CN114325436B - Calibration method of DCIR test value - Google Patents
Calibration method of DCIR test value Download PDFInfo
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- CN114325436B CN114325436B CN202111602037.8A CN202111602037A CN114325436B CN 114325436 B CN114325436 B CN 114325436B CN 202111602037 A CN202111602037 A CN 202111602037A CN 114325436 B CN114325436 B CN 114325436B
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- 238000012360 testing method Methods 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 21
- 102100028667 C-type lectin domain family 4 member A Human genes 0.000 title claims abstract 30
- 101000766908 Homo sapiens C-type lectin domain family 4 member A Proteins 0.000 title claims abstract 30
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 68
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 65
- 238000012937 correction Methods 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
- 238000009529 body temperature measurement Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
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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 application discloses a calibration method of a DCIR test value, which comprises the following steps: acquiring a DCIR test value of a lithium ion battery cell to be measured; acquiring a temperature value of a lithium ion battery cell, and setting a temperature reference value; and acquiring a calibrated DCIR test value according to the DCIR test value, the temperature value of the battery cell and the temperature reference value. The application provides a calibration method of a DCIR test value, which combines the relation between the DCIR test value and an environment temperature value and the temperature value T1 of a lithium ion battery cell to calibrate the DCIR test value, thereby avoiding the drift generated by the placement of the lithium ion battery cell and the environment temperature value and obtaining the calibrated DCIR test value. The application can obtain accurate DCIR test value, reduce the requirement on test environment and make the test more convenient.
Description
Technical Field
The application belongs to the field of DCIR (direct current infrared) test of lithium ion batteries, and particularly relates to a calibration method of a DCIR test value.
Background
In the production process of lithium ion battery cells, DCIR (Direct Current Internal Resistance ) values of each lithium ion battery cell must be detected. The DCIR value characterizes the internal resistance of the lithium ion battery cell, and is an important screening index for grading and grouping the lithium ion battery cells, so that the DCIR value needs to be accurately measured.
The DCIR value comprises ohmic internal resistance and electrochemical internal resistance, and the electrochemical internal resistance is greatly influenced by the temperature of the lithium ion battery cell (the higher the temperature is, the smaller the electrochemical internal resistance is), so that in the production process of the lithium ion battery cell, the measured DCIR value can be greatly fluctuated due to the fact that the lithium battery cell is placed and the temperature fluctuation of a test environment is large, the measured DCIR value is not a real DCIR value, judgment of the real quality of the lithium ion battery cell by workers is affected, and the product yield is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the calibration method of the DCIR test value solves the problems in the prior art.
In order to achieve the aim of the application, the application adopts the following technical scheme: a method of calibrating DCIR test values, comprising:
acquiring a DCIR test value of a lithium ion battery cell to be measured;
acquiring a temperature value of a lithium ion battery cell, and setting a temperature reference value;
and acquiring a calibrated DCIR test value according to the DCIR test value, the temperature value of the battery cell and the temperature reference value.
Further, the obtaining the DCIR test value of the lithium ion battery cell to be measured includes:
acquiring a first voltage value V1 of a lithium ion battery cell to be measured;
discharging the lithium ion battery cell to be measured in a constant current manner, wherein the current of the constant current discharge is I1;
acquiring a second voltage value V2 of the lithium ion battery cell to be measured in constant-current discharge;
and acquiring a DCIR test value of the lithium ion battery cell to be measured according to the first voltage value V1, the current I1 and the second voltage value V2.
Further, the DCIR test value of the lithium ion battery cell to be measured is:
further, the value range of the current I1 is 1.5C to 3C.
Further, the obtaining the temperature value of the lithium ion battery cell includes:
and when the second voltage value V2 of the lithium ion battery cell to be measured in constant-current discharge is obtained, the temperature value T1 of the lithium ion battery cell to be measured is obtained through an infrared temperature measuring device.
Further, the obtaining the calibrated DCIR test value according to the DCIR test value, the temperature value of the battery cell and the temperature reference value includes:
acquiring a DCIR correction value according to the temperature value T1 and the temperature reference value;
and acquiring a calibrated DCIR test value according to the DCIR test value and the DCIR correction value.
Further, the DCIR correction value is:
ΔDCIR＝-0.0174*(T1-T2)
where Δdcir represents the DCIR correction value and T2 represents the temperature reference value.
Further, the calibrated DCIR test values are:
DCIR'＝DCIR-ΔDCIR＝DCIR+0.0174*(T1-T2)
where DCIR' represents the calibrated DCIR test value.
The beneficial effects of the application are as follows:
(1) The application provides a calibration method of a DCIR test value, which combines the relation between the DCIR test value and a set temperature reference value T2 and the temperature value T1 of a lithium ion battery cell to calibrate the DCIR test value, thereby avoiding drift caused by placement of the lithium ion battery cell and the temperature value of a test environment and obtaining the calibrated DCIR test value.
(2) The application can obtain accurate DCIR test value, reduce the requirement on test environment and make the test more convenient.
Drawings
Fig. 1 is a flowchart of a calibration method for DCIR test values according to an embodiment of the present application.
Fig. 2 is a block diagram of a calibration device for DCIR test values according to an embodiment of the present application.
Fig. 3 is a block diagram of a calibration device for DCIR test values according to an embodiment of the present application.
Wherein the 21-DCIR measurement module, the 22-temperature measurement module, the 23-calibration module, the 30-calibration device, the 31-memory, the 32-processor, and the 33-bus.
Detailed Description
The following description of the embodiments of the present application is provided to facilitate understanding of the present application by those skilled in the art, but it should be understood that the present application is not limited to the scope of the embodiments, and all the applications which make use of the inventive concept are protected by the spirit and scope of the present application as defined and defined in the appended claims to those skilled in the art.
Embodiments of the present application are described in detail below with reference to the accompanying drawings.
Example 1
As shown in fig. 1, a calibration method for DCIR test values includes:
s1, acquiring a DCIR test value of the lithium ion battery cell to be measured.
The lithium ion battery cell to be measured represents the lithium ion battery cell needing to measure DCIR, the DCIR test value is obtained first, and then the DCIR test value is calibrated, so that the lithium ion battery cell to be measured is correctly classified.
S2, acquiring a temperature value of the lithium ion battery core, and setting a temperature reference value.
The temperature value of the measurement cell can be measured by an infrared temperature sensing device, an infrared temperature sensor or other temperature sensors, preferably an infrared temperature sensing device, so that the temperature value of the cell is accurately measured, and a larger measurement range is provided.
And S3, acquiring a calibrated DCIR test value according to the DCIR test value, the temperature value of the battery cell and the temperature reference value.
The application provides a calibration method of a DCIR test value, which combines the relation between the DCIR test value and a set temperature reference value T2 and the temperature value T1 of a lithium ion battery cell to calibrate the DCIR test value, thereby avoiding drift caused by placement of the lithium ion battery cell and the temperature value of a test environment and obtaining the calibrated DCIR test value.
In one possible embodiment, the obtaining the DCIR test value of the lithium ion battery cell to be measured includes:
acquiring a first voltage value V1 of a lithium ion battery cell to be measured;
discharging the lithium ion battery cell to be measured in a constant current manner, wherein the current of the constant current discharge is I1;
acquiring a second voltage value V2 of the lithium ion battery cell to be measured in constant-current discharge;
and acquiring a DCIR test value of the lithium ion battery cell to be measured according to the first voltage value V1, the current I1 and the second voltage value V2.
In one possible embodiment, the DCIR test value of the lithium ion cell to be measured is:
in one possible embodiment, the current I1 has a value in the range of 1.5C to 3C.
By the method for acquiring the DCIR test value of the lithium ion battery cell to be measured, which is influenced by the ambient temperature, can be acquired, and then the DCIR test value is calibrated, so that the real DCIR test value is acquired.
In one possible embodiment, the obtaining the temperature value of the lithium ion battery cell includes:
and when the second voltage value V2 of the lithium ion battery cell to be measured in constant-current discharge is obtained, the temperature value T1 of the lithium ion battery cell to be measured is obtained through an infrared temperature measuring device.
Optionally, a plurality of infrared temperature measuring devices can be arranged above a tray for placing the lithium ion battery cell, and when the DCIR test value is obtained, the temperature value T1 of the lithium ion battery cell is measured at the same time, so that temperature compensation is performed on the DCIR test value. The temperature measurement is carried out through a plurality of infrared temperature measuring devices, so that the temperature value T1 of the lithium ion battery cell can be ensured to be measured. If the temperature values of the lithium ion battery cells are measured by the plurality of infrared temperature measuring devices, the average value of the temperature values is used as the temperature value T1 of the lithium ion battery cells, so that the accuracy of data is ensured.
It is worth to say that the measuring range of a plurality of infrared temperature measuring devices can cover the whole tray, so that the temperature of the lithium ion battery cell can be measured.
In one possible implementation manner, the obtaining the calibrated DCIR test value according to the DCIR test value, the temperature value of the battery cell and the temperature reference value includes:
acquiring a DCIR correction value according to the temperature value T1 and the temperature reference value;
and acquiring a calibrated DCIR test value according to the DCIR test value and the DCIR correction value.
Through the calibration of the temperature value, the drift of the DCIR test value brought by the ambient temperature is eliminated, and the accuracy of the DCIR test value finally obtained is ensured, so that the requirement of acquiring the DCIR test value on the ambient temperature is reduced, the energy consumption of a measuring workshop is reduced, and the yield of production is improved.
In one possible embodiment, the DCIR correction value is:
ΔDCIR＝-0.0174*(T1-T2)
where Δdcir represents the DCIR correction value and T2 represents the temperature reference value.
In one possible embodiment, the calibrated DCIR test values are:
DCIR'＝DCIR-ΔDCIR＝DCIR+0.0174*(T1-T2)
where DCIR' represents the calibrated DCIR test value.
The application can obtain accurate DCIR test value, reduce the requirement on test environment and make the test more convenient.
Example 2
As shown in fig. 2, the present embodiment provides a calibration device for DCIR test values, which includes: DCIR measurement module 21, temperature measurement module 22, and calibration module 23.
The DCIR measurement module 21 is configured to obtain a DCIR test value of the lithium ion battery cell to be measured.
The temperature measurement module 22 is used for obtaining the temperature value of the lithium ion battery cell and setting a temperature reference value.
The calibration module 23 is configured to obtain a calibrated DCIR test value according to the DCIR test value, the temperature value of the battery cell, and the temperature reference value.
In one possible embodiment, the DCIR measurement module 21 is specifically configured to obtain a first voltage value V1 of the lithium ion battery cell to be measured; discharging the lithium ion battery cell to be measured in a constant current manner, wherein the current of the constant current discharge is I1; acquiring a second voltage value V2 of the lithium ion battery cell to be measured in constant-current discharge; and acquiring a DCIR test value of the lithium ion battery cell to be measured according to the first voltage value V1, the current I1 and the second voltage value V2.
Optionally, the DCIR test value of the lithium ion battery cell to be measured is:
optionally, the value range of the current I1 is 1.5C to 3C.
In one possible implementation, the temperature measurement module 22 is specifically configured to obtain, through the infrared temperature measurement device, the temperature value T1 of the lithium ion battery cell to be measured when obtaining the second voltage value V2 of the lithium ion battery cell to be measured during constant current discharge.
In one possible embodiment, the calibration module 23 is specifically configured to obtain the DCIR correction value according to the temperature value T1 and the temperature reference value; and acquiring a calibrated DCIR test value according to the DCIR test value and the DCIR correction value.
Optionally, the DCIR correction value is:
ΔDCIR＝-0.0174*(T1-T2)
where Δdcir represents the DCIR correction value and T2 represents the temperature reference value.
Optionally, the calibrated DCIR test value is:
DCIR'＝DCIR-ΔDCIR＝DCIR+0.0174*(T1-T2)
where DCIR' represents the calibrated DCIR test value.
The beneficial effects of the calibration device for DCIR test values provided in this embodiment are similar to those of the technical solution described in embodiment 1, and are not repeated here.
Example 3
As shown in fig. 3, a calibration device for DCIR test values is provided, the calibration device 30 may comprise a memory 31 and a processor 32. The memory 31 and the processor 32 are illustratively interconnected by a bus 33.
The memory 31 stores computer-executable instructions;
processor 32 executes the computer-executable instructions stored in memory to cause the processor to perform the method of calibrating the DCIR test values described above.
The calibration device for DCIR test values in the embodiment of fig. 3 may implement the technical solution described in embodiment 1, and its implementation principle and beneficial effects are similar, and will not be described in detail here.
Example 4
The present embodiment provides a computer-readable storage medium having stored therein computer-executable instructions for implementing the calibration method of DCIR test values described in embodiment 1 above when the computer-executable instructions are executed by a processor.
Example 5
Embodiments of the present application may also provide a computer program product comprising a computer program which, when executed by a processor, implements the method for calibrating DCIR test values described in embodiment 1 above.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processing unit of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processing unit of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (4)
1. A method of calibrating DCIR test values, comprising:
acquiring a DCIR test value of a lithium ion battery cell to be measured;
acquiring a temperature value of a lithium ion battery cell, and setting a temperature reference value;
acquiring a calibrated DCIR test value according to the DCIR test value, the temperature value of the battery cell and the temperature reference value;
the obtaining the temperature value of the lithium ion battery cell comprises the following steps:
when a second voltage value V2 of the lithium ion battery cell to be measured in constant-current discharge is obtained, obtaining a temperature value T1 of the lithium ion battery cell to be measured through an infrared temperature measuring device;
the step of obtaining the calibrated DCIR test value according to the DCIR test value, the temperature value of the battery cell and the temperature reference value comprises the following steps:
acquiring a DCIR correction value according to the temperature value T1 and the temperature reference value;
acquiring a calibrated DCIR test value according to the DCIR test value and the DCIR correction value;
the DCIR correction value is:
wherein ,a DCIR correction value, T2 a temperature reference value;
the calibrated DCIR test values are:
wherein ,indicating the DCIR test values after calibration.
2. The method for calibrating a DCIR test value according to claim 1, wherein the obtaining the DCIR test value of the lithium ion cell to be measured comprises:
acquiring a first voltage value V1 of a lithium ion battery cell to be measured;
discharging the lithium ion battery cell to be measured in a constant current manner, wherein the current of the constant current discharge is I1;
acquiring a second voltage value V2 of the lithium ion battery cell to be measured in constant-current discharge;
and acquiring a DCIR test value of the lithium ion battery cell to be measured according to the first voltage value V1, the current I1 and the second voltage value V2.
3. The method for calibrating a DCIR test value according to claim 2, wherein the DCIR test value of the lithium ion cell to be measured is:
。
4. a method of calibrating a DCIR test value according to claim 2 or 3, characterized in that the current I1 has a value in the range 1.5C to 3C.
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