CN108321906A - A kind of power battery pack static equilibrium control method - Google Patents
A kind of power battery pack static equilibrium control method Download PDFInfo
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- CN108321906A CN108321906A CN201810218020.4A CN201810218020A CN108321906A CN 108321906 A CN108321906 A CN 108321906A CN 201810218020 A CN201810218020 A CN 201810218020A CN 108321906 A CN108321906 A CN 108321906A
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- Prior art keywords
- battery pack
- power battery
- balanced
- condition
- monomer
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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
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
-
- 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
Abstract
The invention discloses a kind of power battery pack static equilibrium control methods, including：Using Vehicular charger or charging pile to power battery pack carry out trickle charge it is fully charged after, judge whether battery pack meets preset balanced entry condition, and the power battery monomer to be equalized for meeting balanced entry condition is started balanced, monomer with high voltage is consumed into part electricity by equalizing resistance, is allowed to be consistent with the average voltage of entire power battery pack；After all power battery monomer voltages to be equalized and average monomer voltage are consistent, balanced circuit is disconnected, trickle charge electrical circuit is opened, low current charge is carried out to power battery pack using Vehicular charger or charging pile, until reaching charge cutoff condition；Then judge whether battery pack meets preset balanced entry condition again, until power battery pack reaches balanced suspension condition.The present invention is on the basis of realizing to battery pack balancing, it is possible to reduce the kwh loss that equalizing strip comes ensure that the electricity of battery pack after equilibrium.
Description
Technical field
The present invention relates to automobile batteries technical fields, and in particular to a kind of power battery pack static equilibrium control method.
Background technology
Lithium-ion-power cell is because its energy density is high, open-circuit voltage is high, self-discharge rate is low, has extended cycle life, and without note
Recall effect, it is nuisanceless the advantages that, be commonly used as the major impetus source of electric vehicle at present.Crucial portion as electric vehicle
The performance and used life of part, battery directly affects the working performance and cost of electric vehicle.Since power battery pack is usual
It is made up of series-parallel system using multiple monomers, and single battery characteristic usually has a certain difference, therefore in charge and discharge
In the process, the voltage of each monomer will be not quite similar.When this allows for charging, when a certain single battery reaches charge cutoff voltage,
Still there is the still underfill of partial monosomy battery, power battery pack is caused not to be completely filled with electricity；And when discharging, a certain single battery one
When denier reaches discharge cut-off voltage, whole group battery will be unable to work so that remaining electric quantity of single batteries does not give full play to.
The above reason largely reduces the continual mileage of vehicle, and What is more, it will shortens the service life of power battery pack.Cause
This, improving power battery pack monomer consistency becomes the main standard for weighing battery performance and service life.
At present usually using equalization methods to improve the consistency of power battery pack.Traditional equalization methods are usually dynamic
An equalizing resistance in parallel on power battery cell, and connect equalizing resistance using an equalizer switch.When charging, to high voltage
Single battery start balanced, part electricity is consumed by equalizing resistance, it is horizontal to reach battery pack average voltage.But due to
Equalizing resistance consumes part electricity, and usual this method can cause battery pack not to be completely filled with electricity.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of power battery pack static equilibrium controlling parties
Method is made up after the single battery part electricity for being consumed high voltage using equalizing resistance by increasing the electric link of low current benefit
The electricity of weighing apparatus resistance consumption.
To achieve the goals above, the technical solution adopted by the present invention is：A kind of power battery pack static equilibrium controlling party
Method, the balance control method include the following steps,
Equalization step：After power battery pack is fully charged, judge whether battery pack meets default balanced entry condition, full
When sufficient equilibrium condition, the power battery monomer to be equalized to meeting balanced entry condition starts equilibrium, will be with high voltage
Monomer consumes part electricity by equalizing resistance, is allowed to be consistent with the average voltage of entire power battery pack；
Mend electric step：After all power battery monomer voltages to be equalized and average monomer voltage are consistent, disconnect equal
Weighing apparatus circuit, opens trickle charge electrical circuit, low current charge is carried out to power battery pack using Vehicular charger or charging pile, until reaching
To charge cutoff condition；
Equilibrium stops judgment step：Judge that power battery pack reaches balanced suspension condition, if so, equilibrium terminates, if it is not, returning
Equalization step is returned, judges whether to meet default equilibrium condition.
It is described equilibrium entry condition include：
(1) whether fully charged rear time of repose reaches preset value；
(2) during fully charged standing, whether the minimum monomer voltage of power battery pack reaches preset value；
(3) during fully charged standing, whether power battery pack maximum differential pressure reaches preset value under current state；
(4) during fully charged standing, whether power battery pack distance last balanced interval time reaches preset value；
When meeting condition (1), (2), (3) simultaneously or meeting condition (1), (2), (4) simultaneously, it is equal to judge that battery pack meets
Weigh entry condition.
It is described equilibrium suspension condition be：
(1) add up time for balance and reach preset value；
(2) in balancing procedure, maximum differential pressure controls within preset value, and minimum monomer voltage is more than preset value；
Meet either condition and judge that balanced suspension condition meets, equilibrium terminates.
In mending electric step, battery pack low current charge refers to charging not higher than 0.05C.
The judgment method of power battery monomer to be equalized is：
During standing after power battery pack is fully charged, it is flat that each monomer voltage of power battery pack, battery pack are monitored always
Equal monomer voltage, battery pack stagnation pressure；When power battery pack meets balanced entry condition, it is higher than the battery list of average monomer voltage
Body is determined as power battery monomer to be equalized.
When treating the startup equilibrium of uniform power battery cell, in power battery monomer to be equalized, highest list is chosen successively
The corresponding battery cell of bulk voltage carries out balanced.
The equilibrium circuit refers to the circuit of stroke in parallel between equalizing resistance and battery cell to be equalized；The trickle charge
Electrical circuit refers to the charge circuit of the positive and negative anodes connection of Vehicular charger or charging pile and power battery pack and formation.
Time of repose preset value is 10min~30min after fully charged；Power battery pack distance last balanced interval time
Preset value is 500h~1000h.
In balanced suspension condition, it is no more than 5h to add up time for balance preset value.
The present invention is increased in balancing procedure and is charged to battery pack using low current on the basis of traditional equalization methods,
Electric quantity loss caused by not only compensating for equalizing resistance, while low current charge may make that inside battery active material is lived
Change, battery pack active volume is improved with this, increases the service life of battery pack.
Simultaneously increase " monitoring the minimum monomer voltage of power battery pack whether reach preset value, monitoring power battery pack away from
Whether reach preset value from last balanced interval time " two balanced entry conditions.Relatively high minimum monomer voltage is pre-
If value, it can be ensured that power battery pack is in higher SOC states and starts equilibrium；It suitable equilibrium interval time, can be better
The consistency for controlling each monomer of power battery pack, improves the service life of battery pack.
Description of the drawings
Below to each width attached drawing of description of the invention expression content and figure in label be briefly described：
Fig. 1 is power battery pack balancing control circuit schematic diagram of the present invention；
Fig. 2 is power battery pack static equilibrium control method flow chart of the present invention.
Specific implementation mode
The specific implementation mode of the present invention is made further detailed by the description to optimum embodiment below against attached drawing
Thin explanation.
The present invention provides a kind of power battery pack static equilibrium control methods.This method includes：Use Vehicular charger
Or after charging pile is fully charged to power battery pack progress trickle charge, judge whether battery pack meets preset balanced entry condition, and
Power battery monomer to be equalized to meeting balanced entry condition starts equilibrium, i.e., the monomer with high voltage is passed through equilibrium
Resistance consumption part electricity is allowed to be consistent with the average voltage of entire power battery pack；When all power batteries to be equalized
After monomer voltage and average monomer voltage are consistent, disconnect balanced circuit, open trickle charge electrical circuit, using Vehicular charger or
Charging pile carries out low current charge to power battery pack, until reaching charge cutoff condition；Then whether judge battery pack again
Meet preset balanced entry condition, until power battery pack reaches balanced suspension condition.
It is of the present invention equilibrium entry condition include：Fully charged rear time of repose, distance last balanced interval time,
The minimum monomer voltage of current battery, current battery maximum differential pressure.Wherein, fully charged rear time of repose preset value is preferably
10mi n~30mi n；The last balanced interval time preset value of distance is preferably 500h~1000h；Relatively high minimum list
Bulk voltage preset value, it can be ensured that power battery pack is in higher SOC states and starts equilibrium.
It is of the present invention equilibrium suspension condition include：Accumulative time for balance, maximum differential pressure, minimum monomer voltage.Wherein,
Accumulative time for balance preset value is preferably not greater than 5h；At the end of equilibrium, maximum differential pressure need to control within preset value, and minimum
Monomer voltage is more than preset value, which is in order to ensure power battery pack is in 100%SOC states.It is of the present invention
Low current charge preferred value should be not higher than 0.05C.
In a preferred embodiment, a kind of balance control method of power battery pack is static equilibrium method.This method
More particularly to following steps：
1, judge whether power battery pack meets balanced entry condition
Balanced entry condition is as follows：
1. carrying out charging battery to power battery pack using Vehicular charger or alternating-current charging pile, it is full of when reaching preset
After electric cut-off condition, timer starts to carry out timing to time of repose, and judges whether time of repose reaches preset value, wherein quiet
It is preferably 10mi n~30mi n to set time preset value；
2. during fully charged standing, while monitoring each monomer voltage of power battery pack, and judge that power battery pack is minimum
Whether monomer voltage reaches preset value, which is in order to ensure power battery pack is in higher SOC states；
3. during fully charged standing, while determining whether power battery pack maximum differential pressure reaches default under current state
Value, the preset pressure value generally provide reference value by producer；
4. during fully charged standing, while monitoring whether power battery pack distance last balanced interval time reaches pre-
If value, wherein balanced interval time preset value is preferably 500h~1000h.
During the fully charged standing of power battery pack, if meet simultaneously it is above-mentioned 1. 2. 3. or 1. 2. 4. equilibrium condition when, slowly
Charge circuit disconnects, i.e. charge circuit switch K just bears with K and disconnects.
2, power battery monomer to be equalized is determined
During the fully charged standing of power battery pack, it is average single that each monomer voltage of power battery pack, battery pack are monitored always
Bulk voltage, battery pack stagnation pressure.It is true higher than the battery cell of average monomer voltage when power battery pack meets balanced entry condition
It is set to power battery monomer to be equalized.
3, start balanced
In power battery monomer to be equalized, the corresponding battery cell n of highest monomer voltage is chosen successively and carries out equilibrium, i.e.,
Open the corresponding balanced circuit switching Kn of battery cell n.Multiple monomers electricity can be prevented by choosing battery cell progress equilibrium successively
Balanced discharge makes battery pack fever excessive simultaneously in pond, influences the service life of battery pack.
4, in balancing procedure, each monomer voltage of battery pack is monitored always, up to all battery to be balanced monomer voltages and is put down
Equal monomer voltage is consistent, and average monomer voltage refers to the average monomer voltage monitored when equilibrium starts.
5, after all battery to be balanced monomer voltages and average monomer voltage are consistent, balanced circuit is disconnected, is opened
Trickle charge electrical circuit, i.e. charge circuit switch KJustWith KIt is negativeIt is closed.Power battery pack is carried out using Vehicular charger or charging pile small
Electric current charges, until reaching charge cutoff condition.It is preferred that charging current value should be not higher than 0.05C.
Wherein, the purpose of low current charge：On the one hand, because having lost part electricity in the balancing procedure, use is small
Electric current charging can supplement part electricity, and demand is travelled to meet vehicle.It on the other hand, can effective activation using low current charge
Active material makes more lithium ions participate in reaction, battery may make to complete certain reparation.
6, using low current it is fully charged after, continue to judge whether power battery pack meets balanced entry condition, if it is satisfied,
Then continue equilibrium, that is, return to step 3, until the control of power battery pack maximum differential pressure is within preset value.Judge simultaneously dynamic
Whether power battery pack reaches balanced suspension condition, and balanced suspension condition is as follows：
1. accumulative time for balance reaches preset value, accumulative time for balance preset value is preferably not greater than 5h；
2. in balancing procedure, maximum differential pressure controls within preset value, and minimum monomer voltage is more than preset value, this is default
Value is in order to ensure power battery pack is in 100%SOC states.
Any of the above condition meets, then equilibrium terminates.
Obviously present invention specific implementation is not subject to the restrictions described above, as long as using the methodology and skill of the present invention
The improvement for the various unsubstantialities that art scheme carries out, within protection scope of the present invention.
Claims (9)
1. a kind of power battery pack static equilibrium control method, it is characterised in that：The balance control method includes the following steps,
Equalization step：After power battery pack is fully charged, judge whether battery pack meets default balanced entry condition, it is equal meeting
When weighing apparatus condition, the power battery monomer to be equalized to meeting balanced entry condition starts equilibrium, by the monomer with high voltage
Part electricity is consumed by equalizing resistance, is allowed to be consistent with the average voltage of entire power battery pack；
Mend electric step：After all power battery monomer voltages to be equalized and average monomer voltage are consistent, balanced return is disconnected
Trickle charge electrical circuit is opened on road, is carried out low current charge to power battery pack using Vehicular charger or charging pile, is filled until reaching
Electric cut-off condition；
Equilibrium stops judgment step：Judge that power battery pack reaches balanced suspension condition, if so, equilibrium terminates, if it is not, returning equal
Weigh step, judges whether to meet default equilibrium condition.
2. a kind of power battery pack static equilibrium control method as described in claim 1, it is characterised in that：The balanced startup
Condition includes：
(1) whether fully charged rear time of repose reaches preset value；
(2) during fully charged standing, whether the minimum monomer voltage of power battery pack reaches preset value；
(3) during fully charged standing, whether power battery pack maximum differential pressure reaches preset value under current state；
(4) during fully charged standing, whether power battery pack distance last balanced interval time reaches preset value；
When meeting condition (1), (2), (3) simultaneously or meeting condition (1), (2), (4) simultaneously, judge that battery pack meets equilibrium and opens
Dynamic condition.
3. a kind of power battery pack static equilibrium control method as described in claim 1, it is characterised in that：The balanced suspension
Condition is：
(1) add up time for balance and reach preset value；
(2) in balancing procedure, maximum differential pressure controls within preset value, and minimum monomer voltage is more than preset value；
Meet either condition and judge that balanced suspension condition meets, equilibrium terminates.
4. a kind of power battery pack static equilibrium control method as described in claim 1, it is characterised in that：Mending electric step
In, battery pack low current charge refers to charging not higher than 0.05C.
5. a kind of power battery pack static equilibrium control method as described in claim 1, it is characterised in that：Power electric to be equalized
The judgment method of pond monomer is：
During standing after power battery pack is fully charged, it is average single that each monomer voltage of power battery pack, battery pack are monitored always
Bulk voltage, battery pack stagnation pressure；It is true higher than the battery cell of average monomer voltage when power battery pack meets balanced entry condition
It is set to power battery monomer to be equalized.
6. a kind of power battery pack static equilibrium control method as described in claim 1, it is characterised in that：Treat uniform power
When battery cell starts balanced, in power battery monomer to be equalized, the corresponding battery cell of highest monomer voltage is chosen successively
It carries out balanced.
7. a kind of power battery pack static equilibrium control method as described in claim 1, it is characterised in that：The equilibrium circuit
It refer to the circuit of stroke in parallel between equalizing resistance and battery cell to be equalized；The trickle charge electrical circuit refers to Vehicular charger
Or the charge circuit of charging pile and the connection of the positive and negative anodes of power battery pack and formation.
8. a kind of power battery pack static equilibrium control method as claimed in claim 2, it is characterised in that：It is stood after fully charged
Time preset value is 10min~30min；The last balanced interval time preset value of power battery pack distance is 500h~1000h.
9. a kind of power battery pack static equilibrium control method as claimed in claim 3, it is characterised in that：Balanced suspension condition
In, it is no more than 5h to add up time for balance preset value.
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| CN201810218020.4A CN108321906A (en) | 2018-03-16 | 2018-03-16 | A kind of power battery pack static equilibrium control method |
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| CN201810218020.4A CN108321906A (en) | 2018-03-16 | 2018-03-16 | A kind of power battery pack static equilibrium control method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110854959A (en) * | 2019-11-22 | 2020-02-28 | 哈尔滨光宇电源股份有限公司 | Passive equalization method for battery system |
| CN110920400A (en) * | 2019-12-10 | 2020-03-27 | 江苏亨通新能源电气技术有限公司 | Battery system consistency fault diagnosis and whole vehicle processing method for pure electric vehicle |
| CN111864844A (en) * | 2020-07-27 | 2020-10-30 | 中航锂电（洛阳）有限公司 | Equalization method and equalization device of battery system and intelligent equipment |
| CN114069749A (en) * | 2020-08-07 | 2022-02-18 | 明创能源股份有限公司 | Rechargeable battery system with multiple-stage battery core and alternative power supply device |
| CN114643899A (en) * | 2020-12-21 | 2022-06-21 | 宝能汽车集团有限公司 | Balancing method of power battery pack and battery management system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114069749A (en) * | 2020-08-07 | 2022-02-18 | 明创能源股份有限公司 | Rechargeable battery system with multiple-stage battery core and alternative power supply device |
| CN114643899A (en) * | 2020-12-21 | 2022-06-21 | 宝能汽车集团有限公司 | Balancing method of power battery pack and battery management system |
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Application publication date: 20180724 |