CN106848464A - A kind of battery balanced estimation algorithm and battery management system - Google Patents
A kind of battery balanced estimation algorithm and battery management system Download PDFInfo
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- CN106848464A CN106848464A CN201611241793.1A CN201611241793A CN106848464A CN 106848464 A CN106848464 A CN 106848464A CN 201611241793 A CN201611241793 A CN 201611241793A CN 106848464 A CN106848464 A CN 106848464A
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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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/21—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having the same nominal voltage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/22—Balancing the charge of battery modules
-
- 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
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
-
- 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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
-
- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- 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
-
- 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
Abstract
The present invention provides a kind of battery balanced estimation algorithm and battery management system, and the battery balanced estimation algorithm is estimated the battery capacity value of cell by battery OCV SOC lists, comprised the following steps：Gather the current cell voltage of each cell and current battery temperature；According to battery OCV SOC lists, the corresponding battery capacity value of the cell voltage of each cell under the current battery temperature is drawn, form present battery capacity value list；The maximum cell of battery capacity value and/or the minimum cell of battery capacity value are obtained in the present battery capacity value list, and equalization operation is carried out to this cell.The present invention can estimate the actual battery capability value of battery, and the battery capacity value of relatively more each cell, so as to select the cell that capability value is higher and/or capability value is relatively low, then this cell is operated in a balanced way, the appearance of equilibrium situation by mistake can be prevented effectively from.
Description
Technical field
The present invention relates to the battery management technique of electric automobile, more particularly to a kind of battery balanced estimation algorithm and battery management
System.
Background technology
In recent years, increasing product uses lithium ion battery as main power source, mainly due to lithium ion battery
With small volume, energy density is high, and memory-less effect, cycle life is high, the low advantage of self-discharge rate；But lithium ion battery simultaneously
It is very high to charge-discharge power demand, when overcharging, cross put, overcurrent and when occurring situations such as short circuit, lithium ion battery pressure is big with heat
Amount increase, easily produce spark, burning even explode, therefore, lithium ion battery bar none all added with cross charge and discharge protecting
Circuit.With the manufacture level and technique of current battery, it is impossible to ensure battery with two side terminals.If these batteries are assembled into one
The voltage differences that module, the capacity individual difference produced in use due to battery and self-discharge rate are produced, can cause mould
The parameter of each battery is far from each other in group.Battery management system (BMS) is just necessarily required to be equipped with equalization function for this problem
To ensure safety and stability.
At present, the balanced estimation algorithm of battery is found out highest one and is saved or minimum typically by the magnitude of voltage size of comparative cell
One saves to be acted in a balanced way, but the shortcoming of this algorithm is：The magnitude of voltage of battery can not be true under to a certain degree
The size of the true capacity of battery is fed back, if only making a decision condition with magnitude of voltage, it is likely that situation in a balanced way occur by mistake.
The content of the invention
It is an object of the invention to propose a kind of battery balanced estimation algorithm and battery management system, to avoid equilibrium situation by mistake
Appearance.
It is that, up to this purpose, the present invention uses following technical scheme：
On the one hand, the present invention provides a kind of battery balanced estimation algorithm, and cell is estimated by battery OCV-SOC lists
Battery capacity value, comprises the following steps：
(1) each cell current cell voltage and current battery temperature are gathered；
(2) according to battery OCV-SOC lists, the electricity of each cell under the current battery temperature is drawn
The corresponding battery capacity value of cell voltage, forms present battery capacity value list；
(3) the maximum cell of battery capacity value is obtained in the present battery capacity value list and/or battery holds
The minimum cell of value, and equalization operation is carried out to the cell.
Further, in step (2), battery OCV-SOC lists be different battery temperatures under, the battery of cell
Voltage and its corresponding battery capacity value.
Further, step (2) specifically includes following steps：
The cell voltage under the current battery temperature is searched in the battery OCV-SOC lists, is judged
Whether there is the current cell voltage in the battery OCV-SOC lists：
If so, exporting the corresponding electricity of the cell voltage of the cell under the current battery temperature
Tankage value, forms present battery capacity value list；
If it is not, calculating the battery capacity value by below equation：
Wherein, sxIt is the battery capacity value, vxIt is the cell voltage under the current battery temperature, v1With
v2It is two cell voltages, s present in the battery OCV-SOC lists under the current battery temperature1It is v1
The corresponding battery capacity value, s under the current battery temperature2It is v2The corresponding institute under the current battery temperature
State battery capacity value, vxPositioned at v1And v2For in the voltage range of node.
Further, in step (2), the current battery temperature is arranged using nearby principle in the battery OCV-SOC
The battery temperature is chosen in table.
Further, in step (3), when the current battery capacity value is consistent, then more current battery electricity
Pressure, obtains the maximum cell of cell voltage and/or the minimum cell of cell voltage, and the cell is carried out
Equalization operation.
On the other hand, the present invention also provides a kind of battery management system, including：
Voltage acquisition module, the cell voltage current for gathering each cell；
Temperature collect module, the battery temperature current for gathering each cell；
Processing module, for the current cell voltage and the current battery temperature according to collection, passes through
OCV-SOC lists, draw the corresponding battery of the cell voltage of each cell under the current battery temperature
Capability value, forms present battery capacity value list, and battery capacity value maximum is obtained in the present battery capacity value list
Cell and/or the minimum cell of battery capacity value；
Control module, for the maximum cell of the battery capacity value that obtains processing module and/or battery capacity value
Minimum cell does equalization operation.
Further, the processing module specifically for：
The cell voltage under the current battery temperature is searched in the battery OCV-SOC lists, is judged
Whether there is the current cell voltage in the battery OCV-SOC lists：
If so, exporting the corresponding electricity of the cell voltage of the cell under the current battery temperature
Tankage value, forms present battery capacity value list.
Further, the processing module is additionally operable to：
If it is not, calculating the battery capacity value by below equation：
Wherein, sxIt is the battery capacity value, vxIt is the cell voltage under the current battery temperature, v1With
v2It is two cell voltages, s present in the battery OCV-SOC lists under the current battery temperature1It is v1
The corresponding battery capacity value, s under the current battery temperature2It is v2The corresponding institute under the current battery temperature
State battery capacity value, vxPositioned at v1And v2For in the voltage range of node.
Further, the processing module is additionally operable to：
According to the current battery temperature of collection, chosen in the battery OCV-SOC lists using nearby principle
The battery temperature.
Further, the processing module is additionally operable to：
When the current battery capacity value is consistent, then the more current cell voltage, obtains cell voltage maximum
Cell and/or the minimum cell of cell voltage.
Beneficial effects of the present invention are：
OCV is the open-circuit voltage (Open Circuit Voltage) of battery, and SOC is the capability value of battery, in certain temperature
Under degree point, the voltage of battery and battery capacity are presented one-to-one relation, and the present invention is used as by OCV-SOC and is judged in a balanced way
Standard；Each cell current cell voltage and battery temperature are gathered, the current true electricity of each cell can be just estimated
Tankage value, then by the battery capacity value of relatively more each battery, finds the cell that capability value is higher or capability value is relatively low
Equilibrium is carried out, then can be prevented effectively from the appearance of equilibrium situation by mistake.
Brief description of the drawings
Fig. 1 is the flow chart of the battery balanced estimation algorithm that the embodiment of the present invention one is provided；
Fig. 2 is the flow chart of the battery balanced estimation algorithm that the embodiment of the present invention two is provided；
Fig. 3 is the structural representation of the battery management system that the embodiment of the present invention three is provided.
Specific embodiment
For make present invention solves the technical problem that, the technical scheme that uses and the technique effect that reaches it is clearer, below
The technical scheme of the embodiment of the present invention will be described in further detail with reference to accompanying drawing, it is clear that described embodiment is only
It is a part of embodiment of the invention, rather than whole embodiments.
Embodiment one
The present embodiment provides a kind of battery balanced estimation algorithm, for estimating the actual battery capability value of cell, and leads to
Cross and compare actual battery capability value, find the cell that capability value is higher or capability value is relatively low, and carry out equilibrium, typically by one
Plant battery management system to perform, the battery management system is realized by software and/or hardware.
The battery balanced estimation algorithm, by the battery capacity value of battery OCV-SOC lists estimation cell, including with
Lower step：
S11, gathers each cell current cell voltage and current battery temperature.
Under battery standing state, by voltage acquisition chip and temperature acquisition chip, each cell is gathered current
Cell voltage and battery temperature；General time of repose is half an hour, and specific time of repose is determined according to battery behavior.
S12, according to battery OCV-SOC lists, draw each cell under the current battery temperature described in
The corresponding battery capacity value of cell voltage, forms present battery capacity value list.
The cell voltage under the current battery temperature is searched in the battery OCV-SOC lists, correspondence
Draw the corresponding battery capacity value of the cell voltage of each cell under the current battery temperature, shape
Into present battery capacity value list.
Further, in other embodiments, after step s 12, also include：
S121, searches the cell voltage under the current battery temperature in the battery OCV-SOC lists,
Judge to whether there is the current cell voltage in the battery OCV-SOC lists：
If so, exporting the corresponding electricity of the cell voltage of the cell under the current battery temperature
Tankage value, forms present battery capacity value list；
If it is not, calculating the battery capacity value by below equation：
Wherein, sxIt is the battery capacity value, vxIt is the cell voltage under the current battery temperature, v1With
v2It is two cell voltages, s present in the battery OCV-SOC lists under the current battery temperature1It is v1
The corresponding battery capacity value, s under the current battery temperature2It is v2The corresponding institute under the current battery temperature
State battery capacity value, vxPositioned at v1And v2For in the voltage range of node.
S13, obtains the maximum cell of battery capacity value in the present battery capacity value list and/or battery holds
The minimum cell of value, and equalization operation is carried out to the cell.
The equalization operation of battery needs to consider the overall performance of the design parameter of battery and battery pack.Can be to battery
The maximum cell of capability value is discharged, or the minimum cell of battery capacity value is charged, or by electricity
Measure and be transferred on the minimum cell of battery capacity value from the maximum cell of battery capacity value.
S131, when the current battery capacity value is consistent, then the more current cell voltage, obtains cell voltage
Maximum cell and/or the minimum cell of cell voltage, and equalization operation is carried out to the cell.
Preferably, battery OCV-SOC lists be different battery temperatures under, the cell voltage and its correspondence of cell
Battery capacity value.
Preferably, the current battery temperature chooses described using nearby principle in the battery OCV-SOC lists
Battery temperature.
OCV is the open-circuit voltage (Open Circuit Voltage) of battery, and SOC is the capability value of battery, in certain temperature
Under degree point, the voltage of battery and battery capacity are presented one-to-one relation, and the present embodiment is used as by OCV-SOC and is sentenced in a balanced way
Disconnected standard；Under static condition, each cell current cell voltage and battery temperature are gathered, can just estimate each monomer electricity
The current actual battery capability value in pond, then by the battery capacity value of relatively each battery, finds that capability value is higher or capability value
Relatively low cell, and equilibrium is carried out to this battery under charge or discharge state, then can be prevented effectively from equilibrium situation by mistake
Appearance.
Embodiment two
The present embodiment provides a kind of battery balanced estimation algorithm, on the basis of above-described embodiment, to battery balanced estimation algorithm
It is illustrated.
The ternary battery OCV-SOC lists that table 1 is provided for battery business men, it is listed under different temperature points, different electricity
The corresponding relation of tankage (SOC) and battery open circuit voltage values (OCV).
Table 1
The present invention passes through the cell voltage (i.e. open-circuit voltage values (OCV)) and battery temperature of each cell for collecting
Degree, the actual battery capability value (SOC) of cell can be found out according to table 1, then take the battery capacity value of multiple batteries
(SOC) be compared, finding the batteries that battery capacity value is higher or battery capacity value is relatively low carries out equilibrium, concrete operations
It is as follows：
S21, gathers the cell voltage and battery temperature of cell, determines the temperature spot that battery is used in list.Due to
In table 1, -10 DEG C, 0 DEG C, 15 DEG C, 25 DEG C, 30 DEG C, 45 DEG C, 55 DEG C of this 7 temperature spots are only listed, so we are using nearby
Principle takes temperature spot.If battery temperature uses a row of -10 degree in list less than -10 degree；If battery temperature is in -10 degree to 0
Between degree, then 5 degree of the median that -10 degree are to 0 degree is calculated, if battery temperature is less than the row that 5 degree of median, use -10 are spent,
Otherwise use 0 degree of a row；If battery temperature is more than 55 degree, 55 degree of a row are used.
S22, according to the cell voltage and battery temperature that are gathered in step S21, calculates battery capacity value.It is electric due in table 1
Just one cell voltage of correspondence of tankage value every 5%, so needing according to the cell voltage that actually obtains, finds correspondence battery and holds
Value (is accurate to 1%), comprises the following steps：
If cell voltage is 4.1500V, list temperature in use is 25 degree, then battery capacity value value is 95%~100%
Between scope.
S221, calculates between 4.1143V (95% corresponding cell voltage) and 4.1799V (100% corresponding cell voltage)
Difference a, difference a are 656 (amplifying the numerical value after 10000 times).
S222, calculates the difference between 4.1143V (95% corresponding cell voltage) and 4.1500V (cell voltage of collection)
B, difference b are 357 (amplifying the numerical value after 10000 times).
S223,5 parts are split into by difference a, 656/5=131.2, i.e., every 1 percent account for 131 share.
S224, by difference b divided by share in step S223, obtains capability value difference, i.e. 357/131=2.7, to the capacity
Value difference volume carries out rounding operation, then the battery capacity value is 95+2=97.(being accurate to 1%).
S23, is after every section cell has calculated battery capacity value, battery capacity value to be calculated most by Bubble Sort Algorithm
Big battery and/or the minimum cell of battery capacity value, if battery capacity value is consistent, further do ratio with cell voltage
Compared with, the cell of maximum voltage and/or minimum voltage is found out, finally the cell selected is operated in a balanced way.
The present embodiment can accurately find the true capacity (SOC) of battery, be compared with the true capacity (SOC) of battery,
So as to select the batteries that capacity is higher or capacity is relatively low, then operated in a balanced way, balanced feelings by mistake can be prevented effectively from
The appearance of condition.
Embodiment three
The present embodiment provides a kind of battery management system, for performing the battery balanced estimation algorithm described in above-described embodiment,
Identical technical problem is solved, identical technique effect is reached.
The battery management system includes：Voltage acquisition module 1, temperature collect module 2, processing module 3 and control module
4。
Voltage acquisition module 1, for gathering the current cell voltage of each cell under battery standing state.
Temperature collect module 2, the battery temperature current for gathering each cell.
Processing module 3, for the current cell voltage and the current battery temperature according to collection, passes through
OCV-SOC lists, draw the corresponding battery of the cell voltage of each cell under the current battery temperature
Capability value, forms present battery capacity value list, and battery capacity value maximum is obtained in the present battery capacity value list
Cell and/or the minimum cell of battery capacity value.
Control module 4, for the maximum cell of the battery capacity value that obtains processing module 3 and/or battery capacity
The minimum cell of value does equalization operation.
Wherein, the processing module 3 specifically for：
The cell voltage under the current battery temperature is searched in the battery OCV-SOC lists, is judged
Whether there is the current cell voltage in the battery OCV-SOC lists：
If so, exporting the corresponding electricity of the cell voltage of the cell under the current battery temperature
Tankage value, forms present battery capacity value list.
If it is not, calculating the battery capacity value by below equation：
Wherein, sxIt is the battery capacity value, vxIt is the cell voltage under the current battery temperature, v1With
v2It is two cell voltages, s present in the battery OCV-SOC lists under the current battery temperature1It is v1
The corresponding battery capacity value, s under the current battery temperature2It is v2The corresponding institute under the current battery temperature
State battery capacity value, vxPositioned at v1And v2For in the voltage range of node.
Further, in other embodiments, the processing module 3 is additionally operable to：
According to the current battery temperature of collection, chosen in the battery OCV-SOC lists using nearby principle
The battery temperature.
Further, in other embodiments, the processing module 3 is additionally operable to：
When the current battery capacity value is consistent, then the more current cell voltage, obtains cell voltage maximum
Cell and/or the minimum cell of cell voltage.
The present embodiment is used as criterion in a balanced way by OCV-SOC；Under battery standing state, each cell is gathered
Current cell voltage and battery temperature, can just estimate the current actual battery capability value of each cell, then by than
The battery capacity value of more each battery, finding the cell that capability value is higher or capability value is relatively low carries out equilibrium, then can effectively keep away
Exempt from the appearance of equilibrium situation by mistake.
Know-why of the invention is described above in association with specific embodiment.These descriptions are intended merely to explain of the invention
Principle, and can not by any way be construed to limiting the scope of the invention.Based on explanation herein, the technology of this area
Personnel associate other specific embodiments of the invention by would not require any inventive effort, these modes fall within
Within protection scope of the present invention.
Claims (10)
1. a kind of battery balanced estimation algorithm, the battery capacity value of cell is estimated by battery OCV-SOC lists, and its feature exists
In comprising the following steps：
(1) each cell current cell voltage and current battery temperature are gathered；
(2) according to battery OCV-SOC lists, battery electricity of each cell under the current battery temperature is drawn
The corresponding battery capacity value is pressed, present battery capacity value list is formed；
(3) the maximum cell of battery capacity value and/or battery capacity value are obtained in the present battery capacity value list
Minimum cell, and equalization operation is carried out to the cell.
2. battery balanced estimation algorithm according to claim 1, it is characterised in that in step (2), the battery OCV-SOC
Under list is different battery temperatures, the cell voltage of cell and its corresponding battery capacity value.
3. battery balanced estimation algorithm according to claim 2, it is characterised in that step (2) specifically includes following steps：
The cell voltage under the current battery temperature is searched in the battery OCV-SOC lists, judges described
Whether there is the current cell voltage in battery OCV-SOC lists：
If so, export the corresponding battery of the cell voltage of the cell under the current battery temperature holding
Value, forms present battery capacity value list；
If it is not, calculating the battery capacity value by below equation：
Wherein, sxIt is the battery capacity value, vxIt is the cell voltage under the current battery temperature, v1And v2Be
Two cell voltages, s present in the battery OCV-SOC lists under the current battery temperature1It is v1Current
The corresponding battery capacity value, s under the battery temperature2It is v2The corresponding battery under the current battery temperature
Capability value, vxPositioned at v1And v2For in the voltage range of node.
4. battery balanced estimation algorithm according to claim 1, it is characterised in that in step (2), the current battery temperature
Degree chooses the battery temperature using nearby principle in the battery OCV-SOC lists.
5. battery balanced estimation algorithm according to claim 1, it is characterised in that in step (3), the current battery holds
When value is consistent, then the more current cell voltage, obtains the maximum cell of cell voltage and/or cell voltage most
Small cell, and equalization operation is carried out to the cell.
6. a kind of battery management system, it is characterised in that including：
Voltage acquisition module, the cell voltage current for gathering each cell；
Temperature collect module, the battery temperature current for gathering each cell；
Processing module, for the current cell voltage and the current battery temperature according to collection, by OCV-SOC
List, draws the corresponding battery capacity value of the cell voltage of each cell under the current battery temperature,
Present battery capacity value list is formed, the maximum cell of battery capacity value is obtained in the present battery capacity value list
And/or the minimum cell of battery capacity value；
Control module, it is minimum for the maximum cell of the battery capacity value that obtains processing module and/or battery capacity value
Cell do equalization operation.
7. battery management system according to claim 6, it is characterised in that the processing module specifically for：
The cell voltage under the current battery temperature is searched in the battery OCV-SOC lists, judges described
Whether there is the current cell voltage in battery OCV-SOC lists：
If so, export the corresponding battery of the cell voltage of the cell under the current battery temperature holding
Value, forms present battery capacity value list.
8. battery management system according to claim 7, it is characterised in that the processing module is additionally operable to：
If it is not, calculating the battery capacity value by below equation：
Wherein, sxIt is the battery capacity value, vxIt is the cell voltage under the current battery temperature, v1And v2Be
Two cell voltages, s present in the battery OCV-SOC lists under the current battery temperature1It is v1Current
The corresponding battery capacity value, s under the battery temperature2It is v2The corresponding battery under the current battery temperature
Capability value, vxPositioned at v1And v2For in the voltage range of node.
9. battery management system according to claim 6, it is characterised in that the processing module is additionally operable to：
According to the current battery temperature of collection, choose described in the battery OCV-SOC lists using nearby principle
Battery temperature.
10. battery management system according to claim 6, it is characterised in that the processing module is additionally operable to：
When the current battery capacity value is consistent, then the more current cell voltage, obtains the maximum list of cell voltage
Body battery and/or the minimum cell of cell voltage.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233464A (en) * | 2017-12-08 | 2018-06-29 | 简式国际汽车设计（北京）有限公司 | A kind of battery pack active equalization method and system |
| CN108944509A (en) * | 2018-07-05 | 2018-12-07 | 宁波均胜科技有限公司 | A kind of batteries of electric automobile state-of-charge balanced management method |
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| CN109435775A (en) * | 2017-08-31 | 2019-03-08 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN110015181A (en) * | 2017-08-24 | 2019-07-16 | 宝沃汽车（中国）有限公司 | Battery equalization method, device and vehicle |
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| CN110015181A (en) * | 2017-08-24 | 2019-07-16 | 宝沃汽车（中国）有限公司 | Battery equalization method, device and vehicle |
| CN110015181B (en) * | 2017-08-24 | 2021-01-12 | 宝沃汽车（中国）有限公司 | Battery equalization method and device and vehicle |
| CN109435775B (en) * | 2017-08-31 | 2020-08-25 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic device |
| WO2019042353A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery equalization system, vehicle, battery equalization method, and storage medium |
| CN109435775A (en) * | 2017-08-31 | 2019-03-08 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN108233464B (en) * | 2017-12-08 | 2020-02-21 | 简式国际汽车设计（北京）有限公司 | Active equalization method and system for battery pack |
| CN108233464A (en) * | 2017-12-08 | 2018-06-29 | 简式国际汽车设计（北京）有限公司 | A kind of battery pack active equalization method and system |
| CN108944509A (en) * | 2018-07-05 | 2018-12-07 | 宁波均胜科技有限公司 | A kind of batteries of electric automobile state-of-charge balanced management method |
| CN109342963A (en) * | 2018-09-28 | 2019-02-15 | 中航锂电技术研究院有限公司 | A kind of micro- mixed 48V system BMS system and control method |
| CN111064261A (en) * | 2020-01-02 | 2020-04-24 | 安徽锐能科技有限公司 | Passive equalization strategy, device and storage medium considering temperature and SOH |
| CN111098758A (en) * | 2020-01-02 | 2020-05-05 | 安徽锐能科技有限公司 | Equalization method, circuit and storage medium based on SOH |
| CN111211594A (en) * | 2020-01-02 | 2020-05-29 | 安徽锐能科技有限公司 | Power supply type balance control method, circuit and storage medium considering temperature and SOH |
| CN111064261B (en) * | 2020-01-02 | 2024-01-12 | 安徽锐能科技有限公司 | Passive equalization strategy, device and storage medium considering temperature and SOH |
| CN111211594B (en) * | 2020-01-02 | 2024-03-15 | 安徽锐能科技有限公司 | Complementary equalization control method, circuit and storage medium considering temperature and SOH |
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