CN113884883B - Correction method and device for direct current internal resistance in lithium ion battery cycle - Google Patents
Correction method and device for direct current internal resistance in lithium ion battery cycle Download PDFInfo
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000012937 correction Methods 0.000 title claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 10
- 101100100119 Homo sapiens TNFRSF10C gene Proteins 0.000 claims abstract description 7
- 101100121770 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GID8 gene Proteins 0.000 claims abstract description 7
- 101100009020 Schizosaccharomyces pombe (strain 972 / ATCC 24843) dcr1 gene Proteins 0.000 claims abstract description 7
- 102100040115 Tumor necrosis factor receptor superfamily member 10C Human genes 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims description 40
- 238000000691 measurement method Methods 0.000 claims description 13
- 230000003442 weekly effect Effects 0.000 claims description 8
- 101100009017 Caenorhabditis elegans dcr-1 gene Proteins 0.000 claims description 6
- 101100009019 Drosophila melanogaster Dcr-1 gene Proteins 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a correction method and a device of direct current internal resistance in lithium ion battery circulation, wherein the method comprises the following steps: acquiring a first cycle of the DC internal resistance DCR1 and a corresponding temperature value T1, and an N cycle of the DC internal resistance DCRN and a corresponding temperature value TN of all experimental batteries tested at the same temperature; calculating the DCR growth rate and the temperature change value; performing curve fitting on the DCR growth rate and the temperature change value of all experimental batteries to obtain a relational expression of the temperature change value and the DCR growth rate; correcting the direct current internal resistance of the nth cycle of the experimental battery to be the same as the direct current internal resistance of the first cycle according to the relation; calculating to obtain the direct current internal resistance of all the experimental batteries after temperature correction; the invention has the advantages that: the influence of temperature on the measurement of the direct current internal resistance is reduced, and the accuracy of the calculation result is improved.
Description
Technical Field
The invention relates to the field of lithium ion battery testing, in particular to a method and a device for correcting direct current internal resistance in lithium ion battery circulation.
Background
The lithium ion battery has the advantages of high energy density, long cycle life and the like, and is widely applied to the fields of portable electronic products, electric automobiles and the like. The direct current internal resistance is one of important electrical properties of the lithium ion battery, is abbreviated as DCR, is an important index for evaluating the performance of the lithium ion battery, and directly affects the power performance and the cycle life of the lithium ion battery. It is therefore necessary to test the DCR of lithium ion batteries.
At present, DCR of a lithium ion battery is generally tested independently before and after the cycle of the lithium ion battery, the traditional method is to stop and take down the cycle of the battery, place the battery under specific conditions to independently perform DCR test, and then re-perform charge and discharge cycle test on the battery after the DCR test is completed, thus the operation is troublesome. Chinese patent publication No. CN111525202a discloses a method, a system, a device and a medium for monitoring DCR in a lithium ion battery cycle, where the monitoring method includes obtaining data in a lithium ion battery charging and discharging cycle, including time, and voltage value, temperature and charging and discharging current value of the lithium ion battery at corresponding time in the charging and discharging process, and extracting test data of a plurality of charging and discharging cycles from the data, including voltage value, current value in a period of time when charging starts, and voltage value and current value in a period of time before discharging starts; the discharging DCR and the charging DCR are derived from the DCR calculation formula. The technical scheme of the patent application can better know the variation trend of the charge DCR and the discharge DCR of the lithium ion battery in the circulation process, identify the risk of abnormal performance of the battery cell in advance, and save time cost and test cost to a certain extent. Research shows that the internal resistance of a battery is influenced by temperature and state of charge (SOC), and therefore, the internal resistance test should be measured under the same state of charge and temperature environment. However, the DCR test method does not consider the influence of temperature on the measurement of DCR, so that the DCR calculation result is not accurate enough.
Disclosure of Invention
The technical problem to be solved by the invention is that the DCR measurement method in the prior art does not consider the influence of temperature on the measurement of DCR, so that the DCR calculation result is not accurate enough.
The invention solves the technical problems by the following technical means: the method for correcting the direct current internal resistance in the cycle of the lithium ion battery comprises the following steps:
step one: obtaining a first cycle of DC internal resistance DCR1 and a corresponding temperature value T1, and an Nth cycle of DC internal resistance DCRN and a corresponding temperature value TN of all experimental batteries tested at the same temperature by using a lithium ion battery DC resistance measurement method;
step two: calculating the DCR growth rate and the temperature change value;
step three: performing curve fitting on the DCR growth rate and the temperature change value of all experimental batteries to obtain a relational expression of the temperature change value and the DCR growth rate;
step four: correcting the direct current internal resistance of the nth cycle of the experimental battery to be the same as the direct current internal resistance of the first cycle according to the relation;
step five: and calculating to obtain the direct current internal resistance of all the experimental batteries after temperature correction.
According to the invention, the relation between the temperature change value and the DCR increase rate is obtained by performing curve fitting on the DCR increase rate and the temperature change value of all the experimental batteries, and the direct current internal resistance of the experimental batteries is corrected to the direct current internal resistance at the same temperature, so that the influence of the temperature on the measurement of the direct current internal resistance can be reduced, and the accuracy of the calculation result is improved.
Further, the method for measuring the direct current resistance of the lithium ion battery comprises the following steps:
s11, selecting a group of experimental batteries, and performing charge and discharge test on the batteries at the same temperature;
s12, acquiring data in a charge-discharge cycle of the lithium ion battery, wherein the data comprise time, and a voltage value, a temperature and a charge-discharge current value of the lithium ion battery at corresponding time in a charge-discharge process;
s13, extracting test data of a plurality of charge-discharge cycles from the acquired data, wherein the test data of each charge-discharge cycle comprises a last voltage value U1 before discharge starts, a voltage value U2 at the tail end of a discharge time period t and a discharge current value I;
s14, calculating the direct current internal resistance of the lithium ion battery in weekly cycle, wherein the calculation formula is as follows:
dcr= (U1-U2)/I, the weekly cycle represents each charge-discharge cycle.
Further, the constant current continuous discharge is performed in the discharge time period t in the charge-discharge cycle.
Further, the method for measuring the direct current resistance of the lithium ion battery further comprises the following steps: and obtaining the change trend of the direct current internal resistance according to the calculated direct current internal resistances of different cycle numbers.
Further, the raw materials, the process parameters and the manufacturing batch of the experimental batteries are the same.
Further, the temperature range for the test at the same temperature is-25 to 45 ℃.
Further, the calculation formulas of the temperature change value and the DCR increase rate are as follows:
temperature change value x=tn-T1
DCR increase rate y= (DCRN-DCR 1)/DCR 1 x 100%.
Further, the relation between the temperature change value and the DCR growth rate is y=ax+b, where a is a slope, b is an intercept, and both are constants.
Further, the fourth step includes:
correcting the temperature of the nth cycle of the experimental battery to be the temperature of the first cycle, substituting the temperature change value x into a relation between the temperature change value x and the DCR growth rate to obtain the DCR growth rate b, obtaining the direct current internal resistance of the first cycle by using a lithium ion battery direct current resistance measurement method, and increasing the direct current internal resistance of the first cycle according to the DCR growth rate b to obtain the direct current internal resistance of the nth cycle, so that the direct current internal resistance of the nth cycle of the experimental battery is corrected to be the direct current internal resistance which is the same as the direct current internal resistance of the first cycle when the temperature of the nth cycle is equal to the temperature of the first cycle.
The invention also provides a correction device of direct current internal resistance in the lithium ion battery cycle, which comprises:
the direct current internal resistance measurement module is used for acquiring the first cycle direct current internal resistance DCR1 and the corresponding temperature value T1, and the Nth cycle direct current internal resistance DCRN and the corresponding temperature value TN of all experimental batteries tested at the same temperature by using a lithium ion battery direct current resistance measurement method;
the parameter calculation module is used for calculating the DCR growth rate and the temperature change value;
the relation acquisition module is used for performing curve fitting on the DCR growth rate and the temperature change value of all the experimental batteries to obtain a relation between the temperature change value and the DCR growth rate;
the correction module is used for correcting the direct current internal resistance of the nth cycle of the experimental battery to be the same as the direct current internal resistance of the first cycle according to the relation;
and the correction result output module is used for calculating the direct current internal resistance of all the experimental batteries after temperature correction.
Further, the method for measuring the direct current resistance of the lithium ion battery comprises the following steps:
s11, selecting a group of experimental batteries, and performing charge and discharge test on the batteries at the same temperature;
s12, acquiring data in a charge-discharge cycle of the lithium ion battery, wherein the data comprise time, and a voltage value, a temperature and a charge-discharge current value of the lithium ion battery at corresponding time in a charge-discharge process;
s13, extracting test data of a plurality of charge-discharge cycles from the acquired data, wherein the test data of each charge-discharge cycle comprises a last voltage value U1 before discharge starts, a voltage value U2 at the tail end of a discharge time period t and a discharge current value I;
s14, calculating the direct current internal resistance of the lithium ion battery in weekly cycle, wherein the calculation formula is as follows:
dcr= (U1-U2)/I, the weekly cycle represents each charge-discharge cycle.
Further, the constant current continuous discharge is performed in the discharge time period t in the charge-discharge cycle.
Further, the method for measuring the direct current resistance of the lithium ion battery further comprises the following steps: and obtaining the change trend of the direct current internal resistance according to the calculated direct current internal resistances of different cycle numbers.
Further, the raw materials, the process parameters and the manufacturing batch of the experimental batteries are the same.
Further, the temperature range for the test at the same temperature is-25 to 45 ℃.
Further, the calculation formulas of the temperature change value and the DCR increase rate are as follows:
temperature change value x=tn-T1
DCR increase rate y= (DCRN-DCR 1)/DCR 1 x 100%.
Further, the relation between the temperature change value and the DCR growth rate is y=ax+b, where a is a slope, b is an intercept, and both are constants.
Further, the correction module is further configured to:
correcting the temperature of the nth cycle of the experimental battery to be the temperature of the first cycle, substituting the temperature change value x into a relation between the temperature change value x and the DCR growth rate to obtain the DCR growth rate b, obtaining the direct current internal resistance of the first cycle by using a lithium ion battery direct current resistance measurement method, and increasing the direct current internal resistance of the first cycle according to the DCR growth rate b to obtain the direct current internal resistance of the nth cycle, so that the direct current internal resistance of the nth cycle of the experimental battery is corrected to be the direct current internal resistance which is the same as the direct current internal resistance of the first cycle when the temperature of the nth cycle is equal to the temperature of the first cycle.
The invention has the advantages that:
(1) According to the invention, the relation between the temperature change value and the DCR increase rate is obtained by performing curve fitting on the DCR increase rate and the temperature change value of all the experimental batteries, and the direct current internal resistance of the experimental batteries is corrected to the direct current internal resistance at the same temperature, so that the influence of the temperature on the measurement of the direct current internal resistance can be reduced, and the accuracy of the calculation result is improved.
(2) In the invention, in the charge and discharge cycle of the battery, the DCR is obtained through the data calculation in the discharge process, the step of independently carrying out the DCR test is omitted, the test time is saved, and the change trend of the DCR is further estimated.
Drawings
Fig. 1 is a discharge curve of a lithium ion battery in a method for correcting direct current internal resistance in a lithium ion battery cycle according to an embodiment of the present invention;
fig. 2 is a correction curve of DCR growth rate in the method for correcting dc internal resistance in lithium ion battery cycle according to the embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The method for correcting the direct current internal resistance in the cycle of the lithium ion battery comprises the following steps:
firstly, measuring the direct current internal resistance, and then correcting the direct current internal resistance, wherein the measuring process is as follows:
s11, selecting 7 experimental batteries as a group, and performing charge and discharge tests on the 7 batteries at the same temperature;
s12, acquiring data in the charge-discharge cycle process of the lithium ion battery, wherein the data comprise time, and a voltage value, a temperature and a discharge current value of the lithium ion battery at corresponding time in the charge-discharge process;
s13, extracting test data of two charge-discharge cycles from the data obtained in the step S1, wherein the test data of each charge-discharge cycle comprises a last voltage value U1 before discharge starts, a voltage value U2 at the tail end of a discharge time period T, a discharge current value I and a corresponding temperature T;
s14, calculating DCR of the lithium ion battery, wherein the calculation formula is as follows:
dcr= (U1-U2)/I, the discharge curve of the lithium ion battery is shown in fig. 1.
In the process of extracting test data in this embodiment, data is obtained every 0.1 second.
In the test data extracted in this embodiment, the discharge period t is 30 seconds.
In the test data extracted in this example, the number of cycles was selected from weeks 1 and 100.
In the test data extracted in this example, the lithium ion battery test temperature was selected to be 25 ℃ and the actual temperature range was 25±1 ℃.
The calculation results are shown in table 1 below. The DCR values in table 1 below are values obtained from testing a particular lithium ion battery under particular environmental conditions, for reference only, and those skilled in the art will appreciate that the values obtained may vary from test environment to test subject.
It should be understood that the time period values, the current values, the voltage values, the cycle numbers corresponding to the extracted test data, and the like in the specific application examples are only examples, and should not impose any limitation on the execution of the steps in the embodiments of the present invention, and those skilled in the art may use different values as required.
Table 1 DCR measurement results for all cells
Based on the DCR measurement method, the present embodiment provides a method for correcting DCR in a lithium ion battery cycle process, including the following steps:
s21, acquiring DCR1 and corresponding temperature value T1 of the 1 st cycle, DCR100 and corresponding temperature value T100 of the 100 th cycle of 7 experimental batteries by using a lithium ion battery direct current resistance measurement method, wherein test data are shown in Table 2;
s22, calculating a DCR growth rate and a temperature change value, wherein the calculation formula is as follows:
temperature change value (x) =t100—t1
DCR increase rate (y) = (DCR 100-DCR 1)/DCR 1 x 100%
S23, performing curve fitting on the DCR growth rate and the temperature change value of 7 experimental batteries to obtain a relational expression: y=ax+b;
s24, correcting the DCR increase rate of the 100 th cycle of the experimental battery to be the DCR increase rate when the temperature of the first cycle is the same according to the relation;
s25, calculating to obtain the DCR after temperature correction.
Table 2 test data for cycle 1 and cycle 100 of the battery
From table 2, a fitted curve y= -0.0242x+0.0082 can be made, as shown in fig. 2.
According to the fitted curve, the actual value of the increase rate of the direct current internal resistance is 0.82% when the temperature is kept unchanged. Thus, as shown in table 3, the temperature-corrected DCR at 100 cycles of each battery was calculated at a rate of increase of 0.82% for DCR at the first cycle, for example, the temperature of 1# battery at 100 cycles was corrected to the temperature at the first cycle, that is, 25.7 ℃, at which the temperature change value x from the first cycle to the 100 th cycle was 0, the rate of increase of DCR from the first cycle to the 100 th cycle was calculated as 0.0082 according to the formula y= -0.0242x+0.0082, and as shown in table 2, the DCR at the first cycle was 1.282, and then the DCR at the 100 th cycle was 1.282 × (1+0.0082) =1.293, by which the temperature-corrected DCR at the 100 cycles of all batteries could be calculated, respectively.
Table 3 temperature corrected DCR for all cells at 100 cycles
| Battery numbering | Cycle number of weeks | Correcting temperature (DEG C) | Correcting DCR (mΩ) |
| 1# | 100 | 25.7 | 1.293 |
| 2# | 100 | 25.4 | 1.279 |
| 3# | 100 | 25.4 | 1.294 |
| 4# | 100 | 25.1 | 1.276 |
| 5# | 100 | 25.0 | 1.293 |
| 6# | 100 | 24.4 | 1.315 |
| 7# | 100 | 25.7 | 1.268 |
Through the technical scheme, the DCR growth rate and the temperature change value of all experimental batteries are subjected to curve fitting to obtain the relational expression of the temperature change value and the DCR growth rate, and the direct-current internal resistance of the experimental batteries is corrected to the direct-current internal resistance at the same temperature, so that the influence of the temperature on the measurement of the direct-current internal resistance can be reduced, and the accuracy of a calculation result is improved.
Example 2
Based on embodiment 1, embodiment 2 of the present invention further provides a device for correcting internal dc resistance in a lithium ion battery cycle, the device comprising:
the direct current internal resistance measurement module is used for acquiring the first cycle direct current internal resistance DCR1 and the corresponding temperature value T1, and the Nth cycle direct current internal resistance DCRN and the corresponding temperature value TN of all experimental batteries tested at the same temperature by using a lithium ion battery direct current resistance measurement method;
the parameter calculation module is used for calculating the DCR growth rate and the temperature change value;
the relation acquisition module is used for performing curve fitting on the DCR growth rate and the temperature change value of all the experimental batteries to obtain a relation between the temperature change value and the DCR growth rate;
the correction module is used for correcting the direct current internal resistance of the nth cycle of the experimental battery to be the same as the direct current internal resistance of the first cycle according to the relation;
and the correction result output module is used for calculating the direct current internal resistance of all the experimental batteries after temperature correction.
Specifically, the method for measuring the direct current resistance of the lithium ion battery comprises the following steps:
s11, selecting a group of experimental batteries, and performing charge and discharge test on the batteries at the same temperature;
s12, acquiring data in a charge-discharge cycle of the lithium ion battery, wherein the data comprise time, and a voltage value, a temperature and a charge-discharge current value of the lithium ion battery at corresponding time in a charge-discharge process;
s13, extracting test data of a plurality of charge-discharge cycles from the acquired data, wherein the test data of each charge-discharge cycle comprises a last voltage value U1 before discharge starts, a voltage value U2 at the tail end of a discharge time period t and a discharge current value I;
s14, calculating the direct current internal resistance of the lithium ion battery in weekly cycle, wherein the calculation formula is as follows:
dcr= (U1-U2)/I, the weekly cycle represents each charge-discharge cycle.
More specifically, the discharge time period t in the charge-discharge cycle is constant-current continuous discharge.
More specifically, the method for measuring the direct current resistance of the lithium ion battery further comprises the following steps: and obtaining the change trend of the direct current internal resistance according to the calculated direct current internal resistances of different cycle numbers.
Specifically, the raw materials, the process parameters and the manufacturing batch of the experimental battery are the same.
Specifically, the temperature range for testing at the same temperature is-25-45 ℃.
Specifically, the calculation formulas of the temperature change value and the DCR increase rate are as follows:
temperature change value x=tn-T1
DCR increase rate y= (DCRN-DCR 1)/DCR 1 x 100%.
More specifically, the relation between the temperature change value and the DCR growth rate is y=ax+b, where a is a slope, b is an intercept, and both are constants.
Specifically, the correction module is further configured to:
correcting the temperature of the nth cycle of the experimental battery to be the temperature of the first cycle, substituting the temperature change value x into a relation between the temperature change value x and the DCR growth rate to obtain the DCR growth rate b, obtaining the direct current internal resistance of the first cycle by using a lithium ion battery direct current resistance measurement method, and increasing the direct current internal resistance of the first cycle according to the DCR growth rate b to obtain the direct current internal resistance of the nth cycle, so that the direct current internal resistance of the nth cycle of the experimental battery is corrected to be the direct current internal resistance which is the same as the direct current internal resistance of the first cycle when the temperature of the nth cycle is equal to the temperature of the first cycle.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The method for correcting the direct current internal resistance in the lithium ion battery cycle is characterized by comprising the following steps of:
step one: obtaining a first cycle of DC internal resistance DCR1 and a corresponding temperature value T1, and an Nth cycle of DC internal resistance DCRN and a corresponding temperature value TN of all experimental batteries tested at the same temperature by using a lithium ion battery DC resistance measurement method;
step two: calculating the DCR growth rate and the temperature change value;
step three: performing curve fitting on the DCR growth rate and the temperature change value of all experimental batteries to obtain a relational expression of the temperature change value and the DCR growth rate; the calculation formulas of the temperature change value and the DCR growth rate are as follows:
temperature change value x=tn-T1
DCR increase rate y= (DCRN-DCR 1)/DCR 1 100%;
the relation between the temperature change value and the DCR growth rate is y=ax+b, wherein a is a slope, b is an intercept, and both are constants;
step four: correcting the direct current internal resistance of the nth cycle of the experimental battery to be the same as the direct current internal resistance of the first cycle according to the relation; the specific process is as follows:
correcting the temperature of the nth cycle of the experimental battery to be the temperature of the first cycle, substituting the temperature change value x into a relation between the temperature change value x and the DCR growth rate to obtain a DCR growth rate b, acquiring the direct current internal resistance of the first cycle by using a lithium ion battery direct current resistance measurement method, and increasing the direct current internal resistance of the first cycle according to the DCR growth rate b to obtain the direct current internal resistance of the nth cycle, so that the direct current internal resistance of the nth cycle of the experimental battery is corrected to be the direct current internal resistance which is the same as the direct current internal resistance of the first cycle when the temperature of the nth cycle is the same;
step five: and calculating to obtain the direct current internal resistance of all the experimental batteries after temperature correction.
2. The method for correcting the internal resistance of direct current in the cycle of a lithium ion battery according to claim 1, wherein the method for measuring the direct current resistance of the lithium ion battery is as follows:
s11, selecting a group of experimental batteries, and performing charge and discharge test on the batteries at the same temperature;
s12, acquiring data in a charge-discharge cycle of the lithium ion battery, wherein the data comprise time, and a voltage value, a temperature and a charge-discharge current value of the lithium ion battery at corresponding time in a charge-discharge process;
s13, extracting test data of a plurality of charge-discharge cycles from the acquired data, wherein the test data of each charge-discharge cycle comprises a last voltage value U1 before discharge starts, a voltage value U2 at the tail end of a discharge time period t and a discharge current value I;
s14, calculating the direct current internal resistance of the lithium ion battery in weekly cycle, wherein the calculation formula is as follows:
dcr= (U1-U2)/I, the weekly cycle represents each charge-discharge cycle.
3. The method for correcting the internal resistance of direct current in the cycle of a lithium ion battery according to claim 2, wherein the discharge time period t in the charge-discharge cycle is constant current continuous discharge.
4. The method for correcting internal dc resistance in a lithium ion battery cycle according to claim 2, wherein the method for measuring the internal dc resistance of the lithium ion battery further comprises: and obtaining the change trend of the direct current internal resistance according to the calculated direct current internal resistances of different cycle numbers.
5. The method for correcting internal resistance of direct current in a lithium ion battery cycle according to claim 1, wherein the raw materials, the process parameters and the manufacturing batch of the experimental battery are the same.
6. The method for correcting internal resistance of direct current in a lithium ion battery cycle according to claim 1, wherein the temperature range for testing at the same temperature is-25 to 45 ℃.
7. The device for correcting the direct current internal resistance in the lithium ion battery cycle is characterized by comprising the following components:
the direct current internal resistance measurement module is used for acquiring the first cycle direct current internal resistance DCR1 and the corresponding temperature value T1, and the Nth cycle direct current internal resistance DCRN and the corresponding temperature value TN of all experimental batteries tested at the same temperature by using a lithium ion battery direct current resistance measurement method;
the parameter calculation module is used for calculating the DCR growth rate and the temperature change value;
the relation acquisition module is used for performing curve fitting on the DCR growth rate and the temperature change value of all the experimental batteries to obtain a relation between the temperature change value and the DCR growth rate; the calculation formulas of the temperature change value and the DCR growth rate are as follows:
temperature change value x=tn-T1
DCR increase rate y= (DCRN-DCR 1)/DCR 1 100%;
the relation between the temperature change value and the DCR growth rate is y=ax+b, wherein a is a slope, b is an intercept, and both are constants;
the correction module is used for correcting the direct current internal resistance of the nth cycle of the experimental battery to be the same as the direct current internal resistance of the first cycle according to the relation; the method is particularly used for:
correcting the temperature of the nth cycle of the experimental battery to be the temperature of the first cycle, substituting the temperature change value x into a relation between the temperature change value x and the DCR growth rate to obtain a DCR growth rate b, acquiring the direct current internal resistance of the first cycle by using a lithium ion battery direct current resistance measurement method, and increasing the direct current internal resistance of the first cycle according to the DCR growth rate b to obtain the direct current internal resistance of the nth cycle, so that the direct current internal resistance of the nth cycle of the experimental battery is corrected to be the direct current internal resistance which is the same as the direct current internal resistance of the first cycle when the temperature of the nth cycle is the same;
and the correction result output module is used for calculating the direct current internal resistance of all the experimental batteries after temperature correction.
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