CN113013470B - Lithium ion power battery cell grouping method - Google Patents
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
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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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- 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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention discloses a battery core matching method of a lithium ion power battery, which comprises the following steps: charging and discharging the battery cell to obtain charging and discharging polarization voltage, and calculating a polarization resistance ratio; grading the battery cell according to the polarization resistance ratio r of the battery cell; rejecting abnormal points of the retention quantity, the alternating current internal resistance and the self-discharge parameters of the battery cell after grading; automatically grouping the cells of the same level in series and parallel; compared with a method for grouping by capacity, the polarization impedance of the battery cell in the actual charging and discharging process is considered and added into the matching group, the whole capacity exertion of the battery cell pack is obviously improved, the original capacity conversion rate of 85-92% is improved to 93-95%, the heat production of a module is reduced, and the internal consumption is reduced. The operation is simple and easy.
Description
Technical Field
The invention belongs to the technical field of lithium ion power batteries, and particularly relates to a battery core matching method of a lithium ion power battery.
Background
The lithium ion power battery as an environment-friendly battery has the advantages of high energy density, high working voltage, high safety performance, long service life and the like.
At present, the commonly used matching scheme in the lithium battery industry is basically to group by capacity, and scattered points are only removed from parameters such as liquid retention capacity, internal resistance, self-discharge and shipment voltage of a battery cell. The matching scheme only considers the static state of the battery cell and ignores the dynamic change of the battery cell in the working process. Therefore, the capacity of the lithium ion battery cells after being assembled is reduced compared with the capacity of the single battery cells, the phenomenon of insufficient driving mileage of a vehicle is directly caused, and the production cost of the single battery cells is increased.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for matching battery cores of a lithium ion power battery. The rebound voltage of the battery cell near the upper limit of the charging voltage and near the lower limit of the discharging voltage reflects the polarization internal resistance of the battery cell, and the polarization internal resistance can reflect the attenuation speed, so that the battery cells after being matched can be ensured to achieve the purpose of synchronous attenuation through rebound voltage grouping, and the capacity conversion rate is improved.
The technical scheme adopted by the invention is as follows:
a lithium ion power battery cell grouping method comprises the following steps:
(1) Charging and discharging the battery cell to obtain charging and discharging polarization voltage, and calculating a polarization resistance ratio;
(2) Grading the battery cell according to the polarization resistance ratio r of the battery cell;
(3) Rejecting abnormal points of the retention quantity, the alternating current internal resistance and the self-discharge parameters of the battery cell after grading;
(4) And automatically grouping the cells of the same level in series and parallel.
Further, the step (1) specifically includes the steps of:
(1-1) standing a battery cell to be assembled;
(1-2) charging with constant current at 0.5-1C to a specified voltage V A ；
(1-3) standing, and testing the voltage V of the cell after standing 1 ；
(1-4) fully charging with 0.1-0.5C current;
(1-5) then carrying out constant voltage charging under the full charging voltage in the step (1-4) until the current is reduced to 0.02-0.05 ℃;
(1-6) standing;
(1-7) constant current discharging is carried out by 0.5-1C current, and the constant current is discharged to a specified voltage V B ；
(1-8) standing, and testing the voltage V of the cell after standing 2 ；
(1-9) carrying out constant current discharge at a current of 0.1-0.5 ℃ to cut-off lower limit voltage;
(1-10) standing;
(1-11) calculating a polarization resistance ratio, r = (V) A -V 1 )/(V 2 -V B )。
In step (1-2), V A The upper limit voltage of the battery cell is (0.1-0.5) V.
In step (1-7), V B The lower limit voltage of the battery cell is + (0.1-0.5) V.
In the step (2), the polarization resistance ratios r of all the battery cores are grouped from low to high at intervals of 0.1-0.5.
And (3) rejecting the battery cells with the reserved quantity, the alternating current internal resistance and the self-discharge respectively outside the reserved quantity average value +/-3 sigma, outside the alternating current internal resistance average value +/-3 sigma and outside the self-discharge average value +/-3 sigma.
The standing time is at least 5min.
And (4) randomly selecting the battery cells from the battery cells of the same level to form a unit module.
The lithium ion power battery obtained by the grouping method improves the whole capacity exertion of the battery cores after grouping.
Compared with the prior art, the invention considers the polarization impedance in the actual charging and discharging process of the battery cell and adds the polarization impedance to the matching group, and compared with a method of grouping by capacity, the invention obviously improves the whole capacity exertion of the battery cell package, improves the original capacity conversion rate of 85-92 percent to 93-95 percent, reduces the heat production of a module and reduces the internal consumption. The operation is simple and easy.
Drawings
Fig. 1 is a flowchart of a method for matching battery cells of a lithium ion power battery in the present invention;
FIG. 2 is a temperature change curve during discharge of lithium ion cells obtained by the grouping method in example 1 and comparative example 1;
fig. 3 is a temperature change curve during discharge of the lithium ion cells obtained by the grouping method in example 2 and comparative example 2.
Detailed Description
The conditions of the charge and discharge test and the capacity conversion rate in each of the examples and comparative examples were calculated as follows:
charging and discharging test conditions: 1. charging the module to the upper limit voltage of the module (the upper limit of the voltage of the single battery cell is connected in series) by a constant current of 1C; 2. charging at an upper limit voltage until the current is reduced to 0.05C;3. standing for 5min;4. discharging the module to a module lower limit voltage (lower voltage limit of the monomer battery cells) by using a 1C current constant current, wherein the capacity value obtained in the step is the capacity value of the module; 5. standing for 5min;
capacity conversion rate = module capacity/minimum single-cell capacity (minimum capacity value among the single cells constituting the module);
remarking: the upper and lower voltage limits of the single battery cell are determined by the main materials of the battery cell with positive and negative poles, and the upper and lower voltage limits of lithium iron phosphate in the example are as follows: 3.65V,2.5V; the upper and lower limit voltages of the nickel cobalt lithium manganate are as follows: 4.2V,2.8V;
the temperature rise curves in the discharge process in each example and comparative example were obtained in the following manner:
and (4) monitoring the large-area temperature of the battery cell by using a multi-path temperature measuring instrument while performing the charging and discharging, and intercepting the temperature change corresponding to the step 4 to make a temperature rise curve.
The present invention will be described in detail with reference to examples.
A lithium ion power battery cell grouping method comprises the following steps:
(1) The method comprises the following steps of charging and discharging the battery cell, obtaining charging and discharging polarization voltage, and calculating a polarization resistance ratio, specifically:
(1-1) standing the battery cell to be assembled for at least 5min;
(1-2) charging with 0.5-1C current at constant current to a specified voltage V A ，V A The upper limit voltage of the battery cell is (0.1-0.5) V;
(1-3) standing for at least 5min, and testing the voltage V of the cell after standing 1 ；
(1-4) fully charging at 0.1-0.5 ℃ current;
(1-5) constant voltage charging is carried out under the full charging voltage in the step (1-4) until the current is reduced to 0.02-0.05 ℃;
(1-6) standing for at least 5min;
(1-7) constant current discharging is carried out at a current of 0.5-1C, and the constant current is discharged to a specified voltage V B ，V B The lower limit voltage of the battery cell is + (0.1-0.5) V;
(1-8) standing for at least 5min, and testing the voltage V of the cell after standing 2 ；
(1-9) carrying out constant current discharge at a current of 0.1-0.5 ℃ to cut-off lower limit voltage;
(1-10) standing for at least 5min;
(1-11) calculating a polarization resistance ratio, r = (V) A -V 1 )/(V 2 -V B )。
(2) Classifying the battery cell according to the polarization resistance ratio r of the battery cell: and grouping the polarization resistance ratios r of all the battery cores from low to high at intervals of 0.1-0.5.
(3) Removing the battery cores with the preserved quantity, the alternating current internal resistance and the self-discharge respectively outside the preserved quantity average value +/-3 sigma, the alternating current internal resistance average value +/-3 sigma and the self-discharge average value +/-3 sigma from the graded battery cores;
(4) And randomly selecting the battery cells from the battery cells at the same level to form a unit module.
The present invention will be described in detail below with reference to examples and comparative examples.
Example 1[ lithium iron phosphate-energy storage crust ]
A matching method of 100Ah lithium iron phosphate energy storage hard shell battery cells comprises the following steps:
(1) The method comprises the following steps of performing a special charging and discharging process on all the battery cores to be assembled, specifically:
(1-1) standing for 5min;
(1-2) constant current charging of 50A to 3.55V;
(1-3) standing for 5min; and testing the voltage V of the battery cell at the moment 1 ，V 1 Are all in the range of 3.35-3.38V;
(1-4) constant current charging of 10A to 3.65V;
(1-5) charging to 5A at a constant voltage of 3.65V;
(1-6) standing for 5min;
(1-7) discharging the 50A at constant current to 2.7V;
(1-8) standing for 5min; and testing the voltage V of the battery cell at the moment 2 ，V 2 Are all in the range of 2.60-2.90V;
(1-9) discharging 10A at constant current to 2.5V;
(1-10) standing for 5min;
(1-11) selecting the voltage V in the step (1-3) according to the charging and discharging process 1 And voltage V of step (1-8) 2 Calculating the polarization resistance ratio r = (3.55-V) 1 )/(V 2 -2.5V); the r value is in the range of 0.5 to 1.3;
(2) The polarization resistance ratio r of all the battery cells is divided into a plurality of levels such as 1, 2 and 3 from low to high at intervals of 0.2;
(3) Rejecting abnormal points of parameters such as cell holding capacity, alternating current internal resistance and self-discharge from the classified cells: the battery cell with the capacity of 500 +/-3 g, the alternating current internal resistance of 0.2-0.3 m omega and the self-discharge of-0.2 mV/h is characterized in that the capacity, the alternating current internal resistance and the self-discharge are all within the capacity mean value +/-3 sigma, the alternating current internal resistance mean value +/-3 sigma and the self-discharge mean value +/-3 sigma;
(4) And randomly selecting the battery cells from the battery cells at the same level to form a unit module.
Carry out the charge-discharge test to 3 minimum unit modules of 2 strings that constitute by 6 electric cores in this embodiment and calculate its capacity conversion rate's mean value and use multichannel thermoscope to monitor the temperature variation of electric core in the charge-discharge process, the mean value of capacity conversion rate has improved 4.2% than comparative example 1.
Example 2[ lithium nickel cobalt manganese-Power Soft pack ]
A matching method of 40Ah nickel cobalt lithium manganate power soft-packaged battery cells comprises the following steps:
(1) The method comprises the following steps of performing a special charging and discharging process on all the battery cores to be assembled, and specifically performing the following steps:
(1-1) standing for 5min;
(1-2) 20A is charged to 4.0V by constant current;
(1-3) standing for 5min; and testing the voltage V of the battery cell at the moment 1 ，V 1 Are all in the range of 3.7-3.85V;
(1-4) constant current charging of 4A to 4.2V;
(1-5) charging to 2A at a constant voltage of 4.2V;
(1-6) standing for 5min;
(1-7) discharging the 20A at constant current to 3.0V;
(1-8) standing for 5min; and testing the voltage V of the battery cell at the moment 2 ，V 2 Are all in the range of 3.1-3.3V;
(1-9) discharging 4A at constant current to 2.8V;
(1-10) standing for 5min;
(1-11) selecting the voltage V in the step (1-3) according to the charging and discharging process 1 And voltage V of step (1-8) 2 Calculating the polarization resistance ratio r = (3.55-V) 1 )/(V 2 -2.5V), r is in the range of 0.5 to 3;
(2) The polarization resistance ratio r of all the battery cores is divided into a plurality of levels such as 1, 2, 3 and the like from low to high at intervals of 0.5;
(3) Rejecting abnormal points of parameters such as cell holding capacity, alternating current internal resistance and self-discharge from the classified cells: the battery cell with the capacity of 120 plus or minus 3g, the alternating current internal resistance of 0.5 to 0.7m omega and the self-discharge of 0 to 0.2mV/h, namely the battery cell with the capacity, the alternating current internal resistance and the self-discharge within the capacity mean value plus or minus 3 sigma, the alternating current internal resistance mean value plus or minus 3 sigma and the self-discharge mean value plus or minus 3 sigma is kept;
(4) And randomly selecting the battery cells from the battery cells at the same level to form a unit module.
The 3 minimum unit modules of 2 strings composed of 6 electric cores in the embodiment are subjected to charge and discharge tests to calculate the mean value of the capacity conversion rate, and a multi-channel thermodetector is used for monitoring the temperature change of the electric cores in the charge and discharge processes, wherein the mean value of the capacity conversion rate is improved by 4.5% compared with that of the comparative example 1.
Comparative example 1[ lithium iron phosphate-energy storage crust ]
A matching method of 100Ah lithium iron phosphate energy storage hard shell battery cells comprises the following steps:
(1) Selecting the battery cell with the performance parameter meeting the following standard: keeping the quantity of the cells within 500 +/-3 g, the alternating current internal resistance of 0.2-0.3 m omega and the self-discharge of-0.2 mV/h, namely keeping the quantity, the alternating current internal resistance and the self-discharge within +/-3 sigma of the quantity average value, +/-3 sigma of the alternating current internal resistance average value and +/-3 sigma of the self-discharge average value;
(2) Grading the capacity: the capacity mean-3 sigma is used as a lower grading limit, the capacity mean +3 sigma is used as an upper grading limit, the capacity mean-3 sigma + m 2Ah is automatically graded, m is grade, and m =1, 2 and 3 … ….
(3) And randomly selecting the battery cells from the battery cells at the same level to form a unit module.
The 3 minimum unit modules of 2 strings composed of 6 cells in the comparative example were subjected to charge-discharge testing to calculate the mean value of the capacity conversion rate, and the temperature change of the cells in the charge-discharge process was monitored using a multichannel thermometer, with the results shown in table 1.
Comparative example 2[ lithium nickel cobalt manganese oxide-Power Soft pack ]
A matching method of 40Ah nickel cobalt lithium manganate power soft-packaged battery cells comprises the following steps:
(1) Selecting the cells with performance parameters meeting the following standards: the battery cell with the capacity of 120 plus or minus 3g, the alternating current internal resistance of 0.5 to 0.7m omega and the self-discharge of 0 to 0.2mV/h, namely the battery cell with the capacity, the alternating current internal resistance and the self-discharge within the capacity mean value plus or minus 3 sigma, the alternating current internal resistance mean value plus or minus 3 sigma and the self-discharge mean value plus or minus 3 sigma is kept;
(2) Grading the capacity: the capacity mean-3 sigma is used as a lower grading limit, the capacity mean +3 sigma is used as an upper grading limit, the capacity mean-3 sigma + m 0.8Ah is automatically graded, m is the grade, and m =1, 2 and 3 … ….
(3) And randomly selecting the battery cells from the battery cells at the same level to form a unit module.
The 3 minimum unit modules of 2 strings composed of 6 cells in the comparative example were subjected to charge-discharge testing to calculate the mean value of the capacity conversion rate, and the temperature change of the cells in the charge-discharge process was monitored using a multichannel thermometer, with the results shown in table 1.
TABLE 1
The temperature change curves of the minimum cell module discharge processes in each of the examples and comparative examples were tested, and the results are shown in fig. 2 and 3, from which it can be seen that the temperature rise of 3 samples in examples 1 and 2 is significantly lower than that of 3 samples in comparative examples 1 and 2.
The above detailed description of a method for assembling lithium ion power battery cells with reference to the embodiments is illustrative and not restrictive, and several embodiments may be enumerated within the scope of the limitations, so that changes and modifications without departing from the general concept of the present invention shall fall within the protection scope of the present invention.
Claims (6)
1. A lithium ion power battery cell grouping method is characterized by comprising the following steps:
(1) Charging and discharging the battery cell to obtain charging and discharging polarization voltage, and calculating a polarization resistance ratio;
(2) Grading the battery cell according to the polarization resistance ratio r of the battery cell;
(3) Rejecting abnormal points of the retention quantity, the alternating current internal resistance and the self-discharge parameters of the battery cell after grading;
(4) Automatically grouping the cells of the same level in series and parallel;
the step (1) specifically comprises the following steps:
(1-1) standing a battery cell to be assembled;
(1-2) charging with 0.5-1C current at constant current to a specified voltage V A ；
(1-3) standing, and testing the voltage V of the cell after standing 1 ；
(1-4) fully charging with 0.1-0.5C current;
(1-5) then carrying out constant voltage charging under the full charging voltage in the step (1-4) until the current is reduced to 0.02-0.05 ℃;
(1-6) standing;
(1-7) constant current discharging is carried out at a current of 0.5-1C, and the constant current is discharged to a specified voltage V B ；
(1-8) standing, and testing the voltage V of the cell after standing 2 ；
(1-9) carrying out constant current discharge at a current of 0.1-0.5 ℃ to cut-off lower limit voltage;
(1-10) standing;
(1-11) calculating a polarization resistance ratio, r = (V) A -V 1 )/(V 2 -V B )；
In step (1-2), V A The upper limit voltage of the battery cell is (0.1-0.5) V;
in step (1-7), V B The lower limit voltage of the battery cell is + (0.1-0.5) V.
2. The battery cell grouping method of the lithium-ion power battery of claim 1, wherein in the step (2), the polarization resistance ratios r of all the battery cells are grouped from low to high every 0.1-0.5.
3. The battery cell grouping method of the lithium-ion power battery of claim 1, wherein in the step (3), the cells with the remaining capacity, the alternating-current internal resistance and the self-discharge respectively outside the mean value of the remaining capacity ± 3 sigma, the mean value of the alternating-current internal resistance ± 3 sigma and the mean value of the self-discharge ± 3 sigma are rejected.
4. The method for grouping lithium-ion power battery cells according to claim 1, wherein the standing time is at least 5min.
5. The battery cell grouping method of the lithium-ion power battery of claim 1, wherein in the step (4), the battery cells are randomly selected from the battery cells of the same level to form the unit module.
6. A lithium ion power cell assembled by the assembly method of any one of claims 1 to 5.
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