CN116073492B - Passive balance control method between battery cells - Google Patents
Passive balance control method between battery cells Download PDFInfo
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- CN116073492B CN116073492B CN202310352801.3A CN202310352801A CN116073492B CN 116073492 B CN116073492 B CN 116073492B CN 202310352801 A CN202310352801 A CN 202310352801A CN 116073492 B CN116073492 B CN 116073492B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 34
- 230000003068 static effect Effects 0.000 claims abstract description 26
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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Classifications
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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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- 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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
-
- 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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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- 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 relates to the technical field of power distribution, in particular to a passive equalization control method between electric cores, which comprises the steps of judging whether a lithium battery system is in a constant-voltage trickle charge mode, and if not, judging a standing equalization mode; judging whether the maximum cell voltage is greater than or equal to a first threshold value, if not, comparing the voltage with the minimum cell voltage; judging whether the minimum cell voltage is smaller than a second threshold value, if so, setting the minimum cell voltage to be in a static balance mode, and if not, exiting; comparing the voltage difference between each cell voltage and the minimum cell voltage, starting a corresponding equalization circuit of the cell with the voltage difference larger than a third threshold value, and exiting; judging whether the system is in a static equilibrium mode, if not, exiting; setting the system to a static balance mode, and reducing the charge SOP to a fourth threshold value; judging whether the maximum cell voltage is greater than or equal to a second threshold value, if not, setting a constant-voltage trickle charge mode and exiting; finding out all the battery cores which are larger than or equal to the second threshold value, starting the equalization circuit and exiting.
Description
Technical Field
The invention relates to the technical field of power distribution, in particular to a passive equalization control method between electric cores.
Background
The current lithium battery system is composed of a plurality of battery cells connected in series-parallel, and ideally, the current of each battery in the battery pack is the same. However, not all of the cells are equivalent, and even though the chemical composition, shape and size are the same, the total capacity, internal resistance, self-discharge rate, etc. may be different. In addition, the burn-in rate may be different for each cell. And the performance of the battery pack is limited by the battery cell with the lowest capacity; once the energy of a certain battery cell is exhausted, the whole battery pack can only stop discharging for protecting the battery cell, so that the balance efficiency of the battery pack is reduced, and the available capacity of all battery cells is reduced.
Disclosure of Invention
The invention aims to provide a passive equalization control method between battery cells, which aims to solve the problem of low equalization efficiency of a battery pack of the existing lithium battery system.
In order to achieve the above purpose, the invention provides a passive equalization control method between battery cells, comprising the following steps:
s1, judging whether a lithium battery system is in a constant-voltage trickle charge mode, if so, executing a step S2, and if not, judging whether the lithium battery system is in a static balance mode;
s2, judging whether the maximum cell voltage of the lithium battery system is greater than or equal to a first threshold value, if yes, executing a step S3, if not, comparing the voltage difference between each cell voltage and the minimum cell voltage, and starting a cell corresponding equalization circuit with the voltage difference greater than a third threshold value;
s3, judging whether the minimum cell voltage of the lithium battery system is smaller than a second threshold value, if yes, setting the lithium battery system to a static balance mode, reducing the charge SOP to a fourth threshold value, and if not, exiting;
s4, comparing the voltage difference between each cell voltage and the minimum cell voltage, and starting a corresponding equalization circuit of the cell with the voltage difference larger than a third threshold value;
s5, judging whether the lithium battery system is in a static balance mode, if so, setting the lithium battery system into the static balance mode, reducing the charge SOP to a fourth threshold value, and if not, exiting;
s6, setting the lithium battery system into a static balance mode, and reducing the charge SOP to a fourth threshold value;
s7, judging whether the maximum cell voltage is greater than or equal to the second threshold value, if yes, executing the step S8, and if not, setting the lithium battery system into a constant-voltage trickle charge mode and exiting;
and S8, finding out all the battery cells which are larger than or equal to the second threshold value, starting an equalization circuit of the battery cells, and exiting.
Wherein the first threshold is 3450.
Wherein the second threshold is 3400.
Wherein the third threshold is 20.
Wherein the fourth threshold is 0.
According to the passive equalization control method between the battery cores, whether the lithium battery system is in a constant-voltage trickle charge mode is judged, and if not, standing equalization mode judgment is carried out; judging whether the maximum cell voltage is greater than or equal to a first threshold value, if not, comparing the voltage with the minimum cell voltage; judging whether the minimum cell voltage is smaller than a second threshold value, if so, setting the minimum cell voltage to be in a static balance mode, and if not, exiting; comparing the voltage difference between each cell voltage and the minimum cell voltage, starting a corresponding equalization circuit of the cell with the voltage difference larger than a third threshold value, and exiting; judging whether the system is in a static equilibrium mode, if not, exiting; setting the system to a static balance mode, and reducing the charge SOP to a fourth threshold value; judging whether the maximum cell voltage is greater than or equal to a second threshold value, if not, setting a constant-voltage trickle charge mode and exiting; finding out all the battery cells which are larger than or equal to the second threshold value, starting the equalization circuit and exiting, wherein the invention is mainly used for prolonging the constant-voltage trickle charge time before the battery cells are full after the constant-voltage trickle charge is started, controlling the charge state and SOP, prolonging the starting time of the equalization circuit, and enabling the SoC of all the battery cells to reach more than 99.5 percent as far as possible to fully charge the battery. Therefore, the equalization efficiency is improved, the available capacity of all the battery cells is improved, and the available capacity of the battery pack is improved. The problem of current lithium cell system's group battery equilibrium efficiency lower is solved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a passive equalization control method between cells provided by the invention.
Fig. 2 is a schematic diagram of a passive equalization control method between cells provided by the invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Referring to fig. 1 to 2, the present invention provides a passive equalization control method between battery cells, which includes the following steps:
s1, judging whether a lithium battery system is in a constant-voltage trickle charge mode, if so, executing a step S2, and if not, judging whether the lithium battery system is in a static balance mode;
specifically, the constant voltage trickle charge mode refers to keeping the charge voltage constant and charging with a small current (within 3A) during the charging process. Therefore, the overcharge probability can be reduced, and the charge quantity can be increased.
S2, judging whether the maximum cell voltage of the lithium battery system is greater than or equal to a first threshold value, if yes, executing a step S3, if not, comparing the voltage difference between each cell voltage and the minimum cell voltage, and starting a cell corresponding equalization circuit with the voltage difference greater than a third threshold value;
specifically, the first threshold is 3450.
S3, judging whether the minimum cell voltage of the lithium battery system is smaller than a second threshold value, if yes, setting the lithium battery system to a static balance mode, reducing the charge SOP to a fourth threshold value, and if not, exiting;
specifically, the second threshold is 3400.
S4, comparing the voltage difference between each cell voltage and the minimum cell voltage, and starting a corresponding equalization circuit of the cell with the voltage difference larger than a third threshold value;
specifically, the third threshold is 20.
S5, judging whether the lithium battery system is in a static balance mode, if so, setting the lithium battery system into the static balance mode, reducing the charge SOP to a fourth threshold value, and if not, exiting;
specifically, the static balance mode refers to a state in which the battery cells are not charged or discharged, and an equalization circuit is turned on at this time, and is called a static balance mode.
S6, setting the lithium battery system into a static balance mode, and reducing the charge SOP to a fourth threshold value;
specifically, the fourth threshold is 0.
S7, judging whether the maximum cell voltage is greater than or equal to the second threshold value, if yes, executing the step S8, and if not, setting the lithium battery system into a constant-voltage trickle charge mode and exiting;
and S8, finding out all the battery cells which are larger than or equal to the second threshold value, starting an equalization circuit of the battery cells, and exiting.
According to the passive equalization control method between the battery cores, whether the lithium battery system is in a constant-voltage trickle charge mode is judged, and if not, standing equalization mode judgment is carried out; judging whether the maximum cell voltage is greater than or equal to a first threshold value, if not, comparing the voltage with the minimum cell voltage; judging whether the minimum cell voltage is smaller than a second threshold value, if so, setting the minimum cell voltage to be in a static balance mode, and if not, exiting; comparing the voltage difference between each cell voltage and the minimum cell voltage, starting a corresponding equalization circuit of the cell with the voltage difference larger than a third threshold value, and exiting; judging whether the system is in a static equilibrium mode, if not, exiting; setting the system to a static balance mode, and reducing the charge SOP to a fourth threshold value; judging whether the maximum cell voltage is greater than or equal to a second threshold value, if not, setting a constant-voltage trickle charge mode and exiting; find out all electric cores that are greater than or equal to the second threshold value, open equalization circuit and withdraw from, have solved the lower problem of equalization efficiency of the battery pack of the existing lithium battery system.
The invention is mainly used for prolonging the constant-voltage trickle charge time after the constant-voltage trickle charge starts and before the battery core is full, controlling the charge state and SOP, prolonging the starting time of the equalization circuit and enabling all the battery cores to reach more than 99.5 percent as much as possible to fully charge the battery. Therefore, the equalization efficiency is improved, the available capacity of all the battery cells is improved, and the available capacity of the battery pack is improved.
The foregoing disclosure is only a preferred embodiment of the passive equalization control method between cells, but it is not limited thereto, and those skilled in the art will understand that all or part of the procedures for implementing the above embodiments are equivalent and still fall within the scope of the invention.
Claims (5)
1. The passive equalization control method between the battery cells is characterized by comprising the following steps of:
s1, judging whether a lithium battery system is in a constant-voltage trickle charge mode, if so, executing a step S2, and if not, judging whether the lithium battery system is in a static balance mode;
s2, judging whether the maximum cell voltage of the lithium battery system is greater than or equal to a first threshold value, if yes, executing a step S3, if not, comparing the voltage difference between each cell voltage and the minimum cell voltage, and starting a cell corresponding equalization circuit with the voltage difference greater than a third threshold value;
s3, judging whether the minimum cell voltage of the lithium battery system is smaller than a second threshold value, if yes, setting the lithium battery system to a static balance mode, reducing the charge SOP to a fourth threshold value, and if not, exiting;
s4, comparing the voltage difference between each cell voltage and the minimum cell voltage, and starting a corresponding equalization circuit of the cell with the voltage difference larger than a third threshold value;
s5, judging whether the lithium battery system is in a static balance mode, if so, setting the lithium battery system into the static balance mode, reducing the charge SOP to a fourth threshold value, and if not, exiting;
s6, setting the lithium battery system into a static balance mode, and reducing the charge SOP to a fourth threshold value;
s7, judging whether the maximum cell voltage is greater than or equal to the second threshold value, if yes, executing the step S8, if not, setting the lithium battery system to a constant-voltage trickle charge mode, recovering the charge SOP and exiting;
and S8, finding out all the battery cells which are larger than or equal to the second threshold value, starting an equalization circuit of the battery cells, and exiting.
2. The method for controlling passive equalization between cells according to claim 1, wherein,
the first threshold is 3450.
3. The method for controlling passive equalization between cells according to claim 2, wherein,
the second threshold is 3400.
4. The method for controlling passive equalization between cells according to claim 3, wherein,
the third threshold is 20.
5. The method for controlling passive equalization between cells according to claim 4, wherein,
the fourth threshold is 0.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310352801.3A CN116073492B (en) | 2023-04-04 | 2023-04-04 | Passive balance control method between battery cells |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310352801.3A CN116073492B (en) | 2023-04-04 | 2023-04-04 | Passive balance control method between battery cells |
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| Publication Number | Publication Date |
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| CN116073492A CN116073492A (en) | 2023-05-05 |
| CN116073492B true CN116073492B (en) | 2023-06-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102403743A (en) * | 2010-09-15 | 2012-04-04 | 河南科隆集团有限公司 | Battery equalizing maintenance instrument of large-sized charging power supply system |
| CN201774293U (en) * | 2010-09-15 | 2011-03-23 | 河南科隆集团有限公司 | Battery balance maintenance instrument for large charging power supply system |
| CN107994278B (en) * | 2017-11-13 | 2024-04-09 | 深圳市道通智能航空技术股份有限公司 | Battery equalization device and method and unmanned aerial vehicle |
| CN108649650A (en) * | 2018-06-07 | 2018-10-12 | 程志均 | A kind of lithium battery group charging method to match with passive equalization function |
| CN115021361B (en) * | 2022-06-23 | 2025-03-18 | 上海理工大学 | A ternary lithium-lithium iron phosphate hybrid battery pack balancing method |
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