CN113489082A - Lithium battery pack charging method and system - Google Patents
Lithium battery pack charging method and system Download PDFInfo
- Publication number
- CN113489082A CN113489082A CN202110602874.4A CN202110602874A CN113489082A CN 113489082 A CN113489082 A CN 113489082A CN 202110602874 A CN202110602874 A CN 202110602874A CN 113489082 A CN113489082 A CN 113489082A
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- voltage
- battery pack
- charging
- charger
- lithium battery
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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
-
- 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
-
- 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)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a lithium battery pack charging method, which comprises 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 sets 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 a charger to charge the battery pack at a first charging voltage; s4: the method comprises the steps that a charger collects voltage of a battery pack, and when the voltage of the battery pack reaches a first threshold voltage, a battery management system controls the charger to adjust voltage of single batteries in the battery pack; s5: and the charger charges the lowest voltage monomer in the battery pack at a second charging voltage. The invention has the advantages that the battery management system is arranged to control the lithium battery pack in real time, so that the battery pack with the consistency problem can also work normally, the problems of undervoltage, overcharge 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.
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. Among 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, the lithium iron phosphate battery generally has the defects of poor consistency, easy undervoltage and overcharge of the battery and the like due to the problems of the production process, so that the service life and the reliability of the whole battery pack are influenced, and the safety problem is seriously caused.
Disclosure of Invention
In view of the above problems in the prior art, a method and a system for charging a lithium battery pack are provided.
The specific technical scheme is as follows:
a lithium battery pack charging method comprises the following steps:
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 sets 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 charger to adjust the voltage of the single battery in the lithium battery pack;
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 charges at the second charging voltage for a first time period, stops charging and maintains the first time period, and then charges at the second charging voltage for the first time period.
Preferably, 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.
Preferably, the cell voltage in the lithium battery pack is not higher than the second threshold voltage after a charging period.
Preferably, the total time length of the charging and the stopping of 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;
the battery management system monitors the voltage of the lithium battery pack collected 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 regulates the voltage of 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 the consistency problem can work normally, the problems of undervoltage, overcharge 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 hereinafter with reference to the accompanying drawings. The drawings are, however, to be regarded as illustrative and explanatory only and are not restrictive of the scope of the invention.
FIG. 1 is a schematic illustration of a method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a charging process according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a first conditioning process of an embodiment of the present invention;
FIG. 4 is a schematic diagram of a second conditioning process according to an embodiment of the invention;
FIG. 5 is a schematic diagram illustrating a cell conditioning process of a lithium battery pack according to an embodiment of the present invention;
fig. 6 is a system block diagram according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The present invention includes a method for charging a lithium battery pack, 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 a charger and sets 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 a charger to charge the lithium battery pack at a first charging voltage;
s4: the method comprises the steps that the charger collects battery pack voltage, and when the voltage of the lithium battery pack reaches a first threshold voltage V1, the battery management system controls the charger to adjust the voltage of single batteries in the lithium battery pack;
s5: and the charger charges the single battery with the lowest voltage in the lithium battery pack at the second charging voltage.
Specifically, as shown in fig. 2, when the average voltage of the entire battery pack reaches the third threshold voltage V3, the battery pack starts to be charged to the first threshold voltage V1 with the first charging voltage, and then the battery pack is charged by being converted to the second charging voltage, and the charging voltage is higher than the second charging voltage.
Furthermore, the first charging voltage and the second charging power supply are positively correlated with the number of battery strings in the lithium battery pack, and the lithium battery packs with different strings correspond to different first charging voltages and second charging voltages. The charging voltage corresponding to the battery string number is set to effectively adapt to the lithium battery packs with different string numbers in the whole power supply system, the overall safety of the system is improved, and the service life of the lithium battery packs is prolonged.
In a preferred embodiment, the adjusting process in step S4 further includes a first adjusting process, as shown in fig. 3: when a certain single battery voltage in the battery pack is higher than the second threshold voltage V2, the battery management system controls the single battery with the voltage higher than the second threshold voltage V2 to discharge, and controls the discharged battery voltage not to be lower than the third threshold voltage V3.
In a preferred embodiment, the adjusting process in step S4 further includes a second adjusting process: when the voltage of a certain single battery 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 single battery with the voltage lower than the third threshold voltage.
In a preferred embodiment, the charging voltage in the second regulation process is set to the second charging voltage.
In a preferred embodiment, as shown in fig. 4, the charging process in step S5 is to charge the charger with the second charging voltage for half an hour, and then stop charging for half an hour to recharge for one hour, so as to adjust the voltage of the lower unit cell in the battery pack 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 voltage of the battery 12-10 and the battery 12-7 is lower than V1, the charger charges the battery 12-10 and the battery 12-7 in a second regulation mode, the total charging time is 3 hours, and the charging is carried out 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 mode, so that the battery 12-4 and the battery 12-9 can normally work between the third threshold 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 a third threshold voltage V3.
In a preferred embodiment, the cell voltage in the battery pack is no higher than the second threshold voltage V2 after a charge 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, in this embodiment, the total duration is three hours, the total charging duration with a fixed length is set, so that a maintainer can estimate the adjustment time of the lithium battery pack, and the battery cells with different strings in different lithium battery packs are obtained by adjusting the ratio of the charging duration to the stopping charging duration in the total duration.
A lithium battery pack charging system, as shown in fig. 6, specifically includes:
a battery management system 1 connected to 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 regulates the voltage of individual cells in the lithium battery pack based on the voltage.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. A lithium battery pack charging method is characterized by comprising the following steps:
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 sets 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 charger to adjust the voltage of the single battery in the lithium battery pack;
s5: and the charger charges the lowest voltage monomer in the battery pack at the second charging voltage.
2. The charging method according to claim, wherein the adjustment method 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 adjustment method in 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 charging method according to claim 1, wherein the charging process in step S5 is to charge the charger with the second charging voltage for a first time period, stop charging and maintain the first time period, and charge with the second charging voltage for the first time period.
5. The charging method according to claim 3, wherein the cell voltage in the lithium battery pack is not higher than the second threshold voltage after a charging cycle.
6. The charging method according to claim 4, wherein the total time period of the charging and the stopping of the charging is a fixed time.
7. A lithium battery pack charging system for implementing the charging method according to any one of claims 1 to 6, comprising:
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;
the charger collects the voltage of the lithium battery pack and sends the voltage to the battery management system.
8. The charging system of claim 7, wherein the battery management system monitors the voltage of the lithium battery pack collected by the charger in real time.
9. The charging system of claim 8, wherein the battery management system charges the lithium battery pack or regulates the voltage of individual cells of the lithium battery pack according to 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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| CN202110602874.4A CN113489082B (en) | 2021-05-31 | 2021-05-31 | Lithium battery pack charging method and system |
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2021
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| CN113489082B (en) | 2023-07-04 |
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