CN111106404A - Floating charge optimization method for lithium iron phosphate battery - Google Patents
Floating charge optimization method for lithium iron phosphate battery Download PDFInfo
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- CN111106404A CN111106404A CN201911205678.2A CN201911205678A CN111106404A CN 111106404 A CN111106404 A CN 111106404A CN 201911205678 A CN201911205678 A CN 201911205678A CN 111106404 A CN111106404 A CN 111106404A
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- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005457 optimization Methods 0.000 title claims abstract description 23
- 238000007600 charging Methods 0.000 claims abstract description 46
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 40
- 238000010277 constant-current charging Methods 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 9
- 230000003068 static effect Effects 0.000 claims description 9
- 238000010280 constant potential charging Methods 0.000 abstract description 5
- 239000013543 active substance Substances 0.000 abstract description 2
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 238000006731 degradation reaction Methods 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 239000002253 acid Substances 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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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
-
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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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
- H01M10/44—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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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a lithium iron phosphate battery floating charge optimization method, which comprises the following steps: charging the lithium battery by adopting a plurality of charging currents which are reduced in sequence until the voltage of the lithium battery reaches a preset step voltage threshold; then, carrying out floating charging on the lithium battery for a first time value; and then, performing constant current discharge on the lithium battery until the preset cut-off voltage is reached. The invention provides a floating charge optimization method for a lithium iron phosphate battery, which adopts a three-stage charging and discharging mode of 'step charging-floating charge-constant current discharging' in the floating charge recycling process of the lithium iron phosphate battery. And after the floating charge cycle reaches a certain period, deep discharge and constant-current and constant-voltage charging are carried out once, and the deep discharge and constant-current and constant-voltage charging are carried out on the lithium iron phosphate battery periodically by the charging strategy, so that the degradation of active substances is reduced, the floating charge safety performance of the lithium iron phosphate battery is improved, and the cycle service life of the lithium iron phosphate battery is prolonged.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a lithium iron phosphate battery floating charge optimization method.
Background
In the field of energy storage, the storage battery is used as an emergency power supply after power failure to provide power for key equipment, the work of key switches and the equipment is guaranteed, the reliability of a system is greatly influenced, and the reliability of the equipment system is directly influenced by the reliability of the storage battery. The traditional storage battery generally adopts a lead-acid battery, and the lead-acid battery has the defects of large maintenance workload, short service life, large influence of temperature on capacity and the like. As system equipment develops to place higher demands on battery performance, conventional lead-acid batteries are becoming increasingly unsuitable. The lithium iron phosphate battery has excellent rate discharge characteristic, higher energy density and stronger temperature adaptability, and becomes a good substitute of a lead-acid battery. However, because the storage battery of the storage power station adopts floating charge management, if the charging strategy is unreasonable, the running state of the whole battery can be obviously reduced, and the phenomena of overcharge and overdischarge of the battery are formed, so that the capacity and the service life of the battery are sharply reduced.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a lithium iron phosphate battery floating charge optimization method.
The invention provides a lithium iron phosphate battery floating charge optimization method, which comprises the following steps:
s1, charging the lithium battery by adopting a plurality of sequentially reduced charging currents until the voltage of the lithium battery reaches a preset step voltage threshold;
s2, carrying out floating charging on the lithium battery for a first time value;
and S3, performing constant current discharge on the lithium battery until the preset cut-off voltage.
Preferably, step S1 specifically includes: constant-current charging is carried out on the lithium battery to a first voltage value V by adopting a first current value1And then the lithium battery is charged to a second voltage value V by adopting a second current value2And then the lithium battery is charged to the step voltage threshold V by adopting a third current value in a constant current manner3Cutting off; wherein the first current value is greater than the second current value, the second current value is greater than the third current value, V1<V2<V3。
Preferably, V1＝3.4V，V2＝3.45V，V3＝3.5V。
Preferably, the first current value is 0.6C, the second current value is 0.5C, and the third current value is 0.2C.
Preferably, after the voltage of the lithium battery reaches a preset step voltage threshold value, standing for 10s and then performing floating charging.
Preferably, step S2 specifically includes: charging the lithium battery to a preset floating charge voltage threshold value in a constant-current manner, then charging the lithium battery to a constant voltage manner until the charging current is reduced to the preset floating charge current threshold value, and then standing the lithium battery and recording the real-time voltage; and when the real-time voltage is lower than the preset static voltage value, returning to the previous step to continue floating charging, and circulating to the first time value, wherein the static voltage value is smaller than the floating charging voltage threshold value.
Preferably, in step S21, the constant current charging current is 0.1C, the floating voltage threshold is 3.65V, the floating charging current threshold is 0.01A, and the quiescent voltage value is 3.38V.
Preferably, the first time value is 60 days.
Preferably, in step S3, the discharge is performed at a constant current of 0.5C.
Preferably, in step S3, the cut-off voltage is equal to 2.0V.
The invention provides a floating charge optimization method for a lithium iron phosphate battery, which adopts a three-stage charging and discharging mode of 'step charging-floating charge-constant current discharging' in the floating charge recycling process of the lithium iron phosphate battery. And after the floating charge cycle reaches a certain period, deep discharge and constant-current and constant-voltage charging are carried out once, and the deep discharge and constant-current and constant-voltage charging are carried out on the lithium iron phosphate battery periodically by the charging strategy, so that the degradation of active substances is reduced, the floating charge safety performance of the lithium iron phosphate battery is improved, and the cycle service life of the lithium iron phosphate battery is prolonged.
Drawings
Fig. 1 is a flow chart of a lithium iron phosphate battery floating charge optimization method provided by the invention;
FIG. 2 is a flow chart of another lithium iron phosphate battery float charge optimization method proposed by the present invention;
fig. 3 is a graph of battery cycle life before and after optimization.
Detailed Description
Referring to fig. 1, in the floating charge optimization method for the lithium iron phosphate battery provided by the invention, a three-stage charging and discharging mode of 'step charging-floating charging-constant current discharging' is adopted in the floating charge cycle process of the lithium iron phosphate battery, and once deep discharging and constant current and constant voltage charging are carried out after the floating charging reaches a certain period.
The method for optimizing the floating charge of the lithium iron phosphate battery comprises the following steps.
And S1, charging the lithium battery by adopting a plurality of sequentially reduced charging currents until the voltage of the lithium battery reaches a preset step voltage threshold value.
Specifically, in this step, the lithium battery is charged to the first voltage value V by the constant current with the first current value1And then the lithium battery is charged to a second voltage value V by adopting a second current value2And then the lithium battery is charged to the step voltage threshold V by adopting a third current value in a constant current manner3Cutting off; wherein the first current value is greater than the second current value, the second current value is greater than the third current value, V1<V2<V3。
Specifically, in the present embodiment, the first current value is 0.6C, the second current value is 0.5C, and the third current value is 0.2C.
And S2, carrying out floating charging on the lithium battery for the first time value.
Specifically, referring to fig. 2, in this step, the lithium battery is charged at a constant current to a preset floating charge voltage threshold, then charged at a constant voltage until the charging current drops to the preset floating charge current threshold, and then the lithium battery is stood and the real-time voltage is recorded; and when the real-time voltage is lower than the preset static voltage value, returning to the previous step to continue floating charging, and circulating to the first time value, wherein the static voltage value is smaller than the floating charging voltage threshold value. In this embodiment, the first time value is at least 60 days.
In the present embodiment, the constant current charging current is 0.1C, and the floating charge current threshold is 0.01A.
Specifically, in this embodiment, after the step S1 is completed, the lithium battery may be left standing for a period of time and then the step S2 is performed, so as to further improve the performance of the lithium battery. Specifically, after the voltage of the lithium battery reaches a preset step voltage threshold value, the lithium battery stands still for 10s and then is subjected to floating charging.
And S3, performing constant current discharge on the lithium battery until the preset cut-off voltage. Specifically, the discharge was performed at a constant current of 0.5C in this step.
The invention is further illustrated below with reference to a specific example.
In this embodiment, V1 is 3.4V, V2 is 3.45V, V3 is 3.5V, the float voltage threshold is 3.65V, the static voltage value is 3.38V, and the cutoff voltage is 2.0V.
In this embodiment, a lithium iron phosphate 105Ah battery is taken as an example.
Step 1-step charging: charging to 3.4V at a constant current of 63A, charging to 3.45V at a constant current of 52.5A, charging to 3.5V at a constant current of 21A, stopping charging, and standing for 10 s;
step 2, floating charging:
(1) charging to a floating charging voltage of 3.65V at a constant current of 10.5A, keeping the voltage constant until the charging current is reduced to 0.01A, then laying aside, and recording the voltage after laying aside.
(2) And (3) when the BMS voltage detector detects that the static voltage of the battery is less than 3.38V at a certain moment, returning to the previous small step (1), and circulating in sequence to enable the battery to be continuously float-charged.
Step 3-constant current discharge: after 3 months of floating charge circulation, the battery is deeply charged and discharged once.
Step 4, carrying out constant volume on the battery: charging to 3.65V at a constant current of 52.5A, and stopping charging after constant voltage reaches 5.25A; after standing for 1h and discharging the battery to 2.0V at 52.5A, the discharge capacity was recorded and the capacity retention rate was calculated. If the capacity retention rate is greater than 80%, continuing from step 1 to step 4.
Fig. 3 is a comparison between the battery cycle charge-discharge life curve of the present embodiment and the conventional battery cycle charge-discharge life curve. As shown in the figure, in the present example, the capacity retention rate at the 79 th cycle of the battery charge-discharge cycle was 97.26%, and the capacity retention rate at the 79 th cycle obtained by the conventional battery charge-discharge method was 94.35%. Therefore, the floating charge optimization method provided by the invention can obviously improve the floating charge cycle life of the battery
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (10)
1. A lithium iron phosphate battery floating charge optimization method is characterized by comprising the following steps:
s1, charging the lithium battery by adopting a plurality of sequentially reduced charging currents until the voltage of the lithium battery reaches a preset step voltage threshold;
s2, carrying out floating charging on the lithium battery for a first time value;
and S3, performing constant current discharge on the lithium battery until the preset cut-off voltage.
2. The lithium iron phosphate battery floating charge optimization method according to claim 1, wherein the step S1 specifically comprises: constant-current charging is carried out on the lithium battery to a first voltage value V by adopting a first current value1And then the lithium battery is charged to a second voltage value V by adopting a second current value2And then the lithium battery is charged to the step voltage threshold V by adopting a third current value in a constant current manner3Cutting off; wherein the first current value is greater than the second current value, the second current value is greater than the third current value, V1<V2<V3。
3. The lithium iron phosphate battery float charge optimization method of claim 2, wherein V is1＝3.4V，V2＝3.45V，V3＝3.5V。
4. The lithium iron phosphate battery float charge optimization method of claim 2, wherein the first current value is 0.6C, the second current value is 0.5C, and the third current value is 0.2C.
5. The lithium iron phosphate battery floating charge optimization method of claim 1, wherein after the voltage of the lithium battery reaches a preset step voltage threshold, the lithium iron phosphate battery is kept still for 10s and then floating charge is carried out.
6. The lithium iron phosphate battery floating charge optimization method according to claim 1, wherein the step S2 specifically comprises: charging the lithium battery to a preset floating charge voltage threshold value in a constant-current manner, then charging the lithium battery to a constant voltage manner until the charging current is reduced to the preset floating charge current threshold value, and then standing the lithium battery and recording the real-time voltage; and when the real-time voltage is lower than the preset static voltage value, returning to the previous step to continue floating charging, and circulating to the first time value, wherein the static voltage value is smaller than the floating charging voltage threshold value.
7. The lithium iron phosphate battery floating charge optimization method according to claim 6, wherein in step S21, the constant current charging current is 0.1C, the floating charge voltage threshold is 3.65V, the floating charge current threshold is 0.01A, and the static voltage value is 3.38V.
8. The lithium iron phosphate battery float charge optimization method of claim 6, wherein the first time value is 60 days.
9. The lithium iron phosphate battery floating charge optimization method of claim 1, wherein in step S3, discharging is performed at a constant current of 0.5 ℃.
10. The lithium iron phosphate battery floating charge optimization method of claim 9, wherein in step S3, the cut-off voltage is equal to 2.0V.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111817334A (en) * | 2020-07-14 | 2020-10-23 | 珠海格力电器股份有限公司 | Direct-current power supply and distribution control method and system and direct-current micro data center |
| CN112180261A (en) * | 2020-09-16 | 2021-01-05 | 合肥国轩高科动力能源有限公司 | Lithium analysis detection method for lithium iron phosphate power battery |
| CN112510265A (en) * | 2020-11-06 | 2021-03-16 | 天津力神电池股份有限公司 | One-step formation hot-pressing method for improving cycle performance of soft package lithium ion battery |
| CN113161636A (en) * | 2021-02-10 | 2021-07-23 | 中国科学院金属研究所 | Low-temperature charging technology of lithium iron phosphate battery |
| CN113178926A (en) * | 2021-05-19 | 2021-07-27 | 臻懿(北京)科技有限公司 | Method and system for controlling balanced charging and discharging of communication base station |
| CN113219360A (en) * | 2021-06-02 | 2021-08-06 | 江苏中兴派能电池有限公司 | Lithium battery cycle life testing method based on floating charge strategy |
| CN114156957A (en) * | 2020-09-07 | 2022-03-08 | 北京小米移动软件有限公司 | Battery charging method, device and storage medium |
| CN117872025A (en) * | 2024-03-11 | 2024-04-12 | 天津普兰能源科技有限公司 | Capacitor self-discharge selection method, system and consistency detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111817334A (en) * | 2020-07-14 | 2020-10-23 | 珠海格力电器股份有限公司 | Direct-current power supply and distribution control method and system and direct-current micro data center |
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| CN112180261A (en) * | 2020-09-16 | 2021-01-05 | 合肥国轩高科动力能源有限公司 | Lithium analysis detection method for lithium iron phosphate power battery |
| CN112180261B (en) * | 2020-09-16 | 2022-04-12 | 合肥国轩高科动力能源有限公司 | Lithium analysis detection method for lithium iron phosphate power battery |
| CN112510265A (en) * | 2020-11-06 | 2021-03-16 | 天津力神电池股份有限公司 | One-step formation hot-pressing method for improving cycle performance of soft package lithium ion battery |
| CN113161636A (en) * | 2021-02-10 | 2021-07-23 | 中国科学院金属研究所 | Low-temperature charging technology of lithium iron phosphate battery |
| CN113161636B (en) * | 2021-02-10 | 2024-04-30 | 中国科学院金属研究所 | Low-temperature charging technology of lithium iron phosphate battery |
| CN113178926A (en) * | 2021-05-19 | 2021-07-27 | 臻懿(北京)科技有限公司 | Method and system for controlling balanced charging and discharging of communication base station |
| CN113178926B (en) * | 2021-05-19 | 2022-07-15 | 臻懿(北京)科技有限公司 | Method and system for controlling balanced charging and discharging of communication base station |
| CN113219360A (en) * | 2021-06-02 | 2021-08-06 | 江苏中兴派能电池有限公司 | Lithium battery cycle life testing method based on floating charge strategy |
| CN113219360B (en) * | 2021-06-02 | 2023-09-22 | 江苏中兴派能电池有限公司 | Lithium battery cycle life testing method based on float strategy |
| CN117872025A (en) * | 2024-03-11 | 2024-04-12 | 天津普兰能源科技有限公司 | Capacitor self-discharge selection method, system and consistency detection method |
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