CN111220850A - Battery diaphragm resistance value measuring method and device - Google Patents
Battery diaphragm resistance value measuring method and device Download PDFInfo
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- CN111220850A CN111220850A CN201911129457.1A CN201911129457A CN111220850A CN 111220850 A CN111220850 A CN 111220850A CN 201911129457 A CN201911129457 A CN 201911129457A CN 111220850 A CN111220850 A CN 111220850A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
The embodiment of the invention discloses a method for measuring the resistance value of a battery diaphragm, which comprises the following steps: measuring an internal resistance value of at least one sample cell, each sample cell including at least one layer of sample membrane; calculating the ionic conductivity of the single-layer sample diaphragm according to the internal resistance value of at least one sample battery and the number of sample diaphragm layers; calculating the total resistance value of the to-be-measured diaphragm of the to-be-measured battery according to the ionic conductivity of the single-layer sample diaphragm; the sample diaphragm and the diaphragm to be tested of the battery to be tested have the same ionic conductivity, and at least one sample battery has the same electrolyte as the battery to be tested. The invention also provides a device for measuring the resistance value of the battery diaphragm. The invention can effectively reduce the measurement cost, and has simple measurement method and accurate result.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method and a device for measuring the resistance value of a battery diaphragm.
Background
The internal resistance of the battery is one of the most important characteristic parameters of the battery, is an important parameter influencing the cycle life and performance of the battery, is a main mark for measuring the difficulty of electron and ion transmission in an electrode, and has important influence on the performances of quick charge, heat production, aging and the like of the battery.
The research and improvement of the internal resistance performance of the battery require the development of a corresponding test analysis method to clearly analyze the resistance values of all parts in the battery. The existing battery diaphragm test method separates the anode and cathode materials and the diaphragm from the battery to carry out the ionic conductivity test, and a special device is needed in the test. This results in measurements that do not reflect the ionic conductivity of the separator in the electrolyte of the battery, and the pressure of the special device during testing can affect the testing effect.
Disclosure of Invention
In view of the above, it is necessary to provide a method for measuring the resistance of a battery separator.
A battery separator resistance measurement method, the method comprising: measuring an internal resistance value of at least one sample cell, each of the sample cells including at least one layer of a sample membrane; calculating the ionic conductivity of the single-layer sample diaphragm according to the internal resistance value of the at least one sample battery and the number of the sample diaphragm layers; calculating the total resistance value of the to-be-measured diaphragm of the to-be-measured battery according to the ionic conductivity of the single-layer sample diaphragm; the sample diaphragm and the diaphragm to be tested of the battery to be tested have the same ionic conductivity, and the at least one sample battery has the same electrolyte as the battery to be tested.
Wherein the step of measuring the internal resistance value of at least one sample cell comprises: adjusting the number of layers of a sample membrane of each sample cell; measuring at least one internal resistance value when each of the sample cells has a different number of layers of the sample separator; the step of calculating the ionic conductivity of the single-layer sample diaphragm according to the internal resistance value of the at least one sample battery and the number of the sample diaphragm layers, which the sample diaphragm has, includes: performing linear fitting on the at least one internal resistance value to obtain a fitted straight line, wherein the slope of the fitted straight line is the resistance value of the single-layer sample diaphragm of the sample battery; and calculating the ionic conductivity of the single-layer sample diaphragm according to the resistance value of the single-layer sample diaphragm and the area of the single-layer sample diaphragm.
Wherein, after the step of performing linear fitting on the at least one internal resistance value and the number of the sample diaphragm layers corresponding to the at least one internal resistance value to obtain a fitted straight line, the method comprises the following steps: and calculating the fitting degree of the fitting straight line, wherein if the fitting degree is greater than a preset threshold value, the slope of the fitting straight line is the resistance value of the single-layer sample diaphragm of the sample battery.
Before the step of calculating the ionic conductivity of the single-layer sample diaphragm according to the resistance value of the single-layer sample diaphragm and the area of the single-layer sample diaphragm, the method includes: calculating a mean value of the resistance values of the single-layer sample membranes of the at least one sample cell, and taking the mean value as the resistance value of the single-layer sample membranes.
Wherein, the total resistance of the diaphragm to be measured of the battery to be measured is calculated according to the ionic conductivity of the single-layer sample diaphragm, and the method comprises the following steps: and calculating the total resistance value of the diaphragm to be detected of the battery to be detected according to the ion conductivity of the single-layer sample diaphragm and the total area of the diaphragm to be detected.
Each sample battery comprises a positive plate and two negative plates positioned on two sides of the positive plate, and at least one layer of sample diaphragm is arranged between the positive plate and each negative plate.
And the area of the single-layer sample diaphragm is smaller than that of the single-layer diaphragm to be detected.
Wherein the number of layers of the sample separator of each sample cell is less than or equal to 5.
A battery separator resistance measurement device comprising: the measuring module is used for measuring the internal resistance value of at least one sample battery, and each sample battery comprises at least one layer of sample diaphragm; the first calculation module is used for calculating the ionic conductivity of a single-layer sample diaphragm according to the internal resistance value of the at least one sample battery and the number of sample diaphragm layers; the second calculation module is used for calculating the total resistance value of the to-be-measured diaphragm of the to-be-measured battery according to the ionic conductivity of the single-layer sample diaphragm; the sample diaphragm and the diaphragm to be tested of the battery to be tested have the same ionic conductivity, and the at least one sample battery has the same electrolyte as the battery to be tested.
A battery separator resistance measurement device comprising: a measurement circuit, a processor, a memory, the processor coupled to the memory and the measurement circuit, the memory having stored therein a computer program, the processor executing the computer program to implement the method as described above.
The embodiment of the invention has the following beneficial effects:
the resistance value of the sample diaphragm is obtained by measuring the internal resistance value of at least one sample battery, and the sample diaphragm and the diaphragm to be measured of the battery to be measured have the same ionic conductivity, so that the total resistance value of the diaphragm to be measured of the battery to be measured can be calculated according to the ionic conductivity of the sample diaphragm without damaging the battery to be measured or special equipment, the measurement cost can be effectively reduced, the measurement method is simple, and the result is accurate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
FIG. 1 is a schematic flow chart of a method for measuring the resistance of a battery separator according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for measuring the resistance of a battery separator according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a sample cell in the method for measuring the resistance of a battery separator according to the present invention;
FIG. 4 is a schematic diagram of a fitted straight line in the battery separator resistance measurement method provided by the invention;
FIG. 5 is a schematic structural diagram of a battery separator resistance measuring device according to a first embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a battery separator resistance measuring device according to a second embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an embodiment of a computer-readable storage medium provided herein.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
When measuring the resistance value of the diaphragm to be tested of the battery to be tested in the prior art, the diaphragm to be tested is usually separated from the battery to be tested for measurement, which results in that the measurement result cannot embody the ionic conductivity of the diaphragm in the electrolyte of the battery to be tested, and the pressure when a special device is adopted for testing also influences the test effect.
In this embodiment, in order to solve the above problem, a method for measuring a resistance of a battery diaphragm is provided, which can accurately measure a total resistance of a to-be-measured diaphragm of a to-be-measured battery.
Referring to fig. 1 and fig. 3 in combination, fig. 1 is a schematic flow chart of a method for measuring a resistance of a battery separator according to an embodiment of the present invention. Fig. 3 is a schematic structural diagram of a sample battery in the battery separator resistance measurement method provided by the invention.
The battery diaphragm resistance value measuring method provided by the invention comprises the following steps:
s101: the internal resistance value of at least one sample cell is measured.
In one particular implementation scenario, at least one sample cell is prepared. The structure of the sample cell is shown in fig. 3. The sample battery 10 comprises a positive plate 11 and two negative plates 12 and 13, the negative plates 12 and 13 are respectively located on two sides of the positive plate 11, at least one layer of sample diaphragm 14 is arranged between the positive plate 11 and the negative plate 12, and similarly, at least one layer of sample diaphragm 14 is also arranged between the positive plate 11 and the negative plate 13. The sample membrane 14 has the same ionic conductivity as the membrane to be tested of the cell to be tested. The sample cell 10 has the same electrolyte as the cell to be tested. The number of layers of the sample separator 14 between the positive electrode sheet 11 and the two negative electrode sheets 12 and 13 can be adjusted. The internal resistance values of one sample cell 10 with different numbers of sample separators 14 were measured. The internal resistance value of the sample cell 10 can be measured by an ac internal resistance measuring instrument. In order to make the measured result similar to the actual result, the sample cell 10 has the same electrolyte as the cell to be tested, and the sample membrane 14 of the sample cell 10 has the same ionic conductivity as the membrane to be tested of the cell to be tested. Therefore, the resistance value of the diaphragm to be tested of the battery to be tested in the electrolyte can be measured. The ionic conductivity of the battery membrane is related to the thickness of the membrane, in this implementation scenario, the sample membrane 14 has the same thickness as the membrane to be tested.
S102: and calculating the ionic conductivity of the single-layer sample diaphragm according to the internal resistance value of the at least one sample battery and the number of the sample diaphragm layers.
In the present implementation scenario, the resistance value of the single-layer sample membrane 14 is first calculated, and since the sample membrane 14 is prepared in advance by the user, the area and thickness of the sample membrane 14 are known, so that the ionic conductivity of the single-layer sample membrane 14 can be calculated. Internal resistance value R of sample battery 10cellIncluding the total resistance value R of the sample membrane 14 of the sample cell and the resistance value R of the rest of the sample cell 10other. Wherein the resistance value R of the other portion of each sample cell 10otherAnd maintained unchanged. Resistance value R at other portions of sample cell 10otherThereafter, the internal resistance value R of the sample cell 10 can be passedcellMinus the resistance R of the rest of the sample cellotherThe total resistance R of the sample membrane 14 of the sample cell 10 is determined and the sample cell is usedThe total resistance R of the sample membrane 14 of the sample cell 10 is divided by the number of layers of the sample membrane 14 of the sample cell 10 to calculate the resistance R of the single-layer sample membrane 14 of the sample cell 10S。
In other implementation scenarios, the internal resistance values of the sample cell 10 with different numbers of sample membranes 14 may be measured, and the resistance value of a single-layer sample membrane 14 may be calculated according to the difference between the internal resistance values and the difference between the numbers of sample membranes 14. For example, the internal resistance value R of the sample cell 10 when having two layers of the sample separator 14cellIs A, internal resistance R with four sample membranes 14cellB, the resistance of the two sample membranes 14 can be calculated as a-B, and the resistance R of the single sample membrane 14SIs (A-B)/2.
Calculate the resistance R of the single layer sample diaphragm 14SThen, according to the formula σS＝L/(S*RS) Calculating the ion conductivity of the single-layer sample diaphragm. Wherein σSThe ionic conductivity of the single-layer sample diaphragm is shown, L is the thickness of the sample diaphragm in the sample battery, and S is the area of the sample diaphragm corresponding to the positive plate in the sample battery. Please refer to fig. 3. In the present embodiment, the sample cell 10 includes a positive electrode sheet 11, and both surfaces of the positive electrode sheet 11 correspond to the sample separator 14. In this embodiment, if the size of the positive electrode sheet is 50mm × 76mm, the area S of the sample separator corresponding to the positive electrode sheet in the sample cell is 50 × 76 × 2 — 7600mm2。RSThe resistance of the single-layer sample separator was 41.00m Ω. The membrane thickness L is 20 μm. Thus, in this implementation scenario, the single layer sample membrane ionic conductivity σS＝L/(S*RS)＝20μm/(7600mm2*41.00mΩ)＝0.06418S/m。
S103: and calculating the total resistance value of the to-be-measured diaphragm of the to-be-measured battery according to the ionic conductivity of the single-layer sample diaphragm.
In the implementation scenario, the ionic conductivity of the sample diaphragm 14 is calculated according to the resistance of the single-layer sample diaphragm 14, and the ionic conductivity of the sample diaphragm 14 is the same as the ionic conductivity of the to-be-detected diaphragm of the to-be-detected battery, so that the ionic conductivity of the to-be-detected diaphragm is obtained, and then the total resistance of the to-be-detected diaphragm of the to-be-detected battery is calculated according to the ionic conductivity of the to-be-detected diaphragm.
As can be seen from the above description, in this embodiment, a sample battery having an electrolyte solution identical to that of the battery to be measured and a sample diaphragm having an ionic conductivity identical to that of the diaphragm to be measured of the battery to be measured is prepared, the internal resistance value of the sample battery is measured to calculate the resistance value of the single-layer sample diaphragm, and further calculate the ionic conductivity of the sample diaphragm, since the ionic conductivity of the sample diaphragm is identical to that of the diaphragm to be measured, the total resistance value of the diaphragm to be measured of the battery to be measured can be calculated according to the ionic conductivity, the resistance value of the diaphragm to be measured in the electrolyte solution of the battery to be measured can be accurately measured, the battery to be measured does not need to be damaged, a special device is not needed, the measurement cost can.
Referring to fig. 2, fig. 2 is a schematic flow chart of a battery separator resistance measurement method according to a second embodiment of the present invention. The battery diaphragm resistance value measuring method provided by the invention comprises the following steps:
s201: and adjusting the number of layers of the sample diaphragm of each sample battery, and measuring at least one internal resistance value when each sample battery has different numbers of layers of the sample diaphragm.
In one particular implementation scenario, at least one sample cell is prepared. Please refer to fig. 3.
In the present implementation scenario, the internal resistance value R of the sample cell 10 when provided with a single layer sample membrane 141cell＝RS+RotherWherein R isSResistance of a single layer sample diaphragm, RotherIs the resistance of the rest of the sample cell. Internal resistance value R of sample cell 10 when x layers of sample separator 14 are providedxcell＝x*RS+RotherWherein R isSResistance of a single layer sample diaphragm, RotherIs the resistance of the rest of the sample cell. In this embodiment, the number of layers of the sample separator 14 in the sample cell 10 may be set to 1-5 layers, and in other embodiment, it may be set to more layers, such as 7 layers, 10 layers, etc. In the present embodiment, the internal resistance values of the sample cell 10 with 1-5 sample membranes 14 are measured。
In the present implementation scenario, the internal resistance values were measured when three sample cells had different numbers of layers of sample separators. See table 1 for specific measurement results.
Table 1S 202: and performing linear fitting on the at least one internal resistance value to obtain a fitted straight line, wherein the slope of the fitted straight line is the resistance value of the single-layer sample diaphragm of the sample battery.
In the present implementation scenario, according to formula R1cell＝RS+RotherAnd Rxcell＝x*RS+RotherIn other words, the at least one internal resistance value is linearly fitted, and the slope of the fitted straight line is the resistance value of the single-layer sample separator of the sample battery. According to the internal resistance values of 3 sample batteries with different numbers of sample diaphragms shown in table 1, linear fitting is respectively performed to obtain 3 fitting straight lines, as shown in fig. 4, fig. 4 is a schematic diagram of the fitting straight lines in the battery diaphragm resistance value measuring method provided by the invention.
As shown in fig. 4, the 3 straight lines fitted with the internal resistance values of the 3 sample cells shown in table 1 with different numbers of layers of sample separators are y-41.927 x +46.313, y-40.218 x +46.768, and y-40.842 x +47.078, respectively. It is possible to obtain resistance values of 41.927m Ω, 40.218m Ω, and 40.842m Ω of the single-layer sample separator of the 3 sample cells.
Further, in other implementations, the resistance of the single-layer sample membrane is prevented from being erroneous due to the occurrence of measurement errors. Therefore, after the fitted straight line is calculated, the degree of fitting of the fitted straight line is calculated. The fitting degree test is to test the prepared prediction models and compare the coincidence degree of the prediction results with the actual occurrence conditions. In this embodiment, if the fitting degree is higher than the preset threshold, which indicates that the fitting degree meets the requirement, the slope of the fitting straight line may be the resistance value of the single-layer sample membrane of the sample cell. In this implementation scenario, the degree of fit is required to be greater than 0.99.
The fitting degrees of the 3 fitting straight lines y-41.927 x +46.313, y-40.218 x +46.768 and y-40.842 x +47.078 are calculated to be 0.9996, 0.9967 and 0.9986 respectively, and are all larger than a preset threshold value of 0.99, so 41.927m Ω, 40.218m Ω and 40.842m Ω can be used as the resistance values of the single-layer sample diaphragm.
The total resistance value of the to-be-tested diaphragm of the to-be-tested battery can be calculated according to the resistance value of one single-layer sample diaphragm. Further, the resistance values of the single-layer sample separators of the 3 sample cells may be averaged, and the average value may be used as the resistance value of the single-layer sample separator. In the present implementation scenario, RS＝(41.927+40.218+40.842)/3＝41.00mΩ。
S203: and calculating the ionic conductivity of the single-layer sample diaphragm according to the resistance value of the single-layer sample diaphragm and the area of the single-layer sample diaphragm.
In the present implementation scenario, σ is expressed according to the formulaS＝L/(S*RS) Calculating the ion conductivity of the single-layer sample diaphragm. Wherein σSThe ionic conductivity of the single-layer sample diaphragm is shown, L is the thickness of the sample diaphragm in the sample battery, and S is the area of the sample diaphragm corresponding to the positive plate in the sample battery. Please refer to fig. 3. In the present embodiment, the sample cell 10 includes a positive electrode sheet 11, and both surfaces of the positive electrode sheet 11 correspond to the sample separator 14. In this embodiment, if the size of the positive electrode sheet is 50mm × 76mm, the area S of the sample separator corresponding to the positive electrode sheet in the sample cell is 50 × 76 × 2 — 7600mm2。RSThe resistance of the single-layer sample separator was 41.00m Ω. The membrane thickness L is 20 μm. Thus, in this implementation scenario, the single layer sample membrane ionic conductivity σS＝L/(S*RS)＝20μm/(7600mm2*41.00mΩ)＝0.06418S/m。
S204: and calculating the total resistance value of the diaphragm to be detected of the battery to be detected according to the ion conductivity of the single-layer sample diaphragm and the total area of the diaphragm to be detected.
In the present implementation scenario, according to formula RS’＝L’/(S’*σS') calculating the total resistance value of the to-be-tested diaphragm of the to-be-tested battery. Wherein R isS' is total resistance value of the diaphragm to be measured of the battery to be measured, L ' is thickness of the diaphragm to be measured of the battery to be measured, S ' is total area of the diaphragm to be measured corresponding to the positive plate of the battery to be measured, and sigmaS' is the ionic conductivity of the diaphragm to be measured of the battery to be measured and the ionic conductivity sigma of the single-layer sample diaphragmSAre equal. In this implementation scenario, the size of the positive electrode sheet of the battery to be tested is 90mm × 275mm, the number of positive electrode sheets is 39, and the total area S' ═ 90 × 275 × 2 × 39 ═ 1930500mm of the separator to be tested corresponding to the positive electrode sheet of the battery to be tested2The thickness L of the diaphragm to be measured is 20 mu m, and the total resistance R of the diaphragm to be measured of the battery to be measuredS’＝L’/(S’*σS’)＝20μm/(1930500mm2*0.06418S/m)＝0.16mΩ。
In other implementation scenarios, the ionic conductivity and the thickness of the diaphragm to be tested of the battery to be tested and the sample diaphragm of the sample battery are the same, so that the total resistance of the diaphragm to be tested can be calculated according to the area ratio of the two diaphragms.
In the implementation scenario, for convenience of measurement and resource saving, the areas of the positive and negative electrode plates of the sample battery and the area of the sample diaphragm are both smaller than the areas of the positive and negative electrode plates of the battery to be measured and the area of the diaphragm to be measured.
As can be seen from the above description, in this embodiment, the internal resistance values of the sample battery with different numbers of sample diaphragm layers are measured, and the plurality of internal resistance values are linearly fitted, where the slope of the sample battery is the resistance value of the single-layer sample diaphragm, so that the resistance value of the single-layer sample diaphragm can be accurately calculated.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a battery separator resistance measuring device according to a first embodiment of the present invention. The battery diaphragm resistance value measuring device 20 provided by the invention comprises a measuring module 21, a first calculating module 22 and a second calculating module 23.
The measuring module 21 is configured to measure an internal resistance value of at least one sample battery, where each sample battery includes at least two layers of sample membranes, at least one sample battery has the same electrolyte as the battery to be measured, and the sample membrane has the same ionic conductivity as the battery to be measured. The first calculating module 22 is configured to calculate the ionic conductivity of the single-layer sample membrane according to the internal resistance value of the at least one sample cell and the number of sample membrane layers of the at least one sample cell. The second calculating module 23 is configured to calculate a resistance value of the to-be-measured diaphragm of the to-be-measured battery according to the ion conductivity of the single-layer sample diaphragm.
The measuring module 21 is further configured to measure at least one internal resistance value when each sample cell has different numbers of sample membranes.
The first calculation module 22 is further configured to perform linear fitting on the at least one internal resistance value to obtain a fitted straight line, where a slope of the fitted straight line is a resistance value of the single-layer sample separator of the sample battery.
The first calculating module 22 is further configured to calculate a fitting degree of the fitting straight line, and if the fitting degree is greater than a preset threshold, a slope of the fitting straight line is a resistance value of the single-layer sample membrane of the sample cell.
The first calculation module 22 is further configured to calculate an average value of the resistance values of the single-layer sample membranes of the at least one sample cell, and the average value is used as the resistance value of the single-layer membrane.
The second calculating module 23 is further configured to calculate a resistance value of the to-be-measured diaphragm of the to-be-measured battery according to the ion conductivity of the single-layer sample diaphragm and the total area of the to-be-measured diaphragm.
Each sample battery comprises a positive plate and two negative plates positioned on two sides of the positive plate, and at least one layer of sample diaphragm is arranged between the positive plate and each negative plate.
Wherein the area of the sample diaphragm is smaller than that of the diaphragm to be measured.
Wherein the number of layers of the sample separator of each sample cell is less than or equal to 5.
As can be seen from the above description, in this embodiment, the resistance value of the single-layer sample diaphragm is calculated by measuring the internal resistance value of the sample battery having the same electrolyte as the battery to be measured, and the sample diaphragm and the diaphragm to be measured have the same ionic conductivity, so that the ionic conductivity of the diaphragm to be measured can be obtained by calculating the ionic conductivity of the sample diaphragm, and thus the total resistance value of the diaphragm to be measured is calculated according to the ionic conductivity of the diaphragm to be measured, and the battery to be measured does not need to be damaged, and a special device is not needed, so that the measurement cost can be effectively reduced, and the measurement method is simple and the result.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a battery separator resistance measuring device according to a second embodiment of the present invention. The battery diaphragm resistance value measuring device 30 provided by the invention comprises a measuring circuit 31, a processor 32 and a memory 33. The processor 32 is coupled to the measurement circuit 31 and the memory 33. The memory 33 has stored therein a computer program which is executed by the processor 32 when in operation to implement the method as shown in fig. 1 and 2. The detailed methods can be referred to above and are not described herein.
As can be seen from the above description, in this embodiment, the resistance value of the single-layer sample diaphragm is calculated by measuring the internal resistance value of the sample battery having the same electrolyte as the battery to be measured, and the sample diaphragm and the diaphragm to be measured have the same ionic conductivity, so that the ionic conductivity of the diaphragm to be measured can be obtained by calculating the ionic conductivity of the sample diaphragm, and thus the total resistance value of the diaphragm to be measured is calculated according to the ionic conductivity of the diaphragm to be measured, and the battery to be measured does not need to be damaged, and a special device is not needed, so that the measurement cost can be effectively reduced, and the measurement method is simple and the result.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an embodiment of a computer-readable storage medium provided in the present application. The computer-readable storage medium 40 stores at least one computer program 41, and the computer program 41 is used for being executed by a processor to implement the method shown in fig. 1 and fig. 2, and the detailed method can be referred to above and is not described herein again. In one embodiment, the computer readable storage medium 40 may be a memory chip in a terminal, a hard disk, or other readable and writable storage tool such as a removable hard disk, a flash disk, an optical disk, or the like, and may also be a server or the like.
As can be seen from the above description, the computer program stored in the computer-readable storage medium in this embodiment may be used to measure the internal resistance of a sample battery having the same electrolyte as the battery to be measured, calculate the resistance of a single-layer sample diaphragm, calculate the ionic conductivity of the sample diaphragm, where the sample diaphragm and the diaphragm to be measured have the same ionic conductivity, and calculate the total resistance of the diaphragm to be measured according to the ionic conductivity of the sample diaphragm, without damaging the battery to be measured or using a special device, so that the measurement cost may be effectively reduced, the measurement method is simple, and the result is accurate.
Different from the prior art, the resistance value of the single-layer sample diaphragm in the sample battery is calculated by measuring the internal resistance value of at least one sample battery, the at least one sample battery has the same electrolyte as the battery to be measured, and the sample diaphragm has the same ionic conductivity as the diaphragm to be measured, so that the total resistance value of the diaphragm to be measured is calculated according to the resistance value of the single-layer sample, the total resistance value of the diaphragm to be measured in the electrolyte of the battery to be measured can be accurately measured, the battery to be measured does not need to be damaged, special equipment is not needed, the measurement cost can be effectively reduced, the measurement method is simple, and the result is accurate.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. A battery separator resistance measurement method, characterized in that the method comprises:
measuring an internal resistance value of at least one sample cell, each of the sample cells including at least one layer of a sample membrane;
calculating the ionic conductivity of the single-layer sample diaphragm according to the internal resistance value of the at least one sample battery and the number of the sample diaphragm layers;
calculating the total resistance value of the to-be-measured diaphragm of the to-be-measured battery according to the ionic conductivity of the single-layer sample diaphragm;
the sample diaphragm and the diaphragm to be tested of the battery to be tested have the same ionic conductivity, and the at least one sample battery has the same electrolyte as the battery to be tested.
2. The battery separator resistance value measuring method according to claim 1, wherein the step of measuring the internal resistance value of at least one sample battery includes:
adjusting the number of layers of a sample diaphragm of each sample battery, and measuring at least one internal resistance value when each sample battery has different numbers of layers of sample diaphragms;
the step of calculating the ionic conductivity of the single-layer sample diaphragm according to the internal resistance value of the at least one sample battery and the number of the sample diaphragm layers, which the sample diaphragm has, includes:
performing linear fitting on the at least one internal resistance value and the number of the sample diaphragm layers corresponding to the internal resistance value to obtain a fitting straight line, wherein the slope of the fitting straight line is the resistance value of the single-layer sample diaphragm of the sample battery;
and calculating the ionic conductivity of the single-layer sample diaphragm according to the resistance value of the single-layer sample diaphragm and the area of the single-layer sample diaphragm.
3. The battery separator resistance value measuring method according to claim 2, wherein the step of linearly fitting the at least one internal resistance value to obtain a fitted straight line is followed by:
and calculating the fitting degree of the fitting straight line, wherein if the fitting degree is greater than a preset threshold value, the slope of the fitting straight line is the resistance value of the single-layer sample diaphragm of the sample battery.
4. The battery separator resistance value measuring method according to claim 2, wherein the step of calculating the ionic conductivity of the single-layer sample separator from the resistance value of the single-layer sample separator and the area of the single-layer sample separator is preceded by:
calculating a mean value of the resistance values of the single-layer sample membranes of the at least one sample cell, and taking the mean value as the resistance value of the single-layer sample membranes.
5. The method for measuring the resistance of the battery separator according to claim 1, wherein the step of calculating the total resistance of the separator to be measured of the battery to be measured according to the ionic conductivity of the single-layer sample separator comprises the following steps:
and calculating the total resistance value of the diaphragm to be detected of the battery to be detected according to the ion conductivity of the single-layer sample diaphragm and the total area of the diaphragm to be detected.
6. The battery separator resistance value measuring method according to claim 1,
each sample battery comprises a positive plate and two negative plates positioned on two sides of the positive plate, and at least one layer of sample diaphragm is arranged between the positive plate and each negative plate.
7. The battery separator resistance value measuring method according to claim 1,
the area of the sample diaphragm is smaller than that of the diaphragm to be measured.
8. The battery separator resistance value measuring method according to claim 1,
the number of layers of the sample separator of each sample cell is less than or equal to 5.
9. A battery separator resistance measurement device, comprising:
the measuring module is used for measuring the internal resistance value of at least one sample battery, and each sample battery comprises at least one layer of sample diaphragm;
the first calculation module is used for calculating the ionic conductivity of a single-layer sample diaphragm according to the internal resistance value of the at least one sample battery and the number of sample diaphragm layers;
the second calculation module is used for calculating the total resistance value of the to-be-measured diaphragm of the to-be-measured battery according to the ionic conductivity of the single-layer sample diaphragm;
the sample diaphragm and the diaphragm to be tested of the battery to be tested have the same ionic conductivity, and the at least one sample battery has the same electrolyte as the battery to be tested.
10. A battery separator resistance measurement device, comprising: measurement circuitry, a processor, a memory, the processor being coupled to the memory and the measurement circuitry, the memory having stored therein a computer program, the processor executing the computer program to implement the method of any of claims 1-8.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113687144A (en) * | 2021-07-30 | 2021-11-23 | 蜂巢能源科技有限公司 | Testing device and testing method for diaphragm ionic conductivity |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998534A (en) * | 2012-11-20 | 2013-03-27 | 深圳市星源材质科技股份有限公司 | Membrane surface resistance test method of lithium ion battery |
| CN105158566A (en) * | 2015-08-12 | 2015-12-16 | 深圳市星源材质科技股份有限公司 | Test device and method for closed-pore film rupture temperature and ion conductivity of cell diaphragm |
| CN106370930A (en) * | 2016-09-23 | 2017-02-01 | 深圳市沃特玛电池有限公司 | Lithium ion battery separator electrical performance testing device and method |
| CN106707024A (en) * | 2015-11-16 | 2017-05-24 | 贵州安达科技能源股份有限公司 | Test sample used for testing relative internal resistance of electrode material and test method used for testing relative internal resistance of electrode material |
| CN108110342A (en) * | 2017-12-29 | 2018-06-01 | 山东精工电子科技有限公司 | A kind of lithium battery diaphragm and electrolyte matching detection device and method |
| CN108318822A (en) * | 2017-12-18 | 2018-07-24 | 合肥国轩高科动力能源有限公司 | A kind of measurement method and system of lithium battery pole slice and diaphragm conductivity |
| CN110018348A (en) * | 2018-01-09 | 2019-07-16 | 中天储能科技有限公司 | Lithium battery internal resistance measurement method and device |
| CN209640464U (en) * | 2018-12-29 | 2019-11-15 | 深圳市比克动力电池有限公司 | Battery diaphragm electrical property measuring device |
-
2019
- 2019-11-18 CN CN201911129457.1A patent/CN111220850A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998534A (en) * | 2012-11-20 | 2013-03-27 | 深圳市星源材质科技股份有限公司 | Membrane surface resistance test method of lithium ion battery |
| CN105158566A (en) * | 2015-08-12 | 2015-12-16 | 深圳市星源材质科技股份有限公司 | Test device and method for closed-pore film rupture temperature and ion conductivity of cell diaphragm |
| CN106707024A (en) * | 2015-11-16 | 2017-05-24 | 贵州安达科技能源股份有限公司 | Test sample used for testing relative internal resistance of electrode material and test method used for testing relative internal resistance of electrode material |
| CN106370930A (en) * | 2016-09-23 | 2017-02-01 | 深圳市沃特玛电池有限公司 | Lithium ion battery separator electrical performance testing device and method |
| CN108318822A (en) * | 2017-12-18 | 2018-07-24 | 合肥国轩高科动力能源有限公司 | A kind of measurement method and system of lithium battery pole slice and diaphragm conductivity |
| CN108110342A (en) * | 2017-12-29 | 2018-06-01 | 山东精工电子科技有限公司 | A kind of lithium battery diaphragm and electrolyte matching detection device and method |
| CN110018348A (en) * | 2018-01-09 | 2019-07-16 | 中天储能科技有限公司 | Lithium battery internal resistance measurement method and device |
| CN209640464U (en) * | 2018-12-29 | 2019-11-15 | 深圳市比克动力电池有限公司 | Battery diaphragm electrical property measuring device |
Non-Patent Citations (2)
| Title |
|---|
| 冯玲等: "湿法无纺布型锂离子电池隔膜研究", 《膜科学与技术》 * |
| 杨书庭等: "Al2O3/PTFE杂化涂层改性聚乙烯隔膜", 《电源技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113687144A (en) * | 2021-07-30 | 2021-11-23 | 蜂巢能源科技有限公司 | Testing device and testing method for diaphragm ionic conductivity |
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