CN219715602U - High interference resistance's electrochemical impedance spectrum testing arrangement for hydrogen energy - Google Patents
High interference resistance's electrochemical impedance spectrum testing arrangement for hydrogen energy Download PDFInfo
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- CN219715602U CN219715602U CN202321333751.6U CN202321333751U CN219715602U CN 219715602 U CN219715602 U CN 219715602U CN 202321333751 U CN202321333751 U CN 202321333751U CN 219715602 U CN219715602 U CN 219715602U
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- fuel cell
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- current load
- cell stack
- hydrogen energy
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- 238000012360 testing method Methods 0.000 title claims abstract description 23
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 239000001257 hydrogen Substances 0.000 title claims abstract description 18
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 18
- 238000001453 impedance spectrum Methods 0.000 title claims abstract description 16
- 239000000446 fuel Substances 0.000 claims abstract description 64
- 230000003750 conditioning effect Effects 0.000 claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims description 18
- 238000000157 electrochemical-induced impedance spectroscopy Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Fuel Cell (AREA)
Abstract
An electrochemical impedance spectrum testing device with high anti-interference capability for hydrogen energy belongs to the technical field of hydrogen energy testing, and solves the problem that the electrochemical impedance spectrum of a fuel cell stack or a single fuel cell cannot be accurately measured in the prior art; the conditioning circuit is connected in series into a loop formed by the direct current load and the fuel cell stack or the single fuel cell, and the loop is subjected to current filtering, so that the disturbance degree of the alternating current load received by the fuel cell stack or the single fuel cell is improved, the effect of higher impedance detection precision is achieved, and high-precision impedance detection is realized; the direct current load is adopted as a consumption type electronic load with high current load pulling capacity, and the current and power disturbance capacity can be infinitely improved theoretically through a load parallel operation mode so as to meet the impedance detection capacity of the current maximum MW level electric pile; by adopting the high-precision data acquisition device, voltage fluctuation of mu V level can be resolved, and the detection precision is further improved.
Description
Technical Field
The utility model belongs to the technical field of hydrogen energy testing, and relates to an electrochemical impedance spectrum testing device with high anti-interference capability for hydrogen energy.
Background
The hydrogen energy has the advantages of cleanness, high efficiency, regeneration and the like. The hydrogen production by water electrolysis can be matched with the seasonal and fluctuation characteristics of new energy power generation, and the electric quantity of the power grid in the electricity trough can be consumed, so that the energy utilization rate is improved; the fuel cell has the functions similar to the traditional internal combustion engine, overcomes the defects of long lithium battery charging time, weak low-temperature discharging capacity and the like, and has the prospect of large-scale application in the fields of commercial vehicles and passenger vehicles, distributed power generation, portable power sources, ships, aerospace and the like.
At present, in the field of hydrogen energy, the technology of a galvanic pile comprises a fuel cell galvanic pile and an electrolytic water galvanic pile, and the performance of the galvanic pile is improved by 300 percent compared with that of the galvanic pile before ten years, the power of the galvanic pile is improved by 600 percent, the durability and the cost are greatly improved, and the galvanic pile has the capability of primary commercialization.
In the development process of the galvanic pile, the state of the galvanic pile is inevitably required to be monitored and evaluated so as to evaluate the rationality of indexes such as materials, structures, seal matching and the like, and further optimize the design. The electrochemical impedance spectrum is the core of the pile diagnosis, and the pile is applied with alternating current excitation with certain amplitude and different frequencies, and meanwhile voltage information of the pile, the sheet group and the single sheet is collected, so that impedance information of each part is analyzed, and the conduction conditions of electronic conduction, water and gas in the pile are evaluated, so that the detection purpose is achieved.
However, with the rise of the power of the pile, the feedback type electronic load or the direct current power supply has strong interference on the impedance detection during the impedance test, so that only a small part of the pulling information of the alternating current load reaches the pile, and the pile has small voltage change when receiving current excitation with small amplitude, thus the impedance information cannot be accurately extracted.
Disclosure of Invention
The utility model aims to design an electrochemical impedance spectrum testing device with high anti-interference capability for hydrogen energy so as to solve the problem that the electrochemical impedance spectrum of a fuel cell stack or a single fuel cell cannot be accurately measured in the prior art.
The utility model solves the technical problems through the following technical scheme:
an electrochemical impedance spectrum testing device for hydrogen energy with high anti-interference capability, comprising: direct current load, alternating current load, data acquisition device, conditioning circuit; the direct current load is connected with the fuel cell stack or the single fuel cell in series to form a loop, and the direct current load pulls the fuel cell stack or the single fuel cell; the conditioning circuit is connected in series with a direct current load and a fuel cell stack or a single fuel cell to form a loop; the alternating current load is used as a disturbance source and connected to two ends of the fuel cell stack or the single fuel cell, the data acquisition device is connected to two ends of the fuel cell stack or the single fuel cell, and voltage and current data of the two ends of the fuel cell stack or the single fuel cell are acquired as the basis of electrochemical impedance spectrum calculation.
The conditioning circuit comprises: resistor R1, resistor R2, resistor R3, capacitor C1, capacitor C2, and operational amplifier U1; the resistor R1 is connected with the resistor R3 in series, the non-serial end of the resistor R1 is used as the input end of the conditioning circuit to be connected with the output end of the direct current load, the non-serial end of the resistor R3 is connected with the inverting input end of the operational amplifier U1, the serial common point of the resistor R1 and the resistor R3 is connected with one end of the capacitor C1, the other end of the capacitor C1 is grounded, one end of the resistor R2 is connected with the serial common point of the resistor R1 and the resistor R3, the other end of the resistor R2 is connected with the output end of the operational amplifier U1, the output end of the operational amplifier U1 is connected with the fuel cell stack or the monolithic fuel cell, one end of the capacitor C2 is connected with the inverting input end of the operational amplifier U1, and one end of the capacitor C2 is connected with the output end of the operational amplifier U1.
The utility model has the advantages that:
(1) The electrochemical impedance spectrum testing device for the hydrogen energy is designed to connect the conditioning circuit in series into a loop formed by the direct current load and the fuel cell stack or the single fuel cell, filter the loop, and improve the disturbance degree of the alternating current load received by the fuel cell stack or the single fuel cell, thereby achieving the effect of higher impedance detection precision and realizing high-precision detection of impedance;
(2) The electrochemical impedance spectrum testing device for hydrogen energy, which is designed by the utility model, adopts a direct current load as a consumption type electronic load with high current load pulling capacity, and the current and power disturbance capacity can be infinitely improved theoretically in a load parallel operation mode so as to meet the current impedance detection capacity of the maximum MW-level galvanic pile.
(3) The electrochemical impedance spectrum testing device for hydrogen energy, which is designed by the utility model, adopts a high-precision data acquisition device, can distinguish voltage fluctuation of mu V level, and can acquire current and voltage information with higher precision even under the condition of strong power supply or load interference.
Drawings
FIG. 1 is a schematic diagram of a high anti-interference device for testing electrochemical impedance spectrum of hydrogen energy according to an embodiment of the present utility model;
FIG. 2 is a schematic circuit diagram of a conditioning circuit according to a second embodiment of the present utility model;
FIG. 3 is a graph showing the test results of a fuel cell stack before and after the addition of conditioning circuitry;
fig. 4 is a graph of test results for a monolithic fuel cell before and after addition of conditioning circuitry.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described in the following in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The technical scheme of the utility model is further described below with reference to the attached drawings and specific embodiments:
example 1
As shown in fig. 1, the electrochemical impedance spectrum testing apparatus for hydrogen energy with high anti-interference capability of the present embodiment, which is used for testing a fuel cell stack 10 or a monolithic fuel cell, includes: a direct current load 11, an alternating current load 12, a data acquisition device 13 and a conditioning circuit 14.
The direct current load 11 forms a loop with the fuel cell stack 10 through a conditioning circuit 14 connected in series at the front end of the direct current load 11, and the direct current load 11 carries out load pulling on the fuel cell stack 10 or a single fuel cell; the alternating current load 12 is used as a disturbance source and connected to two ends of the fuel cell stack 10 or the single fuel cell, and the data acquisition device 13 is connected to two ends of the fuel cell stack 10 or the single fuel cell and used for acquiring voltage and current data of two ends of the fuel cell stack 10 or the single fuel cell as the basis of impedance calculation.
The conditioning circuit 14 is used for enabling the direct current load 11 to receive stable current, and guaranteeing that the direct current load 11 does not generate obvious current fluctuation due to disturbance of the alternating current load 12, so that alternating current of the alternating current load 12 can enter the fuel cell stack 10 or the single-chip fuel cell to the maximum extent, voltage fluctuation of the fuel cell stack 10 or the single-chip fuel cell is caused, and the aim of accurately detecting impedance is achieved; the conditioning circuit is integrated inside the testing device and can significantly reduce the impact of the load or power supply on the impedance test.
As shown in fig. 2, the conditioning circuit 14 includes: resistor R1, resistor R2, resistor R3, capacitor C1, capacitor C2, and operational amplifier U1; the resistor R1 is connected with the resistor R3 in series, the non-serial end of the resistor R1 is used as the input end of the conditioning circuit 14 to be connected with the output end of the direct current load 11, the non-serial end of the resistor R3 is connected with the inverting input end of the operational amplifier U1, the serial common point of the resistor R1 and the resistor R3 is connected with one end of the capacitor C1, the other end of the capacitor C1 is grounded, one end of the resistor R2 is connected with the serial common point of the resistor R1 and the resistor R3, the other end of the resistor R2 is connected with the output end of the operational amplifier U1, the output end of the operational amplifier U1 is connected with the fuel cell stack 10 or the single-chip fuel cell, one end of the capacitor C2 is connected with the inverting input end of the operational amplifier U1, one end of the capacitor C2 is connected with the output end of the operational amplifier U1, and the model of the operational amplifier U1 is LTC6261.
Fig. 3 is a graph showing the test results of a fuel cell stack of the present utility model before and after the addition of a conditioning circuit, from which it can be seen that the impedance detection is slightly different after the addition of the conditioning circuit, wherein in the high frequency region, a distinct inductive characteristic appears after the addition of the conditioning circuit. For the fuel cell stack detection, the information fed back by the high-frequency information is less, on one hand, the enhancement of the inductive characteristic does not influence the detection of the impedance of the fuel cell stack, and on the other hand, the high-frequency internal resistance can be more easily distinguished. In the middle-low frequency region, the polarization semicircle shape is similar, but mass transfer at low frequency is slightly different due to the different water contents in the fuel cell stack in the detection process.
Fig. 4 shows a graph of the test results of the monolithic fuel cell before and after the conditioning circuit is added, and it can be seen from the graph that the monolithic fuel cell information cannot be accurately extracted due to the interference of the dc load before the conditioning circuit is added, and the overall high frequency region shows a tendency of random points. However, after the conditioning circuit is added, the information of the single fuel cell can be accurately extracted, and in the middle-low frequency area, on one hand, the interference of the direct current load is smaller, and on the other hand, the information of the low frequency area is easier to extract, so that the shapes are not obviously different before and after the conditioning circuit is added.
The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (2)
1. An electrochemical impedance spectrum testing device for hydrogen energy with high anti-interference capability, which is characterized by comprising: a direct current load (11), an alternating current load (12), a data acquisition device (13) and a conditioning circuit (14); the direct current load (11) is connected with a fuel cell stack or a single fuel cell in series to form a loop; the conditioning circuit (14) is connected in series to the direct current load (11) and the fuel cell stack or the single fuel cell to form a loop; the alternating current load (12) is used as a disturbance source to be connected to two ends of the fuel cell stack or the single fuel cell, and the data acquisition device (13) is connected to two ends of the fuel cell stack or the single fuel cell.
2. The high interference rejection electrochemical impedance spectroscopy test apparatus for hydrogen energy of claim 1 wherein said conditioning circuit (14) comprises: resistor R1, resistor R2, resistor R3, capacitor C1, capacitor C2, and operational amplifier U1; the resistor R1 is connected with the resistor R3 in series, the non-series end of the resistor R1 is used as the input end of the conditioning circuit (14) to be connected with the output end of the direct current load (11), the non-series end of the resistor R3 is connected with the inverting input end of the operational amplifier U1, the series common point of the resistor R1 and the resistor R3 is connected with one end of the capacitor C1, the other end of the capacitor C1 is grounded, one end of the resistor R2 is connected with the series common point of the resistor R1 and the resistor R3, the other end of the resistor R2 is connected with the output end of the operational amplifier U1, the output end of the operational amplifier U1 is connected with the fuel cell stack or the monolithic fuel cell, one end of the capacitor C2 is connected with the inverting input end of the operational amplifier U1, and one end of the capacitor C2 is connected with the output end of the operational amplifier U1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321333751.6U CN219715602U (en) | 2023-05-29 | 2023-05-29 | High interference resistance's electrochemical impedance spectrum testing arrangement for hydrogen energy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321333751.6U CN219715602U (en) | 2023-05-29 | 2023-05-29 | High interference resistance's electrochemical impedance spectrum testing arrangement for hydrogen energy |
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| Publication Number | Publication Date |
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| CN219715602U true CN219715602U (en) | 2023-09-19 |
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| CN202321333751.6U Active CN219715602U (en) | 2023-05-29 | 2023-05-29 | High interference resistance's electrochemical impedance spectrum testing arrangement for hydrogen energy |
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| Country | Link |
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| CN (1) | CN219715602U (en) |
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2023
- 2023-05-29 CN CN202321333751.6U patent/CN219715602U/en active Active
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