CN111624504A - Direct current internal resistance testing method for lithium ion battery - Google Patents
Direct current internal resistance testing method for lithium ion battery Download PDFInfo
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- CN111624504A CN111624504A CN202010499669.5A CN202010499669A CN111624504A CN 111624504 A CN111624504 A CN 111624504A CN 202010499669 A CN202010499669 A CN 202010499669A CN 111624504 A CN111624504 A CN 111624504A
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- 238000012360 testing method Methods 0.000 title claims abstract description 44
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 19
- 238000007600 charging Methods 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 36
- 238000007599 discharging Methods 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 12
- 230000001419 dependent effect Effects 0.000 claims abstract 4
- 238000010277 constant-current charging Methods 0.000 claims abstract 2
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 10
- 230000033228 biological regulation Effects 0.000 claims description 7
- 238000010998 test method Methods 0.000 claims description 4
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 3
- 230000010287 polarization Effects 0.000 description 5
- YTAHJIFKAKIKAV-XNMGPUDCSA-N [(1R)-3-morpholin-4-yl-1-phenylpropyl] N-[(3S)-2-oxo-5-phenyl-1,3-dihydro-1,4-benzodiazepin-3-yl]carbamate Chemical compound O=C1[C@H](N=C(C2=C(N1)C=CC=C2)C1=CC=CC=C1)NC(O[C@H](CCN1CCOCC1)C1=CC=CC=C1)=O YTAHJIFKAKIKAV-XNMGPUDCSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000010278 pulse charging Methods 0.000 description 1
Classifications
-
- 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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a method for testing direct current internal resistance of a lithium ion battery, which is characterized by comprising the following steps of: the method comprises the following steps: the method comprises a data acquisition step and an internal resistance calculation step, wherein the data acquisition step is used for charging and discharging through a plurality of groups of different constant currents and respectively recording voltage and capacity information in the charging and discharging process; the internal resistance calculating step includes determining a battery SOC for calculating the internal resistance; acquiring voltages corresponding to the SOC in different constant current charging processes to form a plurality of groups of data pairs with constant current matched with the voltages or acquiring voltages corresponding to the SOC in different constant current discharging processes to form a plurality of groups of data pairs with constant current matched with the voltages; and (3) calculating a coefficient k in a relation formula y of the independent variable and the dependent variable, namely kx + b by using the current as the independent variable x and the voltage as the dependent variable y through a least square method, wherein the coefficient k is the direct-current internal resistance of the battery. By adopting the testing method, the internal charging and discharging resistance of the full SOC at a certain temperature can be calculated, and more application information is provided for battery application.
Description
Technical Field
The invention relates to the field of power battery testing, in particular to a method for testing the tributary internal resistance of a lithium ion battery.
Background
The direct-current internal resistance of the lithium ion battery refers to the resistance degree of current transmitted in the battery when the lithium ion battery works, and comprises ohmic internal resistance and polarization internal resistance. The direct current internal resistance is one of important marks for measuring the battery state, and the direct current internal resistance is directly related to the performance of the battery and can be used as important bases for power performance evaluation, service life estimation, battery performance failure judgment and the like.
The existing direct current internal resistance testing method is to apply a pulse large current to a battery, measure the voltage drop or the voltage rise on the battery, and calculate the direct current internal resistance of the battery according to the ohm law R ═ U/I. The direct current internal resistance method in the national standard and international organization for standardization (ISO) comprises the following steps: and (4) pulse discharging for 18s, pulse charging for 10s, applying a discharging current which is the maximum allowable pulse current of the battery, and applying a charging current which is 0.75 time of the discharging current, and then obtaining the direct current internal resistance of the battery by dividing the voltage difference between the time end voltage and the initial voltage by the current.
The method ignores the influence of the polarization of the battery on the internal resistance during long-time charge and discharge, the difference between the polarization and the practical application (continuous charge or discharge) of the lithium ion, and the damage of large current to the battery.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for testing the direct current internal resistance of a lithium ion battery, which has accurate test result and cannot damage the service life of the battery.
In order to achieve the purpose, the invention adopts the technical scheme that: a lithium ion direct current internal resistance test method comprises the following steps:
step a, placing the battery to normal temperature, and emptying the battery according to a certain discharge system;
b, standing the battery to normal temperature;
c, fully charging the battery at normal temperature according to a certain charging system;
d, standing the battery to a test temperature;
step e, testing the current I of the battery at the temperaturedDischarging at constant current to cut-off voltage (recording the real-time voltage, capacity and other information of the battery in the process);
step f, standing the battery to a test temperature;
step g, charging the battery with current IgConstant current chargingTo cut-off voltage (recording the real-time voltage, capacity and other information of the battery in the process);
step h, standing the battery to normal temperature;
step i, emptying the battery at normal temperature according to a certain discharge system;
step j, standing the battery to normal temperature;
step k, repeating the steps c-j by adopting different currents in the step e and the step g (at least 4 different currents in each of the step e and the step g);
step l, calculating direct current internal resistance: and (3) taking the voltage of different currents under a certain SOC in the step e or the step g as a variable (y) and the current as an independent variable (x), and solving the relation between the voltage and the current by utilizing least square normal fitting: and y is k x + b, and the slope k is the direct current internal resistance at the temperature under the SOC (in the step e, the linear fitting value k of the current and the voltage is the discharging direct current internal resistance, and in the step g, the charging direct current internal resistance).
In particular, the test environment chamber or thermostatic chamber preferably gives the battery maximum thermostatic conditions. And (3) giving a test temperature environment required by the test through a test environment bin and/or a thermostatic chamber.
Specifically, one charging regime is preferably charged with a charging regime required by battery application scenarios or regulations. And charging is carried out through a charging system corresponding to the application scene of the battery or a charging system required by regulations.
Specifically, as a preference, one discharge regime is discharged in a battery application scenario or a discharge regime required by regulations. And discharging through a discharging system corresponding to the application scene of the battery or a charging system required by the laws and regulations.
In particular, as preferred, I in said step edTaking 0.1C to 0.6C.
In particular, preferably, I in step ggTaking 0.1C to 0.6C.
Specifically, it is preferable that the different current values in step k are 4.
Specifically, in step I, SOC is defined as: at the current, the battery remaining capacity is greater than the battery discharge total capacity (at the time of charging, 1 minus the battery remaining capacity is greater than the battery charge total capacity).
In particular, preferably, said step IdThe discharge capacity range of medium and different currents is less than 3%, otherwise the current range is narrowed. When selected IdIf the current difference is not consistent with the standard, the current difference is larger than 3%, so that the accuracy is influenced, and a test error is caused, so that the I is judged through the differencedWhether the requirements are met or not, and when the requirements are not met, changing the reduction IdThe current range in between.
In particular, preferably, said step IgThe charging capacity range of different current is less than 3%, otherwise the current range is reduced. When selected IgIf the current difference is not consistent with the standard, the current difference is larger than 3%, so that the accuracy is influenced, and a test error is caused, so that the I is judged through the differencegWhether the requirements are met or not, and when the requirements are not met, changing the reduction IgThe current range in between.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
by adopting the testing method, the internal charging and discharging resistance of the full SOC at a certain temperature can be calculated, and more application information is provided for battery application. The long-time low-current charge and discharge includes the influence of battery polarization on the internal resistance of the battery, so that the practical application condition of the battery can be reflected by calculating the internal resistance, and the damage of large current to the battery is also avoided. The SOC is directly obtained through calculation, and deviation cannot be generated.
Detailed Description
The following description of preferred embodiments will provide further details of the present invention.
The invention solves the problem that the current pulse direct current internal resistance test method does not consider the resistance value influence caused by polarization generated by long-time work of the battery and the SOC reference of large current. The testing method is simple and convenient, has low requirement on equipment current, and can test and calculate the full SOC direct current internal resistance value.
The invention adopts the scheme as follows: 1. emptying the battery at normal temperature according to a certain discharge system and standing to normal temperature; 2. Fully charging the battery at normal temperature according to a certain charging system; 3. standing to the testing temperature at the testing temperature; 4. discharging at a low current constant current to cut-off voltage at a test temperature; 5. standing to a test temperature; 6. charging to a cut-off voltage with a small current; 7. standing to normal temperature; 8. the battery is discharged at normal temperature according to a certain charging system; 9. standing to normal temperature; 10. repeating the steps 2-9 (at least 4 different currents) by adopting the 4 th step of different currents, 9, calculating the direct current internal resistance: and (3) taking the voltage of different currents under a certain SOC in the 4 th step or the 6 th step as a variable (y) and the current as an independent variable (x), and solving the relation between the voltage and the current by utilizing least square normal fitting: and y is k x + b, and the slope k is the direct current internal resistance at the temperature under the SOC (in the step 4, the linear fitting value k of the current and the voltage is the discharging direct current internal resistance, and in the step 6, the charging direct current internal resistance).
The embodiment provides a method for testing direct current internal resistance of lithium ions, wherein a battery is a monomer lithium iron phosphate battery cell with a rated capacity of 85Ah, and the test method comprises the following steps:
step a, standing the battery to normal temperature (25 +/-2 ℃, the same below), and discharging the battery to cut-off voltage at constant current of 1/3 ℃;
b, standing the battery to normal temperature;
step C, charging the battery to cut-off voltage at constant current of 1/3C at normal temperature, and charging to cut-off voltage by rotating to 0.05C;
step d, standing the battery to 35 ℃;
step e, discharging the battery to cut-off voltage at constant current of 0.2C at 35 ℃ (recording the real-time voltage, capacity and other information of the battery in the process);
step f, standing the battery to 35 ℃;
step g, charging the battery to a cut-off voltage at a constant current of 0.1C (recording the real-time voltage, capacity and other information of the battery in the process);
step h, standing the battery to normal temperature;
step i, discharging the battery to cut-off voltage at constant current of 1/3C at normal temperature;
step j, standing the battery to normal temperature;
and step k, repeating the step C-j by adopting different currents in the step e and the step g (taking the current in the step e as 0.2C, 0.4C, 0.5C and 0.6C, and taking the current in the step g as 0.1C, 0.2C, 0.4C and 0.5C).
Examples of different current SOC voltage values are as follows:
0.2C (17A) current discharge: the total 17A discharge capacity is 87.6Ah, the 60% SOC discharge voltage value is the voltage recorded by the equipment when the discharge capacity is 35.04Ah, and the total 40% discharge capacity is discharged.
0.4C (34A) Current charging: the total charging capacity of 34A is 86.9Ah, the value of 60% SOC charging voltage is the voltage recorded by the equipment when the total charging capacity of 40% is 34.76 Ah.
The method for calculating the direct current internal resistance comprises the following steps:
and (3) taking the voltage of different currents under a certain SOC in the step e or the step g as a variable (y) and the current as an independent variable (x), and solving the relation between the voltage and the current by utilizing least square normal fitting: and y is k x + b, and the slope k is the direct current internal resistance at the SOC at the temperature.
Table 1 shows the DC internal resistance values of several points and the linearly fitted R calculated in the examples2(the sum of squared errors, the closer this value is to 1, the stronger the linear dependence of the explanatory and independent variables) value. In addition, the table is only an example, and all the SOCs can be calculated, for example, from 50% SOC to 55% SOC, and the value taking method can be adopted.
Preferably, the test environment bin or the thermostatic chamber can provide the maximum constant temperature condition for the battery, and the test temperature environment required by the test can be provided through the test environment bin and/or the thermostatic chamber.
In the present application, a charging regime is used to charge the battery in accordance with a charging regime required by the battery application scenario or regulation.
Specifically, as a preference, one discharge regime is discharged in a battery application scenario or a discharge regime required by regulations.
In particular, as preferred, I in said step edTaking 0.1C to 0.6C.
In particular, preferably, I in step ggTaking 0.1C to 0.6C.
Specifically, it is preferable that the different current values in step k are 4.
Specifically, in step I, SOC is defined as: at the current, the battery remaining capacity is greater than the battery discharge total capacity (at the time of charging, 1 minus the battery remaining capacity is greater than the battery charge total capacity).
In particular, preferably, said step IdThe discharge capacity range of medium and different currents is less than 3%, otherwise the current range is narrowed.
In particular, preferably, said step IgThe charging capacity range of different current is less than 3%, otherwise the current range is reduced.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
TABLE 1
It can be seen from the table that the charging direct current internal resistance, the discharging direct current internal resistance and the direct current internal resistances corresponding to different SOC in the full range can be calculated, and the direct current internal resistance error obtained by the method is very small compared with that obtained by a national standard test mode, but the health loss of the battery can be reduced. And also
It is obvious that the specific implementation of the present invention is not limited by the above-mentioned manner, and various insubstantial modifications made by the method and technical scheme of the present invention are within the protection scope of the present invention.
Claims (9)
1. A lithium ion battery direct current internal resistance test method is characterized in that: the method comprises the following steps: the method comprises a data acquisition step and an internal resistance calculation step, wherein the data acquisition step is used for charging and discharging through a plurality of groups of different constant currents and respectively recording voltage and capacity information in the charging and discharging process; the internal resistance calculating step includes determining a battery SOC for calculating the internal resistance; acquiring voltages corresponding to the SOC in different constant current charging processes to form a plurality of groups of data pairs with constant current matched with the voltages or acquiring voltages corresponding to the SOC in different constant current discharging processes to form a plurality of groups of data pairs with constant current matched with the voltages; and (3) calculating a coefficient k in a relation formula y of the independent variable and the dependent variable, namely kx + b by using the current as the independent variable x and the voltage as the dependent variable y through a least square method, wherein the coefficient k is the direct-current internal resistance of the battery.
2. The method for testing the direct current internal resistance of the lithium ion battery according to claim 1, characterized in that: the data acquisition step comprises:
step a, placing the battery to normal temperature, and then controlling the battery to be emptied according to a set discharge system;
step b, standing the battery to normal temperature;
c, fully charging the battery according to a set charging system at normal temperature;
step d, standing the battery to a test temperature;
step e, at the test temperature, the battery is charged with current IdDischarging at constant current to cut-off voltage and recording the real-time voltage and capacity information of the battery in the process;
step f, standing the battery to a test temperature;
step g, controlling the battery to have current IgCharging the battery to a cut-off voltage at a constant current, and recording the real-time voltage and capacity information of the battery in the process;
step h: replacement of Id、IgAnd e, repeating the steps a to g, and recording the real-time voltage and capacity information in the steps e and g.
3. The method for testing the direct current internal resistance of the lithium ion battery according to claim 1, characterized in that: the internal resistance calculating step comprises the step of taking a plurality of groups I in the step edG, calculating the internal resistance corresponding to the voltage to obtain the direct current discharging internal resistance, and taking a plurality of groups I in the step ggAnd the internal resistance obtained by calculating the data corresponding to the voltage is the direct current charging internal resistance.
4. The method for testing the direct current internal resistance of the lithium ion battery according to claim 2, characterized in that: the charging system is set according to the discharging system corresponding to the application scene of the battery or the charging system required by the rules.
5. The method for testing the direct current internal resistance of the lithium ion battery according to claim 2, characterized in that: the set discharge system is the discharge system corresponding to the application scene of the battery or the discharge system required by the regulation.
6. The method for testing the direct current internal resistance of the lithium ion battery according to claim 2, characterized in that: in said step e IdTaking 0.1C to 0.6C.
7. The method for testing the direct current internal resistance of the lithium ion battery according to claim 2, characterized in that: in said step e IgTaking 0.1C to 0.6C.
8. The method for testing the direct current internal resistance of the lithium ion battery according to any one of claims 1 to 7, characterized in that: the constant temperature condition required by the test is controlled by a test environment bin or a constant temperature chamber.
9. The method for testing the direct current internal resistance of the lithium ion battery according to any one of claims 1 to 7, characterized in that: selected multiple IdCorresponding discharge capacity range less than 3%, otherwise current I is reduceddA range; selected multiple IgCorresponding discharge capacity range less than 3%, otherwise current I is reducedgAnd (3) a range.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113253118A (en) * | 2021-06-08 | 2021-08-13 | 欣旺达电动汽车电池有限公司 | Method and device for acquiring battery cell capacity and computer readable storage medium |
| CN113504480A (en) * | 2021-06-22 | 2021-10-15 | 盛德东南(福建)新能源科技有限公司 | Direct-current internal resistance detection method of lithium ion power storage battery |
| CN113504477A (en) * | 2021-08-03 | 2021-10-15 | 湖北亿纬动力有限公司 | Battery cell testing method, device and system |
| CN114200180A (en) * | 2021-11-11 | 2022-03-18 | 渭南高新区木王科技有限公司 | Double-end double-acting probe capable of being bent randomly |
| CN114552034A (en) * | 2021-07-21 | 2022-05-27 | 万向一二三股份公司 | Device and method for testing charging of lithium ion battery pack |
| CN116027159A (en) * | 2023-01-30 | 2023-04-28 | 宁波群芯微电子股份有限公司 | Optocoupler voltage-resistant quality control method and optocoupler voltage-resistant test circuit |
| CN116295449A (en) * | 2023-05-25 | 2023-06-23 | 吉林大学 | Method and device for indicating path of autonomous underwater vehicle |
| CN117538759A (en) * | 2024-01-10 | 2024-02-09 | 清华四川能源互联网研究院 | Method for obtaining direct-current internal resistance high flux of lithium ion battery |
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| CN113253118A (en) * | 2021-06-08 | 2021-08-13 | 欣旺达电动汽车电池有限公司 | Method and device for acquiring battery cell capacity and computer readable storage medium |
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| CN113504480A (en) * | 2021-06-22 | 2021-10-15 | 盛德东南(福建)新能源科技有限公司 | Direct-current internal resistance detection method of lithium ion power storage battery |
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| CN116027159A (en) * | 2023-01-30 | 2023-04-28 | 宁波群芯微电子股份有限公司 | Optocoupler voltage-resistant quality control method and optocoupler voltage-resistant test circuit |
| CN116027159B (en) * | 2023-01-30 | 2023-08-25 | 宁波群芯微电子股份有限公司 | Optocoupler voltage-resistant quality control method and optocoupler voltage-resistant test circuit |
| CN116295449A (en) * | 2023-05-25 | 2023-06-23 | 吉林大学 | Method and device for indicating path of autonomous underwater vehicle |
| CN117538759A (en) * | 2024-01-10 | 2024-02-09 | 清华四川能源互联网研究院 | Method for obtaining direct-current internal resistance high flux of lithium ion battery |
| CN117538759B (en) * | 2024-01-10 | 2024-03-19 | 清华四川能源互联网研究院 | Method for obtaining direct-current internal resistance high flux of lithium ion battery |
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