CN108347073A - Charge balancing control method for power lithium ion accumulator group - Google Patents
Charge balancing control method for power lithium ion accumulator group Download PDFInfo
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- CN108347073A CN108347073A CN201810109394.2A CN201810109394A CN108347073A CN 108347073 A CN108347073 A CN 108347073A CN 201810109394 A CN201810109394 A CN 201810109394A CN 108347073 A CN108347073 A CN 108347073A
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- Prior art keywords
- charging
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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
-
- 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
-
- 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
-
- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses the charge balancing control method for power lithium ion accumulator group, charge balancing control method includes the following steps：A, BMS and charger are designed with 2.0 communication interfaces of Open CAN, and are connected with each other to control charging current；When B, charging, the BMS circuits in battery pack detect each monomer voltage；C, when there is no monomer voltage to be more than 3.6V, according to normal charging current（10A）Charging.The present invention is charged under the monitoring control of BMS whole process by the mutually coordinated control of communication bus by equal balance system and charger, and by the current curve differentiation of the constant-voltage charge part in traditional CC/CV charging modes, constant-voltage charge is replaced with Multi-section constant current voltage limiting mode, not only the unconspicuous disadvantage of low current portfolio effect under the charging of traditional CC/CV patterns had been overcome, but also has solved simple multistage constant current charging method and cannot be guaranteed that all single batteries can be full of（Especially when differing greatly between monomer）And the drawback that the charging time is long.
Description
Technical field
The present invention relates to battery technology fields, are controlled particularly for the charge balancing of power lithium ion accumulator group
Method.
Background technology
With the rise of electric vehicle, lithium-ion-power cell is also towards enlargement, complication development, in particular for very
The pure electric automobile of big power, the capacity of ampere-hours up to a hundred, up to a hundred volts of voltages need connect to adapt to the above demand easily
Many batteries need in some battery packs thousands of batteries, series connection series at least to need 60 or more to can be only achieved comparatively ideal electricity
Engine efficiency and dynamic characteristics.To ensure cell safety operation, need that batteries management system is installed（Abbreviation BMS）To monitor in real time
The state of every battery, but BMS can only play the role of monitoring, and maintenance conditioning cannot be carried out to battery pack, it is a large amount of to put into practice
As a result it proves that battery is electrically charged and fills bad, the life of many battery pack Frequent Accidents is under battery pack charging status.
The most common charging modes of tradition are to carry out CC/CV chargings, for single battery, constant-current constant-voltage charging to battery
It can ensure that battery is full of and does not overcharge in the shortest time, but for battery pack, it is faint between battery cell
Difference make battery pack generate greatly voltage differences during constant-voltage charge, especially when serial number is larger, it is single only
The voltage value of battery is covered under terminal voltage, and charger can not detect at all, and electrical phenomena is overcharged to be easy to happen.In order to
Single over-charging of battery, people is prevented to be detected to monomer voltage by electronic equipment, when a certain monomer voltage reaches setting value
When, then it cuts off electric current and is protected, although this mode can not be overcharged with effective protection battery, when battery differs greatly
When, certain cell voltage reaches setting value, and the still underfill of other batteries, such mode influence battery capacity utilization rate and longevity
Life, detection isolated traditional BMS monitor battery pack, and charge circuit can directly be disconnected, stop charging by encountering such case, but its meeting
Cause battery pack that cannot be full of, so BMS and charger are in communication with each other, phase mutual feedback, real intelligent charging has become
The direction of the charging development of the following large-sized battery pack.
Multistage constant-current charge control method was proposed in patent CN101459343A, is embodied as constant current and is filled
Electricity turns down electric current when any monomer reaches assigned voltage, when any monomer reaches assigned voltage under smaller current,
Electric current is turned down again, and so on, so that charging current is infinitely reduced until scheduled carrying current value.Such mode with it is traditional
Constant current constant voltage formula charging method is compared, it is advantageous that the electricity being charged into can be more, but cannot be guaranteed each battery
Can be fully charged, therefore such mode does not have portfolio effect.The reason is as follows that：When the more other monomers of some monomer voltage in battery pack
It is higher and when differing greatly, as long as series connection constant-current charge, if being not added with any balanced measure, when no matter how electric current reduces,
Reach assigned voltage at first every time is the monomer for reaching assigned voltage at first for the first time always, such as 12 monomer series-connected composition electricity
Pond group carries out constant-current charge with 3A, it is assumed that reach assigned voltage at first under this electric current is No. 1 monomer, but electric current is down to
40mA, reach assigned voltage at first under this electric current is still No. 1 monomer, when electric current is down to 1A, still in this way, under so
It goes, can be completely filled with electricity is only No. 1 monomer, and other batteries are still that assigned voltage is not achieved, therefore are to be not fully filled electricity
, and charging current is smaller, and the capacity that battery is filled in the unit interval is fewer, therefore when electric current is too small, and the charging time will
It is very long.
Invention content
The purpose of the present invention is to provide the charge balancing control methods for power lithium ion accumulator group, to solve
The problems mentioned above in the background art.
To achieve the above object, the present invention provides the following technical solutions：Charging for power lithium ion accumulator group
Balance control method, charge balancing control method include the following steps：
A, BMS and charger are designed with 2.0 communication interfaces of Open CAN, and are connected with each other to control charging current；
When B, charging, the BMS circuits in battery pack detect each monomer voltage；
C, when there is no monomer voltage to be more than 3.6V, according to normal charging current（10A）Charging；
D, when detecting that any one monomer voltage is more than 3.6V, BMS is communicated by communication interface and charger, charger
Charging current is controlled, charging current is reduced into 5A；
E, it charges after a period of time, battery cell voltage is begun to ramp up again, and repeats step D；
F, when any one monomer reaches specified value, BMS controls charger and reduces current value again；
G, reduce by 10 grades of electric current, ultimate current is reduced to 40mA；
H, equal balance system is opened, and charging current is made no longer to reduce；
I, under the action of euqalizing current, the monomer actual charge current for reaching predetermined voltage is almost 0, and not up to predetermined electricity
Its charging current of the monomer of pressure is then 40mA；
J, through charging after a period of time, all monomer battery voltages can reach predetermined voltage；
K, after detecting that all 16 cell voltages all reach 3.6V；
L, BMS sends out signal control charger and stops charging.
Preferably, it charges to battery pack and is used cooperatively with to the balanced of battery pack, equal balance system can be and battery pack collection
At also can be integrated with charging system, or to be used alone, balanced way can be that passive type fever is balanced or active point
Stream or current compensation are balanced.
Preferably, charging modes are multistage constant-current charge, and the electric current of afterbody constant-current charge should be not higher than equilibrium
1~5 times of electric current.
Preferably, in multistage charging process, according to the limitation voltage of every grade of setting, the single battery in battery pack has can
Balanced cut-in voltage can repeatedly be reached, but balance system is only just opened when charging current is not higher than 1~5 times of euqalizing current,
And when every battery reaches setting voltage after the unlatching of equal balance system, turn off charger.
Compared with prior art, beneficial effects of the present invention are as follows：
The present invention is filled under the monitoring control of BMS whole process by the mutually coordinated control of communication bus by equal balance system and charger
Electricity, and by the current curve differentiation of the constant-voltage charge part in traditional CC/CV charging modes, with Multi-section constant current voltage limiting mode
Instead of constant-voltage charge, the unconspicuous disadvantage of low current portfolio effect under the charging of traditional CC/CV patterns was not only overcome, but also solve
Simple multistage constant current charging method cannot be guaranteed that all single batteries can be full of（Especially when differing greatly between monomer
When）And the drawback that the charging time is long.
Description of the drawings
Fig. 1 is present system principle schematic.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the charge balancing control method for power lithium ion accumulator group, charge balancing controlling party
Method includes the following steps：
A, BMS and charger are designed with 2.0 communication interfaces of Open CAN, and are connected with each other to control charging current；
When B, charging, the BMS circuits in battery pack detect each monomer voltage；
C, when there is no monomer voltage to be more than 3.6V, according to normal charging current（10A）Charging；
D, when detecting that any one monomer voltage is more than 3.6V, BMS is communicated by communication interface charger, charger control
Charging current is reduced 5A by charging current processed；
E, it charges after a period of time, battery cell voltage is begun to ramp up again, and repeats step D；
F, when any one monomer reaches specified value, BMS controls charger and reduces current value again；
G, reduce by 10 grades of electric current, ultimate current is reduced to 40mA；
H, equal balance system is opened, and charging current is made no longer to reduce；
I, under the action of euqalizing current, the monomer actual charge current for reaching predetermined voltage is almost 0, and not up to predetermined electricity
Its charging current of the monomer of pressure is then 40mA；
J, through charging after a period of time, all monomer battery voltages can reach predetermined voltage；
K, after detecting that all 16 cell voltages all reach 3.6V；
L, BMS sends out signal control charger and stops charging.
Charge to battery pack and be used cooperatively with to the balanced of battery pack, equal balance system can be with battery pack integrate also with
Charging system is integrated, or to be used alone, and balanced way can be balanced passive type fever or active shunting or electric current
Compensating equalization.
Charging modes are multistage constant-current charge, and the electric current of afterbody constant-current charge should be not higher than the 1 of euqalizing current
~5 times.
In multistage charging process, according to the limitation voltage of every grade of setting, the single battery in battery pack is possible to multiple
Reach balanced cut-in voltage, but balance system is only just opened when charging current is not higher than 1~5 times of euqalizing current, and when every
When battery reaches setting voltage after the unlatching of equal balance system, charger is turned off.
In use, balance system is charged under BNS whole-process controls by the mutually coordinated control of communication bus with charger,
Quick charge is initially carried out to battery pack with larger current in charging, until BMS detects any one monomer electricity in battery pack
When pond reaches setting voltage, BMS sends out control signal by communication interface makes charger reduce charging current, at this time once charging
Electric current declines, and all voltages necessarily decline in entire battery pack, and battery cell voltage starts again after a period of time of charging
Rise, when any one monomer reaches setting value, BMS sends out control signal again makes charger reduce charging current again,
Repeatedly, until current value reaches the value of a very little（This value is usually no more than 3~5 times of euqalizing current value）, and this is very
Small current value will not damage equal balance system completely, open equal balance system at this time, since charging current compares euqalizing current at this time
Gap is not too big, therefore portfolio effect is obvious, and in this way under balanced systemic effect, every battery can be when shorter
The interior assigned voltage that reaches is fully charged, can turn off charger at this time；It can ensure with the shorter time be full of all batteries,
And will not overcharge, and have the latter stage low current charge acted on battery maintenance concurrently, battery is drawn since self-discharge rate is inconsistent
Rise charging state it is inconsistent have fairly good role of correcting, greatly extend the cycle life of battery pack.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding without departing from the principles and spirit of the present invention can carry out these embodiments a variety of variations, modification, replace
And modification, the scope of the present invention is defined by the appended.
Claims (4)
1. the charge balancing control method for power lithium ion accumulator group, it is characterised in that：Its charge balancing controlling party
Method includes the following steps：
A, BMS and charger are designed with 2.0 communication interfaces of Open CAN, and are connected with each other to control charging current；
When B, charging, the BMS circuits in battery pack detect each monomer voltage；
C, when there is no monomer voltage to be more than 3.6V, according to normal charging current（10A）Charging；
D, when detecting that any one monomer voltage is more than 3.6V, BMS is communicated by communication interface and charger, charger
Charging current is controlled, charging current is reduced into 5A；
E, it charges after a period of time, battery cell voltage is begun to ramp up again, and repeats step D；
F, when any one monomer reaches specified value, BMS controls charger and reduces current value again；
G, reduce by 10 grades of electric current, ultimate current is reduced to 40mA；
H, equal balance system is opened, and charging current is made no longer to reduce；
I, under the action of euqalizing current, the monomer actual charge current for reaching predetermined voltage is almost 0, and not up to predetermined electricity
Its charging current of the monomer of pressure is then 40mA；
J, through charging after a period of time, all monomer battery voltages can reach predetermined voltage；
K, after detecting that all 16 cell voltages all reach 3.6V；
L, BMS sends out signal control charger and stops charging.
2. the charge balancing control method according to claim 1 for power lithium ion accumulator group, feature exists
In：Charge to battery pack and be used cooperatively with to the balanced of battery pack, equal balance system can be with battery pack integrate also with charging
The system integration, or to be used alone, balanced way can be balanced passive type fever or active shunting or current compensation
It is balanced.
3. the charge balancing control method according to claim 2 for power lithium ion accumulator group, feature exists
In：Charging modes are multistage constant-current charge, and the electric current of afterbody constant-current charge should be not higher than 1~5 times of euqalizing current.
4. the charge balancing control method for power lithium ion accumulator group according to claim 1-3, feature
It is：In multistage charging process, according to the limitation voltage of every grade of setting, the single battery in battery pack is possible to repeatedly reach
Balanced cut-in voltage, but balance system is only just opened when charging current is not higher than 1~5 times of euqalizing current, and work as every electricity
When pond reaches setting voltage after the unlatching of equal balance system, charger is turned off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810109394.2A CN108347073A (en) | 2018-02-05 | 2018-02-05 | Charge balancing control method for power lithium ion accumulator group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810109394.2A CN108347073A (en) | 2018-02-05 | 2018-02-05 | Charge balancing control method for power lithium ion accumulator group |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112886671A (en) * | 2021-03-05 | 2021-06-01 | 深圳逸驰云动科技有限公司 | Battery charging state detection method, detection device and charging device |
| CN114256941A (en) * | 2022-03-01 | 2022-03-29 | 深圳英集芯科技股份有限公司 | Charging circuit, device and equipment |
| WO2023245577A1 (en) * | 2022-06-23 | 2023-12-28 | 宁德时代新能源科技股份有限公司 | Battery charging control method and apparatus, electronic device, and storage medium |
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| CN101820085A (en) * | 2010-04-09 | 2010-09-01 | 江苏华富能源有限公司 | Charge control method for power lithium ion storage battery |
| CN101917036A (en) * | 2010-07-28 | 2010-12-15 | 镇江恒驰科技有限公司 | Dynamically balanced charging and discharging method for battery management system |
| CN102074991A (en) * | 2011-01-24 | 2011-05-25 | 启明信息技术股份有限公司 | Method and device for full balance control of power battery of electric automobile |
| CN102231546A (en) * | 2011-06-30 | 2011-11-02 | 武汉市菱电汽车电子有限责任公司 | Battery management system with balanced charge and discharge functions and control method thereof |
| CN103560561A (en) * | 2013-11-08 | 2014-02-05 | 北京九高科技有限公司 | Balancing charging and discharging device of lithium battery management system |
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2018
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101820085A (en) * | 2010-04-09 | 2010-09-01 | 江苏华富能源有限公司 | Charge control method for power lithium ion storage battery |
| CN101917036A (en) * | 2010-07-28 | 2010-12-15 | 镇江恒驰科技有限公司 | Dynamically balanced charging and discharging method for battery management system |
| CN102074991A (en) * | 2011-01-24 | 2011-05-25 | 启明信息技术股份有限公司 | Method and device for full balance control of power battery of electric automobile |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112886671A (en) * | 2021-03-05 | 2021-06-01 | 深圳逸驰云动科技有限公司 | Battery charging state detection method, detection device and charging device |
| CN114256941A (en) * | 2022-03-01 | 2022-03-29 | 深圳英集芯科技股份有限公司 | Charging circuit, device and equipment |
| CN114256941B (en) * | 2022-03-01 | 2023-02-28 | 深圳英集芯科技股份有限公司 | Charging circuit, device and equipment |
| WO2023245577A1 (en) * | 2022-06-23 | 2023-12-28 | 宁德时代新能源科技股份有限公司 | Battery charging control method and apparatus, electronic device, and storage medium |
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Application publication date: 20180731 |