CN111273182B - Flow battery bipolar plate structure and method for measuring current distribution - Google Patents
Flow battery bipolar plate structure and method for measuring current distribution Download PDFInfo
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- CN111273182B CN111273182B CN202010113566.0A CN202010113566A CN111273182B CN 111273182 B CN111273182 B CN 111273182B CN 202010113566 A CN202010113566 A CN 202010113566A CN 111273182 B CN111273182 B CN 111273182B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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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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- 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
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- 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
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Abstract
The invention discloses a flow battery bipolar plate structure and a method for measuring current distribution, and particularly relates to the field of flow energy storage batteries, wherein the flow battery bipolar plate structure comprises a PVC (polyvinyl chloride) plate frame, a mother bipolar plate and n pairs of sub bipolar plates, wherein the n pairs of sub bipolar plates are respectively arranged on two sides of the PVC plate frame; the two sides of the upper surface and the lower surface of the mother bipolar plate are respectively provided with n caulking grooves, and the corresponding two caulking grooves on the upper surface and the lower surface of the mother bipolar plate form a caulking groove group; every pair of sub-bipolar plate all includes two independent graphite electrode, and two graphite electrode cooperatees with two caulking grooves of caulking groove group respectively, graphite electrode one end is inserted the caulking groove inboard, and the other end is equipped with the terminal and extends to the PVC sheet frame outside. The invention adopts n sub-bipolar plates embedded on the PVC plate frame, and leads n pairs of terminals out of the PVC plate frame, and the current distribution condition in the bipolar plate is measured by using the current flowing between the n pairs of terminals, so as to obtain the actual measurement result of the current density distribution on the bipolar plate.
Description
Technical Field
The embodiment of the invention relates to the field of flow energy storage batteries, in particular to a flow battery bipolar plate structure and a flow battery bipolar plate method for measuring current distribution.
Background
The large-scale energy storage technology has large output power and energy storage capacity, and the damage and loss of safety accidents are large, so the primary condition for developing the corresponding energy storage technology is safety and reliability. The all-vanadium redox flow battery is suitable for large-scale energy storage. And the electrolyte of the all-vanadium flow battery is pumped into the galvanic pile from a storage tank through a liquid pump. The ampere-hour (Ah) capacity of the cell depends on the amount of active species in the electrolyte, and the power depends on the stack output voltage and current. The output voltage of the electric pile is determined by the serial connection number of the single batteries, and the output current of the electric pile is determined by the product of the area of the single batteries and the current density. The larger the area of the electrode is in the scale amplification process of the all-vanadium redox flow battery, and the electrolyte among the monomers is conveyed through the main liquid conveying pipe and conveyed from the inlet of the monomer battery to the outlet of the monomer battery through the branch, so that the electrolyte in the monomer battery is not uniformly distributed, the larger the area is, the longer the path of the electrolyte passing through the monomer battery is, the more uniform the electrolyte concentration and the current distribution are, and the local over-high concentration of the electrolyte influences the service life of the battery and reduces the battery performance. Especially when the charging is continued under the condition of lower charging depth or the charging is continued under the condition of higher charging depth, the unbalance degree of the current distribution is more obvious. Therefore, local active vanadium ions have too low concentration, serious concentration polarization, too high voltage and too large current, side reaction is easy to cause, the service life of the battery is shortened, and potential safety hazard is brought. In order to improve the performance, safe operation and prolong the service life of the battery, the distribution of current in the single battery is necessary to be researched.
So far, the theoretical research on the current distribution in the single battery is more, but the experimental data is lacked.
The patent CN201710127267 bipolar plate for flow battery and the preparation method thereof: the bipolar plate was prepared without using the measurement aspect of current distribution.
The Yincongting Tohao full vanadium redox flow battery is subjected to three-dimensional simulation, and the east electrical comment, 2013: the distribution of current density is analyzed by establishing a three-dimensional charge coupled model theory.
Patent CN200910248844 is a split end plate structure of a proton exchange membrane fuel cell for measuring current distribution: is a structure of a fuel cell end plate for current measurement; however, the fuel cell and the flow battery have different structures and principles.
As can be seen from the above, the current density distribution on the bipolar plate is not actually measured, and therefore, the present invention provides a structure for measuring the current distribution in the flow battery. At present, no method for measuring the current on the bipolar plate in the vanadium cell stack is proposed. If the current distribution on the bipolar plate can be measured, a useful basis is provided for the safe operation of the cell and the design of the cell.
Disclosure of Invention
Therefore, embodiments of the present invention provide a flow battery bipolar plate structure and a method for measuring current distribution, in which a plurality of pairs of independent sub-bipolar plates with equal areas are embedded on the front and back sides of a PVC plate frame by using the electronic conductivity of the bipolar plate, n pairs of terminals are led out of the PVC plate frame, and the current distribution condition in the bipolar plate is measured by using the current flowing between the n pairs of terminals, so as to obtain the actual measurement result of the current density distribution on the bipolar plate, thereby solving the problem caused by the lack of the actual measurement result of the current density distribution on the bipolar plate in the prior art.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions: a flow battery bipolar plate structure for measuring current distribution comprises a PVC plate frame, a mother bipolar plate and n pairs of sub bipolar plates, wherein the n pairs of sub bipolar plates are respectively arranged on two sides of the PVC plate frame and are fixedly connected with the PVC plate frame;
the two sides of the upper surface and the lower surface of the parent bipolar plate are respectively provided with n caulking grooves, the caulking grooves on the upper surface and the lower surface are mutually corresponding up and down, and the corresponding two caulking grooves on the upper surface and the lower surface of the parent bipolar plate form a caulking groove group;
every pair of sub-bipolar plate all includes two independent graphite electrode, and two graphite electrode cooperatees with two caulking grooves of caulking groove group respectively, graphite electrode one end is inserted the caulking groove inboard, and the other end is equipped with the terminal and extends to the PVC sheet frame outside.
Furthermore, the n caulking grooves are uniformly distributed in a straight line shape.
Furthermore, the graphite electrode is connected with the caulking groove in an adhesive mode through a sealant.
The invention also comprises a method for measuring current distribution by adopting the flow battery bipolar plate structure, which comprises the following specific measurement steps:
s1, grooving the two sides of the upper surface and the lower surface of the mother bipolar plate to form caulking grooves, preparing n pairs of the bipolar plates, namely n pairs of graphite electrodes, respectively embedding the n pairs of graphite electrodes into the n caulking groove groups, ensuring that a terminal at one end of the graphite electrodes extends to the outer side of the PVC plate frame, and respectively bonding and sealing the graphite electrodes and the mother bipolar plate with the PVC plate frame by sealant to complete the installation of the bipolar plate of the flow battery;
and S2, measuring the current between the terminals led out from the n pairs of graphite electrodes to the outside of the PVC plate frame, and representing the current in the sub-bipolar plate by using the current measurement value.
Further, the current between the terminals described in step S2 is measured using a digital multimeter.
Further, the sub-bipolar plates can be embedded at any position during the cell preparation process to measure the current distribution at any position in the PVC plate frame.
The embodiment of the invention has the following advantages:
1. the invention utilizes the electronic conductivity of the bipolar plate, a plurality of pairs of independent sub-bipolar plates with equal area are embedded on the front and back surfaces of the mother bipolar plate, n pairs of terminals are led out of the PVC plate frame, and the current distribution condition in the bipolar plate is measured by utilizing the current flowing between the n pairs of terminals, so that the actual measurement result of the current density distribution on the bipolar plate can be obtained;
2. through adopting n to pair bipolar plate embedding to install in the caulking groove on female bipolar plate, and draw forth n to the PVC sheet frame outside to the terminal, measure the electric current between the terminal plate, can obtain the distribution condition of electric current on the bipolar plate, can be used for improving the distribution of flow field, improve the performance and the battery operation security of battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a top view of a PVC sheet frame provided by the present invention;
FIG. 2 is a top view of the mating of the PVC sheet frame and bipolar plate provided by the present invention;
FIG. 3 is a schematic view of a bipolar plate mounting and end plate current measuring structure when the upper and lower surfaces of a PVC plate frame provided by the invention are disassembled;
in the figure: 1PVC plate frame, 2 mother bipolar plates, 3 son bipolar plates and 4 caulking grooves.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the attached drawings 1-2 of the specification, the flow cell bipolar plate structure for measuring current distribution of the embodiment comprises a PVC plate frame 1, a mother bipolar plate 2 and n pairs of sub bipolar plates 3, wherein the n pairs of sub bipolar plates 3 are respectively arranged on two sides of the PVC plate frame 1 and fixedly connected with the PVC plate frame 1;
the two sides of the upper surface and the lower surface of the parent bipolar plate 2 are respectively provided with n caulking grooves 4, the caulking grooves 4 on the upper surface and the lower surface are mutually corresponding up and down, and the two corresponding caulking grooves 4 on the upper surface and the lower surface of the parent bipolar plate 2 form a caulking groove group;
each pair of sub-bipolar plates 3 comprises two independent graphite electrodes, the two graphite electrodes are respectively matched with the two caulking grooves 4 of the caulking groove group, one end of each graphite electrode is inserted into the inner side of each caulking groove 4, and the other end of each graphite electrode is provided with a terminal and extends to the outer side of the PVC plate frame 1.
Furthermore, the n caulking grooves 4 are uniformly distributed in a straight shape.
Further, the graphite electrode is connected with the caulking groove 4 in an adhesive mode through a sealing glue.
The implementation scenario is specifically as follows: the invention utilizes the electronic conductivity of the mother bipolar plate 2, a plurality of pairs of independent sub bipolar plates 3 with equal area are embedded on the front and back surfaces of the mother bipolar plate 2, n pairs of terminals are led out of the PVC plate frame 1, and the current distribution condition in the PVC plate frame 1 is measured by utilizing the current flowing between the n pairs of terminals.
Referring to the attached fig. 3 in the specification, a method for measuring current distribution by using the bipolar plate structure of the flow battery in this embodiment includes the following specific measurement steps:
s1, grooving the upper surface and the lower surface of the mother bipolar plate 2 to form an embedded groove 4, preparing n sub bipolar plates 3, namely n pairs of graphite electrodes, respectively embedding the n pairs of graphite electrodes into the n embedded groove groups, ensuring that a terminal at one end of the graphite electrodes extends to the outer side of the PVC plate frame 1, and respectively bonding and sealing the graphite electrodes and the mother bipolar plate 2 with the PVC plate frame 1 by sealant to finish the installation of the bipolar plate of the flow battery;
and S2, measuring the current between the terminals led out from the n pairs of graphite electrodes to the outside of the PVC plate frame 1, and representing the current in the sub bipolar plate 3 by using the current measurement value.
Further, the current between the terminals described in step S2 is measured using a digital multimeter.
Further, the sub-bipolar plate 3 can be embedded at any position during the cell manufacturing process to measure the current distribution at any position in the PVC plate frame 1.
By the measuring method, the current distribution condition on the sub bipolar plate 3 can be obtained, and the actual measurement result of the current density distribution on the sub bipolar plate 3 can be obtained, so that the distribution of the flow field is improved, and the performance and the operation safety of the battery are improved.
Example 1:
in the specific application, 12 graphite electrodes with the length of 8mm multiplied by 2mm are processed, and the 6 sub-bipolar plates 3 are formed by adopting 12 graphite electrodes;
6 grooves (namely caulking grooves 4) with the length of 4mm multiplied by 3mm multiplied by 2.5 mm are dug on the front side and the back side of the mother bipolar plate 2;
respectively embedding 6 pairs of graphite electrodes into embedding grooves 4 on the front surface and the back surface of a mother bipolar plate 2, keeping 6 sub bipolar plates 3 to respectively lead out terminals to the outside of a PVC plate frame 1, and finally sealing by using a sealant;
and measuring the current between the 6 pairs of end plates at the corresponding positions by using a digital multimeter or other current measuring equipment, namely the distribution condition of the current in the sub bipolar plates 3.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (6)
1. The utility model provides a measure current distribution's flow battery bipolar plate structure which characterized in that: the composite plate comprises a PVC plate frame (1), a mother bipolar plate (2) and n pairs of sub bipolar plates (3), wherein the n pairs of sub bipolar plates (3) are respectively arranged on two sides of the PVC plate frame (1) and are fixedly connected with the PVC plate frame (1);
the two sides of the upper surface and the lower surface of the parent bipolar plate (2) are respectively provided with n caulking grooves (4), the caulking grooves (4) on the upper surface and the lower surface are mutually corresponding up and down, and the two corresponding caulking grooves (4) on the upper surface and the lower surface of the parent bipolar plate (2) form a caulking groove group;
each pair of bipolar plates (3) comprises two independent graphite electrodes, the two graphite electrodes are respectively matched with the two caulking grooves (4) of the caulking groove group, one end of each graphite electrode is inserted into the inner side of each caulking groove (4), and the other end of each graphite electrode is provided with a terminal and extends to the outer side of the PVC plate frame (1);
by utilizing the electronic conductivity of the mother bipolar plate (2), a plurality of pairs of independent sub bipolar plates (3) with equal areas are embedded on the front and back surfaces of the mother bipolar plate (2), n pairs of terminals are led out of the PVC plate frame (1), and the current distribution condition in the PVC plate frame (1) is measured by utilizing the current flowing between the n pairs of terminals.
2. The flow battery bipolar plate structure for measuring current distribution according to claim 1, wherein: the n caulking grooves (4) are uniformly distributed in a straight line shape.
3. The flow battery bipolar plate structure for measuring current distribution according to claim 1, wherein: the graphite electrode is connected with the caulking groove (4) in an adhesive mode through a sealant.
4. A method for measuring current distribution using the bipolar plate structure of a flow battery of any one of claims 1-3, wherein: the specific measurement steps are as follows:
s1, grooving two sides of the upper surface and the lower surface of the mother bipolar plate (2) to form an embedded groove (4), preparing n pairs of the bipolar plates (3), namely n pairs of graphite electrodes, respectively embedding the n pairs of graphite electrodes into the n embedded groove groups, ensuring that a terminal at one end of the graphite electrodes extends to the outer side of the PVC plate frame (1), and respectively bonding and sealing the graphite electrodes and the mother bipolar plate (2) with the PVC plate frame (1) by sealant to complete the installation of the bipolar plates of the redox flow battery;
and S2, measuring the current between the terminals led out from the n pairs of graphite electrodes to the outside of the PVC plate frame (1), and representing the current in the sub bipolar plate (3) by using the current measurement value.
5. The method of claim 4, wherein the method comprises the steps of: the current between the terminals described in step S2 was measured using a digital multimeter.
6. The method of claim 4, wherein the method comprises the steps of: during the process of preparing the cell, the sub bipolar plate (3) can be embedded into any position to measure the current distribution at any position in the PVC plate frame (1).
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| CN202010113566.0A CN111273182B (en) | 2020-02-24 | 2020-02-24 | Flow battery bipolar plate structure and method for measuring current distribution |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101325252B (en) * | 2007-06-15 | 2010-09-29 | 清华大学 | Double pole plate for fluid flow battery |
| CN101206247A (en) * | 2007-10-09 | 2008-06-25 | 新源动力股份有限公司 | Method for measuring fuel cell internal current |
| CN102569833A (en) * | 2010-12-17 | 2012-07-11 | 上海空间电源研究所 | Bipolar plate of redox flow battery |
| CN102569843B (en) * | 2012-01-13 | 2014-10-29 | 清华大学 | Embedded electrode frame of flow cell pile |
| CN202888323U (en) * | 2012-08-03 | 2013-04-17 | 上海神力科技有限公司 | Electric pile structure of flow battery having less possibility of leaking |
| CN103413960B (en) * | 2013-08-26 | 2015-07-29 | 中国东方电气集团有限公司 | Flow battery and liquid stream battery stack |
| CN109037725B (en) * | 2018-06-20 | 2023-06-02 | 浙江大学 | Flow battery capable of improving distribution uniformity of electrolyte, electrode structure and method |
| CN109786783B (en) * | 2019-01-26 | 2023-04-25 | 杭州德海艾科能源科技有限公司 | Electrode frame for flow battery with multi-cavity structure and battery stack formed by electrode frame |
| CN110010934B (en) * | 2019-04-19 | 2021-11-19 | 山东科技大学 | Method for measuring resistance of electrolyte of flow battery on line |
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Application publication date: 20200612 Assignee: Shandong Hongsaier Intelligent Technology Co.,Ltd. Assignor: SHANDONG University OF SCIENCE AND TECHNOLOGY Contract record no.: X2023370010003 Denomination of invention: Structure and method of bipolar plate of liquid flow battery for measuring current distribution Granted publication date: 20220201 License type: Common License Record date: 20230106 |
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