CN217655916U - Electrolyte rebalancing device of iron-chromium flow battery energy storage system - Google Patents

Electrolyte rebalancing device of iron-chromium flow battery energy storage system Download PDF

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CN217655916U
CN217655916U CN202222486099.3U CN202222486099U CN217655916U CN 217655916 U CN217655916 U CN 217655916U CN 202222486099 U CN202222486099 U CN 202222486099U CN 217655916 U CN217655916 U CN 217655916U
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electrolyte
rebalance
plc
electrolyte tank
negative
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朱文龙
王屾
何霆
曾建华
杨子骥
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Zhonghai Energy Storage Technology Beijing Co Ltd
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Zhonghai Energy Storage Technology Beijing Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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Abstract

The utility model provides an iron chromium redox flow battery energy storage system electrolyte rebalance device, including the work galvanic pile, againThe system comprises a balance battery pack, an open-circuit voltage measuring battery, a programmable charging power supply and a PLC (programmable logic controller); the working electric pile is connected with a positive electrolyte tank and a negative electrolyte tank, and the negative electrolyte tank is connected with the rebalance battery pack through a pipeline; the rebalance battery pack is connected with a rebalance electrolyte tank; the programmable charging power supply is connected with the electrode of the rebalance battery pack; the PLC is connected with the programmable charging power supply. The utility model discloses a PLC is as main control unit, through the degree of the work galvanic pile capacity decay that detects, starts the charging power supply able to programme and carries out the charging process and then reach the unnecessary Fe of electrolysis reduction cathode electrolyte to rebalance group battery 3+ And the rebalancing of the valence states of various ions in the electrolytes of the anode and the cathode of the energy storage system is completed.

Description

Electrolyte rebalancing device of iron-chromium flow battery energy storage system
Technical Field
The utility model belongs to the technical field of the energy storage, concretely relates to rebalance device of flow cell.
Background
The iron-chromium flow battery has the basic structure that a positive electrode cavity and a negative electrode cavity are separated by an ion selective permeable membrane, and positive electrolyte and negative electrolyte respectively flow in the positive electrode cavity and the negative electrode cavity. The redox couples in the positive and negative electrolytes are respectively Fe 2+ /Fe 3+ And Cr 2+ /Cr 3+ . Compared with the current common energy storage technical products such as lithium iron phosphate batteries and ternary lithium batteries, the flow battery stores liquid electrolyte outside, and the energy storage medium is aqueous solution, so that the flow battery has the advantages of high safety, long cycle life, high life cycle cost performance and the like.
In the working process of the working electric pile of the iron-chromium flow battery energy storage system, fe in the anode and cathode electrolyte tanks of the system can be caused by factors such as diaphragm permeation, side reaction, environmental temperature fluctuation and the like 3+ And Cr 2+ The valence state of the battery is unbalanced, and the capacity of the battery is reduced, so that the stable and reliable operation of the energy storage system is influenced.
Disclosure of Invention
To the weak point that prior art exists, the utility model aims at providing a ferro-chromium redox flow battery energy storage system electrolyte rebalancing device carries out rebalancing operation when the capacity of battery takes place to descend.
Realize the utility model discloses the technical scheme of above-mentioned purpose does:
an electrolyte rebalancing device of an iron-chromium flow battery energy storage system comprises a rebalancing battery pack, an open-circuit voltage measuring battery (OCV battery), a programmable charging power supply and a PLC;
the working electric pile is connected with a positive electrode electrolyte tank and a negative electrode electrolyte tank, and the negative electrode electrolyte tank is connected with the rebalance battery pack through a rebalance electrolyte pipeline; the rebalance electrolyte pipeline is provided with a cathode pump and an anode pump which are respectively controlled by a cathode frequency converter and an anode frequency converter, and the cathode frequency converter and the anode frequency converter are connected with the PLC; the rebalance battery pack is connected with a rebalance electrolyte tank; the programmable charging power supply is connected with the electrode of the rebalance battery pack; the PLC is connected with the programmable charging power supply.
The working electric pile is respectively connected with the anode electrolyte tank and the cathode electrolyte tank through an anode liquid flow pipeline and a cathode liquid flow pipeline, the anode electrolyte tank and the cathode electrolyte tank are connected with the open-circuit voltage measuring battery through pipelines, and the open-circuit voltage measuring battery is in communication connection with the PLC; the PLC is connected with a positive frequency converter and a negative frequency converter, the positive frequency converter is connected to the positive circulating pump, and the negative frequency converter is connected to the negative circulating pump.
Furthermore, a flow sensor is arranged on the liquid flow pipeline and connected with the PLC.
The flow sensor is used for detecting the flow in the liquid flow pipeline.
And pressure sensors are arranged on the anode electrolyte tank and the cathode electrolyte tank and are connected with the PLC.
The feedback quantity controlled by the control system PLC comprises a flow sensor, a pressure sensor and an OCV voltage. The control object comprises a programmable power supply, a positive frequency converter, a negative frequency converter, a cathode frequency converter and an anode frequency converter.
Wherein, the PLC is connected with a touch screen.
Preferably, the open-circuit voltage measuring cell is connected to the operating stack through a pipe. After the OCV cell measures the open circuit voltage, the electrolyte therein flows back to the working stack.
The utility model discloses a PLC is as main control unit, through the degree of the work galvanic pile capacity decay that detects, starts the charging power supply able to programme and carries out the charging process and then reach the unnecessary Fe of electrolysis reduction cathode electrolyte to rebalance group battery 3+ The rebalancing of the ionic valence states of various ions in the electrolytes of the anode and the cathode of the energy storage system is completed; and is made of Fe 3+ The concentration value sets the charging time. In the process, the PLC controls the output signal of the frequency converter according to the rated working condition requirement of the electrolyte rebalance system of the iron-chromium liquid flow energy storage system by monitoring the flow of the electrolyte in the liquid flow pipeline, and adjusts the flow rate of the electrolyte entering the iron-chromium liquid flow battery pack. The touch screen is used as a human-computer interface to set system working parameters and monitor system operation data.
The electrolyte rebalancing device of the iron-chromium flow battery energy storage system is provided with an OCV battery for detecting the attenuation condition of the battery capacity and judging the rebalancing opportunity, thereby realizing the automatic operation of the system. The deterioration of the battery capacity is determined by the change in the voltage of the OCV battery during the charge and discharge, and for example, the rebalance system may be started with the capacity deteriorated to 20%.
The utility model provides necessary conditions and infrastructure for the stable and reliable operation of the iron-chromium flow battery energy storage system.
Drawings
FIG. 1 is a schematic diagram of a control device of the present invention;
fig. 2 is a schematic diagram of the rebalancing device.
The corresponding relationship between the devices and the numbers in the figure is as follows:
the rebalance battery pack 1, the programmable charging power supply 2, the anode tank 3, the working pile 4, the cathode circulating pump 5, the cathode electrolyte tank 6, the anode electrolyte tank 7, the anode circulating pump 8, the PLC9 and the OCV battery 10.
Detailed Description
The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "center", "front", "rear", "left", "right", "vertical", "horizontal", "upper", "lower", "front", "back", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and that the terms are used merely for convenience in describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated; and therefore should not be interpreted as limiting the scope of the invention.
In the examples, the technical means used are all the technical means existing in the field, unless otherwise specified.
Example 1
Referring to fig. 2, the present embodiment provides an electrolyte rebalancing device for an energy storage system of an iron-chromium redox flow battery, including a rebalancing battery pack 1, an OCV battery 10, a programmable charging power supply 2, and a PLC9;
the working electric pile 4 is connected with a positive electrolyte tank 7 and a negative electrolyte tank 6, the positive electrolyte tank 7 and the negative electrolyte tank 6 are connected with the open-circuit voltage measuring battery through pipelines, and the open-circuit voltage measuring battery is in communication connection with a PLC9; the positive electrode electrolyte tank 7 is connected with the rebalance battery pack 1 through a rebalance electrolyte pipeline; the rebalance battery pack 1 is connected with a rebalance electrolyte tank 3; the programmable charging power supply 2 is connected with the electrode of the rebalance battery pack 1;
the PLC9 is connected with the programmable charging power supply 2.
The working electric pile is respectively connected with the anode electrolyte tank 7 and the cathode electrolyte tank 6 through an anode liquid flow pipeline and a cathode liquid flow pipeline, an anode circulating pump 8 and a cathode circulating pump 7 are respectively arranged on the anode liquid flow pipeline and the cathode liquid flow pipeline, the PLC is connected with an anode frequency converter and a cathode frequency converter, the anode frequency converter is connected to the anode circulating pump 8, and the cathode frequency converter is connected to the cathode circulating pump 5. And the rebalance electrolyte pipeline is provided with a cathode pump and an anode pump which are respectively controlled by a cathode frequency converter and an anode frequency converter, and the cathode frequency converter and the anode frequency converter are connected with the PLC9.
And a flow sensor is arranged on the liquid flow pipeline and is connected with the PLC9.
The flow sensor detects a flow rate in the fluid flow line.
And pressure sensors are arranged on the anode electrolyte tank and the cathode electrolyte tank and are connected with the PLC9.
The PLC is connected with a touch screen (see fig. 1). The OCV cell 10 is connected to the operating stack 4 through a pipe.
Although the present invention has been described above by way of examples, it should be understood by those skilled in the art that modifications and variations of the present invention are within the scope of the present invention without departing from the spirit and nature of the present invention.

Claims (6)

1. An electrolyte rebalancing device of an iron-chromium flow battery energy storage system is characterized by comprising a working electric pile, a rebalancing battery pack, an open-circuit voltage measuring battery, a programmable charging power supply and a PLC (programmable logic controller);
the working electric pile is connected with an anode electrolyte tank and a cathode electrolyte tank, the anode electrolyte tank and the cathode electrolyte tank are connected with the open-circuit voltage measuring battery through rebalance electrolyte pipelines, and the open-circuit voltage measuring battery is in communication connection with the PLC; the rebalance electrolyte pipeline is provided with a cathode pump and an anode pump which are respectively controlled by a cathode frequency converter and an anode frequency converter, and the cathode frequency converter and the anode frequency converter are connected with the PLC; the negative electrode electrolyte tank is connected with the rebalance battery pack through a pipeline; the rebalance battery pack is connected with a rebalance electrolyte tank; the programmable charging power supply is connected with the electrode of the rebalance battery pack; the PLC is connected with the programmable charging power supply.
2. The electrolyte rebalancing device according to claim 1, wherein the working stack is connected to the positive electrolyte tank and the negative electrolyte tank through a positive flow pipeline and a negative flow pipeline respectively, a positive circulation pump and a negative circulation pump are disposed on the positive flow pipeline and the negative flow pipeline respectively, the PLC is connected to a positive frequency converter and a negative frequency converter, the positive frequency converter is connected to the positive circulation pump, and the negative frequency converter is connected to the negative circulation pump.
3. The electrolyte rebalancing device of an iron-chromium flow battery energy storage system according to claim 2, wherein flow sensors are disposed on both the positive flow line and the negative flow line, and the flow sensors are connected to the PLC.
4. The electrolyte rebalancing device of an iron-chromium flow battery energy storage system according to claim 1, wherein pressure sensors are arranged on both the positive electrolyte tank and the negative electrolyte tank, and the pressure sensors are connected with the PLC.
5. The iron-chromium flow battery energy storage system electrolyte rebalancing device of claim 1, wherein the PLC is connected with a touch screen.
6. The electrolyte rebalancing device for an iron-chromium flow battery energy storage system according to any one of claims 1 to 5, wherein the open-circuit voltage measuring battery is connected with the working pile through a pipeline.
CN202222486099.3U 2022-09-20 2022-09-20 Electrolyte rebalancing device of iron-chromium flow battery energy storage system Active CN217655916U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202222486099.3U CN217655916U (en) 2022-09-20 2022-09-20 Electrolyte rebalancing device of iron-chromium flow battery energy storage system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202222486099.3U CN217655916U (en) 2022-09-20 2022-09-20 Electrolyte rebalancing device of iron-chromium flow battery energy storage system

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CN217655916U true CN217655916U (en) 2022-10-25

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