manufactured, only field splicing is needed, and the installation efficiency is greatly improved.

FIG. 4 is an assembled view of the energy storage system after installation; in the embodiment of the scheme, 12 21.5kw galvanic piles are taken as an example, the galvanic piles are arranged according to an upper layer and a lower layer, 6 galvanic piles are arranged on each layer, wherein the two galvanic piles on the upper layer and the lower layer are connected in series through a pipeline, and the galvanic piles in the horizontal direction are connected in parallel through a pipeline; the

main pipes

6, 7, 8 and 9 of the positive and negative electrodes are fixed on the electric pile frame 10, the liquid inlet and outlet main pipes are connected with the upper inlet flange and the outlet flange of the storage tank 103, then the electric pile assembly 1a is sequentially fixed on the electric pile frame 10 in a forking manner, the positions are adjusted, finally the liquid inlet vertical pipe branch pipe 2a and the liquid outlet vertical pipe branch pipe 3a are connected with the pipe interfaces on the

main pipes

6, 7, 8 and 9 and the electric pile assembly 1a, and the installation of the electrolyte conveying pipeline unit of the energy storage system is completed. When a certain galvanic pile component 1a in the system breaks down and needs to be replaced, only the valve in the component 1a needs to be closed, a small amount of electrolyte in the pipelines of the

branch pipe components

2a and 3a is discharged, a new galvanic pile is replaced, and the

branch pipes

2a and 3a are connected with the galvanic pile component 1a and the reserved interfaces of the liquid inlet and outlet main pipes.

The utility model discloses a modularization liquid flow energy storage system provides a thinking for standardization, scale production, integrated control and convenient installation, the maintenance of large-scale energy storage power station, has improved the installation effectiveness of system, reduces because of single galvanic pile or module trouble lead to the whole risk that can't move of system, and the operation maintenance in the while for the system later stage facilitates.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The technical idea of the utility model within the scope, can be right the utility model discloses a technical scheme carries out multiple simple variant, makes up with any suitable mode including each concrete technical feature. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims

1. A flow battery modular unit, characterized by comprising a stack module (1), a delivery assembly and a monitoring assembly, wherein:

the conveying assembly comprises a positive electrode pump, a negative electrode pump, a valve and a pipe fitting required for connecting to the outside;

the monitoring assembly includes: the pressure sensor (4) is used for detecting the pressure of the liquid inlet of the galvanic pile; and the monitoring device (5) is used for monitoring and/or displaying the pressure, the temperature and the voltage of the electric pile module (1).

2. The flow battery modular unit of claim 1, wherein each of the stack modules is comprised of two sub-stacks, and each modular unit is provided with four pumps, respectively serving as a positive pump and a negative pump for the two sub-stacks.

3. The flow battery modular unit according to claim 2, wherein the monitoring device (5) can display the pressure, temperature and voltage of two sub-stacks simultaneously.

4. The flow battery modular unit of claim 1, further comprising one or more of a base, a housing, a leak protection device, and a heat sink.

5. The flow battery modular unit of claim 1, the tubing comprising a branch inlet and outlet assembly (2a, 3a) connecting the modular unit with a main inlet and outlet pipe (6, 7, 8, 9) of the flow energy storage system, the branch inlet and outlet assembly consisting of a loose joint (201), a tee (202), a plug (203) and a straight pipe (204).

6. A flow energy storage system comprising a positive pole liquid storage tank, a negative pole liquid storage tank and an electric pile frame (10), characterized by comprising the flow battery modular unit of any one of claims 1-5.

7. The liquid flow energy storage system of claim 6, wherein the electric pile frame is divided into two layers, wherein the two electric piles in the upper layer and the lower layer are connected in series through a pipeline, and the electric piles in the horizontal direction are connected in parallel through a pipeline.