CN110556598A - lithium secondary battery grouping method - Google Patents
lithium secondary battery grouping method Download PDFInfo
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- CN110556598A CN110556598A CN201910847998.1A CN201910847998A CN110556598A CN 110556598 A CN110556598 A CN 110556598A CN 201910847998 A CN201910847998 A CN 201910847998A CN 110556598 A CN110556598 A CN 110556598A
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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
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells 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
- H01M10/4285—Testing apparatus
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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
- H01M10/446—Initial charging measures
-
- 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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
Abstract
the invention provides a method for grouping lithium secondary batteries, which selects batteries with similar output performance from a group consisting of batteries with similar capacities by measuring the capacity increasing speed and the capacity decreasing speed of the single batteries under the same current, improves the consistency of the output of the single batteries in a battery pack, is favorable for charging and controlling and managing the output of the battery pack, and prolongs the service life of the battery pack.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a lithium secondary battery grouping method.
background
With the rapid development of lithium secondary battery technology, lithium secondary batteries are also beginning to be widely used as power and energy storage power sources. For a high-power supply, a plurality of single batteries are usually connected in series or in parallel to form a battery pack, and the battery pack works together, and because the conditions of the plurality of single batteries are different, the charging efficiency and the output capacity of each single battery are different during the working operation, so that great challenges are brought to the output and charging management of the battery pack, and the charging and output management system is complicated and the cost is increased. Meanwhile, because the charging and output capacities of the single batteries are different, the overall charging and output of the battery pack can be seriously unbalanced along with the extension of the working time, thereby influencing the normal work of the whole battery pack.
disclosure of Invention
the invention provides a lithium secondary battery grouping method, which is characterized in that batteries with similar output performance are selected from a group consisting of batteries with similar capacity by measuring the capacity increasing speed and the capacity decreasing speed of the single batteries under the same current, so that the output consistency of the single batteries in a battery pack is improved, the charging and output control and management of the battery pack are facilitated, and the service life of the battery pack is prolonged.
the specific scheme is as follows:
A method of assembling lithium secondary batteries, comprising the steps of:
1) charging the battery with the capacity difference within the first threshold value for 8-16 hours at the current of 10-35mA, synchronously measuring the SOC (%) of the battery, and carrying out time differentiation on the SOC increment to obtain the SOC increment speed d delta SOC +/d delta t;
2) standing for 0.2-2.5h, and performing one-time grouping on the batteries with the SOC increasing speed within a second threshold value;
3) charging the batteries in the same team after the first team formation to saturation, discharging for 8-16 hours at a current of 10-35mA, synchronously measuring the SOC (%) of the batteries, and carrying out time differentiation on the reduction amount of the SOC to obtain the SOC reduction speed d delta SOC-/d delta t;
4) And standing for 0.5-2.5h, and performing secondary grouping on the batteries with the SOC reduction speed within a third threshold value.
further, the first threshold value is 0.5-3.5%.
Further, the second threshold is 1.5-8.5%.
further, the third threshold value is 2.5-6.5%.
Further, in the step 2, standing is carried out for 1 hour.
A formation and grouping method for lithium secondary batteries comprises the step of grouping single batteries by the grouping method, and the formation comprises the following steps:
(1) charging the battery to 2.7V at a constant current of 0.15-0.35C;
(2) stopping charging, and standing for 2-6 hours;
(3) charging at a constant voltage of 2.7V until the charging current becomes a trickle or less, wherein the trickle charging current is 0.03 mu A;
(4) stopping charging, and standing for 2.5-3.5 hours;
(5) carrying out alternating current charging at the frequency of 35-50Hz and the alternating voltage of 2.5-3.8V for 1.5-3.5 hours;
(6) stopping charging, and standing for 5-7 hours;
(7) Charging with a current of 0.55-0.85C until the final voltage is 4.0-4.2V;
(8) Stopping charging, and standing for 0.5-3.0 hours;
(9) And (4) charging at constant voltage by using the termination voltage of the step (7) until the charging current is below trickle, wherein the trickle charging current is 0.02 mu A;
(10) carrying out alternating current charging at the frequency of 55-85Hz and the alternating voltage of 3.8-4.4V for 2.5-6.5 hours;
(11) stopping charging, and standing for 2-6 hours;
(12) charging the battery to a stop voltage of 4.5V by a current of 0.55-0.95C in a constant current manner;
(13) stopping charging, and standing for 0.5-3 hours;
(14) discharging with 0.2-0.6C discharge current until the battery voltage is 2.1V;
(15) Repeating the steps (1) to (14) for 3 to 4 times;
(16) charging the battery to 4.5V with a charging current of 0.6-1C, and finally charging the battery for 5-6 hours at a constant voltage of 4.5V.
The invention has the following beneficial effects:
1. by arranging the battery packs with the same capacity increasing speed and capacity decreasing speed in a queue, the charging and output capacities of the batteries in the battery packs are uniformized;
2. through the formation of progressive low-rate constant-current charging and progressive constant-voltage charging, the morphology of the SEI film can be further perfected, and the SEI films which are layered and have different densities are formed, so that the embedding and the separation of lithium ions are controlled, the degradation of an electrode material structure is inhibited, and the service life of the battery is prolonged.
3. the alternating current charging formation process is adopted, and the high-frequency change of the oxidation reduction mode of the electrode material is realized through the change of the direction of current, so that the flexibility of an SEI film on the surface of the electrode material is improved, the electrode material is not easy to damage under the working condition of high-frequency charging use, the structure of the electrode material is stably protected, and the service life of a battery is prolonged.
Detailed Description
the present invention will be described in more detail below with reference to specific examples, but the scope of the present invention is not limited to these examples.
Example 1
(1) charging the battery to a voltage of 2.7V by a constant current of 0.25C;
(2) Stopping charging, and standing for 3.5 hours;
(3) charging at a constant voltage of 2.7V until the charging current becomes a trickle or less, wherein the trickle charging current is 0.03 mu A;
(4) stopping charging, and standing for 2 hours;
(5) Carrying out alternating current charging at the frequency of 50Hz and the alternating voltage of 3.5V for 2 hours;
(6) stopping charging, and standing for 5.5 hours;
(7) Charging the battery to a termination voltage of 4.0V by a current of 0.6C in a constant current manner;
(8) stopping charging, and standing for 1 hour;
(9) and (4) charging at constant voltage by using the termination voltage of the step (7) until the charging current is below trickle, wherein the trickle charging current is 0.02 mu A;
(10) carrying out alternating current charging at the frequency of 65Hz and the alternating voltage of 4.2V for 5 hours;
(11) stopping charging, and standing for 3 hours;
(12) Charging the battery to a termination voltage of 4.5V by using a current of 0.8C in a constant current manner;
(13) Stopping charging, and standing for 1.5 hours;
(14) Discharging with 0.2C discharge current until the battery voltage is 2.1V;
(15) Repeating the steps (1) to (14) for 2 times;
(16) charging the battery to 4.5V with a charging current of 0.6C, and finally charging the battery for 5 hours at a constant voltage of 4.5V.
(17) charging the battery with the capacity difference within 1% for 10 hours at the current of 15mA, synchronously measuring the SOC (%) of the battery, and carrying out time differentiation on the SOC increment to obtain the SOC increment speed d delta SOC +/d delta t;
(18) Standing for 1h, and performing one-time grouping on the batteries with the SOC increasing speed within 2%;
(19) charging the batteries in the same team after the first team formation to saturation, discharging for 15 hours at a current of 15mA, synchronously measuring the SOC (%) of the batteries, and carrying out time differentiation on the reduction amount of the SOC to obtain the SOC reduction speed d delta SOC-/d delta t;
(20) and standing for 1h, and performing secondary grouping on the batteries with the SOC reduction rate within 3%.
example 2
(1) charging the battery to 2.7V by using a current of 0.3C in a constant current manner;
(2) stopping charging, and standing for 5 hours;
(3) charging at a constant voltage of 2.7V until the charging current becomes a trickle or less, wherein the trickle charging current is 0.03 mu A;
(4) stopping charging, and standing for 5 hours;
(5) Carrying out alternating current charging at the frequency of 35Hz and the alternating voltage of 3.8V, wherein the charging time is 3.5 hours;
(6) Stopping charging, and standing for 5 hours;
(7) charging the battery to a termination voltage of 4.2V by a current of 0.6C in a constant current manner;
(8) stopping charging, and standing for 1 hour;
(9) and (4) charging at constant voltage by using the termination voltage of the step (7) until the charging current is below trickle, wherein the trickle charging current is 0.02 mu A;
(10) Carrying out alternating current charging at the frequency of 75Hz and the alternating voltage of 4.3V for 5 hours;
(11) Stopping charging, and standing for 3 hours;
(12) Charging the battery to a termination voltage of 4.5V by a current of 0.75C in a constant current manner;
(13) stopping charging, and standing for 1 hour;
(14) discharging with 0.3C discharge current until the battery voltage is 2.1V;
(15) repeating the steps (1) to (14) for 3 times;
(16) charging the battery to 4.5V with a charging current of 0.75C, and finally charging the battery for 3 hours at a constant voltage of 4.5V.
(17) charging the battery with the capacity difference within 2% for 10 hours at the current of 20mA, synchronously measuring the SOC (%) of the battery, and carrying out time differentiation on the SOC increment to obtain the SOC increment speed d delta SOC +/d delta t;
(18) Standing for 2 hours, and carrying out one-time grouping on the batteries with the SOC increasing speed within 5%;
(19) charging the batteries in the same team after the first team formation to saturation, discharging for 10 hours at 25mA current, synchronously measuring the SOC (%) of the batteries, and carrying out time differentiation on the reduction amount of the SOC to obtain the SOC reduction speed d delta SOC-/d delta t;
(20) And standing for 2 hours, and performing secondary grouping on the batteries with the SOC reduction rate within 5%.
example 3
(1) charging the battery to 2.7V by using a current of 0.5C in a constant current manner;
(2) stopping charging, and standing for 6 hours;
(3) Charging at a constant voltage of 2.7V until the charging current becomes a trickle or less, wherein the trickle charging current is 0.03 mu A;
(4) stopping charging, and standing for 2 hours;
(5) Carrying out alternating current charging at the frequency of 50Hz and the alternating voltage of 3.6V for 3 hours;
(6) stopping charging, and standing for 3 hours;
(7) charging the battery to a termination voltage of 4.2V by a current of 0.6C in a constant current manner;
(8) Stopping charging, and standing for 1 hour;
(9) and (4) charging at constant voltage by using the termination voltage of the step (7) until the charging current is below trickle, wherein the trickle charging current is 0.02 mu A;
(10) carrying out alternating current charging at the frequency of 80Hz and the alternating voltage of 4.4V for 5 hours;
(11) Stopping charging, and standing for 3 hours;
(12) charging the battery to a termination voltage of 4.5V by a current of 0.7C in a constant current manner;
(13) stopping charging, and standing for 3 hours;
(14) discharging with 0.6C discharge current until the battery voltage is 2.1V;
(15) repeating the steps (1) to (14) for 2 times;
(16) charging the battery to 4.5V with a charging current of 0.6C, and finally charging the battery for 3 hours at a constant voltage of 4.5V.
(17) Charging the battery with the capacity difference within 3% for 16 hours at the current of 35mA, synchronously measuring the SOC (%) of the battery, and carrying out time differentiation on the SOC increment to obtain the SOC increment speed d delta SOC +/d delta t;
(18) standing for 2 hours, and carrying out one-time grouping on the batteries with the SOC increasing speed within 8%;
(19) charging the batteries in the same team after the first team formation to saturation, discharging for 16 hours at a current of 35mA, synchronously measuring the SOC (%) of the batteries, and carrying out time differentiation on the reduction amount of the SOC to obtain the SOC reduction speed d delta SOC-/d delta t;
(20) and standing for 1h, and performing secondary grouping on the batteries with the SOC reduction rate within 6%.
comparative example 1:
The following steps are adopted for formation and team formation:
1)0.05C to a SOC of 20%,
2) 0.5C to a cut-off voltage of 4.3v,
3) And 4.3V constant voltage charging until the charging current is less than 0.01C.
4) And grouping the single batteries with the capacity difference within 3 percent, and testing the cycle data of the grouped battery pack.
the following table shows the test data of the examples and comparative examples, the operating temperature is 25 degrees celsius, the cycle current is 0.2C, the charge cut-off voltage is 4.5V, and the discharge cut-off voltage is 2.1V. It can be seen that compared with the comparative example adopting the conventional formation process and the grouping method, the battery of the invention shows excellent reversible capacity under the working condition of high-frequency charging and discharging, has cycle life far beyond the conventional level, and the battery pack output capacity is stable after multiple cycles.
TABLE 1
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention.
Claims (6)
1. a method of assembling lithium secondary batteries, comprising the steps of:
1) charging the battery with the capacity difference within the first threshold value for 8-16 hours at the current of 10-35mA, synchronously measuring the SOC (%) of the battery, and carrying out time differentiation on the SOC increment to obtain the SOC increment speed d delta SOC +/d delta t;
2) Standing for 0.2-2.5h, and performing one-time grouping on the batteries with the SOC increasing speed within a second threshold value;
3) Charging the batteries in the same team after the first team formation to saturation, discharging for 8-16 hours at a current of 10-35mA, synchronously measuring the SOC (%) of the batteries, and carrying out time differentiation on the reduction amount of the SOC to obtain the SOC reduction speed d delta SOC-/d delta t;
4) And standing for 0.5-2.5h, and performing secondary grouping on the batteries with the SOC reduction speed within a third threshold value.
2. A method of queuing as claimed in claim 1 wherein said first threshold is 0.5-3.5%.
3. a method of queuing as claimed in claim 1 wherein said second threshold is 1.5-8.5%.
4. a method of queuing as claimed in claim 1 wherein said third threshold is 2.5-6.5%.
5. A queuing method as claimed in claim 1 wherein in step 2, standing is for 1 h.
6. a formation and grouping method of lithium secondary batteries, comprising the grouping method of any one of claims 1 to 6.
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| CN201910847998.1A CN110556598A (en) | 2019-09-09 | 2019-09-09 | lithium secondary battery grouping method |
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| CN201910847998.1A CN110556598A (en) | 2019-09-09 | 2019-09-09 | lithium secondary battery grouping method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101814632A (en) * | 2010-05-05 | 2010-08-25 | 章森 | Cell optimizing and matching technology based on charge and discharge characteristics |
| CN102760907A (en) * | 2011-04-29 | 2012-10-31 | 广州丰江电池新技术股份有限公司 | Method for assembling rechargeable lithium battery pack |
| CN102760914A (en) * | 2012-07-20 | 2012-10-31 | 深圳市雄韬电源科技股份有限公司 | Matching method for lithium ion power batteries |
| CN102903977A (en) * | 2012-09-29 | 2013-01-30 | 江苏恒迅中锂新能源科技有限公司 | Method for assembling lithium battery |
| CN103956513A (en) * | 2014-04-15 | 2014-07-30 | 合肥恒能新能源科技有限公司 | Matching method of high-capacity lithium power batteries |
| CN105375071A (en) * | 2015-12-02 | 2016-03-02 | 南通沃能新能源科技有限公司 | Lithium battery matching method |
-
2019
- 2019-09-09 CN CN201910847998.1A patent/CN110556598A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101814632A (en) * | 2010-05-05 | 2010-08-25 | 章森 | Cell optimizing and matching technology based on charge and discharge characteristics |
| CN102760907A (en) * | 2011-04-29 | 2012-10-31 | 广州丰江电池新技术股份有限公司 | Method for assembling rechargeable lithium battery pack |
| CN102760914A (en) * | 2012-07-20 | 2012-10-31 | 深圳市雄韬电源科技股份有限公司 | Matching method for lithium ion power batteries |
| CN102903977A (en) * | 2012-09-29 | 2013-01-30 | 江苏恒迅中锂新能源科技有限公司 | Method for assembling lithium battery |
| CN103956513A (en) * | 2014-04-15 | 2014-07-30 | 合肥恒能新能源科技有限公司 | Matching method of high-capacity lithium power batteries |
| CN105375071A (en) * | 2015-12-02 | 2016-03-02 | 南通沃能新能源科技有限公司 | Lithium battery matching method |
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