CN113489082B - Lithium battery pack charging method and system - Google Patents
Lithium battery pack charging method and system Download PDFInfo
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- CN113489082B CN113489082B CN202110602874.4A CN202110602874A CN113489082B CN 113489082 B CN113489082 B CN 113489082B CN 202110602874 A CN202110602874 A CN 202110602874A CN 113489082 B CN113489082 B CN 113489082B
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- voltage
- charging
- battery pack
- lithium battery
- charger
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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
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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)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a charging method of a lithium battery pack, comprising the following steps: s1: the battery pack is connected with a charger, and the charger collects the voltage of the battery pack; s2: the battery management system is connected with the charger and is used for setting a first charging voltage, a second charging voltage and a first threshold voltage according to the voltage of the battery pack; s3: the battery management system controls the charger to charge the battery pack at a first charging voltage; s4: the battery management system controls the charger to adjust the voltage of the single battery in the battery pack when the voltage of the battery pack reaches a first threshold voltage; s5: the charger charges the lowest voltage unit in the battery pack with the second charging voltage. The invention has the beneficial effects that the battery pack with consistency problem can work normally by setting the battery management system to control the lithium battery pack in real time, the problems of undervoltage, overcharging and the like are not easy to occur, the service life of the whole battery pack is prolonged, and the reliability of the whole battery pack is increased.
Description
Technical Field
The invention relates to the technical field of lithium battery charging, in particular to a lithium battery pack charging method and system.
Background
In recent years, lithium batteries have been widely used. In the lithium ion batteries, the lithium iron phosphate battery has the advantages of good high-temperature performance, longer cycle life, large charging current, high cost performance and the like, and has great application value in a plurality of lithium ion batteries.
However, in the prior art, due to the problem of the production process, the lithium iron phosphate battery has the defects of poor consistency, easy under-voltage and overcharge of the battery, so that the whole service life and reliability of the battery pack are affected, and the safety problem is seriously caused.
Disclosure of Invention
In view of the foregoing problems in the prior art, a method and a system for charging a lithium battery are provided.
The specific technical scheme is as follows:
a lithium battery pack charging method comprising:
s1: the lithium battery pack is connected with a charger, and the charger collects the voltage of the lithium battery pack;
s2: the battery management system is connected with the charger and is used for setting a first charging voltage, a second charging voltage and a first threshold voltage according to the voltage of the lithium battery pack;
s3: the battery management system controls the charger to charge the lithium battery pack at the first charging voltage;
s4: the battery management system controls the battery charger to adjust the voltage of the single battery in the lithium battery pack when the voltage of the lithium battery pack reaches the first threshold voltage;
s5: and the charger charges the lowest voltage monomer in the lithium battery pack at the second charging voltage.
Preferably, the adjusting process in step S4 further includes an equalization adjusting process: when the voltage of a certain single battery in the lithium battery pack is higher than a second threshold voltage, the battery management system controls the single battery with the voltage higher than the second threshold voltage to discharge.
Preferably, in the charging process in step S5, the charger is charged with the second charging voltage, the charging time is a first time length, the charging is stopped and the first time length is maintained, and then the charger is charged with the second charging voltage, and the charging time is the first time length.
Preferably, the battery management system controls the charger to start charging when the lithium battery pack voltage is lower than a third threshold voltage.
Preferably, the cell voltage in the lithium battery pack is not higher than the second threshold voltage after one charging cycle.
Preferably, the total duration of the charging and stopping the charging is a fixed time.
A lithium battery pack charging system specifically comprises:
the battery management system is connected with an external power grid;
the charger is connected with the battery management system and the lithium battery pack;
and the battery management system monitors the voltage of the lithium battery pack acquired by the charger in real time.
Preferably, the battery management system monitors the voltage of the lithium battery pack collected by the charger in real time.
Preferably, the battery management system charges the lithium battery pack or voltage adjusts individual batteries in the lithium battery pack according to the voltage.
The technical scheme has the following advantages or beneficial effects: the lithium battery pack is controlled in real time by the battery management system, so that the battery pack with consistency problem can work normally, the problems of undervoltage, overcharging and the like are not easy to occur, the service life of the whole battery pack is prolonged, and the reliability of the whole battery pack is improved.
Drawings
Embodiments of the present invention will now be described more fully with reference to the accompanying drawings. The drawings, however, are for illustration and description only and are not intended as a definition of the limits of the invention.
FIG. 1 is a schematic diagram of a method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a charging process according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a first adjustment process according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a second adjustment process according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an adjustment process of a single battery of a lithium battery pack according to an embodiment of the invention;
fig. 6 is a system module according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
The present invention includes a lithium battery pack charging method, as shown in fig. 1, including:
s1: the lithium battery pack is connected with a charger, and the charger collects the voltage of the lithium battery pack;
s2: the battery management system is connected with the charger and is used for setting a first charging voltage, a second charging voltage and a first threshold voltage V1 according to the voltage of the lithium battery pack;
s3: the battery management system controls the charger to charge the lithium battery pack at a first charging voltage;
s4: the battery management system controls the charger to adjust the voltage of the single battery in the lithium battery pack when the voltage of the lithium battery pack reaches a first threshold voltage V1;
s5: the charger charges the lowest voltage single battery in the lithium battery pack at the second charging voltage.
Specifically, as shown in fig. 2, when the average voltage of the whole battery pack reaches the third threshold voltage V3, the battery pack starts to be charged to the first threshold voltage V1 by the first charging voltage, then is charged by the second charging voltage, and the charging voltage is higher than the second charging voltage.
Further, the first charging voltage and the second charging voltage are positively correlated with the number of battery strings in the lithium battery pack, and the lithium battery packs with different string numbers correspond to different first charging voltages and second charging voltages. The lithium battery packs with different serial numbers in the whole power supply system can be effectively adapted by setting the charging voltage corresponding to the serial numbers of the batteries, so that the safety of the whole system is improved, and the service life of the lithium battery packs is prolonged.
In a preferred embodiment, the adjustment process in step S4 further comprises a first adjustment process, as shown in fig. 3: when a certain cell voltage in the battery pack is higher than the second threshold voltage V2, the battery management system controls the cell voltage higher than the second threshold voltage V2 to discharge and controls the discharged cell voltage not to be lower than the third threshold voltage V3.
In a preferred embodiment, the adjustment process in step S4 further comprises a second adjustment process: when a certain cell voltage in the lithium battery pack is lower than the third threshold voltage V3 and the average voltage is higher than the fourth threshold voltage V4, the battery management system charges the cell having the voltage lower than the third threshold voltage.
In a preferred embodiment, the charging voltage during the second regulation is set to the second charging voltage.
In a preferred embodiment, as shown in fig. 4, the charging process in step S5 charges the charger with the second charging voltage for half an hour, and then stops charging for half an hour, and the charging is performed for one hour, so that the voltage of the unit cell with the lower voltage in the battery pack is adjusted to be higher than the third threshold voltage V3 and not higher than the second threshold voltage V2.
In a preferred embodiment, as shown in FIG. 5, the third threshold voltage V3 is 3.35V and the second threshold voltage V2 is 3.5V. When the voltages of the battery 12-10 and the battery 12-7 are lower than V1, the charger charges the battery 12-10 and the battery 12-7 in a second regulation mode, and the total charging time is 3 hours, and the charging is performed three times, so that the battery 12-10 and the battery 12-7 can normally work between the third threshold voltage V1 and the second threshold voltage V2. Meanwhile, when the battery 12-4 and the battery 12-9 are higher than the second threshold voltage V2, the charger controls the battery 12-4 and the battery 12-9 to discharge in a first regulation manner, so that the battery 12-4 and the battery 12-9 can normally operate between the third threshold voltage V3 and the second threshold voltage V2.
In a preferred embodiment, as shown in fig. 1, the battery management system controls the charger to start charging when the battery voltage is lower than the third threshold voltage V3.
In a preferred embodiment, the cell voltages in the battery are not higher than the second threshold voltage V2 after a charging cycle.
In a preferred embodiment, as shown in fig. 5, the total duration of charging and stopping charging in the second adjustment mode is a fixed time, and in this embodiment, the total duration is three hours, by setting the total charging duration of the fixed length, it is convenient for maintenance personnel to estimate the adjustment time of the lithium battery pack, and by adjusting the ratio of the charging duration to the duration of stopping charging in the total duration, the battery cells with different strings in different lithium battery packs are corresponding.
As shown in fig. 6, the lithium battery pack charging system specifically includes:
the battery management system 1 is connected with an external power grid 2;
and the charger 3 is connected with the battery management system 1 and the battery pack 4.
In a preferred embodiment, the battery management system monitors the voltage of the lithium battery pack collected by the charger in real time.
In a preferred embodiment, the battery management system charges the lithium battery pack or voltage regulates individual cells in the lithium battery pack based on the voltage.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the embodiments and scope of the present invention, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present invention, and are intended to be included in the scope of the present invention.
Claims (7)
1. A method of charging a lithium battery pack, comprising:
s1: the lithium battery pack is connected with a charger, and the charger collects the voltage of the lithium battery pack;
s2: the battery management system is connected with the charger and is used for setting a first charging voltage, a second charging voltage and a first threshold voltage according to the voltage of the lithium battery pack;
s3: the battery management system controls the charger to charge the lithium battery pack at the first charging voltage;
s4: the battery management system controls the battery charger to adjust the voltage of the single battery in the lithium battery pack when the voltage of the lithium battery pack reaches the first threshold voltage;
s5: the charger charges the lowest voltage monomer in the battery pack at the second charging voltage;
the adjusting process in the step S4 comprises a first adjusting process and a second adjusting process;
the first regulation process includes discharging a cell having a voltage above a second threshold voltage;
the second regulation process comprises the steps of respectively charging the single batteries with the voltages lower than a third threshold voltage;
in the second adjusting process, the total time length of the charging time length and the stopping time length is a fixed time, and the battery monomers with different serial numbers in different lithium battery packs are corresponding by respectively adjusting the duty ratio of the charging time length and the stopping time length in the total time length;
when the voltage of the lithium battery pack is lower than a third threshold voltage, the battery management system controls the charger to start charging;
and in the charging process in the step S5, the charger is charged with the second charging voltage, the charging time is a first time length, the charging is stopped and maintained for the first time length, and then the charger is charged with the second charging voltage, and the charging time is the first time length, so that the single battery with lower voltage in the lithium battery pack is higher than the third threshold voltage and not higher than the second threshold voltage.
2. The charging method according to claim 1, wherein the adjusting process in the step S4 further includes: when the voltage of the single battery in the lithium battery pack is higher than a second threshold voltage, the battery management system controls the single battery with the voltage higher than the second threshold voltage to discharge.
3. The charging method according to claim 1, wherein the adjusting process in the step S4 further includes: when the voltage of the single battery in the lithium battery pack is lower than a third threshold voltage and the average voltage of the lithium battery pack is higher than a fourth threshold voltage, the battery management system charges the single battery with the voltage lower than the third threshold voltage.
4. The method of charging of claim 3, wherein the cell voltage in the lithium battery pack is not higher than the second threshold voltage after one charging cycle.
5. A lithium battery charging system for implementing the charging method according to any one of claims 1 to 4, comprising in particular:
the battery management system is connected with an external power grid;
the charger is connected with the battery management system and the lithium battery pack;
and the charger collects the voltage of the lithium battery pack and sends the voltage to the battery management system.
6. The charging system of claim 5, wherein the battery management system monitors the voltage of the lithium battery pack collected by the charger in real time.
7. The charging system of claim 6, wherein the battery management system charges the lithium battery pack or voltage regulates individual cells in the lithium battery pack based on the voltage.
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| CN202110602874.4A CN113489082B (en) | 2021-05-31 | 2021-05-31 | Lithium battery pack charging method and system |
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