Electrode frame performance testing device based on current density distribution measurement

Abstract

The invention discloses an electrode frame performance test device based on current density distribution measurement, and relates to the technical field of electrode frame performance test.The electrode frame performance test device comprises a battery module, a measurement module and a display module, and targeted design and construction of an electrode frame performance test system are achieved according to the design of an electrode frame; the high-resolution measurement of the current density in the electrode frame of the flow battery is realized, and the performance analysis of the electrode frame is carried out. Meanwhile, the device can be designed for electrode frames with different designs, and has universality.

Description

Technical Field

[0001] The present invention relates to the technical field of electrode frame performance testing, and in particular to an electrode frame performance testing device based on current density distribution measurement. Background Art

[0002] Liquid flow battery energy storage technology is considered to be one of the key technologies for achieving large-scale storage of renewable energy such as solar energy and wind energy. The performance of liquid flow batteries directly determines their renewable energy absorption capacity and commercialization costs. As an important component of the liquid flow battery stack, the electrode frame design directly determines the distribution of the electrolyte in the reaction area, directly affects the internal resistance and stability of the liquid flow battery, and thus affects the performance and life of the liquid flow battery. Uneven electrolyte distribution means uneven current density distribution, which will in turn aggravate the polarization of the battery and lose battery performance and power. Therefore, the current density distribution is an important indicator for measuring the performance of the electrode frame; currently, the use of printed circuit boards and bipolar plates based on block design is one of the best ways to measure current density distribution.

[0003] Since battery stack designs of different powers correspond to electrode frame designs of different sizes, in order to promote the uniform distribution of the battery stack electrolyte in the active area, the shunt design and active area area of ​​the electrode frame are also different; in addition, due to the compact and complex structure of the battery stack, it is difficult to introduce the printed circuit board into the battery stack structure. At the same time, the existing fixture has problems such as small size, and it is difficult to realize the performance test of electrode frames of different sizes. Therefore, in order to realize this method to measure the performance of the electrode frame, it is necessary to assemble the electrode frame into the single cell and design the performance test fixture according to the size of the electrode frame.

[0004] Therefore, an electrode frame performance testing device based on current density distribution measurement is proposed to solve the above problems. Summary of the invention

[0005] In view of this, the technical problem to be solved by the present invention is to propose an electrode frame performance testing device based on current density distribution measurement to solve the problems in the prior art of uneven fixture stress distribution, different electrode frame sizes, and difficulty in achieving electrode frame performance testing.

[0006] To achieve the above object, the present invention provides the following technical solution: an electrode frame performance testing device based on current density distribution measurement, comprising a battery module, a measuring module and a display module, wherein the battery module comprises a liquid flow battery, wherein:

[0007] The liquid flow battery is composed of a printed circuit board, a bipolar plate body, an electrode frame, an electrode, a current collecting plate, an end plate and a diaphragm. The bipolar plate body includes a first bipolar plate and a second bipolar plate. The printed circuit board, the first bipolar plate, the second bipolar plate, the electrode frame, the electrode, the current collecting plate, and the end plate are symmetrically arranged on both sides of the diaphragm, wherein the first bipolar plate is a block bipolar plate;

[0008] The measuring module includes a charge and discharge tester and a data acquisition card. The charge and discharge tester is connected to the current collecting plate in the battery module through a wire with an alligator clip. The data acquisition card is connected to the display unit through a data line. The data acquisition card is used to collect the voltage signal across each resistor in the printed circuit board and transmit it to the display unit.

[0009] The display module is responsible for recording and analyzing the collected data in real time and drawing the real-time current density distribution cloud map in the electrode frame;

[0010] As a preferred embodiment, the fixture for measuring the current density distribution in the electrode frame of the flow battery is mainly composed of an end plate, a current collecting plate, a printed circuit board, and a divided bipolar plate;

[0011] Preferably, a block area is provided in the block bipolar plate, the block bipolar plate is consistent with the outer dimensions of the electrode frame, the block area of ​​the block bipolar plate is the active area of ​​the electrode frame, the size, number and interval between the blocks of the block bipolar plate are determined by the size of the active area of ​​the electrode frame, the block bipolar plate and the electrode frame are provided with liquid inlet and outlet ports, the liquid inlet and outlet port of the block bipolar plate is smaller than the liquid inlet and outlet port of the electrode frame, a threaded hole is provided on the side of the block bipolar plate, a liquid inlet and outlet pipe is installed in the threaded hole, and the thickness of the block bipolar plate should be greater than the diameter of the liquid inlet and outlet port of the electrode frame;

[0012] Preferably, the spacing between the blocks in the block area of ​​the block bipolar plate is greater than 0.5 mm and less than 2 mm, the area of ​​a single block in the block bipolar plate accounts for 1 / 100-1 / 36 of the total active area, the area of ​​a single block in the block bipolar plate needs to be determined according to actual conditions, and the bipolar plate body material is graphite;

[0013] Preferably, the block intervals in the block area of ​​the block bipolar plate are uniformly filled with resin, and the blocks are insulated from each other by the resin. A filling groove is provided on the periphery of the block area of ​​the block bipolar plate, and the filling groove is uniformly filled with resin to reduce the influence of the lateral current.

[0014] Preferably, a block area is also provided in the printed circuit board, and the block design in the block area of ​​the printed circuit board is smaller than or the same as the block design of the block bipolar plate, each block of the block bipolar plate is electrically connected to a resistor, and a current collecting area is provided on the back of the printed circuit board, and the block current of the block bipolar plate flows into the resistor through the printed circuit board block, and the current in the resistor flows to the current collecting area, and the two ends of the resistor are electrically connected to the voltage output end, and the voltage lines at the two ends of the resistor are integrated through the embedded circuit connection of the printed circuit board to form a circuit socket for connecting to the data acquisition card in the measurement module, the printed circuit board is not smaller than the outer size of the electrode frame, and the surface of the block area and the current collecting area of ​​the printed circuit board is gold-plated;

[0015] Preferably, the current collecting plate has the same outer dimensions as the electrode frame, a pole ear is provided at one end of the current collecting plate, and the pole ear is used to connect the measurement module, and the material composition of the current collecting plate is mainly copper;

[0016] Preferably, the end plate has the same size as the electrode frame, and positioning holes are provided at the four corners of the bipolar plate body, the electrode frame, the current collecting plate and the end plate. The end plate is made of aluminum or PVC or other materials with excellent compression resistance;

[0017] Compared with the prior art, the electrode frame performance testing device based on current density distribution measurement provided by the present invention has the following beneficial effects:

[0018] 1. According to the design of the electrode frame, the electrode frame performance test system was designed and constructed, and high-resolution current density measurement was achieved and analyzed.

[0019] 2. The device is designed to be adaptable to electrode frames of different designs and is universal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the connection relationship of the system structure of the present invention.

[0021] In the figure:

[0022] 11. Battery module; 12. Measurement module; 13. Display module;

[0023] 21. Printed circuit board; 221. First bipolar plate; 222. Second bipolar plate; 23. Electrode frame; 24. Electrode plate; 25. Current collecting plate; 26. End plate. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0026] Example

[0027] Please refer to Figure 1 As shown:

[0028] In order to solve the problems mentioned in the technical solution, the embodiment of the present application provides an electrode frame performance testing device based on current density distribution measurement, including a battery module 11, a measurement module 12 and a display module 13, wherein the battery module 11 includes a liquid flow battery, wherein:

[0029] The liquid flow battery is composed of a printed circuit board 21, a bipolar plate body, an electrode frame 23, an electrode 24, a current collecting plate 25, an end plate 26 and a diaphragm. The bipolar plate body includes a first bipolar plate 221 and a second bipolar plate 222. The printed circuit board 21, the first bipolar plate 221, the second bipolar plate 222, the electrode frame 23, the electrode 24, the current collecting plate 25, and the end plate 26 are symmetrically arranged on both sides of the diaphragm, wherein the first bipolar plate 221 is a block bipolar plate;

[0030] The measuring module 12 includes a charge and discharge tester and a data acquisition card. The charge and discharge tester is connected to the current collecting plate 25 in the battery module 11 through a wire with an alligator clip. The data acquisition card is connected to the display unit through a data line. The data acquisition card is used to collect the voltage signal across each resistor in the printed circuit board 21 and transmit it to the display unit.

[0031] The display module 13 is responsible for recording and analyzing the collected data in real time, and drawing a real-time current density distribution cloud diagram in the electrode frame 23;

[0032] The current density distribution in the flow battery electrode frame 23 is mainly composed of the end plate 26, the current collecting plate 25, the printed circuit board 21, and the divided bipolar plate;

[0033] The block bipolar plate is provided with a block area, and the block bipolar plate is consistent with the outer dimensions of the electrode frame 23. The block area of ​​the block bipolar plate is the active area of ​​the electrode frame 23. The size, number and interval between the blocks of the block bipolar plate are determined by the size of the active area of ​​the electrode frame 23. The block bipolar plate and the electrode frame 23 are both provided with liquid inlets and outlets, and the liquid inlets and outlets of the block bipolar plate are smaller than the liquid inlets and outlets of the electrode frame 23. The side of the block bipolar plate is provided with a threaded hole, and the inlet and outlet pipes are installed in the threaded hole. The thickness of the block bipolar plate should be greater than the diameter of the liquid inlet and outlet of the electrode frame 23.

[0034] The spacing between the blocks in the block area of ​​the block bipolar plate is greater than 0.5 mm and less than 2 mm. The area of ​​a single block in the block bipolar plate accounts for 1 / 100-1 / 36 of the total active area. The area of ​​a single block in the block bipolar plate needs to be determined according to actual conditions. The bipolar plate body material is graphite.

[0035] The block intervals in the block area of ​​the block bipolar plate are uniformly filled with resin, and the blocks are insulated from each other by the resin. A filling groove is opened on the periphery of the block area of ​​the block bipolar plate, and the filling groove is uniformly filled with resin to reduce the influence of lateral current;

[0036] The printed circuit board 21 is also provided with a block area. The block design in the block area of ​​the printed circuit board 21 is smaller than or the same as the block design of the block bipolar plate. Each block of the block bipolar plate is electrically connected to a resistor. A current collecting area is provided on the back of the printed circuit board 21. The block current of the block bipolar plate flows into the resistor through the printed circuit board 21 block, and the current in the resistor flows to the current collecting area. The two ends of the resistor are electrically connected to a voltage output end. The voltage lines at the two ends of the resistor are integrated through the embedded circuit connection of the printed circuit board 21 to form a circuit socket for connecting with the data acquisition card in the measurement module. The printed circuit board 21 is not smaller than the outer dimensions of the electrode frame 23. The surface of the block area and the current collecting area of ​​the printed circuit board 21 is gold-plated;

[0037] The current collecting plate 25 has the same external dimensions as the electrode frame 23. A pole ear is provided at one end of the current collecting plate 25, and the pole ear is used to connect the measuring module 12. The material composition of the current collecting plate 25 is mainly copper.

[0038] The end plate 26 has the same dimensions as the electrode frame 23. Positioning holes are provided at the four corners of the bipolar plate, the electrode frame 23, the current collecting plate 25 and the end plate 26. The end plate 26 is made of aluminum or PVC or other materials with excellent compression resistance.

[0039] The specific implementation steps of the above embodiment are as follows:

[0040] First, the design of each component is completed according to the design of the electrode frame 23;

[0041] Second, follow the above arrangement order and make good use of the positioning holes to complete the construction of the measuring device;

[0042] Third, use bolts to fasten the measuring device and ensure uniform contact between the bipolar plate and the printed circuit board 21, while also ensuring the sealing of the device;

[0043] Fourth, connect the electrolyte flow path and check the tightness to ensure that there is no leakage of air or liquid;

[0044] Fifth, connect the circuit, connect the negative pole of the charge and discharge tester to the current collector 25 on one side of the printed circuit board 21, and the positive pole to the other side. Connect the integrated circuit socket of the printed circuit board 21 to the acquisition card through a data cable, and the acquisition card is connected to the computer;

[0045] Sixth, start the test. Run the designed charging and discharging program, turn on the acquisition switch of the data acquisition card, and record the data during the charging and discharging process in the specified path;

[0046] Seventh, data analysis. Run the data analysis software, which will automatically read the data and visualize the current density distribution at any time during the charge and discharge process. At the same time, the areas that need improvement are analyzed from the cloud map of the current density distribution.

[0047] In summary, the advantage of the device is that the targeted design and construction of the electrode frame 23 performance test system is realized according to the design of the electrode frame 23, and high-resolution current density measurement and analysis are realized. At the same time, the design of the device can be oriented to electrode frames 23 of different designs and has universal applicability.

[0048] Please refer to the above working process Figure 1 .

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrode frame performance testing device based on current density distribution measurement, comprising a battery module (11), a measuring module (12) and a display module (13), characterized in that: The battery module (11) comprises a flow battery, wherein: The liquid flow battery is composed of a printed circuit board (21), a bipolar plate body, an electrode frame (23), an electrode (24), a current collecting plate (25), an end plate (26) and a diaphragm, wherein the printed circuit board (21), the bipolar plate body, the electrode frame (23), the electrode (24), the current collecting plate (25) and the end plate (26) are symmetrically arranged on both sides of the diaphragm; The measuring module (12) mainly comprises a charge and discharge tester and a data acquisition card, wherein the charge and discharge tester is connected to a current collecting plate (25) in a battery module (11) via a wire with an alligator clip, and the data acquisition card is connected to a display unit via a data line, and the data acquisition card is used to collect voltage signals at both ends of each resistor in a printed circuit board (21) and transmit the voltage signals to the display unit; The display module (13) is responsible for recording and analyzing the collected data in real time, and drawing a real-time current density distribution cloud diagram in the electrode frame (23).

2. The electrode frame performance testing device based on current density distribution measurement according to claim 1, characterized in that: The fixture for measuring the current density distribution in the electrode frame (23) of a liquid flow battery mainly consists of an end plate (26), a current collecting plate (25), a printed circuit board (21), and a bipolar plate body.

3. The electrode frame performance testing device based on current density distribution measurement according to claim 2, characterized in that: The bipolar plate body is provided with a block area, the bipolar plate body and the electrode frame (23) have the same external dimensions, the block area of ​​the bipolar plate body is the active area of ​​the electrode frame (23), the size and number of the blocks of the bipolar plate body and the interval between the blocks are determined by the size of the active area of ​​the electrode frame (23), the bipolar plate body and the electrode frame (23) are both provided with liquid inlet and outlet ports, the liquid inlet and outlet ports of the bipolar plate body are smaller than the liquid inlet and outlet ports of the electrode frame (23), a threaded hole is provided on the side of the bipolar plate body, a liquid inlet and outlet pipe is installed in the threaded hole, and the thickness of the bipolar plate body should be greater than the diameter of the liquid inlet and outlet ports of the electrode frame (23).

4. The electrode frame performance testing device based on current density distribution measurement according to claim 3, characterized in that: The spacing between the blocks in the block area of ​​the bipolar plate body is greater than 0.5 mm and less than 2 mm. The area of ​​a single block in the bipolar plate body accounts for between 1 / 100 and 1 / 36 of the total active area. The area of ​​a single block in the bipolar plate body needs to be determined based on actual conditions. The bipolar plate body material is graphite.

5. The electrode frame performance testing device based on current density distribution measurement according to claim 1, characterized in that: The block intervals in the block area of ​​the bipolar plate body are uniformly filled with resin, and the blocks are insulated from each other by the resin. A filling groove is opened around the block area of ​​the bipolar plate body, and the filling groove is uniformly filled with resin to reduce the impact of lateral current.

6. The electrode frame performance testing device based on current density distribution measurement according to claim 1, characterized in that: The printed circuit board (21) is also provided with a block area. The block design in the block area of ​​the printed circuit board (21) is smaller than or the same as the bipolar plate block design. Each block of the bipolar plate is electrically connected to a resistor. A current collecting area is provided on the back of the printed circuit board (21). The current of the bipolar plate block flows into the resistor through the printed circuit board (21) block, and the current in the resistor flows to the current collecting area. The two ends of the resistor are electrically connected to a voltage output end. The voltage lines at the two ends of the resistor are integrated through the embedded circuit connection of the printed circuit board (21) to form a circuit socket for connecting to a data acquisition card in a measurement module. The printed circuit board (21) is not smaller than the outer dimensions of the electrode frame (23). The surface of the block area and the current collecting area of ​​the printed circuit board (21) is gold plated.

7. The electrode frame performance testing device based on current density distribution measurement according to claim 1, characterized in that: The current collecting plate (25) has the same external dimensions as the electrode frame (23); a pole ear is provided at one end of the current collecting plate (25), and the pole ear is used to connect the measurement module (12); and the material composition of the current collecting plate (25) is mainly copper.

8. The electrode frame performance testing device based on current density distribution measurement according to claim 1, characterized in that: The end plate (26) has the same external dimensions as the electrode frame (23); positioning holes are provided at the four corners of the bipolar plate body, the electrode frame (23), the current collecting plate (25) and the end plate (26); and the end plate (26) is made of a material having excellent pressure resistance, such as aluminum or PVC.

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