CN112993360B - Zinc-bromine single-flow galvanic pile and battery - Google Patents
Zinc-bromine single-flow galvanic pile and battery Download PDFInfo
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- CN112993360B CN112993360B CN201911283755.6A CN201911283755A CN112993360B CN 112993360 B CN112993360 B CN 112993360B CN 201911283755 A CN201911283755 A CN 201911283755A CN 112993360 B CN112993360 B CN 112993360B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M8/184—Regeneration by electrochemical means
- H01M8/188—Regeneration by electrochemical means by recharging of redox couples containing fluids; Redox flow type batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04276—Arrangements for managing the electrolyte stream, e.g. heat exchange
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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
Abstract
The invention discloses a zinc-bromine single-flow galvanic pile and a battery. The electric pile comprises a battery unit, an electric pile supporting body and a current blocking body; the cell stack support comprises a first cell stack support body and a second cell stack support body, wherein the first cell stack support body and the second cell stack support body are respectively positioned on two opposite side surfaces of the cell unit and are used for supporting and fastening the cell unit; the flow blocking body comprises a first flow blocking body and a second flow blocking body, and the first flow blocking body and the second flow blocking body are respectively positioned between the first electric pile supporting body and the battery unit and between the second electric pile supporting body and the battery unit and are used for prolonging the flow of electrolyte flowing into or out of the battery unit. According to the invention, the flow blocking body is additionally arranged between the pile support body and the battery unit, so that the first battery unit and the last battery unit of the pile are prevented from being positioned at the tail end of a common flow channel, the pressure difference of electrolyte flowing through the inlet and the outlet of each battery unit is balanced, the electrolyte of the pile is more uniformly distributed, and the running stability of the pile is higher.
Description
Technical Field
The invention belongs to the technical field of flow battery energy storage, and particularly relates to a zinc-bromine single-flow galvanic pile and a battery.
Background
The zinc-bromine flow battery is a low-cost, high-efficiency and environment-friendly flow energy storage battery, has the advantages of high energy density and current efficiency, simple and easy operation of the device, long service life, low cost and the like, and is mainly applied to the fields of power grid peak shaving, power generation of renewable energy sources such as wind energy, solar energy and the like, electric vehicles and the like. The traditional zinc-bromine flow battery adopts a double-pump and double-pipeline design, and in the charging and discharging process, a circulating pump is used for driving electrolyte to circularly flow in the battery. However, the zinc-bromine flow battery needs an electrolyte circulation system such as a circulating pump and a liquid storage tank, so that the energy efficiency of the zinc-bromine flow battery is reduced due to the influence of system loss, and on the other hand, the zinc-bromine flow battery has a complex system structure due to the auxiliary equipment of the batteries, which is not beneficial to miniaturization and reduces the energy density of the battery.
The zinc-bromine single flow battery is used as an optimized product of the zinc-bromine flow battery, the anode and the cathode adopt the same electrolyte solution, only one set of electrolyte storage and circulation system is needed, and the zinc-bromine single flow battery has the advantages of simple structure and high energy density. The existing zinc-bromine single flow battery pile is formed by connecting a single battery unit or a plurality of battery units in series, and the battery units are arranged close to a pile support body; the positive electrode active substance is sealed in the battery unit, so that the pollution of positive electrode bromine is reduced; meanwhile, when the battery is operated for the first time, electrolyte is infused into the positive electrode of the battery unit and sealed in the positive electrode, so that the electrolyte on one side of the positive electrode does not need to flow, and a positive electrolyte circulating pump and a positive electrolyte storage tank are not needed when the battery is operated, so that the battery cost is saved, and the battery is more environment-friendly.
However, in the existing zinc-bromine single flow battery, because the first battery cell and the last battery cell of the pile are both directly close to the pile support body, a flow node is generated between the two battery cells, and the pressure of the electrolyte at the position close to the flow node is higher, namely, the electrolyte is positioned at the tail ends of the pile liquid inlet common flow channel and the pile liquid outlet common flow channel when flowing into the last battery cell of the pile and flowing out of the first battery cell of the pile, and the pressure of the electrolyte at the position is higher. The pressure of the electrolyte flowing through the electrolyte inlets and the electrolyte outlets of the two battery units close to the stack support is greatly different from the pressure of the electrolyte flowing through the electrolyte inlets and the electrolyte outlets of the other battery units in the middle, so that the electrolyte flow of the two battery units of the zinc-bromine single flow battery close to the stack support is different from the electrolyte flow of the other battery units in the middle, and the uniformity of the battery is poor.
Disclosure of Invention
The invention aims to provide a zinc-bromine single-flow galvanic pile and a battery, which solve the problems of poor distribution uniformity of battery electrolyte and insufficient operation stability of the galvanic pile caused by larger difference between the pressure of the electrolyte flowing through the electrolyte inlets and the electrolyte outlets of two battery units close to a galvanic pile support body and the pressure of the electrolyte flowing through the electrolyte inlets and the electrolyte outlets of other battery units in the middle of the existing zinc-bromine single-flow galvanic pile.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a zinc-bromine single-flow galvanic pile comprises a battery unit, a galvanic pile supporting body and a fluid blocking body;
the cell stack support comprises a first cell stack support body and a second cell stack support body, and the first cell stack support body and the second cell stack support body are respectively positioned on two opposite side surfaces of the cell unit and used for fixing the cell unit; the first stack support body and the second stack support body are respectively provided with a first channel for electrolyte to flow into or out of the battery unit;
the flow blocking body comprises a first flow blocking body and a second flow blocking body, the first flow blocking body is positioned between the first stack supporting body and the battery unit, and the second flow blocking body is positioned between the second stack supporting body and the battery unit; the first flow blocking body and the second flow blocking body are respectively provided with a second channel for the electrolyte to flow into or out of the battery unit; the second passage communicates with the first passage.
Preferably, the battery cell comprises a positive half cell and a negative half cell with a separator disposed therebetween.
Preferably, the positive half cell comprises a positive electrode frame and a positive electrode arranged in the positive electrode frame, and the negative half cell comprises a negative electrode frame and a negative electrode arranged in the negative electrode frame;
and electrolyte inlet and outlet holes and electrolyte channels are arranged on the positive electrode frame and the negative electrode frame.
Preferably, the second channel inlet/outlet is located at a projection position of the electrolyte inlet/outlet hole on the positive electrode frame or the negative electrode frame.
Preferably, the first fluid resistor generates the same flow resistance as the positive electrode frame, and the second fluid resistor generates the same flow resistance as the negative electrode frame.
Preferably, the first fluid blocking body is provided with a first groove, the second fluid blocking body is provided with a second groove, and the first groove and the second groove are both communicated with the second channel; the first current blocking body is adjacent to the positive electrode half cell;
an anode current blocking layer is arranged in the first groove, and a cathode current blocking layer is arranged in the second groove.
Preferably, a first current collector is arranged between the first current blocking body and the battery unit, and a second current collector is arranged between the second current blocking body and the battery unit;
all be provided with the electrolyte clearing hole on first mass flow body and the second mass flow body, the electrolyte clearing hole is located electrolyte business turn over hole projection position on positive electrode frame or the negative pole electrode frame.
Preferably, the first stack support comprises a first end fixing body and a first sub-fluid, and the second stack support comprises a second end fixing body and a second sub-fluid;
the first sub-fluid is positioned between the first end fixed body and the first flow blocking body, and the second sub-fluid is positioned between the second end fixed body and the second flow blocking body; the first branch fluid and the second branch fluid are provided with first channels.
Preferably, the battery unit is formed by connecting one battery unit or more than two battery units in series, and the battery units are connected in series through the bipolar plate.
In another aspect of the invention, a zinc-bromine single flow battery is provided, which comprises the zinc-bromine single flow galvanic pile described in any one of the above.
The invention has the beneficial effects that:
1. according to the invention, the flow blocking body is additionally arranged between the pile support body and the battery unit, so that the first battery unit and the last battery unit of the pile are prevented from being positioned at the tail end of a common flow channel, the flow of electrolyte is prolonged, and the pressure of the electrolyte at the electrolyte inlets and the electrolyte outlets of the first battery unit and the last battery unit of the pile is reduced;
2. the electrodes are arranged in the flow blocking bodies, so that the flow resistance generated by the flow blocking bodies is equivalent to the flow resistance generated by the electrode frames, the pressure difference between the electrolyte flowing through the first battery unit of the galvanic pile and the inlet and outlet of the last battery unit of the galvanic pile and the electrolyte flowing through the inlet and outlet of other battery units in the middle of the galvanic pile is further balanced, the electrolyte of the galvanic pile is distributed more uniformly, and the running stability of the galvanic pile is higher.
Drawings
FIG. 1 is a schematic structural diagram of a zinc-bromine single-flow galvanic pile of the present invention;
FIG. 2 is a schematic view of a structure of a bluff body;
FIG. 3 is a graph showing the cycle performance of a zinc bromine single flow battery in example 1 of the present invention;
FIG. 4 is a graph of the cycle performance of a zinc bromine single flow battery in example 2 of the present invention;
FIG. 5 is a graph of the cycling performance of a zinc bromine single flow battery in example 3 of the present invention;
FIG. 6 is a graph showing the cycle performance of a zinc-bromine single flow battery according to comparative example 1 of the present invention;
FIG. 7 is a graph showing the cycle performance of a zinc bromine single flow battery in comparative example 2 of the present invention;
FIG. 8 is a graph showing the cycle performance of the zinc-bromine single flow battery of comparative example 3 of the present invention.
In the figure, 1-1, a first end fixing body, 1-2, a second end fixing body, 2-1, a first sub-fluid, 2-2, a second sub-fluid, 3-1, a first fluid stop, 3-1-1, a positive electrolyte inlet, 3-1-2, a positive electrolyte outlet, 3-1-3, a negative electrolyte inlet, 3-1-4, a negative electrolyte outlet, 3-1-5, a barrier layer, 3-1-6, an electrolyte flow passage, 3-2, a second fluid stop, 4-1, a first current collector, 4-2, a second current collector, 5, a bipolar plate, 6-1, a positive half cell, 6-2, a negative half cell, 7 and a separating body.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
A zinc-bromine single-flow galvanic pile is shown in figure 1 and comprises a battery unit, a galvanic pile supporting body and a flow blocking body;
wherein the cell unit comprises a positive half-cell 6-1 and a negative half-cell 6-2, with a separator 7 disposed between the positive half-cell 6-1 and the negative half-cell 6-2.
The positive half cell 6-1 comprises a positive electrode frame and a positive electrode arranged in the positive electrode frame, the negative half cell 6-2 comprises a negative electrode frame and a negative electrode arranged in the negative electrode frame, and electrolyte inlet and outlet holes and an electrolyte flow channel are arranged on the positive electrode frame and the negative electrode frame.
Specifically, the positive electrode frame and the negative electrode frame are both flat-plate-shaped, and a negative electrolyte inlet, a negative electrolyte outlet, a positive electrolyte inlet and a positive electrolyte outlet are respectively arranged on the positive electrode frame and the negative electrode frame; and furthermore, the positive electrode frame and the negative electrode frame are rectangular flat plates, and the negative electrolyte inlet, the negative electrolyte outlet, the positive electrolyte inlet and the positive electrolyte outlet are respectively positioned at the four corners of the rectangle near the edges.
In the anode half cell 6-1, anode electrolyte flows through the anode from an anode electrolyte inlet through an anode electrolyte channel and then flows out from an anode electrolyte outlet; in the negative electrode half cell 6-2, the negative electrode electrolyte flows through the negative electrode from the negative electrode electrolyte inlet through the negative electrode electrolyte channel, and then flows out from the negative electrode electrolyte outlet. In the case of a single flow battery, the positive electrode electrolyte is sealed in the positive electrode half cell before the battery is operated.
The first stack support body and the second stack support body are respectively positioned on two opposite side surfaces of the battery unit and used for fixing the battery unit; the first stack support body and the second stack support body are respectively provided with a first channel for electrolyte to flow into or out of the battery unit.
The flow blocking bodies comprise a first flow blocking body 3-1 and a second flow blocking body 3-2, the first flow blocking body 3-1 is located between the first electric pile support body and the battery unit, the second flow blocking body 3-2 is located between the second electric pile support body and the battery unit, second channels used for flowing electrolyte into or out of the battery unit are arranged on the first flow blocking body 3-1 and the second flow blocking body 3-2, and the second channels are communicated with the first channels.
Specifically, the first stack support includes a first end fixture 1-1 and a first sub-fluid 2-1, and the second stack support includes a second end fixture 1-2 and a second sub-fluid 2-2. The battery unit is fixed by the clamping action of the first end fixing body 1-1 and the second end fixing body 1-2. The first sub-fluid 2-1 is positioned between the first end fixing body 1-1 and the first fluid blocking body 3-1, the second sub-fluid 2-2 is positioned between the second end fixing body 1-2 and the second fluid blocking body 3-2, and the first sub-fluid 2-1 and the second sub-fluid 2-2 are both provided with a first channel.
The second channel inlet and outlet on the first fluid stop body 3-1 and the second fluid stop body 3-2 are positioned at the projection position of the electrolyte inlet and outlet on the positive electrode frame or the negative electrode frame.
Preferably, the thickness of the first fluid stop body 3-1 is the same as that of the positive electrode frame, and the thickness of the second fluid stop body 3-2 is the same as that of the negative electrode frame;
the thickness of the choking body is the path length of the second channel.
In the specific implementation process, a flat frame structure identical to the positive electrode frame and the negative electrode frame can be adopted as the current blocking body, as shown in fig. 2, the current blocking body is respectively provided with a positive electrolyte inlet 3-1-1, a positive electrolyte outlet 3-1-2, a negative electrolyte inlet 3-1-3 and a negative electrolyte outlet 3-1-4, and is also provided with an electrolyte channel 3-1-6 for communicating the corresponding electrolyte outlet and inlet, the positions of the four electrolyte outlets and inlets on the current blocking body are identical to the positions of the electrolyte outlets and inlets of the positive electrode frame and the negative electrode frame, so that the electrolyte inlet of the electrode frame and the electrolyte inlet of the current blocking body form a liquid inlet common channel of the pile, the electrolyte outlet of the electrode frame and the electrolyte outlet of the current blocking body form a liquid outlet common channel of the pile, the battery units at the two ends of the galvanic pile are positioned at the tail end of the common flow channel under the condition that the battery units are connected in series, so that the pressure of electrolyte at the electrolyte inlet and outlet of the first battery unit and the last battery unit of the galvanic pile is reduced, the electrolyte can flow out of the electrode frame, the flowing state of the electrolyte when passing through the choking body can not be obviously changed, and the flow of the electrolyte is balanced while the electrolyte flow is prolonged.
Preferably, at least two first fluid blocking bodies 3-1 may be provided, and the number of the first fluid blocking bodies 3-1 is the same as that of the second fluid blocking bodies 3-2.
Specifically, the number of the first fluid blocking body 3-1 and the second fluid blocking body 3-2 is 2-10 respectively.
Preferably, the first fluid resistor 3-1 generates the same flow resistance as the positive electrode frame, and the second fluid resistor 3-2 generates the same flow resistance as the negative electrode frame.
Specifically, a first groove is formed in the first fluid blocking body 3-1, a second groove is formed in the second fluid blocking body 3-2, and the first groove and the second groove are communicated with the second channel; the first current blocking body 3-1 is adjacent to the positive electrode half cell;
the first grooves are internally provided with anode current blocking layers 3-1-5, and the second grooves are internally provided with cathode current blocking layers 3-1-5.
In the embodiment of the present invention, the bluff body may adopt the same structure as the electrode frame, and the electrode is also placed in the bluff body, that is: the first current blocking body has the same structure as the positive electrode frame, and the positive blocking layer is made of the same material as the positive electrode; the structure of the second bluff body is the same as that of the cathode electrode frame, and the cathode blocking layer is the same as that of the cathode material, so that the flow resistance of the electrode frame in the bluff body and the battery unit to the electrolyte is the same, the flow resistance of the electrolyte flowing through the first battery unit of the galvanic pile and the inlet and the outlet of the last battery unit of the galvanic pile is further balanced, the pressure difference of the electrolyte flowing through the inlet and the outlet of other battery units of the galvanic pile is further balanced, the electrolyte distribution of the galvanic pile is more uniform, and the running stability of the galvanic pile is higher. The choking body can be PVC polyvinyl chloride.
A first current collector 4-1 is arranged between the first current blocking body 3-1 and the battery unit, a second current collector 4-2 is arranged between the second current blocking body 3-2 and the battery unit, and electrolyte through holes are formed in the first current collector 4-1 and the second current collector 4-2 and are consistent with the projection positions of the electrolyte in-out holes in the positive electrode frame or the negative electrode frame. The first and second current collectors 4-1 and 4-2 direct current into and out of the battery cell during charging and discharging of the battery by direct contact with the battery cell electrodes. Specifically, the first current collector 4-1 and the second current collector 4-2 may be copper plates.
In the embodiment of the invention, the battery unit is formed by connecting one battery unit or more than two battery units in series, and the battery units are connected in series through the bipolar plate 5.
When the zinc-bromine single-flow galvanic pile provided by the invention operates, electrolyte flows into a second shunt 2-2 from an external pipeline, flows into a second choke 3-2 and each electrode frame of a battery unit respectively after passing through a liquid inlet common flow channel, flows into a liquid outlet common flow channel through each electrode frame of the battery unit and an electrolyte outlet of a first choke 3-1, and finally flows out of the galvanic pile after passing through the first shunt 2-1. Since the current blocking body is arranged outside the current collector, the electrolyte flows only in the first current blocking body 3-1 and the second current blocking body 3-2, and no electrochemical reaction occurs.
Example 1
The zinc-bromine single flow battery with the structure of the invention is assembled, and the electrode area is 800cm2The thicknesses of the positive electrode frame and the negative electrode frame are both 4mm, the thicknesses of the first fluid blocking body and the second fluid blocking body are both 4mm, and the number of the first fluid blocking body and the number of the second fluid blocking body are respectively 2. The charging and discharging current is 40mA/cm2The charging time was 60 minutes. And (3) serially connecting 20 battery units into a battery pack by using bipolar plates. The electrolyte of the battery pack is composed of 2mol/L of zinc bromide, 0.8mol/L of complexing agent and 3mol/L of potassium chloride solution, and the volume of the electrolyte is 50L.
Example 2
The zinc-bromine single flow battery with the structure of the invention is assembled, and the electrode area is 800cm2The thicknesses of the positive electrode frame and the negative electrode frame are both 4mm, the thicknesses of the first fluid blocking body and the second fluid blocking body are both 4mm, and the number of the first fluid blocking body and the number of the second fluid blocking body are respectively 5. The charging and discharging current is 40mA/cm2The charging time was 60 minutes. And (3) serially connecting 20 battery units into a battery pack by using bipolar plates. The electrolyte of the battery pack is composed of 2mol/L of zinc bromide, 0.8mol/L of complexing agent and 3mol/L of potassium chloride solution, and the volume of the electrolyte is 50L.
Example 3
The zinc-bromine single flow battery with the structure of the invention is assembled, and the electrode area is 800cm2The thicknesses of the positive electrode frame and the negative electrode frame are both 4mm, the thicknesses of the first fluid resistor and the second fluid resistor are both 4mm, and the number of the first fluid resistor and the second fluid resistorThe amounts were 10 each. The charging and discharging current is 40mA/cm2The charging time was 60 minutes. And (3) serially connecting 20 battery units into a battery pack by using bipolar plates. The electrolyte of the battery pack is composed of 2mol/L of zinc bromide, 0.8mol/L of complexing agent and 3mol/L of potassium chloride solution, and the volume of the electrolyte is 50L.
Comparative example 1
The zinc-bromine single flow battery in the prior art is assembled, and the electrode area is 800cm2The thickness of the positive electrode frame and the negative electrode frame is 4 mm. The charging and discharging current is 40mA/cm2The charging time was 60 minutes. And (3) serially connecting 20 battery units into a battery pack by using bipolar plates. The electrolyte of the battery pack is composed of 2mol/L of zinc bromide, 0.8mol/L of complexing agent and 3mol/L of potassium chloride solution, and the volume of the electrolyte is 50L.
Comparative example 2
The zinc-bromine single flow battery with the structure of the invention is assembled, and the electrode area is 800cm2The thicknesses of the positive electrode frame and the negative electrode frame are both 4mm, the thicknesses of the first fluid blocking body and the second fluid blocking body are both 4mm, and the number of the first fluid blocking body and the number of the second fluid blocking body are respectively 1. The charging and discharging current is 40mA/cm2The charging time was 60 minutes. And (3) serially connecting 20 battery units into a battery pack by using bipolar plates. The electrolyte of the battery pack is composed of 2mol/L of zinc bromide, 0.8mol/L of complexing agent and 3mol/L of potassium chloride solution, and the volume of the electrolyte is 50L.
Comparative example 3
The zinc-bromine single flow battery with the structure of the invention is assembled, and the electrode area is 800cm2The thicknesses of the positive electrode frame and the negative electrode frame are both 4mm, the thicknesses of the first fluid blocking body and the second fluid blocking body are both 4mm, and the number of the first fluid blocking body and the number of the second fluid blocking body are respectively 12. The charging and discharging current is 40mA/cm2The charging time was 60 minutes. And (3) serially connecting 20 battery units into a battery pack by using bipolar plates. The electrolyte of the battery pack is composed of 2mol/L of zinc bromide, 0.8mol/L of complexing agent and 3mol/L of potassium chloride solution, and the volume of the electrolyte is 50L.
The results of comparing the performance parameters of the zinc bromine single flow battery provided by the present invention with those of the zinc bromine single flow battery in the prior art are shown in table 1.
TABLE 1
| Coulombic efficiency | Efficiency of voltage | Energy efficiency | |
| Example 1 | 91.1％ | 84.2％ | 76.7％ |
| Example 2 | 92.3％ | 85.4％ | 78.8％ |
| Example 3 | 93.4％ | 86.7％ | 81.0％ |
| Comparative example 1 | 89.3％ | 79.5％ | 71.0％ |
| Comparative example 2 | 90.2％ | 80.5％ | 72.6％ |
| Comparative example 3 | 93.2％ | 86.4％ | 80.5％ |
Therefore, the coulombic efficiency, the voltage efficiency and the energy efficiency of the zinc-bromine single flow battery provided by the invention are higher than those of the zinc-bromine single flow battery in the prior art.
As can be seen from fig. 3, when the cycle number of the zinc-bromine single flow battery provided in example 1 exceeds 100, the performance of the battery still remains stable, the coulombic efficiency of the battery is above 91%, the voltage efficiency is about 84%, and the energy efficiency is above 76%, which indicates that the zinc-bromine single flow battery having the structure in example 1 has good cycle stability, and can continuously operate for more than 100 cycles without degradation.
As can be seen from fig. 4, the zinc-bromine single flow battery provided in example 2 has slightly higher coulombic efficiency and voltage efficiency than the zinc-bromine single flow battery provided in example 1, the energy efficiency is 78% or more, and the efficiency does not decay after 100 cycles of operation, which indicates that the uniformity of each cell can be improved by extending the path length of the second channel.
As can be seen from fig. 5, the zinc-bromine single flow battery provided in example 3 has higher coulombic efficiency and voltage efficiency than the zinc-bromine single flow batteries provided in examples 1 and 2, and has an energy efficiency of about 81%, indicating that the uniformity of the zinc-bromine single flow battery is further improved when the path length of the second channel is further extended.
As can be seen from fig. 6, in the zinc-bromine single flow battery in the prior art provided in comparative example 1, the performance is greatly attenuated every 20 cycles, the electrolyte needs to be recovered to continue to operate, the performance retention rate is poor, and the battery is unstable in operation. In the running process of the battery, the coulombic efficiency of the battery is about 90%, the voltage efficiency is about 83%, and the energy efficiency is about 75%, which are obviously lower than those of the zinc-bromine single flow battery provided by the embodiment.
As can be seen from fig. 7, the zinc-bromine single flow battery provided in comparative example 2 has low coulombic efficiency and low voltage efficiency compared to the zinc-bromine single flow battery provided in the examples, although the performance degradation of the battery itself is not significant after operating for a plurality of cycles. It can be seen that when the path length of the second channel is short, the blocking body cannot prolong the electrolyte flow to balance the uniformity of each battery in the battery unit.
As can be seen from fig. 8, the zinc-bromine single flow battery provided in comparative example 3 has coulombic efficiency and voltage efficiency comparable to those of the zinc-bromine single flow battery provided in example 3. It can be seen that when the length of the second passage reaches an upper limit value, the zinc-bromine single flow battery cannot be gained by continuously extending the length of the second passage. However, the volume of the zinc-bromine single flow battery is increased due to the increase of the number of the chokes, and the volume energy density of the battery is reduced.
Therefore, the zinc-bromine single-fluid galvanic pile provided by the invention has the advantages that the flow blocking body is additionally arranged between the galvanic pile support body and the battery unit, the pressure difference between the electrolyte flowing through the inlet and the outlet of the first battery unit and the last battery unit of the galvanic pile and the electrolyte flowing through the inlet and the outlet of the rest battery units in the middle of the galvanic pile is balanced, the stability of the zinc-bromine single-fluid galvanic pile can be effectively improved, the continuous operation capability of the zinc-bromine single-fluid galvanic pile is improved, and the performance of the battery is improved.
Claims (8)
1. The zinc-bromine single-flow galvanic pile is characterized by comprising at least one battery unit, a galvanic pile supporting body and a flow blocking body;
the cell stack support comprises a first cell stack support body and a second cell stack support body, and the first cell stack support body and the second cell stack support body are respectively positioned on two opposite side surfaces of the cell unit and used for fixing the cell unit; the first stack support body and the second stack support body are respectively provided with a first channel for electrolyte to flow into or out of the battery unit;
the current blocking bodies comprise a first current blocking body and a second current blocking body, the first current blocking body is positioned between the first stack supporting body and the battery unit, and the second current blocking body is positioned between the second stack supporting body and the battery unit; the first flow blocking body and the second flow blocking body are respectively provided with a second channel for electrolyte to flow into or out of the battery unit; the second passage is communicated with the first passage;
the first flow blocking body is provided with a first groove, the second flow blocking body is provided with a second groove, and the first groove and the second groove are both communicated with the second channel; the first current blocking body is adjacent to the positive electrode half cell;
the first grooves are internally provided with anode current blocking layers, and the second grooves are internally provided with cathode current blocking layers;
the first stack support comprises a first end fixing body and a first sub-fluid, and the second stack support comprises a second end fixing body and a second sub-fluid;
the first sub-fluid is located between the first end fixed body and the first bluff body, and the second sub-fluid is located between the second end fixed body and the second bluff body; the first channel is arranged on each of the first sub-fluid and the second sub-fluid.
2. The zinc-bromine single flow galvanic stack of claim 1, wherein the cell unit comprises a positive half cell and a negative half cell with a separator disposed therebetween.
3. The zinc-bromine single flow galvanic pile of claim 2,
the anode half cell comprises an anode electrode frame and an anode arranged in the anode electrode frame, and the cathode half cell comprises a cathode electrode frame and a cathode arranged in the cathode electrode frame;
and electrolyte inlet and outlet holes and electrolyte flow channels are arranged on the positive electrode frame and the negative electrode frame.
4. The zinc-bromine single-flow galvanic pile according to claim 3, wherein the second channel inlet/outlet is located at a projection position of the electrolyte inlet/outlet hole on the positive electrode frame or the negative electrode frame.
5. The zinc-bromine single-flow galvanic pile according to claim 3, wherein the first fluid blocking body generates the same flow resistance as the positive electrode frame, and the second fluid blocking body generates the same flow resistance as the negative electrode frame.
6. The zinc-bromine single flow galvanic pile of claim 3,
a first current collector is arranged between the first current blocking body and the battery unit, and a second current collector is arranged between the second current blocking body and the battery unit;
and the first current collector and the second current collector are provided with electrolyte through holes, and the electrolyte through holes are positioned on the positive electrode frame or the negative electrode frame, and the projection positions of the electrolyte inlet and outlet holes are the same.
7. The zinc-bromine single flow galvanic pile according to claim 1, wherein the at least one cell unit is formed by connecting one cell unit or more than two cell units in series, and the cell units are connected in series through bipolar plates.
8. A zinc-bromine single flow battery comprising the zinc-bromine single flow cell stack of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| EP3024075A1 (en) * | 2013-07-16 | 2016-05-25 | H2 Inc. | Redox flow battery or fuel cell stack provided with seal for preventing shunt current loss |
| CN106611861A (en) * | 2015-10-16 | 2017-05-03 | 中国科学院大连化学物理研究所 | Redox flow battery structure |
| KR20170052314A (en) * | 2015-11-04 | 2017-05-12 | 한국에너지기술연구원 | Redox flow battery |
| CN208923281U (en) * | 2018-11-28 | 2019-05-31 | 中国科学院大连化学物理研究所 | A kind of zinc bromine single flow battery |
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| CN103579658A (en) * | 2012-08-03 | 2014-02-12 | 上海神力科技有限公司 | Flow battery pile |
| EP3024075A1 (en) * | 2013-07-16 | 2016-05-25 | H2 Inc. | Redox flow battery or fuel cell stack provided with seal for preventing shunt current loss |
| KR20150088034A (en) * | 2014-01-23 | 2015-07-31 | 동국대학교 산학협력단 | Structure of single cell for Zinc-Bromine REDOX Flow Battery |
| CN106611861A (en) * | 2015-10-16 | 2017-05-03 | 中国科学院大连化学物理研究所 | Redox flow battery structure |
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