CN112993423A - Method for improving capacity of lithium ion battery cell module - Google Patents
Method for improving capacity of lithium ion battery cell module Download PDFInfo
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- CN112993423A CN112993423A CN202110191727.2A CN202110191727A CN112993423A CN 112993423 A CN112993423 A CN 112993423A CN 202110191727 A CN202110191727 A CN 202110191727A CN 112993423 A CN112993423 A CN 112993423A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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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
- H01M10/448—End of discharge regulating measures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a method for improving the capacity of a lithium ion battery cell module, which comprises the steps of carrying out variable current charging on the cell module, not fully charging every time of charging, improving the discharge cut-off voltage of a cell, and controlling the static time between charging and discharging to be at least 30 min; the invention innovatively carries out special charge and discharge treatment on the grouped battery cells, remarkably improves the capacity conversion rate and reduces the heat production in the discharge process of the battery cell module.
Description
Technical Field
The invention belongs to the technical field of lithium ion power batteries, and particularly relates to a method for improving the capacity of a lithium ion battery cell module.
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 lithium battery industry basically groups battery cells with capacity to form a battery cell module, and only eliminates scattered points of parameters such as liquid retention amount, internal resistance, self-discharge and shipment voltage of the battery cells, so that the grouped lithium ion battery cells are reduced in capacity performance compared with 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 problems, the invention provides a method for improving the capacity of a lithium ion battery cell module, and the method creatively carries out special charge and discharge treatment on grouped cells, thereby obviously improving the capacity conversion rate and reducing the heat production of the cell module in the discharge process.
The technical scheme adopted by the invention is as follows:
the method for improving the capacity of the lithium ion battery cell module is characterized in that the cell module is charged in a variable current mode, full charge is not carried out during each charging, the discharge cut-off voltage of the cell is improved, and the static time between charging and discharging is controlled to be at least 30 min. The purpose of the variable current charging is to reduce the influence of polarization accumulation, and simultaneously can reduce heat generation; the voltage difference between the battery cells can be reduced by increasing the discharge cut-off voltage, and the risk of overcharge or overdischarge of individual battery cells is reduced; the standing time between charging and discharging is prolonged to reduce the cumulative effect of heat generation of the battery core. The charge-discharge process obviously improves the capacity conversion rate and the heat generation accumulation effect.
Further, the method comprises the steps of:
(1) standing the battery cell module;
(2) charging to 15-20% SOC at 0.05-0.3C;
(3) standing;
(4) charging to 70-85% SOC at a constant current of 0.5-1C;
(5) standing;
(6) charging the battery to an upper limit cut-off voltage (single-core upper limit voltage) at a constant current of 0.05-0.3C;
(7) charging to 0.02-0.05 ℃ at a constant voltage under the voltage of the step (6);
(8) standing;
(9) discharging at constant current of 0.5-1 ℃ to 75-85% of SOC;
(10) standing;
(11) discharging at constant current of 0.05-0.3C to lower limit cut-off voltage (single-core lower limit voltage) in series connection;
(12) and (5) standing.
In the step (8) and the step (12), the standing time is at least 30 min.
In the step (1), the step (3), the step (5) and the step (10), the standing time is at least 5 min.
For a 100Ah lithium iron phosphate cell, the method specifically comprises the following steps:
(1) standing the 2-string electric core mould group for 5 min;
(2) charging to 6.2V at 10A;
(3) standing for 5 min;
(4) charging to 6.8V at 100A constant current;
(5) standing for 5 min;
(6) charging to 7.3V by a 10A constant current;
(7) charging to 5A at 7.3V constant voltage;
(8) standing for 90 min;
(9) discharging to 5.8V at 100A constant current;
(10) standing for 5 min;
(11) discharging to 5V at 10A constant current;
(12) standing for 90 min.
For a 40Ah lithium nickel cobalt manganate cell, the method specifically comprises the following steps:
(1) standing the 2-string electric core mould group for 5 min;
(2)4A is charged to 7.0V;
(3) standing for 5 min;
(4) charging to 8V at 40A constant current;
(5) standing for 5 min;
(6)2A, charging to 8.4V by constant current;
(7) charging to 0.8A at 4.2V constant voltage;
(8) standing for 90 min;
(9) discharging to 6.6V at constant current of 40A;
(10) standing for 5 min;
(11) discharging to 5.6V at 10A constant current;
(12) standing for 90 min.
Compared with the prior art, the battery cell pack has the advantages that special charging and discharging treatment is innovatively carried out on the grouped battery cells, the whole capacity exertion of the battery cell pack is obviously improved, the capacity conversion rate is improved, and the heat production in the discharging process of the battery cell module is reduced.
Drawings
Fig. 1 is a temperature change curve during discharge of the lithium ion cells in example 1 and comparative example 1;
fig. 2 is a temperature change curve during the discharge of the lithium ion cells in example 2 and comparative example 2.
Detailed Description
The present invention will be described in detail with reference to examples and comparative examples.
Example 1[ lithium iron phosphate-energy storage crust ]
A method for improving the capacity of a 100Ah lithium iron phosphate energy storage hard shell battery cell module comprises the following steps: selecting the battery cell with the performance parameter meeting the following standard: the holding capacity is 500 +/-3 g, the alternating current internal resistance is 0.2-0.3 m omega, and the self-discharge is-0.2 mV/h; the capacity mean value-3 sigma is used as a lower grading limit, the capacity mean value +3 sigma is used as an upper grading limit, the capacity mean value-3 sigma + m 2Ah is automatically graded, m is grade, and m is 1, 2 and 3 … …; randomly selecting 3 2 strings of minimum unit modules consisting of 6 battery cells from the battery cells at the same level;
the method for improving the capacity of the 100Ah lithium iron phosphate energy storage hard shell battery cell module comprises the following steps:
(1) standing the 2-string electric core mould group for 5 min;
(2) charging to 6.2V at 10A;
(3) standing for 5 min;
(4) charging to 6.8V at 100A constant current;
(5) standing for 5 min;
(6) charging to 7.3V by a 10A constant current;
(7) charging to 5A at 7.3V constant voltage;
(8) standing for 90 min;
(9) discharging to 5.8V at 100A constant current;
(10) standing for 5 min;
(11) discharging to 5V at 10A constant current;
(12) standing for 90min, and finishing the process.
Calculating the average value of the capacity conversion rate of the module; the capacity conversion rate (the minimum capacity value among the single cells constituting the module) was 8.3% higher than that of comparative example 1, as shown in table 1.
Example 2[ lithium nickel cobalt manganese oxide-Power Soft pack ]
The utility model provides a method for improving 40Ah nickel cobalt lithium manganate power soft-packaged battery cell module capacity, the preparation method of 40Ah nickel cobalt lithium manganate power soft-packaged battery cell module is: selecting the battery cell with the performance parameter meeting the following standard: the holding capacity is 120 +/-3 g, the alternating current internal resistance is 0.5-0.7 m omega, and the self-discharge is 0-0.2 mV/h; grading the capacity: the capacity mean value-3 sigma is used as a lower grading limit, the capacity mean value +3 sigma is used as an upper grading limit, the capacity mean value-3 sigma + m 0.8Ah is automatically graded, m is grade, and m is 1, 2 and 3 … …; randomly selecting 3 2 strings of minimum unit modules consisting of 6 battery cells from the battery cells at the same level;
the method for improving the capacity of the 40Ah nickel cobalt lithium manganate power soft-package battery cell module comprises the following steps:
(1) standing the 2-string electric core mould group for 5 min;
(2)4A is charged to 7.0V;
(3) standing for 5 min;
(4) charging to 8.0V at 40A constant current;
(5) standing for 5 min;
(6)2A, charging to 8.4V by constant current;
(7) charging to 0.8A at 4.2V constant voltage;
(8) standing for 90 min;
(9) discharging to 6.6V at constant current of 40A;
(10) standing for 5 min;
(11) discharging to 5.6V at 10A constant current;
(12) standing for 90min, and finishing the process.
The mean value of the capacity conversion rate of the module was calculated, and the result is shown in table 1, and the mean value of the conversion rate is increased by 7.8% compared with that of comparative example 2.
Comparative example 1[ lithium iron phosphate-energy storage hard shell ]
Selecting a 100Ah phosphoric acid battery cell energy storage hard shell battery cell, and randomly selecting the battery cells to form 3 small modules of 2 strings by the method in embodiment 1;
and then carrying out conventional charge-discharge treatment on the module and calculating the capacity conversion rate of the module, wherein the specific flow is as follows:
(1) standing for 5 min;
(2) charging to 7.3V by 100A constant current;
(3) charging to 5A at 7.3V constant voltage;
(4) standing for 30 min;
(5) discharging to 5V at 100A constant current;
(6) standing for 90min, and finishing the process.
The capacity conversion ratio of the module was calculated, and the results are shown in table 1.
Comparative example 2[ lithium nickel cobalt manganese oxide-Power Soft pack ]
Selecting a 40Ah nickel cobalt lithium manganate power soft-packaged battery cell, and randomly selecting the battery cells to form 3 small modules of 2 strings by the method in the embodiment 2;
and then carrying out conventional charge-discharge treatment on the module and calculating the capacity conversion rate of the module, wherein the specific flow is as follows:
(1) standing for 5 min;
(2) charging to 8.4V by 40A constant current;
(3)8.4V constant voltage charging to 2A;
(4) standing for 30 min;
(5) discharging to 5.6V at constant current of 40A;
(6) standing for 90min, and finishing the process.
The capacity conversion ratio of the module was calculated, and the results are shown in table 1.
TABLE 1
The temperature change curves of the minimum unit module in each embodiment and each comparative example in the discharging process are tested, a multi-channel thermodetector is used for monitoring the large-area temperature of the battery cell during charging and discharging, and the corresponding temperature change of the module from the upper limit voltage discharging to the lower limit voltage discharging is made into a temperature rise curve. The results are shown in fig. 1 and 2, 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 increasing the capacity of a cell module of a lithium ion battery with reference to 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. The method for improving the capacity of the lithium ion battery cell module is characterized in that the cell module is charged in a variable current mode, full charge is not carried out during each charging, the discharge cut-off voltage of the cell is improved, and the static time between charging and discharging is controlled to be at least 30 min.
2. The method of claim 1, wherein the method comprises the steps of:
(1) standing the battery cell module;
(2) charging to 15-20% SOC at 0.05-0.3C;
(3) standing;
(4) charging to 70-85% SOC at a constant current of 0.5-1C;
(5) standing;
(6) charging the battery to an upper limit cut-off voltage at a constant current of 0.05-0.3 ℃;
(7) charging to 0.02-0.05 ℃ at a constant voltage under the voltage of the step (6);
(8) standing;
(9) discharging at constant current of 0.5-1 ℃ to 75-85% of SOC;
(10) standing;
(11) discharging at constant current of 0.05-0.3 ℃ to lower limit cut-off voltage;
(12) and (5) standing.
3. The method for improving the capacity of the battery cell module of the lithium ion battery according to claim 2, wherein in the step (8) and the step (12), the standing time is at least 30 min.
4. The method for improving the capacity of the battery cell module of the lithium ion battery according to claim 2, wherein in the step (1), the step (3), the step (5) and the step (10), the standing time is at least 5 min.
5. The method for improving the battery cell module capacity of the lithium ion battery according to any one of claims 1 to 4, wherein for a 100Ah lithium iron phosphate battery cell, the method specifically comprises the following steps:
(1) standing the 2-string electric core mould group for 5 min;
(2) charging to 6.2V at 10A;
(3) standing for 5 min;
(4) charging to 6.8V at 100A constant current;
(5) standing for 5 min;
(6) charging to 7.3V by a 10A constant current;
(7) charging to 5A at 7.3V constant voltage;
(8) standing for 90 min;
(9) discharging to 5.8V at 100A constant current;
(10) standing for 5 min;
(11) discharging to 5V at 10A constant current;
(12) standing for 90 min.
6. The method for increasing the capacity of a lithium ion battery cell module according to any one of claims 1 to 4, wherein for a 40Ah lithium nickel cobalt manganate cell, the method comprises the following steps:
(1) standing the 2-string electric core mould group for 5 min;
(2)4A is charged to 7.0V;
(3) standing for 5 min;
(4) charging to 8V at 40A constant current;
(5) standing for 5 min;
(6)2A, charging to 8.4V by constant current;
(7) charging to 0.8A at 4.2V constant voltage;
(8) standing for 90 min;
(9) discharging to 6.6V at constant current of 40A;
(10) standing for 5 min;
(11) discharging to 5.6V at 10A constant current;
(12) standing for 90 min.
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