CN111525202A - Method, system, equipment and medium for monitoring DCR in lithium ion battery cycle - Google Patents
Method, system, equipment and medium for monitoring DCR 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 114
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 72
- 238000012544 monitoring process Methods 0.000 title claims abstract description 39
- 238000007599 discharging Methods 0.000 claims abstract description 109
- 238000012360 testing method Methods 0.000 claims abstract description 52
- 230000008569 process Effects 0.000 claims abstract description 39
- 238000004364 calculation method Methods 0.000 claims abstract description 15
- 230000008859 change Effects 0.000 claims abstract description 13
- 230000001351 cycling effect Effects 0.000 claims description 19
- 238000004590 computer program Methods 0.000 claims description 10
- 238000013075 data extraction Methods 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 238000009825 accumulation Methods 0.000 description 12
- 230000010287 polarization Effects 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000007086 side reaction Methods 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 4
- 230000036541 health Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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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 method, a system, equipment and a medium for monitoring DCR (direct current rating) in lithium ion battery cycles, wherein the monitoring method comprises the steps of obtaining data in the charge and discharge cycles of a lithium ion battery, including time, voltage values and charge and discharge current values of the lithium ion battery at corresponding time in the charge and discharge process, and extracting test data of a plurality of charge and discharge cycles from the data, including the voltage values and the current values in a period of time when charging starts, and the voltage values and the current values in a period of time before discharging starts; and obtaining the discharging DCR and the charging DCR according to the DCR calculation formula. The technical scheme of the invention can better understand the change trends of charging DCR and discharging DCR of the lithium ion battery in the circulation process, identify the risk of abnormal cell performance in advance, and save time cost and test cost to a certain extent.
Description
Technical Field
The invention belongs to the technical field of lithium ion battery testing, and particularly relates to a method, a system, equipment and a medium for monitoring DCR in lithium ion battery circulation.
Background
The lithium ion battery technology is still continuously innovated and developed since birth, and the reason for this is: at present, the lithium ion battery has core problems of low energy density, short cycle life, poor safety performance, high cost and the like, and the development speed of the lithium ion battery industry is restricted, so that the lithium ion battery industry has a plurality of problems to be solved, but the development prospect of the lithium ion battery is still viewed all over the world along with the trend of global automobile electromotion, energy storage, household electromotion and the like.
The direct current internal resistance is one of important electrical properties of the lithium ion battery, and the direct current internal resistance of the lithium ion battery is called DCR for short, and comprises charging DCR and discharging DCR, and is an important index for evaluating the performance of the lithium ion battery, and the energy density and the cycle life of the lithium ion battery are directly influenced. The battery with larger DCR generates larger heat, thereby influencing the safety performance of the lithium ion battery when in use, and therefore, the DCR of the lithium ion battery is necessary to be tested.
Both discharging DCR and charging DCR are important performance indicators of lithium ion batteries. The charging DCR reflects the charging polarization and the charging heat production capacity of the battery cell, and the discharging DCR reflects the polarization and the heat production capacity of the discharging state of the battery cell. The DCR in the non-circulation process is the short-term DCR of the battery cell, because the time is short, the polarization accumulation, the side reaction accumulation and the like are less, the circulation DCR reflects the long-term DCR of the battery cell, and is the comprehensive condition of the ohmic internal resistance, the polarization accumulation, the side reaction accumulation, the pole piece health state and the like of the battery cell, and if the DCR has sudden change, the DCR is always accompanied with the deterioration of the circulation performance.
At present, the DCR of the lithium ion battery is generally tested independently before 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 a specific condition to carry out the DCR test independently, and after the DCR test is finished, carry out the charge-discharge cycle test again on the battery, so that the DCR change condition in the cycle process of the battery cannot be monitored continuously, and the DCR change trend in the cycle process of the lithium ion battery becomes very difficult to study.
Disclosure of Invention
The invention aims to solve the technical problem that the DCR of a battery cannot be conveniently tested in the prior art, and provides a method, a system, equipment and a medium for monitoring the DCR in the cycle of a lithium ion battery.
The invention solves the technical problems through the following technical scheme:
a method for monitoring DCR in a lithium ion battery cycle process comprises the following steps:
s1, acquiring data in the charge and discharge cycle of the lithium ion battery, wherein the data comprises time, and the voltage value and the charge and discharge current value of the lithium ion battery at corresponding time in the charge and discharge process;
s2, extracting test data of a plurality of charge and discharge cycles from the data acquired in the step S1, wherein the test data of each charge and discharge cycle comprise a last voltage value V1 before the charging starts, a voltage value V2 at the end of a charging first time period t1, a charging current value I1, a last voltage value V3 before the discharging starts, a voltage value V4 at the end of a discharging second time period t2 and a discharging current value I2;
s3, calculating the charging DCR and/or the discharging DCR of the lithium ion battery, wherein the calculation formula is as follows:
charging DCR ═ (V2-V1)/I1;
discharge DCR ═ (V3-V4)/I2.
Preferably, the lithium ion battery charging and discharging cycle in step S1 includes cyclically executing the following steps:
s11, standing the lithium ion battery for a third time period, and continuously charging the lithium ion battery to a charge cut-off voltage;
and S12, standing the lithium ion battery for a fourth time period, and continuously discharging to a discharge cut-off voltage.
Preferably, the continuous charging in step S11 is constant current continuous charging in the charging first time period t1, and/or the continuous discharging in step S12 is constant current continuous discharging in the discharging second time period t 2.
Preferably, the acquiring data in the charge-discharge cycle of the lithium ion battery in step S1 specifically includes: and acquiring data every other preset time period, wherein the preset time period is not longer than 10 seconds.
Preferably, the monitoring method further comprises: and acquiring the change trend of the discharging DCR and/or the charging DCR according to the calculated discharging DCR and/or charging DCR.
Preferably, the charging first time period t1 is not longer than 60 seconds, and/or the discharging second time period t2 is not longer than 60 seconds.
A system for monitoring DCR during cycling of a lithium ion battery, the system comprising:
the data acquisition module is used for acquiring data in the charge and discharge cycle of the lithium ion battery, wherein the data comprises time, and a voltage value and a charge and discharge current value of the lithium ion battery at corresponding time in the charge and discharge process;
the data extraction module is used for extracting test data of a plurality of charge and discharge cycles from the data acquired by the data acquisition module, and the test data of each charge and discharge cycle comprises a last voltage value V1 before the charging starts, a voltage value V2 at the tail end of a charging first time period t1, a charging current value I1, a last voltage value V3 before the discharging starts, a voltage value V4 at the tail end of a discharging second time period t2 and a discharging current value I2;
the calculation module is used for calculating the charging DCR and/or the discharging DCR of the lithium ion battery, and the calculation formula is as follows:
charging DCR ═ (V2-V1)/I1;
discharge DCR ═ (V3-V4)/I2.
Preferably, the data acquisition module is configured to perform charge and discharge cycles on the lithium ion battery by cyclically invoking a charging unit and a discharging unit, wherein,
the charging unit is used for standing the lithium ion battery for a third time period and continuously charging the lithium ion battery to a charging cut-off voltage;
and the discharge unit is used for standing the lithium ion battery for a fourth time period and continuously discharging to a discharge cut-off voltage.
Preferably, the continuous charging performed by the charging unit is constant current continuous charging in the charging first time period t1, and/or the continuous discharging performed by the discharging unit is constant current continuous discharging in the discharging second time period t 2.
Preferably, the data acquisition module is configured to acquire the data every other preset time period, where the preset time period is not longer than 10 seconds.
Preferably, the monitoring system further includes a trend acquiring module, configured to acquire a trend of the discharging DCR and/or the charging DCR according to the calculated discharging DCR and/or charging DCR.
Preferably, the charging first time period t1 in the data extraction module is not longer than 60 seconds, and/or the discharging second time period t2 in the data extraction module is not longer than 60 seconds.
An electronic device comprises a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the DCR monitoring method in the lithium ion battery cycle when executing the computer program.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the aforementioned steps of the method for monitoring DCR in a lithium-ion battery cycle.
The positive progress effects of the invention are as follows:
in the battery charging and discharging cycle, data in part of the cycle are extracted from data obtained in the battery charging and discharging cycle process to serve as test data, and DCR (data communication record) including charging and/or discharging DCR is obtained through test data calculation, so that the DCR test is not required to be carried out independently outside the battery charging and discharging cycle test, the charging and discharging DCR data of the lithium ion battery in the cycle process can be obtained quickly, the DCR change trend of the lithium ion battery in the cycle process can be continuously monitored, the risk of battery core performance abnormity can be analyzed and identified in advance, and time cost and test cost can be saved to a great extent.
Drawings
Fig. 1 is a flowchart of a method for monitoring DCR during a lithium ion battery cycle process according to embodiment 1 of the present invention.
Fig. 2 is a charge-discharge DCR change trend chart obtained in the method for monitoring DCR during the cycle of the lithium ion battery in embodiment 1 of the present invention.
Fig. 3 is a block diagram of a monitoring system for a DCR during a lithium ion battery cycle process according to embodiment 2 of the present invention.
Fig. 4 is a block diagram of an electronic device according to embodiment 3 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
The present embodiment provides a method for monitoring DCR in a lithium ion battery cycle process, as shown in fig. 1, the method includes the following steps:
s1, acquiring data of the lithium ion battery in the charge-discharge cycle process, wherein the data comprises time, and a voltage value and a charge-discharge current value of the lithium ion battery at corresponding time in the charge-discharge process;
since the data acquired in step S1 is from the charge-discharge cycle process of the lithium ion battery, the charge-discharge cycle of the lithium ion battery may specifically include the following steps: standing the lithium ion battery for a third time period, continuously charging the lithium ion battery at a constant current till a charge cut-off voltage, and standing the lithium ion battery for a fourth time period, and continuously discharging the lithium ion battery at the constant current till the discharge cut-off voltage;
s2, extracting test data of a plurality of charge and discharge cycles from the data acquired in the step S1, wherein the test data of each charge and discharge cycle comprise a last voltage value V1 before the charging starts, a voltage value V2 at the end of a charging first time period t1, a charging current value I1, a last voltage value V3 before the discharging starts, a voltage value V4 at the end of a discharging second time period t2 and a discharging current value I2;
s3, calculating the charging DCR and/or the discharging DCR of the lithium ion battery, wherein the calculation formula is as follows:
charging DCR ═ (V2-V1)/I1;
discharge DCR ═ (V3-V4)/I2.
Preferably, the acquiring data in the charge-discharge cycle of the lithium ion battery in step S1 specifically includes: the data is acquired every other preset time period, generally, the shorter the preset time period is, the more sensitively the acquired data can reflect the change of each voltage value and current value in the charging and discharging process, and preferably, the preset time period is not longer than 10 seconds.
Preferably, the charging first time period t1 is not longer than 60 seconds, and/or the discharging second time period t2 is not longer than 60 seconds, and a person skilled in the art can set specific values according to actual situations.
The embodiment may further include: and acquiring the change trend of the discharging DCR and/or the charging DCR according to the calculated discharging DCR and/or charging DCR.
Taking a square aluminum shell lithium iron phosphate battery of 105Ah as an example, a specific implementation process of the method for monitoring DCR in the cycle process of the lithium ion battery of this embodiment is described in detail below, wherein the test environment temperature may be set to 25 ± 2 ℃, and the charging and discharging currents are all 105A. The standing time is 1 hour, and the monitoring method specifically comprises the following steps:
s101, acquiring data in charge and discharge cycles of the lithium ion battery, wherein the data comprises time, and a voltage value and a charge and discharge current value of the lithium ion battery at corresponding time in the charge and discharge processes, and part of cycle data is shown in the following table;
s102, extracting test data of a plurality of charge and discharge cycles from the data acquired in the step S101, wherein the test data of each charge and discharge cycle comprises a last voltage value V1 before the start of charging, a voltage value V2 at the end of 30 seconds in a first charging period, a charging current value I1, a last voltage value V3 before the start of discharging, a voltage value V4 at the end of 30 seconds in a second discharging period, and a discharging current value I2;
the table above shows the partial data in the charging cycle, where the extracted test data for calculating the charging DCR are: the test time 22:36:30, namely the last voltage value V1 before the charging is started is 2.6612V, the test time 22:37:00, namely the voltage value V2 of 30 seconds of charging is 3.0273V, and the charging current value I1 is 104.99A;
similarly, the discharge DCR can be calculated by extracting the required test data from the data in the discharge cycle.
Preferably, the test data extracted in this step corresponds to the following cycle number: 1-20, 25, 30, 35, … …, 90, 95, 100, 110, 120, … …, 280, 290, 300;
the cycle number refers to the sequential counting of the charge and discharge cycles of the battery, for example, the cycle number corresponding to the first charge and discharge cycle is 1, the cycle number corresponding to the second charge and discharge cycle is 2, and so on.
The extracted data corresponds to the cycle number 1, which means that the data is extracted from the first charge-discharge cycle process, and so on.
S103, calculating the charging DCR and/or the discharging DCR of the lithium ion battery, wherein the calculation formula is as follows:
charging DCR ═ (V2-V1)/I1;
discharge DCR ═ (V3-V4)/I2.
The results of the calculations are shown in the table below. The DCR values in the table below are values obtained from testing a particular lithium ion battery under particular environmental conditions for reference only, and one skilled in the art will appreciate that the values obtained may vary from test environment to test environment and from test subject to test subject.
And obtaining the change trends of the discharging DCR and the charging DCR according to the discharging DCR and the charging DCR obtained through calculation. As shown in fig. 2.
Both discharging DCR and charging DCR are important performance indicators of lithium ion batteries. The charging DCR reflects the charging polarization and the charging heat production capacity of the battery cell, and the discharging DCR reflects the polarization and the heat production capacity of the discharging state of the battery cell. The DCR in the non-cyclic process is the short-term DCR of the battery cell, and polarization accumulation, side reaction accumulation and the like are less due to short time. By the method of the embodiment, the charging and discharging DCR in the cycle process of the lithium ion battery is tested, and the long-term DCR of the battery cell can be reflected, so that the comprehensive conditions of ohmic internal resistance, polarization accumulation, side reaction accumulation, pole piece health state and the like of the battery cell can be known, and then whether the cycle performance is deteriorated or not can be judged according to whether the DCR has sudden change or not.
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 example of the 105Ah square aluminum shell lithium iron phosphate battery are merely examples, and should not bring any limitation to the execution of the steps in the embodiment of the present invention, and a person skilled in the art may adopt different values as needed as long as the method of the present invention can be normally implemented.
Example 2
This embodiment provides a monitoring system for a DCR in a lithium ion battery cycle process, as shown in fig. 3, the DCR testing system 1 includes:
the data acquisition module 11 is configured to acquire data in a charge-discharge cycle of the lithium ion battery, where the data includes time and a voltage value and a charge-discharge current value of the lithium ion battery at corresponding time in a charge-discharge process;
the data obtaining module 11 is configured to perform charge and discharge cycles on the lithium ion battery by cyclically calling a charging unit 111 and a discharging unit 112, where the continuous charging performed by the charging unit 111 is constant current continuous charging in the charging first time period t1, and/or the continuous discharging performed by the discharging unit 112 is constant current continuous discharging in the discharging second time period t 2.
The data obtaining module 11 is configured to obtain data every other preset time period, generally, the shorter the preset time period is, the more sensitively the obtained data can reflect changes of voltage values and current values in the charging and discharging processes, and preferably, the preset time period is not longer than 10 seconds.
A data extraction module 12, configured to extract test data of a plurality of charge and discharge cycles from the data acquired by the data acquisition module 11, where the test data of each charge and discharge cycle includes a last voltage value V1 before the start of charging, a voltage value V2 at the end of a first charging time period t1, a charging current value I1, a last voltage value V3 before the start of discharging, a voltage value V4 at the end of a second discharging time period t2, and a discharging current value I2;
preferably, the charging first time period t1 is not longer than 60 seconds, and/or the discharging second time period t2 in the data extraction module is not longer than 60 seconds, and a person skilled in the art can set specific values according to actual situations.
A calculating module 13, configured to calculate a charging DCR and/or a discharging DCR of the lithium ion battery, where the calculation formula is as follows:
charging DCR ═ (V2-V1)/I1;
discharge DCR ═ (V3-V4)/I2;
and the variation trend acquisition module 14 is configured to acquire a variation trend of the discharging DCR and/or the charging DCR according to the calculated discharging DCR and/or charging DCR.
Taking a square aluminum shell lithium iron phosphate battery of 105Ah as an example, a specific implementation process of the DCR monitoring system in the lithium ion battery cycle process of this embodiment is described in detail below, where the test environment temperature may be set to 25 ± 2 ℃, the charge and discharge currents are 105A, and the standing time is 1 hour, and the monitoring system specifically includes:
the data acquisition module 11 is configured to call a charging unit 111 and a discharging unit 112 to perform charge and discharge cycles on the lithium ion battery through cycling, where the charging unit 111 is configured to stand the lithium ion battery for a third time period of 1 hour, and continuously charge the lithium ion battery to a charge cut-off voltage with a current value 105A, and the discharging unit 112 is configured to stand the lithium ion battery for 1 hour, and continuously discharge the lithium ion battery to a discharge cut-off voltage with a current value 105A; the data acquisition unit is used for acquiring data in the charge and discharge cycle of the lithium ion battery, wherein the data comprises time, and voltage values and charge and discharge current values of the lithium ion battery at corresponding time in the charge and discharge process, and the cycle data of the time interval of 10 seconds is shown in the following table;
the data extraction module 12 is configured to extract test data of a plurality of charge and discharge cycles from the data acquired by the data acquisition module, where the test data of each charge and discharge cycle includes a last voltage value V1 before the start of charging, a voltage value V2 at the end of 30 seconds of the first charging period, a charging current value 105A, a last voltage value V3 before the start of discharging, a voltage value V4 at the end of 30 seconds of the second discharging period, and a discharging current value I2;
the table above shows the partial data in the charging cycle, where the extracted test data for calculating the charging DCR are: the test time 22:36:30, namely the last voltage value V1 before the charging is started is 2.6612V, the test time 22:37:00, namely the voltage value V2 of 30 seconds of charging is 3.0273V, and the charging current value I1 is 104.99A;
similarly, the discharge DCR can be calculated by extracting the required test data from the data in the discharge cycle.
Preferably, the test data extracted in this step corresponds to the following cycle number: 1-20, 25, 30, 35, … …, 90, 95, 100, 110, 120, … …, 280, 290, 300;
the cycle number refers to the sequential counting of the charge and discharge cycles of the battery, for example, the cycle number corresponding to the first charge and discharge cycle is 1, the cycle number corresponding to the second charge and discharge cycle is 2, and so on.
The extracted data corresponds to the cycle number 1, which means that the data is extracted from the first charge-discharge cycle process, and so on.
A calculating module 13, configured to calculate a charging DCR and/or a discharging DCR of the lithium ion battery, where the calculation formula is as follows:
charging DCR ═ (V2-V1)/I1;
discharge DCR ═ (V3-V4)/I2;
the results of the calculations are shown in the table below. The DCR values in the table below are values obtained from testing a particular lithium ion battery under particular environmental conditions for reference only, and one skilled in the art will appreciate that the values obtained may vary from test environment to test environment and from test subject to test subject.
And the variation trend acquisition module 14 is configured to acquire a variation trend of the discharging DCR and/or the charging DCR according to the calculated discharging DCR and/or charging DCR. As shown in fig. 2.
Both discharging DCR and charging DCR are important performance indicators of lithium ion batteries. The charging DCR reflects the charging polarization and the charging heat production capacity of the battery cell, and the discharging DCR reflects the polarization and the heat production capacity of the discharging state of the battery cell. The DCR in the non-cyclic process is the short-term DCR of the battery cell, and polarization accumulation, side reaction accumulation and the like are less due to short time. By the method of the embodiment, the charging and discharging DCR in the cycle process of the lithium ion battery is tested, and the long-term DCR of the battery cell can be reflected, so that the comprehensive conditions of ohmic internal resistance, polarization accumulation, side reaction accumulation, pole piece health state and the like of the battery cell can be known, and then whether the cycle performance is deteriorated or not can be judged according to whether the DCR has sudden change or not.
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 example of the 105Ah square aluminum shell lithium iron phosphate battery are merely examples, and should not bring any limitation to the execution of the steps in the embodiment of the present invention, and a person skilled in the art may adopt different values as needed as long as the method of the present invention can be normally implemented.
Example 3
The present invention further provides an electronic device, as shown in fig. 4, the electronic device may include a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to implement the steps of the method for monitoring DCR during the cycling process of the lithium ion battery in embodiment 1.
It should be understood that the electronic device shown in fig. 4 is only an example, and should not bring any limitation to the functions and the scope of the application of the embodiments of the present invention.
As shown in fig. 4, the electronic device 2 may be embodied in the form of a general purpose computing device, such as: which may be a server device. The components of the electronic device 2 may include, but are not limited to: the at least one processor 3, the at least one memory 4, and a bus 5 connecting the various system components (including the memory 4 and the processor 3).
The bus 5 may include a data bus, an address bus, and a control bus.
The memory 4 may include volatile memory, such as Random Access Memory (RAM)41 and/or cache memory 42, and may further include Read Only Memory (ROM) 43.
The memory 4 may also include a program tool 45 (or utility tool) having a set (at least one) of program modules 44, such program modules 44 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.
The processor 3 executes various functional applications and data processing, such as the steps of the monitoring method for DCR during cycling of the lithium ion battery in the foregoing embodiment 1, by running the computer program stored in the memory 4.
The electronic device 2 may also communicate with one or more external devices 6, such as a keyboard, pointing device, etc. Such communication may be via an input/output (I/O) interface 7. Also, the model-generated electronic device 2 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network) via the network adapter 8.
As shown in FIG. 4, the network adapter 8 may communicate with other modules of the model-generated electronic device 2 via a bus 5. It will be appreciated by those skilled in the art that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the model-generated electronic device 2, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems, etc.
It should be noted that although in the above detailed description several units/modules or sub-units/modules of the electronic device are mentioned, such division is merely exemplary and not mandatory. Indeed, the features and functionality of two or more of the units/modules described above may be embodied in one unit/module according to embodiments of the invention. Conversely, the features and functions of one unit/module described above may be further divided into embodiments by a plurality of units/modules.
Example 4
The present embodiment provides a computer-readable storage medium, on which a computer program is stored, and the program, when executed by a processor, implements the steps of the monitoring method for DCR during cycling of a lithium ion battery in the foregoing embodiment 1.
More specific ways in which the computer-readable storage medium may be employed may include, but are not limited to: a portable disk, a hard disk, random access memory, read only memory, erasable programmable read only memory, optical storage device, magnetic storage device, or any suitable combination of the foregoing.
In a possible implementation manner, the present invention can also be implemented in the form of a program product, which includes program codes, when the program product runs on a terminal device, the program codes are used for causing the terminal device to execute the steps of implementing the method for monitoring DCR during cycling of a lithium ion battery in the foregoing embodiment 1.
Where program code for carrying out the invention is written in any combination of one or more programming languages, the program code may execute entirely on the user device, partly on the user device, as a stand-alone software package, partly on the user device and partly on a remote device or entirely on the remote device.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (14)
1. A method for monitoring DCR in a lithium ion battery cycle process is characterized by comprising the following steps:
s1, acquiring data of the lithium ion battery in the charge-discharge cycle process, wherein the data comprises time, and a voltage value and a charge-discharge current value of the lithium ion battery at corresponding time in the charge-discharge process;
s2, extracting test data of a plurality of charge and discharge cycles from the data acquired in the step S1, wherein the test data of each charge and discharge cycle comprise a last voltage value V1 before the charging starts, a voltage value V2 at the end of a charging first time period t1, a charging current value I1, a last voltage value V3 before the discharging starts, a voltage value V4 at the end of a discharging second time period t2 and a discharging current value I2;
s3, calculating the charging DCR and/or the discharging DCR of the lithium ion battery, wherein the calculation formula is as follows:
charging DCR ═ (V2-V1)/I1;
discharge DCR ═ (V3-V4)/I2.
2. The method for monitoring DCR during lithium ion battery cycling according to claim 1, wherein the lithium ion battery charging and discharging cycling in step S1 includes cyclically executing the following steps:
s11, standing the lithium ion battery for a third time period, and continuously charging the lithium ion battery to a charge cut-off voltage;
and S12, standing the lithium ion battery for a fourth time period, and continuously discharging to a discharge cut-off voltage.
3. The method for monitoring DCR during lithium ion battery cycling according to claim 2, wherein said continuous charging in step S11 is constant current continuous charging during said charging first time period t1, and/or said continuous discharging in step S12 is constant current continuous discharging during said discharging second time period t 2.
4. The method for monitoring DCR during lithium ion battery cycling according to claim 1, wherein the acquiring data during lithium ion battery charging and discharging cycling in step S1 specifically includes: and acquiring data every other preset time period, wherein the preset time period is not longer than 10 seconds.
5. The method for monitoring DCR during cycling of a lithium ion battery according to claim 1, further comprising: and acquiring the change trend of the discharging DCR and/or the charging DCR according to the calculated discharging DCR and/or charging DCR.
6. The method for monitoring DCR during cycling of a lithium-ion battery according to claim 1, wherein said first period of time of charging t1 is not longer than 60 seconds, and/or said second period of time of discharging t2 is not longer than 60 seconds.
7. A monitoring system for DCR in a lithium ion battery cycle process, the monitoring system comprising:
the data acquisition module is used for acquiring data in the charge and discharge cycle of the lithium ion battery, wherein the data comprises time, and a voltage value and a charge and discharge current value of the lithium ion battery at corresponding time in the charge and discharge process;
the data extraction module is used for extracting test data of a plurality of charge and discharge cycles from the data acquired by the data acquisition module, and the test data of each charge and discharge cycle comprises a last voltage value V1 before the charging starts, a voltage value V2 at the tail end of a charging first time period t1, a charging current value I1, a last voltage value V3 before the discharging starts, a voltage value V4 at the tail end of a discharging second time period t2 and a discharging current value I2;
the calculation module is used for calculating the charging DCR and/or the discharging DCR of the lithium ion battery, and the calculation formula is as follows:
charging DCR ═ (V2-V1)/I1;
discharge DCR ═ (V3-V4)/I2.
8. The system for monitoring DCR during lithium ion battery cycling of claim 7, wherein said data acquisition module is configured to cycle said lithium ion battery for charging and discharging by cycling a charging unit and a discharging unit, wherein,
the charging unit is used for standing the lithium ion battery for a third time period and continuously charging the lithium ion battery to a charging cut-off voltage;
and the discharge unit is used for standing the lithium ion battery for a fourth time period and continuously discharging to a discharge cut-off voltage.
9. The system for monitoring the DCR during the cycling of the lithium-ion battery according to claim 8, wherein the continuous charging performed by the charging unit is constant-current continuous charging during the charging first time period t1, and/or the continuous discharging performed by the discharging unit is constant-current continuous discharging during the discharging second time period t 2.
10. The system for monitoring DCR during lithium ion battery cycling according to claim 7, wherein the data acquiring module is configured to acquire the data every other preset time period, and the preset time period is not longer than 10 seconds.
11. The system for monitoring the DCR during the cycling of the lithium ion battery according to claim 7, wherein the monitoring system further comprises a trend acquiring module for acquiring a trend of the discharging DCR and/or the charging DCR according to the calculated discharging DCR and/or charging DCR.
12. The system for monitoring DCR during lithium ion battery cycling according to claim 7, wherein said first charging time period t1 in the data extraction module is not longer than 60 seconds, and/or said second discharging time period t2 in the data extraction module is not longer than 60 seconds.
13. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method according to any of claims 1-6 are implemented when the computer program is executed by the processor.
14. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
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