CN109450027A - Lithium ion battery equalization methods - Google Patents
Lithium ion battery equalization methods Download PDFInfo
- Publication number
- CN109450027A CN109450027A CN201811408563.9A CN201811408563A CN109450027A CN 109450027 A CN109450027 A CN 109450027A CN 201811408563 A CN201811408563 A CN 201811408563A CN 109450027 A CN109450027 A CN 109450027A
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- Prior art keywords
- voltage
- battery cell
- battery
- discharge
- lithium ion
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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
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. 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 kind of lithium ion battery equalization methods, comprising steps of whether detection equalizer switch is opened；If so, whether the difference of detection battery cell maximum voltage and battery cell minimum voltage is greater than the first setting voltage, and whether the battery cell minimum voltage is greater than the second setting voltage；If so, whether the difference of the voltage and the battery cell minimum voltage that detect each battery cell respectively is greater than the first setting voltage；If so, battery cell carries out balance charge/discharge.Lithium ion battery equalization methods provided by the invention, realize the judgement whether needed to each battery cell into balance charge/discharge, it avoids and charge and discharge only is carried out to the battery cell of some overtension, also solve the problems, such as that portion voltage is unable to complete equilibrium lower than the battery cell of average voltage；In addition, also avoiding occurring heat unbalance problem when more battery cell is balanced simultaneously.
Description
Technical field
The present invention relates to automobile power cell technical field more particularly to a kind of lithium ion battery equalization methods.
Background technique
With flourishing for automobile industry, new-energy automobile is more and more popular with consumers.And battery management system is
Guarantee the essential component part of battery balanced and stable power output.
Li-ion batteries piles in battery management system provide electricity needs using the concatenated mode of multiple battery cells,
Sometime, the capacity of each battery cell and remaining capacity may be inconsistent in battery pack, mainly by two aspect reasons
Cause: be on the one hand it is inconsistent caused by battery cell manufacturing process, make battery capacity generate different；Another party
Face be battery pack at work, due to the thermo parameters method of each battery cell, the speed of chemical reaction, polarization resistance/internal resistance
Height it is different, so that the charge of each monomer charge and discharge in battery pack is generated difference, it is inconsistent to eventually lead to monomer remaining capacity.
Under the premise of battery management system protection mechanism is added, in discharge process, battery pack is least in available power
Battery cell enters electric discharge off state after being discharged；Equally during the charging process, the battery pack electricity most in available power
Charge cutoff state is entered after pond monomer is fully charged.
With battery balanced measure, can effectively making battery, depth of discharge keeps preferable consistent during the work time
Property, it can be improved the whole cycle life of battery pack, while making each battery cell Uniform attenuation in whole life cycle.
It is existing to realize there are mainly two types of battery balanced schemes:
The first is maximum value process, i.e. each monomer voltage in battery management system detection battery pack, works as Vmax-Vmin> Vα
When, the highest monomer of voltage opens equalization channel and discharges, until Vmax-Vmin≤VαUntil.
Wherein, VmaxFor maximum monomer voltage, VminFor minimum monomer voltage, VαFor the voltage of certain setting.
Second is mean value method, i.e. each monomer voltage in battery management system detection battery pack, works as Vmax-Vmin> Vα
When, compare the average voltage V of all monomers in the voltage and battery pack of certain monomerer, V is higher than to monomer voltageerMonomer open
It opens equalization channel to discharge, until Vmax-Vmin≤VαUntil.
Wherein VmaxFor maximum monomer voltage, VminFor minimum monomer voltage, VerFor the average value of each monomer voltage.
But for the first above-mentioned scheme, balance policy is primarily adapted for use in most battery cell voltages
The situation that difference is small, Individual cells monomer voltage is too high or too low, in addition, can only some monomer highest to wherein voltage into
Row electric discharge, equalization efficiency are low.
For above-mentioned second scheme, after balance policy is finished, still some voltage is lower than average electricity
Press VerBattery cell be unable to complete equilibrium.
Summary of the invention
The object of the present invention is to provide a kind of lithium ion battery equalization methods, to solve above-mentioned the problems of the prior art,
It realizes and equilibrium is carried out to each battery cell.
The present invention provides a kind of lithium ion battery equalization methods, wherein includes the following steps:
Whether detection equalizer switch is opened；
If so, detecting all battery cells, and judge wherein battery cell maximum voltage and battery cell minimum voltage
Difference whether be greater than the first setting voltage, and whether the battery cell minimum voltage is greater than the second setting voltage；
If so, whether the difference for detecting the voltage and the battery cell minimum voltage of each battery cell respectively is big
In the first setting voltage；
If so, carrying out balance charge/discharge to the battery cell.
Lithium ion battery equalization methods as described above, wherein preferably, carry out balance charge/discharge in battery cell
Later, the method also includes:
The voltage of each battery cell for carrying out balance charge/discharge and the difference of the battery cell minimum voltage are detected respectively
Whether whether value be less than the voltage of third setting voltage or each battery cell for carrying out balance charge/discharge less than the
Whether four setting voltages or the equalizer switch close；
If so, the battery cell for carrying out balance charge/discharge exits balance charge/discharge；
If not, charge and discharge of keeping in balance.
Lithium ion battery equalization methods as described above, wherein preferably, whether the detection equalizer switch is opened
Before, the method also includes:
Whether the dormancy time of detection battery management system is greater than preset duration；
If so, whether detection equalizer switch is opened.
Lithium ion battery equalization methods as described above, wherein preferably, the preset duration is 4h.
Lithium ion battery equalization methods as described above, wherein preferably, if detection battery cell maximum voltage
Whether it is greater than the first setting voltage with the difference of battery cell minimum voltage, and whether the battery cell minimum voltage is greater than
Second set voltage result be it is no, the method also includes:
Into preset first standby time；
After first standby time, repeat to detect battery cell maximum voltage and battery cell minimum voltage
Whether difference is greater than the first setting voltage, and whether the battery cell minimum voltage is greater than the second setting voltage.
Lithium ion battery equalization methods as described above, wherein preferably, first standby time is 50ms.
Lithium ion battery equalization methods as described above, wherein preferably, detect the electricity of each battery cell respectively
Whether pressure and the difference of the battery cell minimum voltage are greater than the first setting voltage, and the minimum electricity of the battery cell
Pressure whether be greater than second set voltage result be it is no, the method also includes:
Into preset second standby time；
After second standby time, repetition detects the voltage and battery cell minimum of each battery cell
Whether the difference of voltage is greater than the first setting voltage, and whether the battery cell minimum voltage is greater than the second setting electricity
Pressure.
Lithium ion battery equalization methods as described above, wherein preferably, second standby time is 50ms.
Whether lithium ion battery equalization methods provided by the invention realize and need to enter to each battery cell
The judgement of weighing apparatus charge and discharge, avoids and only carries out charge and discharge to the battery cell of some overtension, it is low also to solve portion voltage
Balanced problem is unable to complete in the battery cell of average voltage；In addition, also avoiding going out when more battery cell is balanced simultaneously
The problem that existing heat is unbalance.
Specific embodiment
The embodiment of the present invention is described below in detail, in which the same or similar labels are throughly indicated identical or classes
As element or element with the same or similar functions.The following examples are exemplary, for explaining only the invention,
And it is not construed as limiting the claims.
The embodiment of the invention provides a kind of lithium ion battery equalization methods, by taking 48V lithium ion battery as an example comprising
Following steps:
Step S1, whether detection equalizer switch is opened；If so, entering step S2.
In general, it is connected with equalizer switch in the link circuit of battery modules, and when the equalizer switch is opened, battery mould
Battery cell in group can carry out charge or discharge.
Step S2, whether the difference of detection battery cell maximum voltage and battery cell minimum voltage is greater than the first setting
Voltage, and whether battery cell minimum voltage is greater than the second setting voltage；If so, entering step S3.
In step S2, needs to detect the voltage of all battery cells, obtain maximum voltage and minimum voltage.With ten
For a battery cell, if the voltage that the first battery cell has is minimum voltage, the voltage that the tenth battery cell has is
The voltage of tenth battery cell is then subtracted the difference and the first setting voltage of the voltage of the first battery cell by maximum voltage
It compares, while judging whether the voltage of the first battery cell is greater than the second setting voltage, in this, as above-mentioned Rule of judgment.
Step S3, whether the difference of the voltage and battery cell minimum voltage that detect each battery cell respectively is greater than
One setting voltage, and whether battery cell minimum voltage is greater than the second setting voltage；If so, entering step S4.
Specifically, for step S3, in one embodiment, Li-ion batteries piles include the first battery cell to the
Ten battery cells, totally ten battery cells, wherein the voltage value of the first battery cell is the minimum value in ten battery cells,
If the voltage value of the second battery cell to the 6th battery cell is greater than the first setting with the voltage difference of the first battery cell
Voltage, then, this five battery cells of the second battery cell to the 6th battery cell carry out balance charge/discharge；And other
If it is big with the voltage difference of the first battery cell that this four battery cells of seven battery cells to the tenth battery cell are not able to satisfy it
Voltage is set in first, then, this four battery cells of the 7th battery cell to the tenth battery cell not can be carried out balanced charge and discharge
Electricity；And if the voltage value of the first battery cell is no more than the second setting voltage, the first battery cell to the tenth battery list
This ten battery cells of body not can be carried out balance charge/discharge.
Step S4, equalizaing charge or electric discharge are carried out to battery cell.In terms of existing technologies, the embodiment of the present invention
The lithium ion battery equalization methods of offer realize the judgement for whether needing to enter balance charge/discharge to each battery cell,
It avoids and charge and discharge only is carried out to the battery cell of some overtension, also solve the electricity that portion voltage is lower than average voltage
Pond monomer is unable to complete balanced problem；Appearance heat is unbalance when in addition, also avoiding the equilibrium simultaneously of more battery cell asks
Topic.
Further, after step s4, the method also includes:
Step S5, the voltage and battery cell minimum voltage of each battery cell for carrying out balance charge/discharge are detected respectively
Difference whether be less than the voltage of third setting voltage or each battery cell for carrying out balance charge/discharge less than the
Whether four setting voltages or equalizer switch close；If so, entering step S6；If not, entering step S7.
Step S6, the described battery cell for carrying out balance charge/discharge exits balance charge/discharge.
Step S7, it keeps in balance charge and discharge.
Further, before step S1, the method also includes:
Step S0, whether the dormancy time for detecting battery management system is greater than preset duration；If so, entering step S1.
In dormancy time, system detects and judges without equilibrium condition, so as to energy saving, while can also extend battery
Service life.Wherein, preset duration can be 4h.
Further, if the result of step S2 be it is no, the method also includes:
Step S21, into preset first standby time.
Step S22, it after first standby time, repeats to detect battery cell maximum voltage and battery cell most
Whether the difference of small voltage is greater than the first setting voltage, and whether the battery cell minimum voltage is greater than the second setting voltage.
Wherein, the first standby time can be 50ms.
By the way that the first standby time is arranged, the intermittent detection of system may be implemented, so as to reduce system operation frequency
It is secondary, it is energy saving.
Certainly, if the result of step S3 be it is no, the method can also include:
Step S31, into preset second standby time.
Step S32, after the second standby time, repetition detects the voltage and battery cell minimum of each battery cell
Whether the difference of voltage is greater than the first setting voltage, and whether battery cell minimum voltage is greater than the second setting voltage.Wherein,
Second standby time may be 50ms.
Lithium ion battery equalization methods provided in an embodiment of the present invention are realized to whether each battery cell needs
Into the judgement of balance charge/discharge, avoids and charge and discharge only are carried out to the battery cell of some overtension, also solve part
Voltage is unable to complete balanced problem lower than the battery cell of average voltage；In addition, it is equal simultaneously to also avoid more battery cell
Occurs heat unbalance problem when weighing apparatus.
Structure, feature and effect of the invention are described in detail in embodiments shown above, and the foregoing is merely this
The preferred embodiment of invention, it is all to change according to made by conception of the invention, or it is revised as the equivalence enforcement of equivalent variations
Example should all be within the scope of the present invention when the spirit still covered without departing from specification.
Claims (8)
1. a kind of lithium ion battery equalization methods, which comprises the steps of:
Whether detection equalizer switch is opened；
If so, detecting all battery cells, and judge the difference of wherein battery cell maximum voltage and battery cell minimum voltage
Whether value is greater than the first setting voltage, and whether the battery cell minimum voltage is greater than the second setting voltage；
If so, the difference of the voltage and the battery cell minimum voltage that detect each battery cell respectively whether be greater than it is described
First setting voltage；
If so, carrying out balance charge/discharge to the battery cell.
2. lithium ion battery equalization methods according to claim 1, which is characterized in that carry out balanced charge and discharge in battery cell
After electricity, the method also includes:
The difference of voltage and the battery cell minimum voltage for detecting each battery cell for carrying out balance charge/discharge respectively is
It is no whether to set the voltage of voltage or each battery cell for carrying out balance charge/discharge less than the 4th setting less than third
Whether voltage or the equalizer switch close；
If so, the battery cell for carrying out balance charge/discharge exits balance charge/discharge；
If not, charge and discharge of keeping in balance.
3. lithium ion battery equalization methods according to claim 1, which is characterized in that whether the detection equalizer switch is opened
Before opening, the method also includes:
Whether the dormancy time of detection battery management system is greater than preset duration；
If so, whether detection equalizer switch is opened.
4. lithium ion battery equalization methods according to claim 3, which is characterized in that the preset duration is 4h.
5. lithium ion battery equalization methods according to claim 1, which is characterized in that if the maximum electricity of detection battery cell
Whether pressure and the difference of battery cell minimum voltage are greater than the first setting voltage, and whether the battery cell minimum voltage is greater than
Second set voltage result be it is no, the method also includes:
Into preset first standby time；
After first standby time, repeats to detect battery cell maximum voltage and the difference of battery cell minimum voltage is
It is no to be greater than the first setting voltage, and whether the battery cell minimum voltage is greater than the second setting voltage.
6. lithium ion battery equalization methods according to claim 5, which is characterized in that first standby time is
50ms。
7. lithium ion battery equalization methods according to claim 1, which is characterized in that detect each battery cell respectively
Whether the difference of voltage and the battery cell minimum voltage is greater than the first setting voltage, and the minimum electricity of the battery cell
Pressure whether be greater than second set voltage result be it is no, the method also includes:
Into preset second standby time；
After second standby time, repetition detects the voltage and the battery cell minimum voltage of each battery cell
Whether difference is greater than the first setting voltage, and whether the battery cell minimum voltage is greater than the second setting voltage.
8. lithium ion battery equalization methods according to claim 7, which is characterized in that second standby time is
50ms。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811408563.9A CN109450027A (en) | 2018-11-23 | 2018-11-23 | Lithium ion battery equalization methods |
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| CN201811408563.9A CN109450027A (en) | 2018-11-23 | 2018-11-23 | Lithium ion battery equalization methods |
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Cited By (4)
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| CN110395142A (en) * | 2019-07-16 | 2019-11-01 | 奇瑞新能源汽车股份有限公司 | A kind of battery balanced control method of Adaptive Fuzzy Neural-network and its control system |
| CN111942220A (en) * | 2020-08-06 | 2020-11-17 | 广州小鹏汽车科技有限公司 | Battery voltage distribution early warning method and device and vehicle |
| CN113794258A (en) * | 2021-09-18 | 2021-12-14 | 江苏金派克新能源有限公司 | Whole-process equalization method for lithium battery pack |
| CN113829957A (en) * | 2021-09-29 | 2021-12-24 | 力高(山东)新能源技术有限公司 | Battery equalization evaluation method for charging new energy battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110395142A (en) * | 2019-07-16 | 2019-11-01 | 奇瑞新能源汽车股份有限公司 | A kind of battery balanced control method of Adaptive Fuzzy Neural-network and its control system |
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| CN113794258A (en) * | 2021-09-18 | 2021-12-14 | 江苏金派克新能源有限公司 | Whole-process equalization method for lithium battery pack |
| CN113829957A (en) * | 2021-09-29 | 2021-12-24 | 力高(山东)新能源技术有限公司 | Battery equalization evaluation method for charging new energy battery |
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Address after: 230601 No. 99 Ziyun Road, Hefei Economic and Technological Development Zone, Anhui Province Applicant after: Anhui Jianghuai Automobile Group Limited by Share Ltd Address before: 230601 No. 669 Shixin Road, Taohua Industrial Park, Hefei City, Anhui Province Applicant before: Anhui Jianghuai Automobile Group Limited by Share Ltd |
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