CN114512695A - Method for estimating design consistency of galvanic pile - Google Patents
Method for estimating design consistency of galvanic pile Download PDFInfo
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- CN114512695A CN114512695A CN202111610359.7A CN202111610359A CN114512695A CN 114512695 A CN114512695 A CN 114512695A CN 202111610359 A CN202111610359 A CN 202111610359A CN 114512695 A CN114512695 A CN 114512695A
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- 238000013461 design Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000012528 membrane Substances 0.000 claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 claims abstract description 38
- 238000007689 inspection Methods 0.000 claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 230000006866 deterioration Effects 0.000 claims abstract description 11
- 230000010287 polarization Effects 0.000 claims abstract description 8
- 230000003213 activating effect Effects 0.000 claims abstract description 3
- 238000012545 processing Methods 0.000 claims description 4
- 239000000446 fuel Substances 0.000 abstract description 11
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000012938 design process Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 238000012805 post-processing Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04858—Electric variables
- H01M8/04865—Voltage
- H01M8/04873—Voltage of the individual fuel cell
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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
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04992—Processes for controlling fuel cells or fuel cell systems characterised by the implementation of mathematical or computational algorithms, e.g. feedback control loops, fuzzy logic, neural networks or artificial intelligence
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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
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/2404—Processes or apparatus for grouping fuel cells
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Abstract
The invention discloses a method for estimating the consistency of a stack design, which relates to the technical field of fuel cells; the problem that the detection process is complicated is solved; the method specifically comprises the following steps: fully activating the membrane electrode assembly galvanic pile according to a standard flow, and then testing a polarization curve to obtain voltage inspection information under the operating current; grouping the voltage inspection information of a single section in the galvanic pile; estimating the consistency deterioration caused by the membrane electrode manufacturing process according to the obtained voltage grouping information; calculating the consistency caused by the design structure of the galvanic pile according to the calculated manufacturing consistency variation; the environment temperature of the test is 40-65 ℃; the specific operation of assembling the membrane electrode into the galvanic pile is as follows: the membrane electrode and bipolar plate stack assembly was assembled into a stack according to the design configuration. The invention calculates the design-induced non-uniformity according to the calculated manufacturing uniformity variation, thereby accurately evaluating the value of the uniformity caused by the stack design structure.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a method for estimating the design consistency of a galvanic pile.
Background
At present, the power of the proton exchange membrane fuel cell stack for vehicles is generally about 100kW, and the proton exchange membrane fuel cell stack usually consists of 300-500 membrane electrodes and bipolar plates, and the key point influencing the output performance lies in the consistency of the stack. The consistency of the stack generally refers to the divergence state of the voltage of a single sheet under the operation current, and if the uniformity of the voltage of the single sheet is good, the higher the limiting current is. However, in the operation process of the stack, the variation affecting the uniformity of the stack is usually determined by two main factors, one is caused by the unreasonable design structure of the stack, and because the stack is a multi-section series structure and air is fed, the temperature, pressure and flow rate of each single sheet have slight difference, which can cause the voltages of the single sheets of the stack to be different. Meanwhile, the membrane electrode causes differences in the manufacturing, transporting and assembling processes, so that voltage differences still exist under the same operating conditions.
Through retrieval, the Chinese patent with the application number of CN201410779579.6 discloses a method for detecting the fluid distribution consistency of a proton exchange membrane fuel cell stack, wherein the proton exchange membrane fuel cell stack consists of more than 2 single cells which are stacked in sequence; the proton exchange membrane fuel cell stack comprises an anode inlet and a cathode inlet, mixed gas of hydrogen and inert gas is introduced into the anode inlet or the cathode inlet of the proton exchange membrane fuel cell stack, and the same voltage for hydrogen oxidation is applied between the two electrodes of each single cell of the proton exchange membrane fuel cell stack. The method for detecting the fluid distribution consistency of the proton exchange membrane fuel cell stack in the patent has the following defects: the detection process is complicated, and the operating conditions of each battery in the electric pile can not be ensured to be consistent.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a method for estimating the design consistency of a stack.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of estimating stack design uniformity, comprising the steps of:
s1: fully activating the membrane electrode assembly galvanic pile according to a standard flow, and then testing a polarization curve to obtain voltage inspection information under the operating current;
s2: grouping the voltage inspection information of a single section in the galvanic pile;
s3: estimating the consistency deterioration caused by the membrane electrode manufacturing process according to the obtained voltage grouping information;
s4: calculating the consistency caused by the design structure of the galvanic pile according to the calculated manufacturing consistency variation;
the environment temperature of the test is 40-65 ℃;
the specific operation of assembling the membrane electrode into the galvanic pile is as follows: the membrane electrode and bipolar plate stack assembly was assembled into a stack according to the design configuration.
Preferably: the operating current is the rated current I of the galvanic pile, and the rated current I is 100-800A.
Preferably: the voltage patrol information includes V1，V2，V3……Vk-2，Vk-1，Vk，VjThe voltage information of the j-th section in the electric pile, k is the number of the electric pile sections, and the number of the electric pile sections is between 60 and 600.
Preferably: after the operation of obtaining the voltage inspection information under the operating current, the method further comprises the step of calculating the integral electric pile consistency sigma according to the voltage inspection information, wherein the calculation formula of the integral electric pile consistency sigma is as follows:
preferably: grouping the voltage inspection information of a single section in the galvanic pile, and specifically operating as follows: dividing the voltage inspection information of the membrane electrode into n groups, wherein each group of voltage information is described as follows:
group 1: u shape1＝[V1，V2……Vi-1，Vi]
Group 2: u shape2＝[Vi+1，Vi+2……V2i-1，V2i]
……
Group n-1: u shapen＝[V(n-2)i+1，V(n-2)i+2……V(n-1)i-1，V(n-1)i]
Group n: u shapen＝[V(n-1)i+1，V(n-1)i+2……Vni-1，Vni]
i is an integer between 3 and 20, n is an integer between 10 and 100, and n x i is ensured to be approximately equal to k.
Preferably: the consistency deterioration caused by the membrane electrode manufacturing process is calculated according to the obtained voltage grouping information, and the method specifically comprises the following steps:
a1: firstly, calculating the mean square error of the voltage in each voltage group;
a2: the manufacturing variation of the membrane electrode was estimated from the mean square error of each voltage packet.
Preferably: the calculation formula of the mean square error of the voltage in each voltage group is as follows:
preferably: the calculation formula of the manufacturing variation of the membrane electrode is as follows:
preferably: the consistency caused by the design structure of the galvanic pile is calculated according to the following formula:
the invention has the beneficial effects that:
1. according to the invention, after adjacent voltage information is grouped, the manufacturing uniformity variation of the membrane electrode is calculated, and the nonuniformity caused by design is calculated according to the calculated manufacturing uniformity variation, so that the value of the uniformity caused by the design structure of the stack is accurately evaluated, and the calculation is accurate, simple and effective.
2. According to the invention, the membrane electrode, the bipolar plate and other galvanic pile components are assembled into the galvanic pile according to the design structure, the polarization curve test is carried out after full activation is carried out according to the standard flow, the voltage patrol information under the rated current of the galvanic pile is obtained, then the integral consistency of the galvanic pile is calculated, the voltage patrol information of the single battery is subjected to grouping processing, the manufacturing consistency variation of the membrane electrode is estimated after the mean square difference of the voltage in each voltage grouping is calculated, finally, the consistency caused by the design structure of the galvanic pile is calculated according to the calculated manufacturing consistency variation without adding extra equipment and cost, only a data post-processing link is added in the development and test process, and the operation is simple.
3. The invention separates the consistency caused by the design process and the manufacturing process, can effectively remove the consistency of the galvanic pile caused by the membrane electrode manufacturing process, and is convenient for the quick iteration of the design optimization.
Drawings
FIG. 1 is a schematic flow chart of a method for estimating consistency of stack design according to the present invention;
fig. 2 is a schematic diagram of a monolithic voltage inspection of a stack according to the method for estimating the design consistency of the stack.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
Example 1:
a method of estimating stack design uniformity, as shown in fig. 1-2, comprising the steps of:
s1: after the membrane electrode assembly galvanic pile is fully activated according to a standard flow, a polarization curve test is carried out to ensure the stable performance of each cell and obtain the voltage routing inspection information under the operation current;
s2: grouping the voltage inspection information of a single section in the galvanic pile;
s3: estimating the consistency deterioration caused by the membrane electrode manufacturing process according to the obtained voltage grouping information;
s4: and calculating the consistency caused by the design structure of the galvanic pile according to the calculated manufacturing consistency deterioration.
The specific operation of assembling the membrane electrode into the stack in the step S1 is as follows: and assembling the membrane electrode, the bipolar plate and other galvanic pile components into a galvanic pile according to a design structure.
Preferably, the ambient temperature of the test is 40 ℃ to 65 ℃.
The operating current is the rated current I of the galvanic pile, and the rated current I can be 100-800A;
preferably, the voltage patrol information includes V1，V2，V3……Vk-2，Vk-1，Vk；
Wherein, VjThe voltage information of the j-th section in the electric pile, k is the number of the electric pile sections, and the number of the electric pile sections can be between 60 and 600.
In the step S2, the voltage inspection information of the single cell in the stack is processed in groups, and the specific operation is to divide the voltage inspection information of the membrane electrode into n groups, where each group of voltage information is described as follows:
group 1: u shape1＝[V1，V2……Vi-1，Vi]
Group 2: u shape2＝[Vi+1，Vi+2……V2i-1，V2i]
……
Group n-1: u shapen＝[V(n-2)i+1，V(n-2)i+2……V(n-1)i-1，V(n-1)i]
Group n: u shapen＝[V(n-1)i+1，V(n-1)i+2……Vni-1，Vni]
Wherein i is the number of voltage information contained in each group and can be an integer between 3 and 20, n is the number of groups of the whole electric pile and can be an integer between 10 and 100, and n x i is required to be approximately equal to k.
In S3, the method calculates the consistency deterioration caused by the membrane electrode manufacturing process according to the obtained voltage grouping information, and specifically includes the following steps:
a1: firstly, calculating the mean square error of the voltage in each voltage group;
a2: the manufacturing variation of the membrane electrode was estimated from the mean square error of each voltage packet.
Preferably, the calculation formula of the mean square error of the voltages in each voltage group is as follows:
preferably, the calculation formula of the manufacturing variation of the membrane electrode is as follows:
wherein sigmanIs the mean square error, σ, of the nth set of voltage informationmIs the deterioration caused by the manufacturing process of the membrane electrode in the whole stack.
In S4, consistency caused by the stack design structure is calculated, and the calculation formula is as follows:
wherein σdFor design consistency due to stack structure design, σ is the mean square error of the voltage trimmed by the stack, σmIs the deterioration caused by the manufacturing process of the membrane electrode in the whole stack.
When the device is used, the membrane electrode, the bipolar plate and other stack components are assembled into a stack according to a design structure, the stack components are fully activated according to a standard process and then subjected to polarization curve test to obtain voltage inspection information of the stack under a rated current, then the voltage inspection information of the single battery is subjected to grouping processing, the manufacturing consistency variation of the membrane electrode is estimated after the mean square difference of voltages in each voltage group is calculated, and finally the consistency caused by the design structure of the stack is calculated according to the calculated manufacturing consistency variation.
The method can effectively remove the consistency of the galvanic pile caused by the manufacturing process of the membrane electrode, and further accurately evaluate the consistency value caused by the design structure of the galvanic pile; extra equipment and cost are not required to be added, only a data post-processing link is added in the development and test process, and the operation is simple; the consistency caused by the design process and the manufacturing process can be separated, and the consistency caused by the design structure of the galvanic pile is calculated according to the calculated manufacturing consistency deterioration, so that the quick iteration of the design optimization is facilitated.
Example 2:
a method of estimating stack design uniformity, as shown in fig. 1-2, in order to obtain overall stack uniformity; this example is supplemented by example 1 with the following: and the step S1 further comprises the step of calculating the integral stack consistency sigma according to the voltage patrol inspection information, wherein the calculation formula of the integral stack consistency sigma is as follows:
wherein the content of the first and second substances,
is the average cell voltage of the stack.
When the device is used, stack assemblies such as a membrane electrode and a bipolar plate are assembled into a stack according to a design structure, the stack assemblies are fully activated according to a standard process and then subjected to polarization curve test to obtain voltage routing inspection information under the rated current of the stack, the overall consistency of the stack is calculated, the voltage routing inspection information of a single battery is subjected to grouping processing, the manufacturing consistency variation of the membrane electrode is estimated after the mean square difference of the voltage in each voltage group is calculated, and finally the consistency caused by the design structure of the stack is calculated according to the calculated manufacturing consistency variation.
The method can effectively remove the consistency of the galvanic pile caused by the manufacturing process of the membrane electrode, and further accurately evaluate the consistency value caused by the design structure of the galvanic pile; extra equipment and cost are not required to be added, only a data post-processing link is added in the development and test process, and the operation is simple; the consistency caused by the whole consistency of the galvanic pile test, the design process and the manufacturing process can be separated, and the consistency caused by the galvanic pile design structure is calculated according to the calculated manufacturing consistency variation, so that the quick iteration of the design optimization is facilitated.
Application example:
300 membrane electrodes are assembled into a fuel cell stack with 300 sections, and a polarization curve is tested after activation by adopting a standard process to obtain 1.0A/cm2And calculating the mean square error of the galvanic pile to be 9.5mV according to the voltage polling information of the galvanic pile, dividing the voltage information into 30 groups according to a mode that 10 cells are divided into one group, firstly calculating the mean square error of the voltage of each group, secondly averaging the mean square error to obtain the manufacturing variation of the membrane electrode to be 4.3mV, and calculating the design consistency of the galvanic pile to be 8.5mV according to a formula.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A method of estimating stack design uniformity, comprising the steps of:
s1: fully activating the membrane electrode assembly galvanic pile according to a standard flow, and then testing a polarization curve to obtain voltage inspection information under the operating current;
s2: grouping the voltage inspection information of a single section in the galvanic pile;
s3: estimating the consistency deterioration caused by the membrane electrode manufacturing process according to the obtained voltage grouping information;
s4: calculating the consistency caused by the design structure of the galvanic pile according to the calculated manufacturing consistency variation;
the environment temperature of the test is 40-65 ℃;
the specific operation of assembling the membrane electrode into the galvanic pile is as follows: the membrane electrode and bipolar plate stack assembly was assembled into a stack according to the design configuration.
2. The method for estimating stack design uniformity according to claim 1, wherein said operating current is a rated current I of the stack, and the rated current I is between 100-800A.
3. The method of claim 2, wherein the voltage patrol information comprises V1，V2，V3……Vk-2，Vk-1，Vk，VjThe j is the voltage information of the j section in the electric pile, k is the electric pile section number, and the electric pile section number is between 60 and 600.
4. The method for estimating stack design uniformity according to claim 3, wherein after the operation of obtaining the voltage patrol information under the operating current, the method further comprises calculating the overall stack uniformity σ according to the voltage patrol information, wherein the overall stack uniformity σ is calculated by the following formula:
5. the method for estimating the design consistency of the electric pile according to claim 1, wherein the grouping processing of the voltage patrol inspection information of the single section in the electric pile is specifically performed by: dividing the voltage inspection information of the membrane electrode into n groups, wherein each group of voltage information is described as follows:
group 1: u shape1＝[V1，V2……Vi-1，Vi]
Group 2: u shape2＝[Vi+1，Vi+2……V2i-1，V2i]
……
Group n-1: u shapen＝[V(n-2)i+1，V(n-2)i+2……V(n-1)i-1，V(n-1)i]
Group n: u shapen＝[V(n-1)i+1，V(n-1)i+2……Vni-1，Vni]
i is an integer between 3 and 20, n is an integer between 10 and 100, and n x i is ensured to be approximately equal to k.
6. The method for estimating consistency of stack design according to claim 5, wherein the step of calculating the consistency deterioration caused by the membrane electrode manufacturing process according to the obtained voltage grouping information comprises the following steps:
a1: firstly, calculating the mean square error of the voltage in each voltage group;
a2: the manufacturing variation of the membrane electrode was estimated from the mean square error of each voltage packet.
7. The method of claim 6, wherein the mean square error of the voltage in each voltage group is calculated as follows:
8. the method of estimating stack design uniformity according to claim 7, wherein said manufacturing variation of membrane electrode is calculated by the following formula:
9. the method for estimating stack design uniformity according to claim 8, wherein said calculating stack design structure-induced uniformity is calculated by the following formula:
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|---|---|---|---|---|
| CN114976143A (en) * | 2022-06-29 | 2022-08-30 | 北京亿华通科技股份有限公司 | Fuel cell system control method, apparatus, electronic device, and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114976143A (en) * | 2022-06-29 | 2022-08-30 | 北京亿华通科技股份有限公司 | Fuel cell system control method, apparatus, electronic device, and storage medium |
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