CN106828142B - A kind of power battery active equalization method - Google Patents
A kind of power battery active equalization method Download PDFInfo
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- CN106828142B CN106828142B CN201611202659.0A CN201611202659A CN106828142B CN 106828142 B CN106828142 B CN 106828142B CN 201611202659 A CN201611202659 A CN 201611202659A CN 106828142 B CN106828142 B CN 106828142B
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- battery
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- pressure difference
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- 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
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
- B60L58/13—Maintaining the SoC within a determined range
-
- 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/547—Voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
This disclosure of the invention a kind of power battery active equalization method, this technical solution are monitored by the voltage to each single battery in battery pack group, if battery pack variance S is greater than preset value K, the first pressure difference VmGreater than critical value A, the second pressure difference VnWhen meeting greater than any one in critical value A, open the switch of corresponding single battery, monomer battery voltage energy is shifted using the charge-discharge principle of capacitor, realize to the electric voltage equalization of single battery so that the single battery in battery pack will not because of energy excessively high or too low influence vehicle performance.In addition, this technical solution can also carry out in advance energy transfer to certain single batteries without departing from critical value A but beyond critical value B, realizes preequalization, balanced effect is also improved while saving energy.
Description
Technical field
The present invention relates to electric automobile power battery equilibrium fields, more particularly to a kind of power battery active equalization side
Method.
Background technique
It is more and more as the electric car of power supply using lithium ion battery.In order to meet the needs of high pressure bulky capacitor, one
As battery pack is used in series.But in use, difference existing for different monomers makes charge and discharge in battery unit use process
Electric rate is different.Especially after high current charge-discharge, group difference infinitely amplifies, and the capacity between each monomer mismatches, and makes
At partial monosomy super-charge super-discharge.The long-term unbalanced capacity that will seriously affect entire battery pack and service life, this just needs balanced skill
Art.
Current active equalization technology mostly uses the modes such as capacitor, inductance, transformer, DC/DC converter.Condenser type is balanced
Structure is simple, but energy transfer always occurs between two section monomers, if only a certain section monomer energy is excessively high or too low, nothing
Method sets control strategy, and euqalizing current is smaller.Inductance type balanced energy transmits between adjacent monomer, needs balanced monomer electricity
Pond relatively far apart when need multiple intermediate conveyor, under balancing speed, increase energy loss.Transformer type equilibrium and Buck-Boost
The control of converter balance policy is complicated, and design difficulty is big, and cost is excessively high.
Summary of the invention
The purpose of the present invention is overcoming shortcoming in the prior art, a kind of power battery active equalization method is provided.
The purpose of the present invention is achieved through the following technical solutions:
A kind of power battery active equalization method, includes the following steps,
S01: the voltage of each single battery in battery pack is read；
S02: the average voltage V of battery pack is calculatedavg=(V1+......+VN)/N, the first pressure difference Vm=Vmax-Vavg,
Two pressure difference Vn=Vavg-Vmin, battery pack variance S, wherein N be batteries monomer battery number, VmaxFor highest in battery pack
Monomer battery voltage, VminFor monomer battery voltage minimum in battery pack；
S03: if battery pack variance S is greater than preset value K, the first pressure difference VmGreater than critical value A, the second pressure difference VnIt is greater than
When any one in critical value A meets, step S04 is executed；Otherwise return step S01；
S04: to ceiling voltage VmaxCorresponding single battery and/or minimum voltage VminCorresponding single battery carries out balanced
Return step S01 afterwards.
The step S04 in one of the embodiments, specifically:
S041: if the first pressure difference VmMore than or equal to critical value B, step S042 is executed；It is no to then follow the steps S043,
Wherein critical value B is not more than critical value A；
S042: by ceiling voltage VmaxCorresponding single battery equalization discharge is to average voltage VavgStep S043 is executed afterwards；
S043: if the second pressure difference VnMore than or equal to critical value B, S044 is thened follow the steps；Otherwise return step
S01；
S044: by minimum voltage VminCorresponding single battery charge balancing is to average voltage VavgReturn step S01 afterwards.
In one of the embodiments, before the step S041 further include:
S0411: if the first pressure difference VmMore than or equal to the second pressure difference Vn, then follow the steps S041；Otherwise, step is executed
S0412；
S0412: after charging by battery pack or backup power source to equilibrium capacitor C, step S041 is executed.
It is in one of the embodiments, minimum voltage V to the energy that equilibrium capacitor C charges in the step S0412min
Corresponding single battery equilibrium is to average voltage VavgRequired energy.
The critical value B is equal to the half of the critical value A in one of the embodiments,.
The critical value B is equal to 2/3rds of the critical value A in one of the embodiments,.
The critical value B is equal to 3/4ths of the critical value A in one of the embodiments,.
It is needed before return step S01 through preset time T after executing the step S03 in one of the embodiments,.
The time T is between [10ms, 20ms] in one of the embodiments,.
This technical solution have compared with the prior art it is following the utility model has the advantages that
1. this technical solution passes through highest pressure difference Vm, minimum pressure difference Vn, battery pack variance S to determine whether need
It is more reasonable than conventionally employed maximal difference to single battery equilibrium.When can avoid certain needs equilibriums, using maximum difference
Method equilibrium is less than in turn resulting in unreasonable situation balanced to single battery.
2. enabling equilibrium when poor by single battery consistency each in battery pack variance S realization battery pack, further mentioning
The reasonability and reliability of this high technical solution.
3. this technical solution can also determine to face when the voltage of the higher single battery of some energy in battery pack reaches
Dividing value A, though and the difference not up to critical value A of the very low single battery and average value of another energy, be more than critical value B
When, by the energy transfer of the higher single battery of energy into the lower single battery of energy, realizes preequalization, save energy
Balanced effect is also improved simultaneously, further promotes the reasonability of this technical solution.
4. single battery of the single battery of overtension to brownout can be carried out equalization discharge by this programme, it is implemented as
To equilibrium, equalization efficiency is high.
5. periodically carrying out voltage inspection to the single battery in battery pack with setting time T under battery pack non-balanced state
It surveys and equilibrium judges, further increase the reasonability and safety of the technical program, while saving the resource of system runs program.
Detailed description of the invention
Fig. 1 is the power battery active equalization method flow diagram in the present embodiment；
Fig. 2 is the power battery active equalization circuit of the present embodiment.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give better embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more the disclosure
Add thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more
Any and all combinations of relevant listed item.
It is as shown in Figure 1 power battery active equalization method flow chart, includes the following steps,
S01: the voltage of each single battery in battery pack is read；
S02: the average voltage V of battery pack is calculatedavg=(V1+......+VN)/N, the first pressure difference Vm=Vmax-Vavg,
Two pressure difference Vn=Vavg-Vmin, battery pack variance S, wherein N be batteries monomer battery number, VmaxFor highest in battery pack
Monomer battery voltage, VminFor monomer battery voltage minimum in battery pack；
S03: if battery pack variance S is greater than preset value K, the first pressure difference VmGreater than critical value A, the second pressure difference VnIt is greater than
When any one in critical value A meets, step S04 is executed；Otherwise return step S01；
S04: to ceiling voltage VmaxCorresponding single battery and/or minimum voltage VminCorresponding single battery carries out balanced
Return step S01 afterwards.
Further, the step S04 specifically:
S041: if the first pressure difference VmMore than or equal to critical value B, step S042 is executed；It is no to then follow the steps S043,
Wherein critical value B is not more than critical value A；
S042: by ceiling voltage VmaxCorresponding single battery equalization discharge is to average voltage VavgStep S043 is executed afterwards；
S043: if the second pressure difference VnMore than or equal to critical value B, S044 is thened follow the steps；Otherwise return step
S01；
S044: by minimum voltage VminCorresponding single battery charge balancing is to average voltage VavgReturn step S01 afterwards.
Further, before the step S041 further include:
S0411: if the first pressure difference VmMore than or equal to the second pressure difference Vn, then follow the steps S041；Otherwise, step is executed
S0412；
S0412: after charging by battery pack or backup power source to equilibrium capacitor C, step S041 is executed.
It further, is minimum voltage V to the energy that equilibrium capacitor C charges in the step S0412minCorresponding monomer
It is battery balanced to average voltage VavgRequired energy.
In the present embodiment, the critical value B is equal to the half of the critical value A.
According to practical concrete condition, the critical value B is equal to 2/3rds of the critical value A.
According to practical concrete condition, the critical value B is equal to 3/4ths of the critical value A.
Further, it is needed before return step S01 through preset time T after executing the step S03.
In the present embodiment, the time T is between [10ms, 20ms].
It is illustrated in figure 2 power battery active equalization circuit, the specific equalization methods of the present embodiment circuit are, according to default
The rule of setting selects the battery for being discharged and being charged, and will have ceiling voltage VmaxSingle battery both sides it is corresponding
It closes the switch, by DC/DC converter, i.e. Buck-Boost converter and single-pole double-throw switch (SPDT) in Fig. 2, to balanced capacitor C
It charges, after charging complete, there is ceiling voltage VmaxSingle battery in excessive energy transfer to balanced capacitor C, this
When disconnect to inductive switch complete to ceiling voltage VmaxSingle battery equilibrium；Closure has minimum voltage VminMonomer
The corresponding switch of battery, balanced capacitor C discharge to battery by DC/DC converter, will have minimum voltage VminMonomer
Battery disconnects after completing equilibrium to inductive switch, and balancing procedure is completed at this time.
It should also be noted that, opening when the variance variance S of battery pack is greater than preset value K and forcing equilibrium, this setting is
When each single battery is less than equilibrium condition in order to prevent but the excessively high special mechanism taken of the inconsistency of each single battery.Variance
S is larger but highest highest pressure difference VmWith minimum pressure difference VnWhen all without departing from critical value A, enables and force equilibrium, further mention
The reasonability and reliability of this high technical solution.
It should also be noted that, with setting time T periodically to the monomer in battery pack under battery pack non-balanced state
Battery carries out voltage detecting and balanced judgement, further increases the reasonability and safety of the technical program, while saving system
Run the resource of program.A kind of power battery active equalization method of this disclosure of the invention, includes the following steps, S01: reading electricity
The voltage of each single battery of Chi Zuzhong；S02: the average voltage V of battery pack is calculatedavg=(V1+......+VN)/N, the first pressure difference
Value Vm=Vmax-Vavg, the second pressure difference Vn=Vavg-Vmin, battery pack variance S, wherein N be batteries monomer battery number,
VmaxFor monomer battery voltage highest in battery pack, VminFor monomer battery voltage minimum in battery pack；S03: if battery pack
Variance S is greater than preset value K, the first pressure difference VmGreater than critical value A, the second pressure difference VnMeet greater than any one in critical value A
When, execute step S04；It is no to then follow the steps S01；S04: to ceiling voltage VmaxCorresponding single battery and/or minimum voltage
VminCorresponding single battery executes step S01 after carrying out equilibrium.This technical solution passes through in real time to each monomer in battery pack
The voltage of battery is monitored, if battery pack variance S is greater than preset value K, the first pressure difference VmGreater than critical value A, the second pressure difference
Value VnWhen meeting greater than any one in critical value A, the switch of corresponding single battery is opened, the charge-discharge principle pair of capacitor is utilized
Monomer battery voltage energy is shifted, and the electric voltage equalization to single battery is realized, so that the single battery in battery pack will not
Because energy is excessively high or too low influence vehicle performance.
Only several embodiments of the present invention are expressed for embodiment described above, and the description thereof is more specific and detailed, but
It cannot be construed as a limitation to the scope of the present invention.It should be pointed out that for the ordinary skill people of this field
For member, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to of the invention
Protection scope.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (7)
1. a kind of power battery active equalization method, which is characterized in that include the following steps,
S01: the voltage of each single battery in battery pack is read；
S02: the average voltage V of battery pack is calculatedavg=(V1+......+VN)/N, the first pressure difference Vm=Vmax-Vavg, second pressure
Difference Vn=Vavg-Vmin, battery pack variance S, wherein N be batteries monomer battery number, VmaxFor list highest in battery pack
Body cell voltage, VminFor monomer battery voltage minimum in battery pack；
S03: if battery pack variance S is greater than preset value K, the first pressure difference VmGreater than critical value A, the second pressure difference VnGreater than critical
When any one in value A meets, step S04 is executed；Otherwise return step S01；
S04: to ceiling voltage VmaxCorresponding single battery and/or minimum voltage VminCorresponding single battery returns after carrying out equilibrium
Return step S01；
The step S04 specifically:
S041: if the first pressure difference VmMore than or equal to critical value B, step S042 is executed；It is no to then follow the steps S043, wherein
Critical value B is not more than critical value A；
S042: by ceiling voltage VmaxCorresponding single battery equalization discharge is to average voltage VavgStep S043 is executed afterwards；
S043: if the second pressure difference VnMore than or equal to critical value B, S044 is thened follow the steps；Otherwise return step S01；
S044: by minimum voltage VminCorresponding single battery charge balancing is to average voltage VavgReturn step S01 afterwards；
Before the step S041 further include:
S0411: if the first pressure difference VmMore than or equal to the second pressure difference Vn, then follow the steps S041；Otherwise, step is executed
S0412；
S0412: after charging by battery pack or backup power source to equilibrium capacitor C, step S041 is executed.
2. power battery active equalization method according to claim 1, which is characterized in that equal in the step S0412
The energy that capacitor C charges that weighs is minimum voltage VminCorresponding single battery equilibrium is to average voltage VavgRequired energy.
3. power battery active equalization method according to claim 1, which is characterized in that the critical value B is equal to described
The half of critical value A.
4. power battery active equalization method according to claim 1, which is characterized in that the critical value B is equal to described
2/3rds of critical value A.
5. power battery active equalization method according to claim 1, which is characterized in that the critical value B is equal to described
3/4ths of critical value A.
6. power battery active equalization method according to claim 1, which is characterized in that after executing the step S03
It needs before return step S01 through preset time T.
7. power battery active equalization method according to claim 6, which is characterized in that the time T [10ms,
20ms] between.
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| CN109193863A (en) * | 2018-10-25 | 2019-01-11 | 湖南金杯新能源发展有限公司 | Battery voltage balance control method and circuit |
| CN111446760B (en) * | 2020-04-14 | 2024-01-16 | 深圳欣旺达智能科技有限公司 | Battery equalization management method, circuit, device and storage medium |
| CN115360793B (en) * | 2022-09-15 | 2024-06-11 | 湖北亿纬动力有限公司 | Battery pack equalization method, device, battery system and storage medium |
| CN116125325B (en) * | 2022-12-06 | 2024-10-01 | 北汽福田汽车股份有限公司 | Method and device for detecting consistency of battery cells, vehicle and storage medium |
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| CN105515110A (en) * | 2016-01-01 | 2016-04-20 | 三峡大学 | Electric automobile ordered charging real-time control system |
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| JP2010028886A (en) * | 2008-07-15 | 2010-02-04 | Toyota Motor Corp | System for controlling charge and discharge of energy storage device |
| JP2014138536A (en) * | 2013-01-18 | 2014-07-28 | Toyota Motor Corp | Vehicle power supply device |
| US9236749B2 (en) * | 2013-04-08 | 2016-01-12 | GM Global Technology Operations LLC | Vehicle battery system balancing systems and methods |
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| CN1545754A (en) * | 2001-03-30 | 2004-11-10 | 运输设计有限公司 | Battery management unit, system and method |
| CN103415778A (en) * | 2011-02-22 | 2013-11-27 | Sk新技术株式会社 | SOC correcting system having multiple packs in parallel |
| CN105515110A (en) * | 2016-01-01 | 2016-04-20 | 三峡大学 | Electric automobile ordered charging real-time control system |
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