CN112993423B - 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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- CN112993423B CN112993423B CN202110191727.2A CN202110191727A CN112993423B CN 112993423 B CN112993423 B CN 112993423B CN 202110191727 A CN202110191727 A CN 202110191727A CN 112993423 B CN112993423 B CN 112993423B
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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 30min; 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 cell module of a lithium ion battery, and the method creatively carries out special charge and discharge treatment on grouped cells, so that the capacity conversion rate is obviously improved, and the heat production in the discharge process of the cell module is reduced.
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 30min. 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 improving the discharge cut-off voltage, and the risk of over-charge or over-discharge 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) 0.05-0.3C charging to 15-20% SOC;
(3) Standing;
(4) 0.5-1C constant current charging to 70-85% SOC;
(5) Standing;
(6) Charging the battery to an upper limit cut-off voltage (single-core upper limit voltage) by 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) Constant current discharging at 0.5-1C to 75-85% SOC;
(10) Standing;
(11) Discharging constant current of 0.05-0.3C to lower limit cut-off voltage (single-core lower limit voltage) in series;
(12) And (5) standing.
In the step (8) and the step (12), the standing time is at least 30min.
In the step (1), the step (3), the step (5) and the step (10), the standing time is at least 5min.
For a 100Ah lithium iron phosphate cell, the method specifically comprises the following steps:
(1) Standing the 2-string electric core mould group for 5min;
(2) Charging to 6.2V at 10A;
(3) Standing for 5min;
(4) 100A is charged to 6.8V by constant current;
(5) Standing for 5min;
(6) Charging to 7.3V by a 10A constant current;
(7) Charging to 5A at 7.3V constant voltage;
(8) Standing for 90min;
(9) Discharging to 5.8V at 100A constant current;
(10) Standing for 5min;
(11) Discharging to 5V at 10A constant current;
(12) Standing for 90min.
For a 40Ah lithium nickel cobalt manganate battery cell, the method specifically comprises the following steps:
(1) Standing the 2-string electric core mould group for 5min;
(2) 4A is charged to 7.0V;
(3) Standing for 5min;
(4) Charging to 8V at 40A constant current;
(5) Standing for 5min;
(6) 2A is charged to 8.4V by constant current;
(7) Charging to 0.8A at 8.4V;
(8) Standing for 90min;
(9) Discharging to 6.6V at constant current of 40A;
(10) Standing for 5min;
(11) Discharging to 5.6V at 10A constant current;
(12) Standing for 90min.
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 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 retention amount 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 method comprises the steps of automatically grading the volume mean value-3 sigma + m + 2Ah by taking the volume mean value-3 sigma as a grading lower limit and the volume mean value +3 sigma as a grading upper limit, wherein m is grade, and m =1, 2 and 3 \8230; 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 5min;
(2) Charging to 6.2V at 10A;
(3) Standing for 5min;
(4) Charging to 6.8V at 100A constant current;
(5) Standing for 5min;
(6) Charging to 7.3V by a 10A constant current;
(7) Charging to 5A at 7.3V constant voltage;
(8) Standing for 90min;
(9) Discharging 100A to 5.8V at constant current;
(10) Standing for 5min;
(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; capacity conversion = module capacity/minimum single-cell capacity (the value of the minimum capacity among the single cells constituting the module, the results are shown in table 1, with an average conversion increase of 8.3% compared to comparative example 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 cell module capacity, the preparation method of 40Ah nickel cobalt lithium manganate power soft-packaged cell module is: selecting the cells with performance parameters meeting the following standards: 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 method comprises the steps of automatically grading the volume mean value-3 sigma + m 0.8Ah by taking the volume mean value-3 sigma as a grading lower limit and the volume mean value +3 sigma as a grading upper limit, wherein m is the grade, and m =1, 2 and 3 \8230; 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 5min;
(2) 4A is charged to 7.0V;
(3) Standing for 5min;
(4) Charging to 8.0V at 40A constant current;
(5) Standing for 5min;
(6) 2A, charging to 8.4V by constant current;
(7) Charging to 0.8A at 8.4V;
(8) Standing for 90min;
(9) 40A is discharged to 6.6V in constant current;
(10) Standing for 5min;
(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 5min;
(2) Charging to 7.3V by 100A constant current;
(3) Charging to 5A at 7.3V constant voltage;
(4) Standing for 30min;
(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 5min;
(2) 40A is charged to 8.4V by constant current;
(3) 8.4V constant voltage charging to 2A;
(4) Standing for 30min;
(5) Discharging to 5.6V at constant current of 40A;
(6) Standing for 90min, and ending 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 figures 1 and 2, from which it can be seen that the temperature rise of the 3 samples in examples 1 and 2 is significantly lower than that of the 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 (3)
1. A method for improving the capacity of a 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 a cell is improved, and the static time between charging and discharging is controlled to be at least 30min;
the method comprises the following steps:
(1) Standing the battery cell module;
(2) Charging to 15-20% SOC at 0.05-0.3C;
(3) Standing;
(4) Charging at constant current of 0.5 to 1C until SOC reaches 70 to 85 percent;
(5) Standing;
(6) Charging to the upper limit cut-off voltage at a constant current of 0.05 to 0.3 ℃;
(7) Charging to 0.02 to 0.05C at constant voltage under the voltage of the step (6);
(8) Standing;
(9) Discharging at constant current of 0.5 to 1C until the SOC is 75 to 85 percent;
(10) Standing;
(11) Discharging at constant current of 0.05-0.3C to lower limit cut-off voltage;
(12) Standing;
in the step (8) and the step (12), the standing time is at least 30min;
in the step (1), the step (3), the step (5) and the step (10), the standing time is at least 5min.
2. The method for improving the capacity of a lithium ion battery cell module according to claim 1, wherein for a 100Ah lithium iron phosphate cell, the method specifically comprises the following steps:
(1) Standing the 2-string electric core mould group for 5min;
(2) Charging to 6.2V at 10A;
(3) Standing for 5min;
(4) 100A is charged to 6.8V by constant current;
(5) Standing for 5min;
(6) Charging to 7.3V by a 10A constant current;
(7) Charging to 5A at 7.3V constant voltage;
(8) Standing for 90min;
(9) Discharging to 5.8V at 100A constant current;
(10) Standing for 5min;
(11) Discharging to 5V at 10A constant current;
(12) Standing for 90min.
3. The method of claim 1, wherein for a 40Ah lithium nickel cobalt manganese oxide cell, the method comprises the following steps:
(1) Standing the 2-string electric core mould group for 5min;
(2) 4A is charged to 7.0V;
(3) Standing for 5min;
(4) Charging to 8V at 40A constant current;
(5) Standing for 5min;
(6) 2A is charged to 8.4V by constant current;
(7) Charging to 0.8A at 8.4V constant voltage;
(8) Standing for 90min;
(9) Discharging to 6.6V at constant current of 40A;
(10) Standing for 5min;
(11) Discharging to 5.6V at 10A constant current;
(12) Standing for 90min.
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| CN105048019A (en) * | 2015-09-22 | 2015-11-11 | 宁德新能源科技有限公司 | Charging method for lithium ion battery |
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| CN104037464A (en) * | 2014-06-19 | 2014-09-10 | 合肥国轩高科动力能源股份公司 | Formation method of lithium ion battery |
| CN108258346A (en) * | 2016-12-29 | 2018-07-06 | 宁德新能源科技有限公司 | Secondary battery charging method |
| CN111883866A (en) * | 2020-09-08 | 2020-11-03 | 湖北亿纬动力有限公司 | Lithium ion battery formation process and lithium ion battery obtained by same |
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