CN110133509A - A kind of emulation mode of lithium ion battery DCR test - Google Patents
A kind of emulation mode of lithium ion battery DCR test Download PDFInfo
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- CN110133509A CN110133509A CN201910350515.7A CN201910350515A CN110133509A CN 110133509 A CN110133509 A CN 110133509A CN 201910350515 A CN201910350515 A CN 201910350515A CN 110133509 A CN110133509 A CN 110133509A
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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]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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Abstract
The invention discloses a kind of emulation mode of lithium ion battery DCR test, the voltage-vs-time experimental data and acquisition three-dimensional electrochemical-thermal coupling model room temperature multiplying power discharging voltage-vs-time for obtaining tested battery room temperature multiplying power discharging emulate data；The voltage-vs-time experimental data and three-dimensional electrochemical-thermal coupling model voltage-vs-time emulation data for comparing tested battery are modified three-dimensional electrochemical after being corrected-thermal coupling model to three-dimensional electrochemical-thermal coupling model；Room temperature is carried out no more than 0.02C electric discharge emulation to three-dimensional electrochemical after amendment-thermal coupling model, obtains SOC-OCV data；DCR emulation is carried out to three-dimensional electrochemical after amendment-thermal coupling model, to obtain DCR emulation data；DCR is tested by emulation experiment, not only shortens the testing time, but also saves experimental cost.
Description
Technical field
The present invention, which relates to, belongs to technical field of lithium batteries, and in particular to a kind of emulation mode of lithium ion battery DCR test.
Background technique
With the continuous development of science and technology and the continuous exacerbation of environment and energy crisis, the application of new-energy automobile are also more next
It is more extensive.Power battery is common power resources in new-energy automobile, is one of most important component, power battery in automobile
The quality of performance directly affects the cruising ability and safety of automobile.
The DCR of lithium ion battery is an important indicator for measuring battery performance, and the hair of battery can also be calculated by DCR
Thermal power.DCR test at present is all the experiment DCR test using experimental method, adjust every time need to shelve after SOC 1 hour with
On, the testing time is longer.
Summary of the invention
The purpose of the present invention is to the deficiencies of above-mentioned technology, and providing one kind not only can be shortened the testing time but also can save real
Test the emulation mode of the lithium ion battery DCR test of cost.
To achieve the above object, the emulation mode of the lithium ion battery DCR test designed by the present invention, including walk as follows
It is rapid:
S1 the voltage-vs-time experimental data of tested battery room temperature multiplying power discharging) is obtained；
S2 three-dimensional electrochemical-thermal coupling model of tested battery) is established according to the parameter for being tested battery, and carries out room temperature times
The voltage-vs-time that rate electric discharge emulation obtains room temperature multiplying power discharging emulates data；
S3) comparison step S1) in be tested battery voltage-vs-time experimental data and step S2) in three-dimensional electrochemical-thermal coupling
The voltage-vs-time emulation data of molding type are modified three-dimensional electrochemical-thermal coupling model to obtain revised three-dimensional electrification
- thermal coupling model；
S4 room temperature) is carried out to revised three-dimensional electrochemical-thermal coupling model and is emulated no more than 0.02C electric discharge, to imitative
The voltage-time data of true result is handled to obtain SOC-OCV data；
S5 DCR emulation) is carried out to revised three-dimensional electrochemical-thermal coupling model, to the voltage-vs-time number of simulation result
According to being handled to obtain DCR emulation data.
Further, current value=2 × tested battery 1C volume of 1C electric discharge load is emulated when the room temperature multiplying power discharging
The number of plies of positive plate in constant current value/tested battery.
Further, the step S4) in, no more than 0.02C electric discharge emulation voltage-time data treatment process are as follows: SOC
=1-t/ttot, ttotFor total discharge time, the voltage of t moment thus SOC state when OCV, obtain SOC-OCV data, i.e.,
The OCV of 10%SOC, 20%SOC, 30%SOC, 40%SOC, 50%SOC, 60%SOC, 70%SOC, 80%SOC, 90%SOC
Value is respectively E1, E2, E3, E4, E5, E6, E7, E8, E9.
Further, the step S5) in, DCR emulation is based on revised three-dimensional electrochemical-thermal coupling model, utilizes
Step S4) in the SOC-OCV data that obtain, setting parametrization scanning, sweep parameter is the initial voltage of battery, and initial voltage is
The open-circuit voltage of battery carries out pulsed discharge emulation, and current value is the current value of DCR experiment, calculates the arteries and veins that the time is DCR experiment
Rush the time；
The processing of DCR simulation result voltage-time data: the voltage for finish time of discharging under each SOC state is filtered out, i.e.,
10%, the voltage of finish time of 20%, 30%, 40%, 50%, 60%, 70%, 80%, discharging under 90%SOC state is remembered respectively
For U1, U2, U3, U4, U5, U6, U7, U8, U9；
According to DCR=| △ U | the calculation formula of/I, wherein △ U thus SOC state pulse electric discharge finish time voltage
With the difference of OCV under this SOC state, I is the electric current of DCR test, and it is right under SOC state in one group of SOC-OCV data of scanning to calculate
The DCR for the pulsed discharge answered, the i.e. DCR=of 10%SOC | U1-E1 |/I, according to DCR=| and U1-E1 |/I calculation method is counted respectively
Calculate 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, the DCR under 90%SOC state.
Compared with prior art, the invention has the following advantages that the emulation mode of lithium ion battery DCR test of the present invention,
DCR is tested by emulation experiment, not only shortens the testing time, but also saves experimental cost.
Detailed description of the invention
Fig. 1 is embodiment 1C 18s pulsed discharge DCR simulation result and experimental result comparison diagram.
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
A kind of emulation mode of lithium ion battery DCR test, includes the following steps:
S1 the voltage-vs-time experimental data of tested battery room temperature multiplying power discharging) is obtained；
S2 three-dimensional electrochemical-thermal coupling model of tested battery) is established according to the parameter for being tested battery, and carries out room temperature times
The voltage-vs-time that rate electric discharge emulation obtains room temperature multiplying power discharging emulates data；Wherein, parameter includes design parameter, electrode power
Parameter, thermal physical property parameter etc. are learned, design parameter includes the length etc. of tested battery；
S3) comparison step S1) in be tested battery voltage-vs-time experimental data and step S2) in three-dimensional electrochemical-thermal coupling
The voltage-vs-time emulation data of molding type are modified three-dimensional electrochemical-thermal coupling model to obtain revised three-dimensional electrification
- thermal coupling model；
S4) revised three-dimensional electrochemical-thermal coupling model is carried out and is emulated no more than 0.02C electric discharge, emulation is tied
The voltage-time data of fruit is handled to obtain SOC-OCV data.
Wherein, anode in current value=2 of emulation 1C electric discharge load × tested battery 1C load current value/tested battery
The number of plies of piece.
It discharges no more than 0.02C and emulates voltage-time data treatment process are as follows: SOC=1-t/ttot, ttotWhen always to discharge
Between, the voltage of t moment thus SOC state when OCV, obtain SOC-OCV data, i.e. 10%SOC, 20%SOC, 30%SOC,
The OCV value of 40%SOC, 50%SOC, 60%SOC, 70%SOC, 80%SOC, 90%SOC be respectively E1, E2, E3, E4, E5,
E6,E7,E8,E9；
S5 DCR emulation) is carried out to revised three-dimensional electrochemical-thermal coupling model, to the voltage-vs-time number of simulation result
According to being handled to obtain DCR emulation data；
DCR emulation is based on revised three-dimensional electrochemical-thermal coupling model, utilizes the SOC-OCV number obtained in step S4)
According to setting parametrization scanning, sweep parameter is the initial voltage of battery, and initial voltage is the open-circuit voltage of battery, carries out pulse
Electric discharge emulation, current value are the current value of DCR experiment, calculate the burst length that the time is DCR experiment；
The processing of DCR simulation result voltage-time data: the voltage for finish time of discharging under each SOC state is filtered out, i.e.,
10%, the voltage of finish time of 20%, 30%, 40%, 50%, 60%, 70%, 80%, discharging under 90%SOC state is remembered respectively
For U1, U2, U3, U4, U5, U6, U7, U8, U9；
According to DCR=| △ U | the calculation formula of/I, wherein △ U thus SOC state pulse electric discharge finish time voltage
With the difference of OCV under this SOC state, I is the electric current of DCR test, and it is right under SOC state in one group of SOC-OCV data of scanning to calculate
The DCR for the pulsed discharge answered, the i.e. DCR=of 10%SOC | U1-E1 |/I, according to DCR=| and U1-E1 |/I calculation method is counted respectively
Calculate 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, the DCR under 90%SOC state.
Below with 25 degree of 1C 18s of the ternary lithium ion battery of certain 22Ah electric discharge DCR (10%, 20%, 30%,
40%, 50%, 60%, 70%, 80%, 90%SOC) for, it is illustrated.
Be illustrated to the current value loaded in simulation model: this battery is 22Ah, i.e. 1C is 22A；In one battery just
22 layers of pole piece；The loaded current value of simulation model 1C electric discharge is 22A/22/2=0.5A, then the loaded current value of 2C electric discharge
Loaded current value is discharged for 2 × 0.5A, 0.02C for 0.02 × 0.5A.
S1 the voltage-vs-time experimental data of tested battery room temperature multiplying power discharging) is obtained；
S2 three-dimensional electrochemical-thermal coupling model of tested battery) is established according to the parameter for being tested battery, and carries out room temperature times
Rate electric discharge emulation obtains three-dimensional electrochemical-thermal coupling model room temperature multiplying power discharging voltage-vs-time and emulates data；
S3) comparison step S1) in be tested battery voltage-vs-time experimental data and step S2) in three-dimensional electrochemical-thermal coupling
The voltage-vs-time emulation data of molding type are modified three-dimensional electrochemical-after being corrected to three-dimensional electrochemical-thermal coupling model
Thermal coupling model；
S4) to three-dimensional electrochemical after amendment-thermal coupling model carry out 25 degree of 0.02C (since the electric current of 0.02C is minimum, this
Voltage can be considered open-circuit voltage) electric discharge emulation, the 0.02C electric discharge i.e. current value of load is 0.02 × 0.5A, stop condition setting
It is less than 3V for cell voltage, the calculating time is set as 250000s (being greater than 180000s), to guarantee that battery reaches lower voltage limit 3V
And stop calculating, the voltage-time data of simulation result is handled to obtain SOC-OCV data；
Three-dimensional electrochemical-thermal coupling model 0.02C electric discharge emulation, voltage-vs-time emulate data handling procedure after amendment
Are as follows: SOC=1-t/ttot, ttotFor total discharge time, the voltage of t moment thus SOC state when OCV, to obtain SOC-OCV
Data, i.e. 10%SOC, 20%SOC, 30%SOC, 40%SOC, 50%SOC, 60%SOC, 70%SOC, 80%SOC, 90%
The OCV value of SOC is respectively E1, E2, E3, E4, E5, E6, E7, E8, E9；
S5 DCR emulation) is carried out to three-dimensional electrochemical after amendment-thermal coupling model, simulation result is handled to obtain
DCR emulates data；
According to the SOC-OCV data obtained in step S4), revised three-dimensional electrochemical-thermal coupling model, setting are utilized
Parametrization scanning, sweep parameter are the initial voltage of battery, and the initial voltage of battery is open-circuit voltage, i.e. E1, E2, E3, E4,
E5,E6,E7,E8,E9；Pulsed discharge emulation is carried out, current value is -0.5A, and the calculating time is 18s, and stop condition is set as electricity
Cell voltage is less than 3V.The processing of simulation result voltage-time data: filtering out the voltage for finish time of discharging under each SOC state,
I.e. 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, the voltage difference of finish time of discharging under 90%SOC state
It is denoted as U1, U2, U3, U4, U5, U6, U7, U8, U9.
The calculating of DCR, the DCR=of 10%SOC | U1-E1 |/22A, according to DCR=| and U1-E1 | the calculation method of/22A, point
It Ji Suan not 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, the DCR of 90%SOC 18s 1C pulsed discharge.
Be as shown in Figure 1 embodiment 1C 18s pulsed discharge DCR simulation result and experimental result comparison diagram, lithium of the present invention from
The emulation mode error of sub- battery DCR test is small, and tests DCR by emulation experiment, not only shortens the testing time, but also save
Experimental cost.
Claims (4)
1. a kind of emulation mode of lithium ion battery DCR test, characterized by the following steps:
S1 the voltage-vs-time experimental data of tested battery room temperature multiplying power discharging) is obtained；
S2 three-dimensional electrochemical-thermal coupling model of tested battery) is established according to the parameter for being tested battery, and is carried out room temperature multiplying power and put
The voltage-vs-time that electricity emulation obtains room temperature multiplying power discharging emulates data；
S3) comparison step S1) in be tested the voltage-vs-time experimental data and step S2 of battery) in three-dimensional electrochemical-thermal coupling mold
The voltage-vs-time emulation data of type are modified three-dimensional electrochemical-thermal coupling model to obtain revised three-dimensional electrochemical-heat
Coupling model；
S4 room temperature) is carried out to revised three-dimensional electrochemical-thermal coupling model and is emulated no more than 0.02C electric discharge, emulation is tied
The voltage-time data of fruit is handled to obtain SOC-OCV data；
S5 DCR emulation) is carried out to revised three-dimensional electrochemical-thermal coupling model, to the voltage-time data of simulation result into
Row processing is to obtain DCR emulation data.
2. the emulation mode of lithium ion battery DCR test according to claim 1, it is characterised in that: the room temperature multiplying power is put
The number of plies of positive plate in current value=2 × tested battery 1C load current value/tested battery of 1C electric discharge load is emulated when electric.
3. the emulation mode of lithium ion battery DCR test according to claim 1, it is characterised in that: the step S4) in,
It discharges no more than 0.02C and emulates voltage-time data treatment process are as follows: SOC=1-t/ttot, ttotFor total discharge time, t moment
Voltage thus SOC state when OCV, obtain SOC-OCV data, i.e. 10%SOC, 20%SOC, 30%SOC, 40%SOC,
The OCV value of 50%SOC, 60%SOC, 70%SOC, 80%SOC, 90%SOC be respectively E1, E2, E3, E4, E5, E6, E7, E8,
E9。
4. the emulation mode of lithium ion battery DCR test according to claim 1, it is characterised in that: the step S5) in,
DCR emulation is based on revised three-dimensional electrochemical-thermal coupling model, utilizes the SOC-OCV data obtained in step S4), setting
Parametrization scanning, sweep parameter are the initial voltage of battery, and initial voltage is the open-circuit voltage of battery, and it is imitative to carry out pulsed discharge
Very, current value is the current value of DCR experiment, calculates the burst length that the time is DCR experiment；
The processing of DCR simulation result voltage-time data: the voltage for finish time of discharging under each SOC state is filtered out, i.e.,
10%, the voltage of finish time of 20%, 30%, 40%, 50%, 60%, 70%, 80%, discharging under 90%SOC state is remembered respectively
For U1, U2, U3, U4, U5, U6, U7, U8, U9；
According to DCR=| △ U | the calculation formula of/I, wherein △ U thus SOC state pulse electric discharge finish time voltage and this
The difference of OCV under SOC state, I are the electric current of DCR test, are calculated corresponding under SOC state in one group of SOC-OCV data of scanning
The DCR of pulsed discharge, the i.e. DCR=of 10%SOC | U1-E1 |/I, according to DCR=| and U1-E1 |/I calculation method calculates separately
10%, 20%, 30%, 40%, 50%, 60%, 70%, the 80%, DCR under 90%SOC state.
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| CN111428335A (en) * | 2020-01-19 | 2020-07-17 | 蜂巢能源科技有限公司 | Joint simulation method and device for battery module |
| CN113359038A (en) * | 2021-02-23 | 2021-09-07 | 万向一二三股份公司 | Lithium ion battery discharge and connecting piece heat production verification method |
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Application publication date: 20190816 |