CN109638922A - A kind of direct balance control method of series-connected cell group twin voltage - Google Patents
A kind of direct balance control method of series-connected cell group twin voltage Download PDFInfo
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- CN109638922A CN109638922A CN201910024823.0A CN201910024823A CN109638922A CN 109638922 A CN109638922 A CN 109638922A CN 201910024823 A CN201910024823 A CN 201910024823A CN 109638922 A CN109638922 A CN 109638922A
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- end voltage
- voltage
- single battery
- battery
- equalizing circuit
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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
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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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 direct balance control methods of series-connected cell group twin voltage.Twin voltage refers to maximum single battery end voltage and the smallest single battery end voltage in all single batteries of series-connected cell group, direct equilibrium refers to, in balancing procedure, n-th (n is odd number, n=1,3,5 ...) a balanced period carries out equalization discharge to the corresponding single battery of most big end voltage, (n+1)th period carries out charge balancing to the corresponding single battery of smallest end voltage, successively alternately to most big end voltage single battery equalization discharge and smallest end voltage single battery charge balancing, stop equilibrium until meeting consistency of battery pack index.The present invention can greatly improve the balancing speed of battery pack end voltage on the basis of existing hardware, or reduce the volume of energy-storage travelling wave tube under the premise of balancing procedure transfer phase shift is co-energy.The control method is suitable for battery pack equilibrium management system.
Description
Technical field
The present invention relates to a kind of series-connected cell group balance control methods, are suitable for new-energy automobile or micro-grid energy storage system
Middle battery management system.
Background technique
Due to the inconsistency of single battery in battery pack, after leading to battery pack charging complete, partial monosomy battery is not
It is full of；After the completion of battery power discharge, partial monosomy battery is not discharged, as a result, the actually available capacity of battery pack is than each monomer
The sum of capacity of battery reduces, also, the cycle life of battery pack is also affected, and the effect of equalizing circuit is reduction monomer
Influence of the battery inconsistency to integral battery group, and then battery pack power utilization rate is improved, extend battery pack service life.
Battery pack balancing studies it as the most important function of battery management system, lot of domestic and foreign scholar.
The research of balancing technique includes the research of equalizing circuit structure and the research of balance control method.The content of present invention is related to balanced control
The research of method processed.Research for equalizing circuit control method, emphasis are to determine balanced index, balanced index common at present
Include battery terminal voltage, battery SOC or internal resistance of cell etc..
Series-connected cell group equilibrium diagnosis and consistency are ground by Beijing Jiaotong University Jiang Jiuchun, Zhang Caiping professor team
Study carefully, proposes that SOC changes compared to capacity, holds voltage, internal resistance, it is bigger on the influence of the consistency of battery pack, it can more reflect battery pack
Inconsistency, not no terminal voltage, capacity can also have an impact consistency.HeFei University of Technology Liu Xintian researcher sets
A kind of novel equilibrium topology based on power inductance is counted out, portfolio effect is good, but has no and illustrate selection SOC from principle
The reason of as balanced index.The Hong Kong Polytechnic University Yuanmao et al. proposes the topological structure using capacitor transmitting balanced energy,
Using battery terminal voltage as balanced index, although precision with higher, does not explain and select end voltage as balanced index
The reason of.Pohang University of Science and Technology Kyung-MinLee et al., Malaysian national energy university Mohammad et al. and I
Shandong University, state Zhang Chenghui et al. has devised the active equalization circuit based on transformer, refers to using battery terminal voltage as equilibrium
Mark, although it is with good portfolio effect, transformer type equalizing circuit scalability is poor, when the monomer electricity that battery pack includes
When pond quantity changes, need to redesign circuit, and there may be magnetic flux leakages for transformer.The Hong Kong Polytechnic University Dah-
Chuan et al. has gone out high-precision balanced topology using inductance, capacitor design simultaneously, although precision is higher, but its structure is complex,
It may be not appropriate for practical application.
In general, the research of balance control method at present is mostly balanced index, future, design with single battery end voltage
It quickly direct balanced topological structure, exploration can more can reflect the balanced index of consistency of battery pack, be battery pack balancing skill
The goal in research of art.
Summary of the invention
The present invention relates to the researchs of balance control method, using battery terminal voltage as balanced index, by the equal of charging process
Weighing apparatus control and the Balance route of discharge process are combined into one, during charge and discharge balancing, the not only high single battery of opposite end voltage
Equalization discharge is carried out, the single battery for also wanting opposite end voltage low carries out charge balancing, and final realize improves balancing speed, Huo Zhetong
Under the conditions of the balancing speed of sample, reduce euqalizing current, and then reduces influence of the balancing procedure to single battery performance.
Based on this, the present invention is proposed with highest single battery end voltage in series-connected cell group and minimum single battery end
Voltage formulates balance control method collectively as balanced index.
Further, this method includes the following contents:
(1) balanced index is set
The difference of maximum single battery end voltage and minimum single battery end voltage is as balanced index using in battery pack, if each list
The end voltage of body battery is Ui, maximum end voltage is Umax, smallest end voltage is Umin, it enables:
D=Umax-Umin(1)
Set the critical parameters D of equalizing circuit workref.If D > Dref, equalizing circuit is started to work, if D < Dref, equalizing circuit is not
Work.
(2) balancing procedure
Balancing procedure includes several sampling periods, and each sampling period includes several balanced periods, in each sampling period, voltage
Detection circuit and control circuit detect and judge whether each monomer battery voltage meets equalizing circuit operating condition, if not satisfied,
Equalizing circuit does not work, if satisfied, equalizing circuit works, the high battery of odd number equilibrium period opposite end voltage carries out equalization discharge,
The low single battery charge balancing of even number equilibrium period opposite end voltage, so alternately, until each monomer battery voltage meets battery
Group coincident indicator.
(3) balancing procedure terminates
One sampling period terminates, if each single battery end voltage meets equalizing circuit operating condition, equalizing circuit works on,
If being unsatisfactory for equalizing circuit operating condition, equalizing circuit stops working, and balancing procedure terminates.
Beneficial point of the invention is: using highest single battery end voltage and minimum single battery end voltage difference as one
Cause property index, balancing procedure realizes the reduction of most significant end voltage and the raising of least significant end voltage simultaneously, and then fast implements battery
Group each single battery end voltage reaches unanimity.
Detailed description of the invention
It, below will be to of the present invention in order to more clearly illustrate the technical solution in the principle of the present invention and implementation
Technical solution is further introduced using figure, is only section Example of the invention with the following figure, for art technology
For personnel, other technical solutions can be obtained according to the following figure without creative efforts.
Fig. 1 is control method schematic diagram of the present invention；
Fig. 2 is a kind of balanced topology example schematic diagram applied by control method of the present invention；
Fig. 3 is that simulation model schematic diagram is established in MATALB/Simulink for equilibrium shown in Fig. 2 is topological；
Fig. 4 is the euqalizing current schematic diagram in univoltage control method balanced topology shown in Fig. 2；
Fig. 5 is the change curve of each monomer battery voltage of 20s before univoltage equalizing circuit works；
Euqalizing current schematic diagram in the direct balance control method of Fig. 6 twin voltage of the present invention balanced topology shown in Fig. 2；
Fig. 7 is the change curve of each monomer battery voltage of 10s before twin voltage equalizing circuit works.
Specific embodiment
As shown in Figure 1, a kind of direct balance control method of series-connected cell group twin voltage, twin voltage refer to highest in battery pack
Single battery end voltage and minimum single battery end voltage, direct equilibrium refer to the Balance route of charging process and electric discharge
The Balance route of process is combined into one, in n-th (n is odd number, n=1,3,5,7) a balanced period to most significant end
The corresponding single battery equalization discharge of voltage, (n+1)th balanced period to the corresponding single battery charge balancing of least significant end voltage,
This control method method is reliable, on-line operation amount is small, is remarkably improved battery pack balancing speed, improve energy content of battery utilization rate,
Extend battery life.
The direct balance control method of twin voltage comprising the steps of:
(1) balanced index is set
The difference of maximum single battery end voltage and minimum single battery end voltage is as balanced index using in battery pack, if each list
The end voltage of body battery is Ui, maximum end voltage is Umax, smallest end voltage is Umin, it enables:
D=Umax-Umin(1)
Set the critical parameters D of equalizing circuit workref.If D > Dref, equalizing circuit is started to work, if D < Dref, equalizing circuit is not
Work.
(2) balancing procedure
Balancing procedure includes several sampling periods, and each sampling period includes several balanced periods, in each sampling period, voltage
Detection circuit and control circuit detect and judge whether each monomer battery voltage meets equalizing circuit operating condition, if not satisfied,
Equalizing circuit does not work, if satisfied, equalizing circuit works, the high battery of odd number equilibrium period opposite end voltage carries out equalization discharge,
The low single battery charge balancing of even number equilibrium period opposite end voltage, so alternately, until each monomer battery voltage meets battery
Group coincident indicator.
(3) balancing procedure terminates
One sampling period terminates, if each single battery end voltage meets equalizing circuit operating condition, equalizing circuit works on,
If being unsatisfactory for equalizing circuit operating condition, equalizing circuit stops working, and balancing procedure terminates.
For the topology of the equalizing circuit shown in Fig. 2, to verify the direct Balance route side of series-connected cell group twin voltage of the present invention
The superiority of method.
Such as Fig. 3, simulation model is established in MATALB/Simulink for the equilibrium topology shown in Fig. 2；
Univoltage balance control method is applied in Fig. 2 topology, with charge balancing, (in charging process, opposite end voltage is high
Single battery carries out equalization discharge) for, Fig. 4 is euqalizing current, and Fig. 5 is each single battery end electricity of 20s before equalizing circuit works
The change curve of pressure.As shown in Figure 5 equalizing circuit work after, the corresponding single battery charging rate of most significant end voltage compared to
The corresponding single battery charging rate of least significant end voltage slows down, and the equilibrium state of setting is reached to 13s moment battery pack.
The direct balance control method of twin voltage of the present invention is applied in Fig. 2 topology, setting and univoltage Balance route side
The identical signal sampling period of method, the accuracy of equalization, end voltage primary condition, balanced period and control signal dutyfactor, with charging
For equilibrium, Fig. 6 is euqalizing current, and Fig. 7 is the change curve of each single battery end voltage of 10s before equalizing circuit works.By Fig. 7
After knowing equalizing circuit work, the 4s moment is arrived, battery pack reaches the equilibrium state of setting, subsequent each single battery charging rate
Identical, end voltage is gradually increasing to be compared with univoltage balance control method, same hardware condition and euqalizing current, the present invention
The mentioned direct balance control method balancing speed of twin voltage significantly improves.
Claims (4)
1. a kind of direct balance control method of series-connected cell group twin voltage, it is characterised in that: refer to adjacent two balanced weeks
Phase respectively carries out two end voltages of battery pack balanced；Described two end voltage indexes refer in all single batteries most
Big end voltage and smallest end voltage；Single battery corresponding to the most big end voltage is n-th of period to its equalization discharge,
Single battery corresponding to the smallest end voltage is (n+1)th period to its charge balancing；Wherein n is odd number.
2. the direct balance control method of series-connected cell group twin voltage as described in claim 1, which is characterized in that include following step
It is rapid:
(1) it is detected by voltage detecting circuit and control circuit and judges whether the consistency of each single battery end voltage meets equilibrium
Circuit operating conditions；
(2) such as meet equalizing circuit operating condition, equalizing circuit is started to work；It is such as unsatisfactory for, equalizing circuit does not work；
(3) balancing procedure includes several sampling periods, and each sampling period includes several balanced cycle Ts, odd cycle pair
Hold the highest single battery equalization discharge of voltage, the minimum single battery charge balancing of even cycle opposite end voltage；
(4) each sampling period terminates, and voltage detecting circuit and control circuit detect again and judge each single battery end voltage
Whether equalizing circuit operating condition is met；
(5) and so on, until single battery consistency is unsatisfactory for equalizing circuit operating condition, equalizing circuit stops working.
3. the direct balance control method of series-connected cell group twin voltage according to claim 1 or 2, it is characterised in that: described
Battery pack is lead-acid battery or lithium ion battery.
4. the direct balance control method of series-connected cell group twin voltage according to claim 3, it is characterised in that: be suitable for electricity
Appearance type equalizing circuit, converter type equalizing circuit and transformer type equalizing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910024823.0A CN109638922A (en) | 2019-01-11 | 2019-01-11 | A kind of direct balance control method of series-connected cell group twin voltage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910024823.0A CN109638922A (en) | 2019-01-11 | 2019-01-11 | A kind of direct balance control method of series-connected cell group twin voltage |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060097698A1 (en) * | 2004-11-11 | 2006-05-11 | Plett Gregory L | Method and system for cell equalization using state of charge |
| CN105449740A (en) * | 2015-11-13 | 2016-03-30 | 中国东方电气集团有限公司 | Energy storage lithium battery active balancing control system and control method |
| CN107369858A (en) * | 2017-08-02 | 2017-11-21 | 河南理工大学 | A kind of battery pack Bi-objective equalizing circuit control strategy stage by stage |
| CN107733007A (en) * | 2017-09-28 | 2018-02-23 | 河南理工大学 | A kind of direct equalizing circuit of battery pack Bi-objective and equalization methods |
| CN108539300A (en) * | 2018-04-27 | 2018-09-14 | 上海蓝诺新能源技术有限公司 | The electric quantity balancing method and system of battery pack |
-
2019
- 2019-01-11 CN CN201910024823.0A patent/CN109638922A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060097698A1 (en) * | 2004-11-11 | 2006-05-11 | Plett Gregory L | Method and system for cell equalization using state of charge |
| CN105449740A (en) * | 2015-11-13 | 2016-03-30 | 中国东方电气集团有限公司 | Energy storage lithium battery active balancing control system and control method |
| CN107369858A (en) * | 2017-08-02 | 2017-11-21 | 河南理工大学 | A kind of battery pack Bi-objective equalizing circuit control strategy stage by stage |
| CN107733007A (en) * | 2017-09-28 | 2018-02-23 | 河南理工大学 | A kind of direct equalizing circuit of battery pack Bi-objective and equalization methods |
| CN108539300A (en) * | 2018-04-27 | 2018-09-14 | 上海蓝诺新能源技术有限公司 | The electric quantity balancing method and system of battery pack |
Non-Patent Citations (1)
| Title |
|---|
| 刘征宇等: "基于动态模糊阈值的电池组均衡策略优化", 《中国机械工程》 * |
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Application publication date: 20190416 |