CN109270150B - Method and device for representing capacity ratio of aluminum electrolytic capacitor - Google Patents
Method and device for representing capacity ratio of aluminum electrolytic capacitor Download PDFInfo
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- 239000003990 capacitor Substances 0.000 title claims abstract description 208
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 204
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 204
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000003792 electrolyte Substances 0.000 claims abstract description 201
- 239000008151 electrolyte solution Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 238000005457 optimization Methods 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 8
- 239000010407 anodic oxide Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 238000005470 impregnation Methods 0.000 claims description 6
- 238000012512 characterization method Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 18
- 238000012827 research and development Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000000523 sample Substances 0.000 description 5
- 208000019206 urinary tract infection Diseases 0.000 description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
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Abstract
The embodiment of the invention discloses a method and a device for representing the capacity ratio of an aluminum electrolytic capacitor. The method comprises the following steps: determining the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor according to the conductivity at a plurality of temperatures and the capacity ratio at a plurality of temperatures; and acquiring the conductivity of the optimized electrolyte at a preset temperature, and calculating the capacity ratio of the aluminum electrolytic capacitor using the optimized electrolyte according to the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor, wherein the preset temperature is within a set temperature range. According to the technical scheme provided by the embodiment of the invention, the capacity ratio of the aluminum electrolytic capacitor using the optimized electrolyte can be calculated by utilizing the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor and the conductivity of the optimized electrolyte, so that the steps of preparing the aluminum electrolytic capacitor by using the optimized electrolyte and testing the capacity ratio of the aluminum electrolytic capacitor are omitted, the research and development period is shortened, and the research and development efficiency is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of capacitors, in particular to a method and a device for representing the capacity ratio of an aluminum electrolytic capacitor.
Background
The electrolyte is a working cathode of the aluminum electrolytic capacitor, and parameters such as the application temperature range, the service life, the working voltage, the physical and chemical properties and the like of the electrolyte determine the application condition and the working environment of the aluminum electrolytic capacitor and are also key factors for improving the quality of the aluminum electrolytic capacitor. Therefore, in the development process of the conventional aluminum electrolytic capacitor, the performance of the aluminum electrolytic capacitor is optimized mainly by optimizing the electrolyte.
In the development process of the wide-temperature aluminum electrolytic capacitor, whether the optimized electrolyte has the optimization effect can be judged by preparing an aluminum electrolytic capacitor sample and further testing the electrical parameters of the aluminum electrolytic capacitor at different temperatures.
However, the process from the preparation of the aluminum electrolytic capacitor to the completion of the test takes a long time, resulting in inefficient development.
Disclosure of Invention
The embodiment of the invention provides a method for representing the capacity ratio of an aluminum electrolytic capacitor, which aims to solve the problem that whether the optimized electrolyte has the optimization effect can be judged only by using the optimized electrolyte to prepare the aluminum electrolytic capacitor and testing the capacity ratio of the aluminum electrolytic capacitor.
In a first aspect, an embodiment of the present invention provides a method for characterizing a capacity ratio of an aluminum electrolytic capacitor, where the method includes: acquiring the conductivity of the electrolyte of the aluminum electrolytic capacitor at a plurality of temperatures within a set temperature range; obtaining the capacity ratio of the aluminum electrolytic capacitor using the electrolyte at a plurality of temperatures; determining the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor according to the conductivity at a plurality of temperatures and the capacity ratio at a plurality of temperatures; and obtaining the conductivity of the optimized electrolyte at a preset temperature, and calculating the capacity ratio of the aluminum electrolytic capacitor using the optimized electrolyte according to the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor, wherein the preset temperature is within a set temperature range.
Further, the temperature range is set to be-55 ℃ to-20 ℃.
Further, determining the corresponding relationship between the capacity ratio and the conductivity of the aluminum electrolytic capacitor according to the conductivity at the plurality of temperatures and the capacity ratio at the plurality of temperatures comprises: according to the conductivity at a plurality of temperatures and the capacity ratio at a plurality of temperatures
Performing quadratic curve fitting to determine the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor; wherein,
C x℃ * Showing the capacity ratio of the aluminum electrolytic capacitor using the electrolyte at a temperature of x deg.C, C showing the capacity of the anodic oxide film of the aluminum electrolytic capacitor, omega showing the angular frequency of the voltage applied across the aluminum electrolytic capacitor, C Paper Represents the capacitance, r, of the electrolytic paper impregnated with the electrolyte Liquid for treating urinary tract infection Showing the series resistance of the electrolytic paper impregnated with the electrolyte, P showing the resistivity of the electrolytic paper after impregnation with the electrolyte, L showing the thickness of the electrolytic paper, S showing the area of the electrolytic paper,
the equivalent coefficient of the conductivity of the electrolyte and the resistivity of the electrolytic paper impregnated with the electrolyte is shown, sigma represents the conductivity of the electrolyte, C 20℃ The capacity of an aluminum electrolytic capacitor using the electrolyte at a temperature of 20 ℃ is shown.
Further, obtaining the capacity ratio of the aluminum electrolytic capacitor using the electrolyte at a plurality of temperatures comprises obtaining the capacity of the aluminum electrolytic capacitor using the electrolyte at a plurality of temperatures; according to
Determining the capacity ratio of the aluminum electrolytic capacitor using the electrolyte at a plurality of temperatures;
wherein, C x℃ * Showing the capacity ratio at a temperature of x ℃ of an aluminum electrolytic capacitor using the electrolyte, C x℃ Showing the capacitance at a temperature of x ℃ of an aluminum electrolytic capacitor using the electrolyte, C 20℃ The capacity of an aluminum electrolytic capacitor using the electrolyte at a temperature of 20 ℃ is shown.
Further, before obtaining the conductivity of the optimized electrolyte at a preset temperature and calculating the capacity ratio of the aluminum electrolytic capacitor using the optimized electrolyte according to the corresponding relationship between the capacity ratio and the conductivity of the aluminum electrolytic capacitor, the method further includes: and obtaining the optimized electrolyte by changing the mass ratio of the main solute of the electrolyte and/or changing the solvent composition of the electrolyte.
In a second aspect, an embodiment of the present invention further provides an aluminum electrolytic capacitor characterization apparatus, where the apparatus includes: the conductivity acquisition module is used for acquiring the conductivity of the electrolyte of the aluminum electrolytic capacitor at a plurality of temperatures within a set temperature range; the capacity ratio acquisition module is used for acquiring the capacity ratio of the aluminum electrolytic capacitor using the electrolyte at a plurality of temperatures; the corresponding relation determining module is used for determining the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor according to the conductivity at a plurality of temperatures and the capacity ratio at a plurality of temperatures; and the optimized electrolyte capacity ratio determining module is used for acquiring the conductivity of the optimized electrolyte at a preset temperature and calculating the capacity ratio of the aluminum electrolytic capacitor using the optimized electrolyte according to the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor, wherein the preset temperature is within a set temperature range.
Further, the temperature range is set to-55 ℃ to-20 ℃.
Further, the correspondence determining module is specifically configured to employ the conductivity at the plurality of temperatures and the capacity ratio at the plurality of temperatures according to
Performing quadratic curve fitting to determine the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor; wherein,
C x℃ * showing the capacity ratio of an aluminum electrolytic capacitor using the electrolyte at a temperature of x deg.C, C showing the capacitance of an anodic oxide film of the aluminum electrolytic capacitor, omega showing the angular frequency of the voltage applied across the aluminum electrolytic capacitor, C Paper Represents the capacity, r, of the electrolytic paper impregnated with the electrolyte Liquid for treating urinary tract infection Showing the series resistance of the electrolytic paper impregnated with the electrolyte, P showing the resistivity of the electrolytic paper after impregnation with the electrolyte, L showing the thickness of the electrolytic paper, S showing the area of the electrolytic paper,
the equivalent coefficient representing the conductivity of the electrolyte and the resistivity of the electrolytic paper impregnated with the electrolyte, sigma represents the conductivity of the electrolyte, C 20℃ The capacity of an aluminum electrolytic capacitor using the electrolyte at a temperature of 20 ℃ is shown.
Further, the capacity ratio acquisition module includes: an electric capacity obtaining unit for obtaining an electric capacity of an aluminum electrolytic capacitor using the electrolytic solution at a plurality of temperatures; a capacity ratio acquisition unit for acquiring a capacity ratio based on
Determining the capacity ratio of the aluminum electrolytic capacitor using the electrolyte at a plurality of temperatures; wherein, C x℃ * Showing the capacity ratio at a temperature of x ℃ of an aluminum electrolytic capacitor using the electrolyte, C x℃ Showing the capacitance at a temperature of x ℃ of an aluminum electrolytic capacitor using the electrolyte, C 20℃ The capacity of an aluminum electrolytic capacitor using the electrolyte at a temperature of 20 ℃ is shown.
Further, the device also comprises an electrolyte optimization module which is used for obtaining the optimized electrolyte by changing the mass ratio of the main solute of the electrolyte and/or changing the solvent composition of the electrolyte.
The method for representing the capacity ratio of the aluminum electrolytic capacitor comprises the steps of obtaining the conductivity of electrolyte of the aluminum electrolytic capacitor at a plurality of temperatures within a set temperature range; obtaining the capacity ratio of the aluminum electrolytic capacitor using the electrolyte at a plurality of temperatures; determining the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor according to the conductivity at a plurality of temperatures and the capacity ratio at a plurality of temperatures; and obtaining the conductivity of the optimized electrolyte at a preset temperature, and calculating the capacity ratio of the aluminum electrolytic capacitor using the optimized electrolyte according to the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor, wherein the preset temperature is within a set temperature range. The technical scheme provided by the embodiment of the invention can solve the problem that whether the optimized electrolyte has the optimized effect can be judged only by using the optimized electrolyte to prepare the aluminum electrolytic capacitor and testing the capacity ratio of the aluminum electrolytic capacitor, thereby achieving the beneficial effects of saving the steps of using the optimized electrolyte to prepare the aluminum electrolytic capacitor and testing the capacity ratio of the aluminum electrolytic capacitor, shortening the research and development period and improving the research and development efficiency.
Drawings
FIG. 1 is a flow chart of a method for characterizing the capacity ratio of an aluminum electrolytic capacitor according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for characterizing the capacity ratio of an aluminum electrolytic capacitor according to a second embodiment of the present invention;
fig. 3 is a first equivalent circuit diagram of an aluminum electrolytic capacitor according to a second embodiment of the present invention;
fig. 4 is a second equivalent circuit diagram of an aluminum electrolytic capacitor provided by the second embodiment of the invention;
FIG. 5 is a third equivalent circuit diagram of an aluminum electrolytic capacitor according to the second embodiment of the present invention;
FIG. 6 is a diagram of a fourth equivalent circuit of an aluminum electrolytic capacitor according to a second embodiment of the present invention;
FIG. 7 is a graph showing the capacity ratio-conductivity relationship provided in example two of the present invention;
fig. 8 is a schematic structural diagram of an aluminum electrolytic capacitor capacity ratio characterization device provided in the third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a method for characterizing a capacity ratio of an aluminum electrolytic capacitor according to an embodiment of the present invention. The embodiment is applicable to the condition of representing the capacity ratio of the aluminum electrolytic capacitor, the capacity ratio representing method of the aluminum electrolytic capacitor can be executed by the capacity ratio representing method device of the aluminum electrolytic capacitor, and the capacity ratio representing device of the aluminum electrolytic capacitor can be realized in a software and/or hardware mode and is integrated in a terminal. Further, the terminal includes, but is not limited to: desktop computers, notebook computers, tablet computers and other intelligent terminals. With continued reference to fig. 1, the method for characterizing the capacity ratio of the aluminum electrolytic capacitor specifically comprises the following steps:
s110, acquiring the conductivity of the electrolyte of the aluminum electrolytic capacitor at a plurality of temperatures within a set temperature range.
Wherein, the conductivity is a measurement value representing the strength of the current transmission capability of the material, and the conductivity of the electrolyte of the aluminum electrolytic capacitor changes along with the change of the temperature.
Optionally, the set temperature range is-55 ℃ to-20 ℃.
Illustratively, the conductivity of the electrolyte of the aluminum electrolytic capacitor may be recorded every 5 ℃ interval in a temperature range of-55 ℃ to-20 ℃. It should be noted that the interval between the temperatures corresponding to two adjacent times of recording the electrical conductivity may be a fixed value, or may be different values, and may be set according to actual requirements, which is not limited in the embodiment of the present invention.
And S120, obtaining the capacity ratio of the aluminum electrolytic capacitor using the electrolyte at a plurality of temperatures.
Wherein the plurality of temperatures corresponding to the recording of the conductivity of the electrolyte of the aluminum electrolytic capacitor is the same as the plurality of temperatures corresponding to the recording of the capacity ratio of the aluminum electrolytic capacitor, specifically, if the temperature corresponding to the recording of the conductivity of the electrolyte of the aluminum electrolytic capacitor is T 1 、T 2 ···T n Then T should be recorded accordingly 1 、T 2 ···T n Capacity ratio of aluminum electrolytic capacitor at temperature.
S130, determining the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor according to the conductivity at a plurality of temperatures and the capacity ratio at a plurality of temperatures.
S140, the conductivity of the optimized electrolyte at a preset temperature is obtained, and the capacity ratio of the aluminum electrolytic capacitor using the optimized electrolyte is calculated according to the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor, wherein the preset temperature is within a set temperature range.
The aluminum electrolytic capacitor is composed of anode foil, cathode foil, electrolytic paper and other materials, all of which have influence on the capacitance of the aluminum electrolytic capacitor, and when the materials are fixed, the materials called the aluminum electrolytic capacitor are matched to be fixed. When the materials of the aluminum electrolytic capacitor are matched, the corresponding relation of the capacity ratio and the conductivity of the aluminum electrolytic capacitor is an internal relation and cannot change along with the change of the electrolyte, so that theoretically, the corresponding relation of the capacity ratio and the conductivity of the aluminum electrolytic capacitor using the electrolyte before optimization is the same as the corresponding relation of the capacity ratio and the conductivity of the aluminum electrolytic capacitor using the electrolyte after optimization.
According to the technical scheme of the embodiment of the invention, the capacity ratio of the aluminum electrolytic capacitor using the optimized electrolyte can be calculated by utilizing the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor and the conductivity of the optimized electrolyte. Therefore, whether the optimized electrolyte has the optimization effect can be judged without using the optimized electrolyte to prepare the aluminum electrolytic capacitor firstly and then testing the capacity ratio of the aluminum electrolytic capacitor in the prior art, so that the embodiment of the invention solves the problem of long research and development period caused by using the optimized electrolyte to prepare the aluminum electrolytic capacitor, and achieves the beneficial effects of reducing the preparation times of the aluminum electrolytic capacitor, reducing the research and development cost and time and improving the research and development efficiency.
Example two
Fig. 2 is a flowchart of a method for characterizing the capacity ratio of an aluminum electrolytic capacitor provided in the second embodiment of the present invention. The method for characterizing the capacity ratio of the aluminum electrolytic capacitor specifically comprises the following steps:
s210, acquiring the conductivity of the electrolyte of the aluminum electrolytic capacitor at a plurality of temperatures within a set temperature range.
S220, obtaining the capacitance of the aluminum electrolytic capacitor using the electrolyte at a plurality of temperatures
The capacity ratio of the aluminum electrolytic capacitor using the electrolyte at a plurality of temperatures was determined.
Wherein, C x℃ * Showing the capacity ratio at a temperature of x ℃ of an aluminum electrolytic capacitor using the electrolyte, C x℃ Showing the capacitance at a temperature of x ℃ of an aluminum electrolytic capacitor using the electrolyte, C 20℃ The capacity of an aluminum electrolytic capacitor using the electrolyte at a temperature of 20 ℃ is shown.
S230, adopting according to the conductivity at a plurality of temperatures and the capacity ratio at a plurality of temperatures
Performing quadratic curve fitting to determine the corresponding relationship between the capacity ratio and the conductivity of the aluminum electrolytic capacitor,
wherein, C x℃ * Showing the capacity ratio of the aluminum electrolytic capacitor using the electrolyte at the temperature of x ℃, and C shows the anode oxygen of the aluminum electrolytic capacitorThe capacitance of the equivalent capacitance of the film, ω, represents the angular frequency of the voltage applied across the aluminum electrolytic capacitor, C Paper Capacitance, r, of an equivalent capacitance of an electrolytic paper impregnated with an electrolyte Liquid for treating urinary tract infection Showing the resistance value of the series resistance of the electrolytic paper impregnated with the electrolyte, p showing the resistivity of the electrolytic paper after impregnation with the electrolyte, L showing the thickness of the electrolytic paper, S showing the area of the electrolytic paper,
the equivalent coefficient of the conductivity of the electrolyte and the resistivity of the electrolytic paper impregnated with the electrolyte is shown, sigma represents the conductivity of the electrolyte, C 20℃ The capacity of an aluminum electrolytic capacitor using the electrolyte at a temperature of 20 ℃ is shown.
S240, the conductivity of the optimized electrolyte at a preset temperature is obtained, and the capacity ratio of the aluminum electrolytic capacitor using the optimized electrolyte is calculated according to the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor, wherein the preset temperature is within a set temperature range.
Optionally, before obtaining the conductivity of the optimized electrolyte at the preset temperature and calculating the capacity ratio of the aluminum electrolytic capacitor using the optimized electrolyte according to the corresponding relationship between the capacity ratio and the conductivity of the aluminum electrolytic capacitor, the method further includes: and obtaining the optimized electrolyte by changing the mass ratio of the main solute of the electrolyte and/or changing the solvent composition of the electrolyte.
Illustratively, the electrolyte may be optimized by changing the mass ratio of the primary solute of the electrolyte, such as changing the mass ratio of the primary solute from 5% to 3%, 6%, or 8%; and the electrolyte can be optimized by changing the solvent composition of the electrolyte, such as changing the glycol solvent in the electrolyte to a mixed solvent of glycol and gamma-butyrolactone.
Fig. 3 is a first equivalent circuit diagram of an aluminum electrolytic capacitor according to a second embodiment of the present invention. Continuing with FIG. 3, anodic oxide film C of aluminum electrolytic capacitor ST1 C, equivalent parallel resistance R of the anodic oxide film ST1 Has a resistance value of R, and electrolytic paper C impregnated with an electrolytic solution ST2 Has a capacitance of C Paper Is impregnated withSeries resistance R of electrolytic paper of electrolyte ST2 Has a resistance value of r Liquid for treating urinary tract infection . In general, the value of R is large, and therefore, C ST1 And R ST1 Can be equivalent to C ST1 I.e. ignoring R. Obtaining FIG. 4, FIG. 4 is a second equivalent circuit diagram of an aluminum electrolytic capacitor provided by the second embodiment of the present invention, and referring to FIG. 4 ST2 And R ST2 Parallel connection, and conversion according to series and parallel equivalent circuits to obtain figure 5, wherein figure 5 is a third equivalent circuit diagram of the aluminum electrolytic capacitor provided by the second embodiment of the invention, and the equivalent series capacitance C of the electrolytic paper soaked with the electrolyte ST3 Is C' Paper Equivalent series resistance R of electrolytic paper impregnated with electrolyte ST3 Has a resistance value of r' Liquid for treating urinary tract infection ，
Where ω represents the angular frequency of the voltage applied across the aluminum electrolytic capacitor.
And due to C ST1 And C ST3 Are connected in series and converted according to a series equivalent circuit to obtain a diagram 6, and the diagram 6 is a fourth equivalent circuit diagram of the aluminum electrolytic capacitor provided by the second embodiment of the invention, wherein the equivalent capacitance C of the capacitor ST4 Has a capacitance of C r ，
Obviously, when r is Liquid for medical purpose If =0, i.e., if the conductivity of the electrolyte is very high, C is ideally present r ＝C；
At low temperatures, ω C Paper r Liquid for medical purpose < 1, in which case, C r Can be further simplified to obtain:
when the material of the aluminum electrolytic capacitor is matched with a timer C Paper And C isA fixed value, of
Wherein P represents the resistivity of the electrolytic paper after being impregnated with the electrolyte, L represents the thickness of the electrolytic paper, S represents the area of the electrolytic paper,
the equivalent coefficient represents the conductivity of the electrolyte and the resistivity of the electrolytic paper impregnated with the electrolyte, and σ represents the conductivity of the electrolyte.
Further, the capacity ratio of the aluminum electrolytic capacitor at the temperature of x ℃ is as follows:
wherein, C 20℃ The capacity of an aluminum electrolytic capacitor using the electrolyte at a temperature of 20 ℃ is shown.
Obviously, when the material of the aluminum electrolytic capacitor is matched, in the calculation formula of the electric capacity of the aluminum electrolytic capacitor, only the conductivity of the electrolyte changes with the change of the temperature, and the electric capacity of the aluminum electrolytic capacitor has a quadratic relation with the conductivity of the electrolyte, further, the capacity ratio of the aluminum electrolytic capacitor changes with the change of the temperature, and the capacity ratio of the aluminum electrolytic capacitor has a quadratic relation with the conductivity of the electrolyte.
Illustratively, the conductivity of the electrolyte A1 is respectively tested at-34 ℃, -36 ℃, -38 ℃, -40 ℃ and-45 ℃, specifically, the electrolyte A1 is placed in a protective cover of a probe of a conductivity tester, and then the protective cover is screwed with the probe to ensure the tightness; placing a test probe filled with the electrolyte A1 into a low-temperature test box, extending one end of the test probe connected with a conductivity tester out of the side surface of the low-temperature test box to be connected with the conductivity tester, and then adjusting the temperature of the low-temperature test box to-34 ℃; and when the temperature of the low-temperature test chamber reaches minus 34 ℃, recording the conductivity value once every 20 minutes, and when the current value and the latter value are not changed, the conductivity value of the electrolyte A1 at minus 34 ℃ is obtained. Finally, the temperature of the low-temperature test chamber is continuously adjusted, and the conductivity of the electrolyte A1 at-36 ℃, 38 ℃, 40 ℃ and 45 ℃ is respectively tested.
The aluminum electrolytic capacitor prepared using the electrolyte A1 was tested for capacity ratios at-34 ℃, -36 ℃, -38 ℃, -40 ℃ and-45 ℃. Specifically, a temperature frequency testing system is used for respectively testing the capacitance of the aluminum electrolytic capacitor prepared by the electrolyte at the corresponding temperature, and then the corresponding capacity ratio is calculated. The conductivity of the electrolyte A1 at-34 ℃, -36 ℃, -38 ℃, -40 ℃ and-45 ℃ and the capacity ratio of the aluminum electrolytic capacitor prepared using the electrolyte A1 at-34 ℃, -36 ℃, -38 ℃, -40 ℃ and-45 ℃ are shown in Table 1.
TABLE 1 conductivity to Capacity ratio data sheet for electrolyte A1
According to the conductivity of the electrolyte and the capacity ratio of the aluminum electrolytic capacitor, the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor at low temperature is obtained as follows:
C * ＝0.69153+0.01071×σ-1.2160×10 -4 ×σ 4
optimizing on the basis of the electrolyte A1 to obtain electrolytes A2, A3, A4, A5, A6 and A7, respectively testing the conductivities of the electrolytes A2, A3, A4, A5, A6 and A7 at the temperature of minus 40 ℃ and the capacity ratios of corresponding capacitors at the temperature of minus 40 ℃, and calculating the capacity ratios of the corresponding electrolytes according to the corresponding relationship between the capacity ratios and the conductivities, which is shown in a table 2.
TABLE 2 conductivity to Capacity ratio data sheet for electrolytes A2-A7
The capacity ratio is an important parameter for representing the low-temperature performance of the wide-temperature aluminum electrolytic capacitor, and the numerical value of the capacity ratio is generally required to be more than that of the wide-temperature aluminum electrolytic capacitorEqual to 0.80. Fig. 7 is a graph of the capacity ratio-conductivity correspondence relationship provided in the second embodiment of the present invention, in which a rectangular block-a solid line represents an actually measured capacity ratio-conductivity correspondence relationship curve, and a circular dot-a solid line represents a fitted capacity ratio-conductivity correspondence relationship curve, and it can be seen that the larger the conductivity is, the larger the capacity ratio is, and the calculated capacity ratio C of the electrolytes A3, A4, A5, A6, and A7 is # Not less than 0.8, the requirement of the wide-temperature aluminum electrolytic capacitor is met, and the electrolyte A2 does not meet the requirement of the wide-temperature aluminum electrolytic capacitor. As can be seen from the measured results, the calculated results are substantially consistent with the measured results.
It is worth noting that the method can judge the change trend of the capacity ratio through the conductivity change trend of the electrolyte, so that whether the optimized electrolyte has the optimization effect or not can be quickly judged according to the conductivity change trend of the optimized electrolyte without calculating the specific value of the capacity ratio of the aluminum electrolytic capacitor prepared by using the optimized electrolyte.
EXAMPLE III
Fig. 8 is a schematic structural diagram of an aluminum electrolytic capacitor capacity ratio characterization apparatus provided in the third embodiment of the present invention. The device comprises: the conductivity acquisition module 110 is configured to acquire conductivity of an electrolyte of the aluminum electrolytic capacitor at a plurality of temperatures within a set temperature range; a capacity ratio acquisition module 120 for acquiring a capacity ratio of the aluminum electrolytic capacitor using the electrolyte at a plurality of temperatures; a correspondence determining module 130, configured to determine a correspondence between the capacity ratio and the conductivity of the aluminum electrolytic capacitor according to the conductivities at multiple temperatures and the capacity ratios at multiple temperatures; and an optimized electrolyte capacity ratio determining module 140, configured to obtain the conductivity of the optimized electrolyte at a preset temperature, and calculate the capacity ratio of the aluminum electrolytic capacitor using the optimized electrolyte according to a corresponding relationship between the capacity ratio and the conductivity of the aluminum electrolytic capacitor, where the preset temperature is within a set temperature range.
According to the technical scheme of the embodiment of the invention, the capacity ratio of the aluminum electrolytic capacitor using the optimized electrolyte can be calculated by utilizing the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor and the conductivity of the optimized electrolyte. Therefore, whether the optimized electrolyte has the optimization effect can be judged without using the optimized electrolyte to prepare the aluminum electrolytic capacitor firstly and then testing the capacity ratio of the aluminum electrolytic capacitor in the prior art, so that the embodiment of the invention solves the problem of long research and development period caused by using the optimized electrolyte to prepare the aluminum electrolytic capacitor, and achieves the beneficial effects of reducing the preparation times of the aluminum electrolytic capacitor, reducing the research and development cost and time and improving the research and development efficiency.
Optionally, the set temperature range is-55 ℃ to-20 ℃.
Optionally, the correspondence determining module 130 is specifically configured to adopt the method according to the conductivities at the temperatures and the capacity ratios at the temperatures
Performing quadratic curve fitting to determine the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor; wherein,
C x℃ * showing the capacity ratio of the aluminum electrolytic capacitor using the electrolyte at a temperature of x deg.C, C showing the capacity of the anodic oxide film of the aluminum electrolytic capacitor, omega showing the angular frequency of the voltage applied across the aluminum electrolytic capacitor, C Paper Represents the capacitance, r, of the electrolytic paper impregnated with the electrolyte Liquid for medical purpose Showing the series resistance of the electrolytic paper impregnated with the electrolyte, P showing the resistivity of the electrolytic paper after impregnation with the electrolyte, L showing the thickness of the electrolytic paper, S showing the area of the electrolytic paper,
the equivalent coefficient of the conductivity of the electrolyte and the resistivity of the electrolytic paper impregnated with the electrolyte is shown, sigma represents the conductivity of the electrolyte, C 20℃ The capacity of an aluminum electrolytic capacitor using the electrolyte at a temperature of 20 ℃ is shown.
Optionally, the capacity ratio obtaining module includes 120: an electric capacity obtaining unit for obtaining an electric capacity of an aluminum electrolytic capacitor using the electrolytic solution at a plurality of temperatures; capacity ofA ratio acquisition unit for obtaining a ratio based on
Determining the capacity ratio of the aluminum electrolytic capacitor using the electrolyte at a plurality of temperatures; wherein, C x℃ * Showing the capacity ratio at a temperature of x ℃ of an aluminum electrolytic capacitor using the electrolyte, C x℃ Showing the capacitance at a temperature of x ℃ of an aluminum electrolytic capacitor using the electrolyte, C 20℃ The capacity of an aluminum electrolytic capacitor using the electrolyte at a temperature of 20 ℃ is shown.
Optionally, the apparatus further includes an electrolyte optimization module, configured to obtain an optimized electrolyte by changing a mass ratio of a main solute of the electrolyte and/or changing a composition of a solvent component of the electrolyte.
The device for representing the capacity ratio of the aluminum electrolytic capacitor provided by the embodiment of the invention has the corresponding beneficial effects of the method for representing the capacity ratio of the aluminum electrolytic capacitor provided by the embodiment of the invention, and the details are not repeated.
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (4)
1. A method for characterizing the capacity ratio of an aluminum electrolytic capacitor is characterized by comprising the following steps:
acquiring the conductivity of the electrolyte of the aluminum electrolytic capacitor at a plurality of temperatures within a set temperature range; wherein the set temperature range is-55 ℃ to-20 ℃;
obtaining capacity ratios of the aluminum electrolytic capacitor using the electrolyte at the plurality of temperatures;
determining the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor according to the conductivity at the plurality of temperatures and the capacity ratio at the plurality of temperatures;
the method comprises the steps of obtaining the conductivity of an optimized electrolyte at a preset temperature, and calculating the capacity ratio of the aluminum electrolytic capacitor using the optimized electrolyte according to the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor, wherein the preset temperature is within the set temperature range;
wherein the obtaining of the capacity ratios of the aluminum electrolytic capacitor using the electrolytic solution at the plurality of temperatures comprises:
acquiring the capacitance of the aluminum electrolytic capacitor using the electrolyte at the plurality of temperatures;
according to
Determining a capacity ratio of an aluminum electrolytic capacitor using the electrolyte at the plurality of temperatures;
wherein, C x℃ * Represents the capacity ratio at the temperature of x ℃ of an aluminum electrolytic capacitor using the electrolyte, C x℃ Represents the capacitance at a temperature of x ℃ of an aluminum electrolytic capacitor using the electrolyte, C 20℃ Showing the capacity of an aluminum electrolytic capacitor using the electrolyte at a temperature of 20 ℃;
the determining the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor according to the conductivity at the plurality of temperatures and the capacity ratio at the plurality of temperatures comprises the following steps:
according to the electric conductivity at the plurality of temperatures and the capacity ratio at the plurality of temperatures, adopting
Performing quadratic curve fitting to determine the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor;
wherein,
C x℃ * showing the capacity ratio of an aluminum electrolytic capacitor using the electrolytic solution at a temperature of x ℃, C showing the capacitance of an anodic oxide film of the aluminum electrolytic capacitor, ω showing the angular frequency of a voltage applied across the aluminum electrolytic capacitor, C Paper Represents the capacity, r, of the electrolytic paper impregnated with the electrolyte Liquid for medical purpose Represents the series resistance of the electrolytic paper impregnated with the electrolytic solution, ρ represents the resistivity of the electrolytic paper after impregnation with the electrolytic solution, L represents the thickness of the electrolytic paper, S represents the area of the electrolytic paper,
an equivalent coefficient representing the conductivity of the electrolyte and the resistivity of the electrolytic paper impregnated with the electrolyte, sigma represents the conductivity of the electrolyte, C 20℃ Showing the capacity of an aluminum electrolytic capacitor using the electrolyte at a temperature of 20 c.
2. The method according to claim 1, before obtaining the conductivity of the optimized electrolyte at the preset temperature and calculating the capacity ratio of the aluminum electrolytic capacitor using the optimized electrolyte according to the corresponding relationship between the capacity ratio and the conductivity of the aluminum electrolytic capacitor, further comprising:
and obtaining the optimized electrolyte by changing the mass ratio of the main solute of the electrolyte and/or changing the solvent composition of the electrolyte.
3. An aluminum electrolytic capacitor characterization device, comprising:
the conductivity acquisition module is used for acquiring the conductivity of the electrolyte of the aluminum electrolytic capacitor at a plurality of temperatures within a set temperature range; wherein the set temperature range is-55 ℃ to-20 ℃;
a capacity ratio acquisition module for acquiring the capacity ratios of the aluminum electrolytic capacitor using the electrolyte at the plurality of temperatures;
the corresponding relation determining module is used for determining the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor according to the conductivity at the temperatures and the capacity ratio at the temperatures;
the optimized electrolyte capacity ratio determining module is used for acquiring the conductivity of the optimized electrolyte at a preset temperature and calculating the capacity ratio of the aluminum electrolytic capacitor using the optimized electrolyte according to the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor, wherein the preset temperature is within the set temperature range;
wherein the capacity ratio acquisition module includes:
a capacitance obtaining unit for obtaining capacitances of the aluminum electrolytic capacitor using the electrolytic solution at the plurality of temperatures;
a capacity ratio acquisition unit for obtaining a capacity ratio based on
Determining a capacity ratio of an aluminum electrolytic capacitor using the electrolyte at the plurality of temperatures;
wherein, C x℃ * Represents the capacity ratio at the temperature of x ℃ of an aluminum electrolytic capacitor using the electrolyte, C x℃ Represents the capacitance at a temperature of x ℃ of an aluminum electrolytic capacitor using the electrolyte, C 20℃ Showing the capacity of an aluminum electrolytic capacitor using the electrolyte at a temperature of 20 ℃;
the corresponding relation determining module is further used for adopting the corresponding relation according to the electric conductivity at the plurality of temperatures and the capacity ratio at the plurality of temperatures
Performing quadratic curve fitting to determine the corresponding relation between the capacity ratio and the conductivity of the aluminum electrolytic capacitor;
wherein,
C x℃ * represents the use of the electricityThe capacity ratio of the electrolytic capacitor at the temperature of x ℃, C represents the capacitance of the anodic oxide film of the electrolytic capacitor, omega represents the angular frequency of the voltage applied across the electrolytic capacitor, C Paper Represents the capacitance, r, of the electrolytic paper impregnated with the electrolyte Liquid for medical purpose Represents the series resistance of the electrolytic paper impregnated with the electrolytic solution, ρ represents the resistivity of the electrolytic paper after impregnation with the electrolytic solution, L represents the thickness of the electrolytic paper, S represents the area of the electrolytic paper,
an equivalent coefficient representing the conductivity of the electrolyte and the resistivity of the electrolytic paper impregnated with the electrolyte, sigma represents the conductivity of the electrolyte, C 20℃ Showing the capacity of an aluminum electrolytic capacitor using the electrolyte at a temperature of 20 c.
4. The apparatus of claim 3, further comprising an electrolyte optimization module for obtaining an optimized electrolyte by changing a mass ratio of a main solute of the electrolyte and/or changing a solvent composition of the electrolyte.
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| US20050260490A1 (en) * | 2004-05-19 | 2005-11-24 | Luigi Persi | Adhesive-treated electrode separator and method of adhering an electrode thereto |
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| CN104813179A (en) * | 2012-11-30 | 2015-07-29 | 株式会社杰士汤浅国际 | Device for estimating post-deterioration functionality of storage element, method for estimating post-deterioration functionality, and storage system |
| CN108123172A (en) * | 2016-11-29 | 2018-06-05 | 宁德时代新能源科技股份有限公司 | Electrolyte and secondary lithium battery |
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