CN108964155A - Power battery equalization methods, device and vehicle - Google Patents
Power battery equalization methods, device and vehicle Download PDFInfo
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- CN108964155A CN108964155A CN201710349754.1A CN201710349754A CN108964155A CN 108964155 A CN108964155 A CN 108964155A CN 201710349754 A CN201710349754 A CN 201710349754A CN 108964155 A CN108964155 A CN 108964155A
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- Prior art keywords
- battery
- charge
- balancing
- state
- battery cell
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000005611 electricity Effects 0.000 claims abstract description 41
- 238000007599 discharging Methods 0.000 claims abstract description 13
- 239000000178 monomer Substances 0.000 claims description 14
- 238000005303 weighing Methods 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims 1
- 230000006378 damage Effects 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 5
- 240000002853 Nelumbo nucifera Species 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 2
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005779 cell damage Effects 0.000 description 1
- 208000037887 cell injury Diseases 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
Classifications
-
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
This disclosure relates to which a kind of power battery equalization methods, device and vehicle, are related to vehicular field.This method comprises: using the balancing battery for having charging/discharging function to needing battery cell to be equalized to carry out balancing energy in power battery.Thus be avoided that the damage problem of battery cell occur, and overcome in the prior art using the load resistance that is connected on battery cell carry out it is balanced caused by energy loss and can only be to the defect that the strongest battery cell of electricity discharges.
Description
Technical field
This disclosure relates to vehicular field, and in particular, to a kind of power battery equalization methods, device and vehicle.
Background technique
In the prior art, in the charge and discharge process of power battery, it is possible that state of charge is unbalanced between battery
State, and because battery need to carry out charge and discharge in a certain range, in the state that state of charge is unbalanced
Carry out the damage that battery is likely to result in when charge and discharge.Carrying out balanced method to power battery in the prior art would generally use
Each of power battery battery cell is enabled to be connected on a load resistance by a switch, then by the battery list
Body discharges, to achieve the purpose that equilibrium.Battery cell that in this way can only be excessively high to state of charge carries out equilibrium, and should
The electricity of battery cell can also be lost by load resistance.
Summary of the invention
Purpose of this disclosure is to provide a kind of power battery equalization methods, device and vehicles, can be according to the balanced electricity
The state of charge in pond makes the battery cell in power battery discharge in the case where state of charge is excessively high, also can be
It charges in the state that state of charge is too low, to protect the safety of battery cell in power battery charge and discharge process.
To achieve the goals above, the disclosure provides a kind of power battery equalization methods, this method comprises:
Using the balancing battery for having charging/discharging function to needing battery cell to be equalized to carry out energy in power battery
It is balanced.
Optionally, the utilization has the balancing battery of charging/discharging function to needing battery list to be equalized in power battery
Body carries out balancing energy, comprising:
Obtain the state of charge of the balancing battery；
State of charge according to the balancing battery is to needing battery cell to be equalized to carry out energy in power battery
It is balanced.
Optionally, the state of charge according to the balancing battery is to needing battery list to be equalized in power battery
Body carries out balancing energy, comprising:
It is less than upper limit state-of-charge secure threshold in the state of charge of the balancing battery and is greater than lower limit state-of-charge
In the case where secure threshold, by the balancing battery directly to needed in power battery battery cell to be equalized carry out charging or
Electric discharge；
In the case where the state of charge of the balancing battery is greater than the upper limit state-of-charge secure threshold, by described
Balancing battery is directly to needing the battery cell for needing to be electrically charged in battery cell to be equalized to charge, and described in the control
The state of charge of balancing battery is received after deteriorating to less than the upper limit state-of-charge secure threshold by the balancing battery
Need the electric discharge for the battery cell for needing to discharge in battery cell to be equalized；
In the case where the state of charge of the balancing battery is less than the lower limit state-of-charge secure threshold, by needing
It is directly discharged to the balancing battery by the battery cell for needing to discharge in balanced battery cell, and is controlling the balanced electricity
The state of charge in pond rises to equal to needing by the balancing battery greater than after the lower limit state-of-charge secure threshold
The battery cell for needing to be electrically charged in the battery cell of weighing apparatus charges.
Optionally, the state of charge of the control balancing battery deteriorates to less than the upper limit state-of-charge safety
Threshold value is realized by following operation:
It is discharged using resistive module the balancing battery.
Optionally, this method further include:
Change the rate of the balancing battery electric discharge by changing the resistance value of the resistive module.
Optionally, the state of charge of the control balancing battery rises to greater than the lower limit state-of-charge safety
Threshold value is realized by following at least one operation:
(1) it is located at the battery cell in preset range from state of charge in the power battery to turn to the balancing battery
Move portion of energy；And
(2) it is charged from the external power supply to charge for the power battery to the balancing battery.
The disclosure also provides a kind of power battery balancer, which includes:
Power battery balance module, for equal to being needed in power battery using the balancing battery for having charging/discharging function
The battery cell of weighing apparatus carries out balancing energy.
Optionally, the power battery balance module includes:
Acquisition submodule, for obtaining the state of charge of the balancing battery；
Balanced submodule, for the state of charge according to the balancing battery to needing electricity to be equalized in power battery
Pond monomer carries out balancing energy.
Optionally, the balanced submodule include the balancing battery, first switch, transformer, multiple second switches and
Control submodule, in which:
The first coil of the balancing battery, the first switch and the transformer is connected；
The transformer has multiple second coils, each battery cell of the power battery it is corresponding described the
Two switches and second coil series connection；
The control submodule controls the first switch and phase for the state of charge according to the balancing battery
The closure and disconnection for the second switch answered carry out balancing energy to the battery cell that need to be to be equalized.
Optionally, the balanced submodule further includes third switch and resistive module, wherein the third switchs, is described
Resistive module and the balancing battery connect and form the circuit discharged the balancing battery；And/or
The first coil of the transformer and the turn ratio of the second coil of the transformer are adjustable.
Optionally, the resistance value of the resistive module is adjustable.
Optionally, the control submodule is used for:
It is less than upper limit state-of-charge secure threshold in the state of charge of the balancing battery and is greater than lower limit state-of-charge
In the case where secure threshold, it is described equal to realize to control closure and the disconnection of the first switch and the corresponding second switch
Weighing apparatus battery is directly to needing battery cell to be equalized to carry out charge or discharge in power battery；
In the case where the state of charge of the balancing battery is greater than the upper limit state-of-charge secure threshold, pass through control
Make closure and the disconnection of the first switch and the corresponding second switch control the balancing battery directly to need by
The battery cell for needing to be electrically charged in balanced battery cell charges, and in the state of charge for controlling the balancing battery
After deteriorating to less than the upper limit state-of-charge secure threshold, the first switch and the corresponding second switch are controlled
It is closed with disconnecting and realizes that the balancing battery reception needs putting for the battery cell for needing to discharge in battery cell to be equalized
Electricity；
In the case where the state of charge of the balancing battery is less than the lower limit state-of-charge secure threshold, pass through control
The closure for making the first switch and the corresponding second switch is controlled with disconnection and is needed in need battery cell to be equalized
The battery cell to be discharged directly discharges to the balancing battery, and rises in the state of charge for controlling the balancing battery
After the lower limit state-of-charge secure threshold, control the closure of the first switch and the corresponding second switch with
It disconnects to realize that the battery cell for needing to be electrically charged in the balancing battery battery cell to be equalized to need charges.
The disclosure also provides a kind of vehicle, which includes power battery balancer recited above.
Through the above technical solutions, to be equalized to being needed in power battery using the balancing battery for having charging/discharging function
Battery cell carry out balancing energy, therefore can in power battery exist need be charged or discharged battery cell when for its
Charge or discharge are carried out, are thus avoided that the damage of battery cell, and are overcome in the prior art using being connected to battery cell
On load resistance carry out it is balanced caused by energy loss and can only be to the defect that the strongest battery cell of electricity discharges.
Other feature and advantage of the disclosure will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is and to constitute part of specification for providing further understanding of the disclosure, with following tool
Body embodiment is used to explain the disclosure together, but does not constitute the limitation to the disclosure.In the accompanying drawings:
Fig. 1 is a kind of flow chart of power battery equalization methods shown according to an exemplary embodiment.
Fig. 2 is the flow chart of another power battery equalization methods shown according to an exemplary embodiment.
Fig. 3 is the flow chart of another power battery equalization methods shown according to an exemplary embodiment.
Fig. 4 is a kind of schematic block diagram of power battery balancer shown according to an exemplary embodiment.
Fig. 5 is power battery balance module in a kind of power battery balancer shown according to an exemplary embodiment
Schematic block diagram.
Fig. 6 is the schematic block of balanced submodule in a kind of power battery balancer shown according to an exemplary embodiment
Figure.
Description of symbols
The balanced submodule of 10 acquisition submodule 20
1 balancing battery, 2 first switch
3 transformer, 4 second switch
5 control submodule, 6 third switch
7 resistive module, 8 second coil
9 first coil, 100 power battery balance module
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the disclosure.It should be understood that this place is retouched
The specific embodiment stated is only used for describing and explaining the disclosure, is not limited to the disclosure.
The disclosure inventors have found that will appear in the charge and discharge process of power battery, between battery cell electricity unevenness
The case where weighing apparatus, if not doing electric quantity balancing, will cause battery cell overcharge or over-discharge, cause cell damage.For example, filling
In electric process, easily there is a situation where the state of charge for the battery cell having is excessively high, if continuing to charge, it will cause this
Battery cell overcharges, and if stopping charging, it will cause the situations that other battery cells are not fully filled electricity, just need this when
Balanced discharge is carried out to the strongest battery cell of the electricity.For another example during discharge, the lotus for the battery cell easily having
The too low situation of electricity condition value, if continuing to discharge, it will cause the over-discharges of the battery cell, and if stopping electric discharge,
It will cause other battery cells electricity, and then wastes energy, reduces the course continuation mileage of the vehicle using power battery, therefore this
When a, it is necessary to carry out equalizaing charge to the most weak battery cell.
If it is possible to use one piece of battery as balancing battery, charge and discharge actively is carried out to unbalanced battery cell
Electricity, such as the battery cell for keeping state of charge high charge to balancing battery, make the battery that balancing battery is low to state of charge
Monomer charging, then the electric quantity balancing purpose between battery cell can be reached, to can either avoid during the charging process
Cause the situation for being not fully filled electricity to occur since the state of charge of Individual cells monomer is excessively high, and can be avoided in discharge process
In since the state of charge of Individual cells monomer is too low influence vehicle course continuation mileage, and power battery can also be protected,
Overcome in the prior art using the load resistance that is connected on battery cell carry out it is balanced caused by energy loss and can only be right
The defect that the strongest battery cell of electricity discharges.
Below to being described in detail in accordance with an embodiment of the present disclosure.
Fig. 1 is a kind of flow chart of power battery equalization methods shown according to an exemplary embodiment.As shown in Figure 1,
The method includes the steps S101.
In step s101, using the balancing battery for having charging/discharging function to needing battery to be equalized in power battery
Monomer carries out balancing energy.
Through the above technical solutions, having the balancing battery of charging/discharging function described in carry out to the power battery
Equalization operation, therefore can exist in power battery and need to be charged or put for it when the battery cell being charged or discharged
Electricity, be thus avoided that battery cell in power battery due to state of charge it is unbalanced caused by damage, and overcome existing
Have in technology using the load resistance that is connected on battery cell carry out it is balanced caused by energy loss and can only be to electricity most
The defect that strong battery cell discharges.
Fig. 2 is a kind of flow chart of power battery equalization methods shown according to an exemplary embodiment.As shown in Fig. 2,
The method includes the steps S201 and step S202.
In step s 201, the state of charge of the balancing battery is obtained.
The state of charge of the balancing battery can be obtained by electric power detection equipment, such as battery management system
Deng.
In step S202, state of charge according to the balancing battery is to needing battery to be equalized in power battery
Monomer carries out balancing energy.
After the state of charge for obtaining the balancing battery, difference locating for the state of charge for balancing battery
Section is come to needing battery cell to be equalized to carry out balancing energy in power battery.For example, working as the state-of-charge of balancing battery
When being worth too low, then it can not charge for the battery cell for needing to charge in power battery, when the state-of-charge of balancing battery
When being worth excessively high, then it can not discharge etc. for the battery cell for needing to discharge in power battery.
Through the above technical solutions, the state of charge of the balancing battery is obtained first, then according to the balanced electricity
For the state of charge in pond to needing battery cell to be equalized to carry out balancing energy in power battery, this makes it possible to ensure
Weigh battery state of charge in allowed limits when to needed in power battery battery cell to be equalized carry out charging or
The operation of electric discharge to avoid the damage of battery cell or balancing battery, and overcomes in the prior art using being connected to battery list
Load resistance on body carries out energy loss caused by equilibrium and what can only be discharged the strongest battery cell of electricity lacks
It falls into.
A kind of state of charge pair in possible embodiment, described in step S202 according to the balancing battery
It needs battery cell to be equalized to carry out balancing energy in power battery, may include:
(1) it is less than upper limit state-of-charge secure threshold in the state of charge of the balancing battery and is greater than the charged shape of lower limit
In the case where state secure threshold, by the balancing battery directly to needing battery cell to be equalized to charge in power battery
Or electric discharge；
(2) in the case where the state of charge of the balancing battery is greater than the upper limit state-of-charge secure threshold, by
The battery cell for needing to be electrically charged in balancing battery battery cell directly to be equalized to need charges, and is controlling
The state of charge of the balancing battery deteriorates to less than the upper limit state-of-charge secure threshold later by the balancing battery
Receive the electric discharge for needing the battery cell for needing to discharge in battery cell to be equalized；
(3) in the case where the state of charge of the balancing battery is less than the lower limit state-of-charge secure threshold, by
The battery cell for needing to discharge in battery cell to be equalized is needed directly to discharge to the balancing battery, and described equal controlling
The state of charge of weighing apparatus battery rises to greater than the lower limit state-of-charge secure threshold later by the balancing battery to needs
It is charged by the battery cell for needing to be electrically charged in balanced battery cell.
Wherein, upper limit state-of-charge secure threshold described here and lower limit state-of-charge secure threshold can be according to reality
Situation is arranged, and the disclosure is not limited this.
By considering the state of charge of balancing battery when carrying out balancing energy to the battery cell in power battery, both
Can be realized the balancing energy of battery cell in power battery, and balancing battery can be protected, avoid balancing battery overcharge or
Over-discharge.For example, if the state of charge of balancing battery is greater than upper limit state-of-charge secure threshold and needs battery to be equalized
Monomer is all the battery cell for needing to discharge, then balancing battery will not directly receive the electric discharge for needing the battery cell to discharge, and
It is that can carry out discharging and just holding after the state of charge of balancing battery becomes less than upper limit state-of-charge secure threshold first
Begin to receive the electric discharge for needing the battery cell to discharge, this makes it possible to avoid overcharging for balancing battery.For another example if balanced electricity
It is the electricity for needing to charge that the state of charge in pond, which is less than lower limit state-of-charge secure threshold and needs battery cell to be equalized all,
Pond monomer, then the charging for the battery cell that balancing battery will not directly charge to needs, but energy can be supplemented first and equal
The state of charge of weighing apparatus battery just starts the battery cell to charge to needs after becoming greater than lower limit state-of-charge secure threshold
It charges, this makes it possible to the over-discharges for avoiding balancing battery.
Fig. 3 is the flow chart of another power battery equalization methods shown according to an exemplary embodiment.As shown in figure 3,
It further include step S301 to step S316 other than including step S201 shown in Fig. 2.
In step S301, judge whether the state of charge of balancing battery is greater than upper limit state-of-charge secure threshold, such as
Fruit is then to go to step S302, if it is not, then going to step S303.
In step s 302, judge in battery cell it is whether in need by balanced battery cell, if it is, going to step
Rapid S305, if it is not, then going to step S304.
In step s 304, the state of charge for controlling balancing battery is decreased to less than upper limit state-of-charge secure threshold, with
Protect balancing battery.
In step S305, judge to need in battery cell to be equalized whether not only the battery cell in need being electrically charged but also
The battery cell of electric discharge in need, if it is, step S307 is gone to, if it is not, then going to step S306.
In step S307, by the electricity for needing to be electrically charged in balancing battery battery cell directly to be equalized to need
Pond monomer charges, and deteriorates to less than the upper limit state-of-charge safety in the state of charge for controlling the balancing battery
The electric discharge for needing the battery cell for needing to discharge in battery cell to be equalized is received after threshold value by the balancing battery.
In step S306, the whether only battery cell in need being electrically charged is judged to need in battery cell to be equalized,
If it is, step S308 is gone to, if it is not, then going to step S309.
In step S308, by the electricity for needing to be electrically charged in balancing battery battery cell directly to be equalized to need
Pond monomer charges.
In step S309, the upper limit state-of-charge is deteriorated to less than in the state of charge for controlling the balancing battery
The electric discharge for needing the battery cell for needing to discharge in battery cell to be equalized is received after secure threshold by the balancing battery,
Because needing in battery cell to be equalized the only battery cell in need being discharged at this time.
In step S303, judge whether the state of charge of balancing battery is less than lower limit state-of-charge secure threshold, such as
Fruit is then to go to step S311, if it is not, then going to step S310.
In step s310, by the balancing battery directly to needing battery cell to be equalized to fill in power battery
Electricity or electric discharge, because the state of charge of balancing battery is located at lower limit state-of-charge secure threshold at this time and upper limit state-of-charge is pacified
Between full threshold value.
In step S311, since the state of charge of balancing battery at this time is less than lower limit state-of-charge secure threshold, institute
It is whether in need by balanced battery cell in battery cell to need first to judge.If so, step S312 is then gone to, if
Nothing can not then take the state of charge of any operation or control balancing battery to rise to greater than lower limit state-of-charge safety
Threshold value.
In step S312, judge to need in battery cell to be equalized whether not only the battery cell in need being electrically charged but also
The battery cell of electric discharge in need, if it is, step S313 is gone to, if it is not, then going to step S314.
In step S313, from needing the battery cell for needing to discharge in battery cell to be equalized directly to the equilibrium
Battery discharge, and the state of charge for controlling the balancing battery rise to greater than the lower limit state-of-charge secure threshold it
It is charged afterwards by the battery cell for needing to be electrically charged in the balancing battery battery cell to be equalized to need.
In step S314, the whether only battery cell in need being electrically charged is judged to need in battery cell to be equalized,
If it is, step S315 is gone to, if it is not, then going to step 316.
In step S315, due to needing in battery cell to be equalized the only battery cell in need being electrically charged, so
Need after the state of charge for controlling the balancing battery rises to greater than the lower limit state-of-charge secure threshold by
The battery cell for needing to be electrically charged in the balancing battery battery cell to be equalized to need charges.
In step S316, the only battery cell of electric discharge in need is needed in battery cell to be equalized, it is possible to straight
It connects from needing the battery cell for needing to discharge in battery cell to be equalized directly to discharge to the balancing battery.
Above-mentioned steps be according to balancing battery state of charge to needed in power battery battery cell to be equalized into
The balanced executive mode of row balancing energy.It, can when the state of charge of balancing battery is greater than upper limit state-of-charge secure threshold
To execute the equalization operation to need the battery cell to charge to charge, but need to drop in the state of charge of balancing battery
To less than the equalization operation that just can be carried out after upper limit state-of-charge secure threshold as the battery cell electric discharge for needing to discharge.Work as equilibrium
In the case that the state of charge of battery is less than lower limit state-of-charge secure threshold, it can execute to need the battery cell to discharge
The equalization operation discharged, but need to rise in the state of charge of balancing battery greater than lower limit state-of-charge safety threshold
It could be the equalization operation for needing the battery cell to charge to charge after value.It is less than in the state of charge of balancing battery upper
Limit load electricity condition secure threshold and be greater than lower limit state-of-charge secure threshold in the case where, can directly execute from balancing battery to
It needs the battery cell for needing to be electrically charged in battery cell to be equalized to charge and receives to need to need in battery cell to be equalized
The electric discharge for the battery cell to be discharged.To exist concurrently with the battery cell for needing the battery cell to discharge and needs to charge
When, balancing battery can be in the case where ensureing that the state of charge of itself is in zone of reasonableness, while realizing and needing to discharge
Battery cell electric discharge and the charging of battery cell charged of needs.
Therefore, by technical solution shown in Fig. 3, one kind is given specifically according to the state of charge pair of balancing battery
It needs battery cell to be equalized to carry out the execution method of balancing energy in power battery, has further ensured in balancing battery
Charge state value in safe range when just can be balanced to needing balanced battery cell to carry out in power battery, and can either
It realizes the charging for needing the battery cell to charge, and can be realized the electric discharge for needing the battery cell to discharge, overcome existing skill
In art using the load resistance that is connected on battery cell carry out it is balanced caused by energy loss and can only be strongest to electricity
The defect that battery cell discharges.
In a kind of possible embodiment, the state of charge of balancing battery deteriorates to less than upper limit state-of-charge safety
Threshold value can be realized by following operation: be discharged using resistive module balancing battery.Wherein, resistive module can be
The resistance of single fixed resistance value, is also possible to the resistance of the fixed resistance value of multiple parallel connections, the resistance of this multiple parallel connection can pass through
Switch is successively strobed to change the resistance value for the resistive module discharged balancing battery, can also be variable resistance.By by institute
Resistive module and the concatenated mode of balancing battery are stated, i.e., is discharged using resistive module balancing battery, it thus can be
The state of charge of balancing battery in time drops the state of charge of balancing battery when being greater than upper limit state-of-charge secure threshold
Supreme limit load electricity condition secure threshold is hereinafter, to protect balancing battery, but also balancing battery can have in power battery to be needed
The equalization operation discharged in time it when the battery cell to be discharged.
In a kind of possible embodiment, this method further include: changed by changing the resistance value of the resistive module
Become the rate of the balancing battery electric discharge.
If the resistive module is the resistance of the fixed resistance value of multiple parallel connections, can connect a switch for each resistance
To adjust the resistance value of resistive module by switching on-off, if the resistive module is variable resistance, can directly lead to
The resistance value of variable resistance is overregulated to change the resistance value of resistive module, thus to change the rate of balancing battery electric discharge.Electricity
The resistance value for hindering module is higher, and the discharge rate of balancing battery is faster.
In addition, the resistance value of resistive module can be adjusted according to the actual situation.For example, in the charged of balancing battery
In the case where battery cell of the state value greater than electric discharge in need in upper limit state-of-charge secure threshold and battery cell, need
The state of charge of weighing apparatus battery is down to upper limit state-of-charge secure threshold hereinafter, at this time then can be by the electricity of resistive module as soon as possible
Resistance value is turned up, to achieve the purpose that repid discharge；Conversely, can then be incited somebody to action when not needing to carry out repid discharge to balancing battery
The resistance value of resistive module is adjusted to normal value, and the electric discharge of normal speed is carried out to balancing battery.
Through the above technical solutions, the speed of balancing battery electric discharge can be changed by changing the resistance value of resistive module
Rate can thus be reached in the case where needing to carry out repid discharge to balancing battery by increasing the resistance value of resistive module
The purpose of repid discharge is carried out to balancing battery, and then is conducive to the electric discharge for the battery cell for rapidly realizing that needs discharge.
In a kind of possible embodiment, the state of charge of balancing battery is risen to greater than lower limit state-of-charge safety
Threshold value can be realized by following at least one operation:
(1) battery cell in preset range is located to the balancing battery transfer portion from state of charge in power battery
Divide energy.
It is filled in the state of charge of balancing battery lower than there are needs in lower limit state-of-charge secure threshold and power battery
When the battery cell of electricity, the state of charge of balancing battery needs to rise to as early as possible greater than lower limit state-of-charge secure threshold, this
When can use in power battery without carrying out battery cell that balanced and state of charge is located in preset range to balanced electric
Pond transfer part energy, to be reached for the purpose of the battery cell for needing to need to charge in battery cell to be equalized charging.Institute
The safe range that preset range refers to the state of charge of battery cell is stated, can be configured according to the actual situation, this public affairs
It opens without limitation.If single battery monomer can not rise to the state of charge of balancing battery greater than lower limit state-of-charge
Secure threshold can be then that balancing battery shifts energy by multiple battery cells for meeting above-mentioned condition, until balancing battery
State of charge rise to greater than lower limit state-of-charge secure threshold.
(2) it is charged from the external power supply to charge for the power battery to the balancing battery.
For example, there is the balanced electricity in the external power supply during being charged for the power battery
The state of charge in pond be less than the lower limit state-of-charge secure threshold the case where, at this time can using the external power supply come
It is charged for the balancing battery so that the state of charge of the balancing battery rises to greater than the lower limit state-of-charge safety
Threshold value.
Therefore, by using state of charge be located at battery cell in preset range or for power battery charging outside
It connects power supply and to balancing battery transfer part energy the state of charge of balancing battery is risen to as early as possible greater than the charged shape of lower limit
State secure threshold, with the equalization operation to charge to the battery cell for needing to charge in power battery, this makes it possible into one
Step ensures that balancing battery can occur needing in power battery carrying out charge balancing to it in time when the battery cell to charge
Operation.
Fig. 4 is a kind of schematic block diagram of power battery balancer shown according to an exemplary embodiment.Such as Fig. 4 institute
Show, includes power battery balance module 100 in described device.
The power battery balance module 100, for utilizing the balancing battery for having charging/discharging function in power battery
Battery cell to be equalized is needed to carry out balancing energy.
Through the above technical solutions, utilizing the equilibrium for having charging/discharging function by the power battery balance module 100
Battery to carry out the power battery equalization operation, therefore can exist in the power battery and need to be charged or discharged
Battery cell when for its carry out charge or discharge, be thus avoided that the battery cell in power battery due to state of charge
Damage caused by unbalanced, and overcome and carry out equilibrium using the load resistance that is connected on battery cell in the prior art and cause
Energy loss and can only be to the defect that the strongest battery cell of electricity discharges.
Fig. 5 is power battery balance module in a kind of power battery balancer shown according to an exemplary embodiment
100 schematic block diagram.As shown in figure 5, including acquisition submodule 10 and balanced submodule in the power battery balance module 100
20.The acquisition submodule 10 is used to obtain the state of charge of the balancing battery.The equilibrium submodule 20 is used for according to described in
The state of charge of balancing battery carries out balancing energy to needing battery cell to be equalized in power battery.
Through the above technical solutions, the state of charge of the balancing battery is obtained by the acquisition submodule 10 first,
Then by the balanced submodule 20 according to the balancing battery state of charge to needing electricity to be equalized in power battery
Pond monomer carry out balancing energy, this makes it possible to ensure balancing battery state of charge in allowed limits when to power
Battery cell to be equalized is needed to carry out the operation of charge or discharge in battery, to avoid the damage of battery cell or balancing battery
It is bad, and overcome in the prior art using the load resistance that is connected on battery cell carry out it is balanced caused by energy loss and
It can only be to the defect that the strongest battery cell of electricity discharges.
Fig. 6 is the signal of balanced submodule 20 in a kind of power battery balancer shown according to an exemplary embodiment
Block diagram.As shown in fig. 6, the equilibrium submodule 20 is opened including the balancing battery 1, first switch 2, transformer 3, multiple second
Close 4 and control submodule 5, in which:
The first coil 9 of the balancing battery 1, the first switch 2 and the transformer 3 is connected；
The transformer 3 has multiple second coils 8, corresponding described of each battery cell of the power battery
Second switch 4 and second coil 8 series connection；
The control submodule 5 controls the first switch 2 for the state of charge according to the balancing battery 1
With the closure and disconnection of the corresponding second switch 4, balancing energy is carried out to the battery cell that need to be to be equalized.
Wherein, in disorder in order to avoid attached drawing, in Fig. 6, schematically show only control submodule 5 and one of them
The connection relationship of second switch 4, but actually control submodule 5 and each second switch 4 connects, to control each second
The disconnection and closure of switch 4.
In a kind of possible embodiment, the control submodule 5, for performing the following operations:
(1) less than upper limit state-of-charge secure threshold and charged greater than lower limit in the state of charge of the balancing battery 1
In the case where status safety threshold value, the closure for controlling the first switch 2 and the corresponding second switch 4 is realized with disconnection
The balancing battery 1 is directly to needing battery cell to be equalized to carry out charge or discharge in power battery；
(2) in the case where the state of charge of the balancing battery 1 is greater than upper limit state-of-charge secure threshold, pass through control
Closure and the disconnection of the first switch 2 and the corresponding second switch 4 are made to control the balancing battery 1 directly to needs
It is charged by the battery cell for needing to be electrically charged in balanced battery cell, and in the charged shape for controlling the balancing battery 1
After state value deteriorates to less than the upper limit state-of-charge secure threshold, the first switch 2 and corresponding described second are controlled
The closure of switch 4 realizes that the balancing battery 1 receives the battery for needing to need to discharge in battery cell to be equalized with disconnection
The electric discharge of monomer；
(3) in the case where the state of charge of the balancing battery 1 is less than lower limit state-of-charge secure threshold, pass through control
The closure and disconnection for making the first switch 2 and the corresponding second switch 4 need in battery cell to be equalized to control
The battery cell for needing to discharge directly discharges to the balancing battery 1, and in the state of charge for controlling the balancing battery 1
It rises to and is greater than after the lower limit state-of-charge secure threshold, control the first switch 2 and the corresponding second switch 4
Closure realizes that the battery cell for needing to be electrically charged in 1 pair of need of balancing battery battery cell to be equalized is carried out with disconnecting
Charging.
It is opened through the above technical solutions, giving the control submodule 5 and controlling the first switch 2 and corresponding second
4 operation is closed, so as to right in the case where the state of charge of the balancing battery 1 is greater than upper limit state-of-charge secure threshold
It needs balanced battery cell to carry out charge or discharge in the power battery, can thus ensure the balancing battery 1 in lotus
The battery cell in the power battery can also be carried out in the case where ensureing inherently safe in the case that electricity condition value is excessively high
Balancing energy.It can also be in the case where the state of charge of the balancing battery 1 be less than lower limit state-of-charge secure threshold to institute
It states and balanced battery cell is needed to carry out charge or discharge in power battery, can thus ensure the balancing battery 1 charged
Also energy can be carried out to the battery cell in the power battery in the case where ensureing inherently safe in the case that state value is too low
Amount is balanced.
In a kind of possible embodiment, as shown in fig. 6, the equilibrium submodule 20 further includes third switch 6 and electricity
Hinder module 7.Wherein, the third switch 6, the resistive module 7 and the balancing battery 1 are connected and are formed to the balanced electricity
The circuit that pond 1 is discharged.In this way, it is possible to be discharged using resistive module 7 balancing battery 1, so as in balancing battery 1
State of charge be greater than the upper limit state-of-charge secure threshold when state of charge of balancing battery 1 is down to upper limit load in time
Electricity condition secure threshold hereinafter, to protect balancing battery 1, and then can in power battery the battery cell in need being discharged
When the equalization operation discharged in time it by balancing battery 1.
In a kind of possible embodiment, the resistance value of the resistive module 7 is adjustable.In this manner it is possible to logical
The resistance value of change resistive module 7 is crossed to change the rate of the electric discharge of balancing battery 1, so as to need to carry out balancing battery 1
Achieve the purpose that carry out repid discharge to balancing battery 1 by increasing the resistance value of resistive module 7 in the case where repid discharge.
In addition, the first coil 9 of transformer 3 and the turn ratio of the second coil 8 of transformer 3 are adjustable.In this way, logical
Cross the turn ratio of the second coil 8 of the first coil 9 and transformer 3 that change transformer 3, thus it is possible to vary balancing battery 1 and needs
By the energy transfer direction between balanced battery cell.For example, the state of charge of balancing battery 1 is to be equalized lower than needing
The state of charge of battery cell but need balancing battery 1 to when needing the balanced battery cell to be charged, it can be by changing
Become the turn ratio of second coil 8 corresponding with the battery cell balanced with needs of transformer 3 of first coil 9 of transformer 3
To complete.
In addition, switching on-off in the on-off of third switch 6, resistive module 7 and the turn ratio of transformer 3 change
Become, may be by control submodule 5 to control.
In addition, according to modules in the device of the embodiment of the present disclosure and its specific implementation of performed operation
Through being described in detail in the method according to the embodiment of the present disclosure in conjunction with attached drawing 1-3, details are not described herein again.
The disclosure also provides a kind of vehicle, which includes above-mentioned power battery balancer.
The preferred embodiment of the disclosure is described in detail in conjunction with attached drawing above, still, the disclosure is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the disclosure, a variety of letters can be carried out to the technical solution of the disclosure
Monotropic type, these simple variants belong to the protection scope of the disclosure.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the disclosure to it is various can
No further explanation will be given for the combination of energy.
In addition, any combination can also be carried out between a variety of different embodiments of the disclosure, as long as it is without prejudice to originally
Disclosed thought equally should be considered as disclosure disclosure of that.
Claims (13)
1. a kind of power battery equalization methods, which is characterized in that this method comprises:
Using the balancing battery for having charging/discharging function to needing battery cell to be equalized to carry out balancing energy in power battery.
2. the method according to claim 1, wherein the utilization has the balancing battery of charging/discharging function to dynamic
Battery cell to be equalized is needed to carry out balancing energy in power battery, comprising:
Obtain the state of charge of the balancing battery；
State of charge according to the balancing battery is to needing battery cell to be equalized to carry out balancing energy in power battery.
3. according to the method described in claim 2, it is characterized in that, the state of charge according to the balancing battery is to dynamic
Battery cell to be equalized is needed to carry out balancing energy in power battery, comprising:
It is less than upper limit state-of-charge secure threshold in the state of charge of the balancing battery and is greater than lower limit state-of-charge safety
In the case where threshold value, by the balancing battery directly to needing battery cell to be equalized to be charged or put in power battery
Electricity；
In the case where the state of charge of the balancing battery is greater than the upper limit state-of-charge secure threshold, by the equilibrium
The battery cell for needing to be electrically charged in battery battery cell directly to be equalized to need charges, and is controlling the equilibrium
The state of charge of battery deteriorates to less than the upper limit state-of-charge secure threshold and receives needs by the balancing battery later
The electric discharge for the battery cell for being needed to discharge in balanced battery cell；
It is equal by needing in the case where the state of charge of the balancing battery is less than the lower limit state-of-charge secure threshold
The battery cell for needing to discharge in the battery cell of weighing apparatus directly discharges to the balancing battery, and is controlling the balancing battery
State of charge rises to be equalized to needing by the balancing battery greater than after the lower limit state-of-charge secure threshold
The battery cell for needing to be electrically charged in battery cell charges.
4. according to the method described in claim 3, it is characterized in that, the state of charge decline of the control balancing battery
To less than the upper limit state-of-charge secure threshold is realized by following operation:
It is discharged using resistive module the balancing battery.
5. according to the method described in claim 4, it is characterized in that, this method further include:
Change the rate of the balancing battery electric discharge by changing the resistance value of the resistive module.
6. according to the method described in claim 3, it is characterized in that, the state of charge of the control balancing battery rises
To more than the lower limit state-of-charge secure threshold is realized by following at least one operation:
(1) battery cell in preset range is located to the balancing battery transfer portion from state of charge in the power battery
Divide energy；And
(2) it is charged from the external power supply to charge for the power battery to the balancing battery.
7. a kind of power battery balancer, which is characterized in that the device includes:
Power battery balance module (100), for using have the balancing battery of charging/discharging function to needed in power battery by
Balanced battery cell carries out balancing energy.
8. device according to claim 7, which is characterized in that the power battery balance module (100) includes:
Acquisition submodule (10), for obtaining the state of charge of the balancing battery；
Balanced submodule (20), for the state of charge according to the balancing battery to needing electricity to be equalized in power battery
Pond monomer carries out balancing energy.
9. device according to claim 8, which is characterized in that the equilibrium submodule (20) includes the balancing battery
(1), first switch (2), transformer (3), multiple second switches (4) and control submodule (5), in which:
The first coil (9) of the balancing battery (1), the first switch (2) and the transformer (3) is connected；
The transformer (3) has multiple second coils (8), corresponding described of each battery cell of the power battery
Second switch (4) and second coil (8) series connection；
The control submodule (5) controls the first switch for the state of charge according to the balancing battery (1)
(2) and the closure and disconnection of the corresponding second switch (4), the battery cell progress energy to be equalized to the need are equal
Weighing apparatus.
10. device according to claim 9, which is characterized in that the equilibrium submodule (20) further includes third switch (6)
With resistive module (7), wherein the third switch (6), the resistive module (7) and the balancing battery (1) are connected and formed
To the circuit of the balancing battery (1) electric discharge；And/or
The turn ratio of the second coil (8) of the first coil (9) and the transformer (3) of the transformer (3) is adjustable.
11. device according to claim 10, which is characterized in that the resistance value of the resistive module (7) is adjustable.
12. the device according to any claim in claim 9 to 11, which is characterized in that the control submodule (5)
For:
It is less than upper limit state-of-charge secure threshold in the state of charge of the balancing battery (1) and is greater than lower limit state-of-charge and pacifies
The closure for controlling the first switch (2) and the corresponding second switch (4) in the case where full threshold value and disconnection are to realize
Balancing battery (1) is stated directly to needing battery cell to be equalized to carry out charge or discharge in power battery；
In the case where the state of charge of the balancing battery (1) is greater than the upper limit state-of-charge secure threshold, pass through control
Closure and the disconnection for making the first switch (2) and the corresponding second switch (4) are direct to control the balancing battery (1)
The battery cell for needing to be electrically charged in the battery cell to be equalized to need charges, and is controlling the balancing battery (1)
State of charge deteriorate to less than the upper limit state-of-charge secure threshold after, control the first switch (2) and corresponding
The second switch (4) closure and disconnection needed in battery cell to be equalized to realize that the balancing battery (1) receives
The electric discharge for the battery cell for needing to discharge；
In the case where the state of charge of the balancing battery (1) is less than the lower limit state-of-charge secure threshold, pass through control
Making the first switch (2) and the accordingly closure of the second switch (4) and disconnection needs battery list to be equalized to control
The battery cell for needing to discharge in body directly discharges to the balancing battery (1), and is controlling the charged of the balancing battery (1)
State value rises to greater than after the lower limit state-of-charge secure threshold, controlling the first switch (2) and corresponding described
The closure of second switch (4) is realized with disconnection to need to be filled in the balancing battery (1) battery cell to be equalized to need
The battery cell of electricity charges.
13. a kind of vehicle, which is characterized in that the vehicle includes moving according to any claim in claim 7 to 12
Power battery balanced device.
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| CN108964155B (en) | 2020-12-15 |
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Denomination of invention: Power battery equalization method, device and vehicle Effective date of registration: 20211213 Granted publication date: 20201215 Pledgee: BEIJING AUTOMOTIVE GROUP Co.,Ltd. Pledgor: Borgward Automotive (China) Co., Ltd. Registration number: Y2021990001167 |
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Date of cancellation: 20231201 Granted publication date: 20201215 Pledgee: BEIJING AUTOMOTIVE GROUP Co.,Ltd. Pledgor: Beijing baowo Automobile Co.,Ltd.|Borgward Automotive (China) Co., Ltd. Registration number: Y2021990001167 |