CN106786909B - A kind of equalising control device in groups and control method of energy storage liquid metal cell - Google Patents
A kind of equalising control device in groups and control method of energy storage liquid metal cell Download PDFInfo
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- CN106786909B CN106786909B CN201611228338.8A CN201611228338A CN106786909B CN 106786909 B CN106786909 B CN 106786909B CN 201611228338 A CN201611228338 A CN 201611228338A CN 106786909 B CN106786909 B CN 106786909B
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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
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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
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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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
- 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
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Abstract
The invention belongs to electrochemical energy storage fields, more particularly to the equalising control device in groups and control method of a kind of energy storage liquid metal cell, the equalising control device in groups of the energy storage liquid metal cell, including N number of concatenated liquid metal cell unit, voltage detection module, equalization control module, equalizing circuit module, screening the higher several sections of liquid metal cell monomers of consistency by first go here and there again and in the way of form a battery unit, be placed in the same high temperature dwell incubator.The invention also discloses a kind of energy storage liquid metal cell grouping charging and discharging balance control methods.Control device and control method of the invention, be able to solve liquid metal cell voltage platform it is low and wide and be difficult to carry out active equalization control defect, and cope with hot environment locating when liquid metal cell uses in groups, the complexity of equalising control device and control method is reduced, to meet the energy storage use demand for liquid metal cell.
Description
Technical field
The invention belongs to electrochemical energy storage fields, and in particular to a kind of dress of Balance route in groups of energy storage liquid metal cell
It sets and control method, it is low and wide and be difficult to carry out lacking for active equalization control to be able to solve liquid metal cell voltage platform
It falls into, and the hot environment that reply liquid metal cell is locating when using in groups, reduces equalising control device and control method
Complexity.
Background technique
Energy storage technology is negative in stability, the smooth user side of the raising renewable energy systems such as wind energy and solar energy
Lotus, the safety and stability for improving electric system etc. play the role of very important.Electrochemical energy storage is by flexibly side
Just, important directions high-efficient, maintenance cost is low and as energy storage technology development.But existing electrochemical energy storage technology all because
Security feature is bad and energy storage higher cost and is unable to satisfy the requirement of large-scale energy storage system, and liquid metal cell is exactly coped with
This challenge and the model electrochemical energy storage technology to grow up.Liquid metal cell operating temperature at 300 DEG C~700 DEG C, because
It is designed with special electrode material and structure, performance is stablized, and lasts a long time.
In order to meet requirement of the energy-storage system to voltage and power, it is necessary to liquid metal cell is used in groups in series and parallel,
But in actual moving process, performance of the single battery due to differences such as manufacturing process, use environment, aging speeds, between battery
Difference can also increase increasingly, because of the presence of wooden pail effect, the capacity utilization and service life of battery pack will be substantially reduced, because
This must take liquid metal cell group corresponding Balance route measure.
Liquid metal cell has the characteristics that large capacity, low-voltage, and operates in hot environment, needs to save when using in groups
In high temperature dwell incubator.The domestic Balance route to liquid metal cell studies relatively fewer, Chinese invention patent explanation at present
Book CN104682511A is proposed to the method for completely filling liquid metal cell progress high current energy consumption balance, this method energy balance
Greatly, energy dissipation and a large amount of heat production problems are caused, and successively to wait all batteries to reach fully charged state, balancing speed is slow.
Chinese invention patent specification CN105141004A proposes to carry out the battery for reaching trimming threshold using the non-linear electric group of high temperature
The method of energy consumption balance, although this method balancing speed is fast, control is simple, due in charge and discharge end, liquid metal cell
Voltage change is very fast, and the electric current flowed through in nonlinear resistance is also very big, causes largely loss and heat production.And both are passive balanced
Method does not all account for, and liquid metal cell should be reduced as far as high temperature in groups in use, need to be placed in high temperature dwell incubator
Incubator to outer lead.
Since there are drawbacks described above and deficiency, this field needs to make and further improve, designs one kind and be directed to
The equalising control device and control method of liquid metal cell, can solve liquid metal cell voltage platform it is low and wide and
It is difficult to carry out the defect of active equalization control, and copes with hot environment locating when liquid metal cell uses in groups, is reduced
The complexity of equalising control device and control method, to meet the use demand for liquid energy storage metal battery.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of energy storage liquid metal cell at
Group equalising control device and control method, the equalising control device include N number of concatenated liquid metal cell unit, voltage detecting
It is low and wide and be difficult to carry out to be able to solve liquid metal cell voltage platform for module, equalization control module, equalizing circuit module
The defect of active equalization control, and hot environment locating when liquid metal cell uses in groups is coped with, reduce Balance route
The complexity of device and control method.
To achieve the above object, according to one aspect of the present invention, a kind of energy storage liquid metal cell is provided in groups
Equalising control device, which is characterized in that including N number of concatenated liquid metal cell unit, voltage detection module, Balance route mould
Block and equalizing circuit module, wherein N >=0, and N is integer；
The liquid metal cell unit is made of the several sections of liquid metal cell monomers obtained by screening, after screening
The consistent liquid metal cell monomer of performance is placed in the same incubator, by first go here and there after and in the way of in groups, constitute liquid
State metal battery unit, N number of liquid metal cell unit by incubator outside lead connect；
The voltage detection module is used to detect the end voltage data of N number of liquid metal cell unit, and by voltage data
It is transported to equalization control module；
The equalization control module receives the voltage data of each battery unit of voltage detection module, and according to each battery
The voltage of unit selects balanced object and balanced opportunity, generates the pulse width modulation (PWM) driving signal of respective switch, and will
PWM drive signal is transported to equalizing circuit module for controlling turning on and off for respective switch pipe；
The equalizing circuit module is a kind of inductive type equalizing circuit based on switch matrix.
It is further preferred that the inductive type equalizing circuit in the equalizing circuit module includes 2N metal-oxide-semiconductor, 2 (N+1) a
Diode and a balanced inductance,
Wherein, described 2 (N+1) a diode, a metal-oxide-semiconductor of connecting in addition to diode D11 and diode D2N+1, on
Diode is stated to be serially connected between battery unit and balanced inductance to prevent battery short circuit；The diode D11 and diode D2N+1
Metal-oxide-semiconductor is not concatenated, provides continuous current circuit for equilibrium inductance.
Preferably, the diode selects the Schottky diode of low pressure drop.
More comparative test shows the stabilization that circuital current can be effectively improved using above-mentioned inductive type equalizing circuit
Property, and then improve stability and electric energy service efficiency that battery uses.Diode selects the Schottky diode of low pressure drop, energy
Enough reduce the pressure drop and loss in energy transfer process.
It is another aspect of this invention to provide that providing a kind of grouping charging and discharging Balance route side of energy storage liquid metal cell
Method, which comprises the steps of:
S1. a collection of battery is screened, liquid metal cell monomer is subjected to discharge capacity, voltage platform and coulomb and is imitated
The screening of three reference quantities of rate, screening obtain the consistent several sections of liquid metal cell monomers of performance；
S2. by the consistent several sections of liquid metal cell monomers of the performance after screening according to mode in parallel after first connecting, group
At a liquid metal cell unit；
S3. by screening for several times, several liquid metal cell units are obtained；
S4. several liquid metal cell units that screening obtains to be connected according to performance from excellent to bad, echelon utilizes,
Concatenated liquid metal cell unit charge and discharge are monitored and Balance route.
By the battery cell in liquid metal cell unit by first go here and there after and in the way of reasonably connected, on the one hand
It can be improved the voltage of battery unit, another aspect parallel way also can be realized the voltage in battery unit from equilibrium, relatively
Batteries monomer carries out Balance route respectively in incubator, on the one hand reduce incubator to outer lead, another party
Face has been greatly reduced the complexity of equalising control device.More comparative test show liquid metal cell after screening,
Under identical use environment, battery with two side terminals can still be maintained even across multi-turn circulation.
It is further preferred that in step S1, the screening process of the battery the following steps are included:
S11. a collection of liquid metal cell first identical to theoretical discharge capacity carries out charge-discharge test, filters out electric discharge and holds
Measure one group liquid metal cell of the difference 2%；
S12. again to after screening liquid metal cell group carry out 0.2C standard rate charge-discharge 2 enclose, be subject to second circle,
Filter out one group liquid metal cell of the voltage platform difference within 0.02V；
S13. 0.2C standard rate charge-discharge 10 is carried out to the one group of liquid metal cell newly filtered out to enclose, filter out coulomb
The preferably a collection of liquid metal cell monomer of one group liquid metal cell of the efficiency variance within 0.5%, as consistency.
More comparative test shows that one group of liquid metal cell consistency after above-mentioned screening is relatively high,
And long-play, influence of the difference of self-discharge rate to liquid metal cell performance is relatively small between battery cell.
Preferably, in step s 4, liquid metal cell unit charge and discharge are monitored and Balance route process includes
Following steps:
S41. by each battery cell voltage data of data collecting module collected, and it is transported to equalization control module；
S42. equalization control module judges whether cell voltage meets balanced unlocking condition, if satisfied, then going to step
S43 goes to step S46 if being unsatisfactory for；
S43. equalization control module generates the pulse width modulation (PWM) driving for needing balanced battery balanced charge and discharge metal-oxide-semiconductor
Signal, and it is transported to equalizing circuit module, while generating the charging and discharging currents that control signal makes charger reduce battery pack；
S44. equalizing circuit module is opened corresponding charge and discharge and is returned according to the pulse width modulation (PWM) driving signal received
The switching tube on road carries out active equalization process；
S45. equalization control module judges whether cell voltage meets balanced closedown condition, goes to step S46 if meeting,
Otherwise step S43 is gone to；
S46. equalising control device is closed, equilibrium terminates.
Specifically, Balance route strategy using voltage as balanced variable, with the very big liquid metal cell unit of voltage and
The minimum liquid metal cell unit of voltage is carried out greatly in battery set charge/discharge end with the euqalizing current of 0.1C as balanced object
Electric current active equalization.It is existing although can preferably reach balanced purpose using the Balance route strategy of SOC as balanced variable
SOC algorithm for estimating precision is inadequate, and especially for the liquid metal cell for being placed on high temperature dwell incubator, the SOC of single battery estimates
Meter depends on single battery current detecting, this is relatively difficult to achieve in actual operation；On the contrary, voltage detecting is simple, and only need
The voltage of battery unit is detected outside incubator, practical operation feasibility is higher.Selection is carried out in battery set charge/discharge end
High current active equalization, it is relatively flat to be primarily due to liquid metal cell charging and discharging curve, in the voltage platform phase, even if battery
Between SOC differ greatly, voltage differences still very little, therefore the stage does not carry out electric voltage equalization to battery pack, fills when battery is in
When electric discharge end, monomer battery voltage is changed greatly, and battery pack can be effectively improved by carrying out electric voltage equalization to battery pack at this time
Consistency.Meanwhile to avoid the batteries in parallel connection string being likely to occur as the SOC differential accumulation caused by the voltage platform phase, cause
High current phenomenon reduces the charging and discharging currents of battery pack when charge and discharge end opens balanced, extends self regulation time, effectively
Improve the capacity utilization of batteries in parallel connection group.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have the following advantages that and
The utility model has the advantages that
(1) liquid metal cell of the invention in discharge capacity, voltage platform and are filled in groups by equalising control device and method
Discharging efficiency etc. screens battery, and the higher several sections of liquid metal cells of consistency form a battery list after screening
Member is placed in the same high temperature dwell incubator, and the identical of use environment is conducive to keep the consistency between battery cell.Liquid
State metal battery is after screening, and under identical use environment, the consistent of battery can still be maintained even across multi-turn circulation
Property.
(2) the preferable battery cell of consistency is placed in the same incubator, guarantees that use environment is identical, according to elder generation
Mode after string simultaneously carries out in groups, and series connection improves the voltage of battery unit, the capacity of parallel connection raising battery unit, while parallel connection
Mode is able to carry out the voltage between battery strings from equilibrium, and selection carries out electric voltage equalization in battery charging and discharging end, while reducing and filling
Discharge current, on the one hand obvious with SOC variation due to charge and discharge terminal voltage, secondly reducing charging and discharging currents can alleviate
The battery high current phenomenon as caused by parallel connection, leads to battery overcurrent.
(3) in balance control method of the invention the several sections of liquid metal cell monomers of cell internal according to first going here and there again simultaneously
Mode be combined, series connection improves the voltage of battery unit, and parallel connection can be realized the voltage of cell internal from balanced,
It can reduce the complexity of equalising control device, while in order to promote shunt voltage from balanced effect, subtracting in charge and discharge end
The charging and discharging currents of baby battery group extend from time for balance.
(4) the Balance route strategy using voltage as balanced variable is used in the present invention, selection is carried out in charge and discharge end
Equilibrium differentiates, overcomes using SOC as balanced variable, SOC estimation precision is not high and the detection of incubator internal current is difficult to carry out
The problem of.Inductive type equalizing circuit is used in the present invention, the controllability of inductive current is strong, and the big electricity to battery unit may be implemented
Stream is balanced.
(5) equalising control device of the invention and control method be able to solve liquid metal cell voltage platform it is low and wide and
It is difficult to carry out the defect of active equalization control, and copes with hot environment locating when liquid metal cell uses in groups, is reduced
The complexity of equalising control device and control method improves the service performance of liquid metal cell.
Detailed description of the invention
Fig. 1 is equalising control device structure chart provided by the invention；
Fig. 2 Fig. 1 is the inductive type equalizing circuit topological diagram provided by the invention based on switch matrix；
Fig. 3 is liquid metal cell unit internal cell monomer connection type figure provided by the invention；
Fig. 4 is theoretical capacity 20Ah liquid metal cell charging/discharging voltage curve graph provided by the invention；
Fig. 5 is liquid metal cell balance control method flow chart provided by the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
As shown in Figure 1, being a kind of equalising control device in groups of energy storage liquid metal cell provided by the invention comprising
N number of concatenated liquid metal cell unit, voltage detection module, equalization control module and equalizing circuit module, wherein N >=0,
And N is integer；
The liquid metal cell unit is made of the several sections of liquid metal cell monomers obtained by screening, after screening
The consistent liquid metal cell monomer of performance is placed in the same incubator, by first go here and there after and in the way of in groups, constitute liquid
State metal battery unit, N number of liquid metal cell unit by incubator outside lead connect；
The voltage detection module is used to detect the end voltage data of N number of liquid metal cell unit, and by voltage data
It is transported to equalization control module；
The equalization control module receives the voltage data of each battery unit of voltage detection module, and according to each battery
The voltage of unit selects balanced object and balanced opportunity, generates the pulse width modulation (PWM) driving signal of respective switch, and will
PWM drive signal is transported to equalizing circuit module for controlling turning on and off for respective switch pipe；
The equalizing circuit module is a kind of inductive type equalizing circuit based on switch matrix.
In a preferred embodiment of the invention, the inductive type equalizing circuit in the equalizing circuit module includes 2N
The balanced inductance of metal-oxide-semiconductor, a diode of 2 (N+1) and one,
Wherein, described 2 (N+1) a diode, a metal-oxide-semiconductor of connecting in addition to diode D11 and diode D2N+1, on
Diode is stated to be serially connected between battery unit and balanced inductance to prevent battery short circuit；The diode D11 and diode D2N+1
Metal-oxide-semiconductor is not concatenated, provides continuous current circuit for equilibrium inductance.
In a preferred embodiment of the invention, the diode selects the Schottky diode of low pressure drop.
The present invention also provides a kind of grouping charging and discharging balance control method of energy storage liquid metal cell, feature exists
In including the following steps:
S1. a collection of battery is screened, liquid metal cell monomer is subjected to discharge capacity, voltage platform and coulomb and is imitated
The screening of three reference quantities of rate, screening obtain the consistent several sections of liquid metal cell monomers of performance；
S2. by the consistent several sections of liquid metal cell monomers of the performance after screening according to mode in parallel after first connecting, group
At a liquid metal cell unit；
S3. by screening for several times, several liquid metal cell units are obtained；
S4. several liquid metal cell units that screening obtains to be connected according to performance from excellent to bad, echelon utilizes,
Concatenated liquid metal cell unit charge and discharge are monitored and Balance route.
By the battery cell in liquid metal cell unit by first go here and there after and in the way of reasonably connected, on the one hand
It can be improved the voltage of battery unit, another aspect parallel way also can be realized the voltage in battery unit from equilibrium, relatively
Batteries monomer carries out Balance route respectively in incubator, on the one hand reduce incubator to outer lead, another party
Face has been greatly reduced the complexity of equalising control device.
In a preferred embodiment of the invention, in step S1, the screening process of the battery the following steps are included:
S11. a collection of liquid metal cell first identical to theoretical discharge capacity carries out charge-discharge test, filters out electric discharge and holds
Measure one group liquid metal cell of the difference 2%；
S12. again to after screening liquid metal cell group carry out 0.2C standard rate charge-discharge 2 enclose, be subject to second circle,
Filter out one group liquid metal cell of the voltage platform difference within 0.02V；
S13. 0.2C standard rate charge-discharge 10 is carried out to the one group of liquid metal cell newly filtered out to enclose, filter out coulomb
The preferably a collection of liquid metal cell monomer of one group liquid metal cell of the efficiency variance within 0.5%, as consistency.
In a preferred embodiment of the invention, in step s 4, liquid metal cell unit charge and discharge are supervised
Survey and Balance route process the following steps are included:
S41. by each battery cell voltage data of data collecting module collected, and it is transported to equalization control module；
S42. equalization control module judges whether cell voltage meets balanced unlocking condition, if satisfied, then going to step
S43 goes to step S46 if being unsatisfactory for；
S43. equalization control module generates the pulse width modulation (PWM) driving for needing balanced battery balanced charge and discharge metal-oxide-semiconductor
Signal, and it is transported to equalizing circuit module, while generating the charging and discharging currents that control signal makes charger reduce battery pack；
S44. equalizing circuit module is opened corresponding charge and discharge and is returned according to the pulse width modulation (PWM) driving signal received
The switching tube on road carries out active equalization process；
S45. equalization control module judges whether cell voltage meets balanced closedown condition, goes to step S46 if meeting,
Otherwise step S43 is gone to；
S46. equalising control device is closed, equilibrium terminates.
Preferably to explain the present invention, a specific embodiment given below:
Embodiment
As shown in Figure 1, being a kind of energy storage liquid metal cell equalising control device provided by the invention, including N number of string
The liquid metal cell unit of connection, voltage detection module, equalization control module, equalizing circuit module.
Liquid metal cell unit is by utilizing the 6 section liquid metals that obtained theoretical capacity is 20Ah by screening and echelon
Battery cell is constituted.The 6 section liquid metal cells that each battery unit is included are placed in an incubator, N number of liquid gold
Belong to battery unit by incubator outside lead connect.
Voltage detection module is used to detect the end voltage data of N number of liquid metal cell unit, and voltage data is conveyed
To equalization control module.
Equalization control module receives the voltage data of voltage detection module, and is selected according to the voltage of each battery unit
Weighing apparatus opportunity and balanced object, generate the PWM drive signal of respective switch, are transported to equalizing circuit module for controlling respective switch
Pipe turns on and off.
Equalizing circuit module, as shown in Fig. 2, being a kind of inductive type equalizing circuit based on switch matrix, by 2N MOS
Pipe, a diode of 2 (N+1), a balanced inductance are constituted.Wherein, 2 (N+1) a diodes are connected in addition to D11 and D2N+1
One metal-oxide-semiconductor, is serially connected between battery unit and inductance, can prevent battery short circuit.D11 and D2N+1 do not concatenate metal-oxide-semiconductor, are
Inductance provides continuous current circuit.In order to reduce the pressure drop and loss in energy transfer process, diode selects the Schottky of low pressure drop
Diode.
The present invention provides a kind of groups of charge and discharge balancing control method of energy storage liquid metal cell, and control flow is as schemed
Shown in 3, include the following steps:
It is utilized firstly, screen simultaneously echelon to a collection of battery, by discharge capacity, voltage platform and coulombic efficiency three
After reference quantity screening, it is determined the preferable liquid metal cell of consistency and forms a battery unit, echelon utilizes consistency not
Same battery unit.
The screening process includes:
(1) different current charging and dischargings are carried out to a collection of liquid metal cell that theoretical discharge capacity is 20Ah, filters out and puts
One group battery of the capacitance difference 2%.
(2) again to after screening battery pack carry out 0.2C standard rate charge-discharge 2 enclose, be subject to second circle, filter out electricity
One group battery of the flattening bench difference within 0.02V.
(3) it is enclosed finally, carrying out 0.2C standard rate charge-discharge 10 to the one group of battery newly filtered out, filters out coulombic efficiency
One group battery of the difference within 0.5%.
Experience have shown that one group of liquid metal cell consistency after screening is relatively high, and long-play,
Influence of the difference of self-discharge rate to liquid metal cell performance is relatively small between battery cell.
Secondly, in liquid metal cell unit battery unit connection type as shown in figure 4, by the consistency after screening compared with
6 good section liquid metal cell B1, B2, B3, which are connected, obtains B1 ', B4, B5, B6 carry out series connection B2 ', then by B1 ' and B2 ' into
Row composes in parallel a battery unit, and the voltage of battery unit is the sum of three section liquid metal cell voltages, cell internal
After first going here and there and by way of be attached, on the one hand can be improved the voltage of battery unit, on the other hand due to B1 ' and B2 '
Parallel connection also can be realized the voltage in battery unit from equilibrium, carry out equilibrium respectively relative to 6 batteries monomers in incubator
Control, on the one hand reduce incubator to outer lead, on the other hand also reduce the complexity of equalising control device.
Finally, all battery units are connected according to performance from excellent to bad again, to the charge and discharge of series-connected cell unit into
Row monitoring and Balance route.
Balance route strategy is used as balanced variable using voltage, minimum with the very big liquid metal cell unit of voltage and voltage
Liquid metal cell unit is balanced object, actively equal with 0.1C euqalizing current progress high current in battery set charge/discharge end
Weighing apparatus.Although can preferably reach balanced purpose using the Balance route strategy of SOC as balanced variable, existing SOC estimation is calculated
Method precision is inadequate, and especially for the liquid metal cell for being placed on high temperature dwell incubator, the SOC estimation of single battery is dependent on single
The detection of body battery current, this is relatively difficult to achieve in actual operation；On the contrary, voltage detecting is simple, and only need to examine outside incubator
The voltage of battery unit is surveyed, practical operation feasibility is higher.Selection carries out high current actively in battery set charge/discharge end
It is relatively flat to be primarily due to liquid metal cell charging and discharging curve for equilibrium, as shown in figure 5, in the voltage platform phase, even if battery
Between SOC differ greatly, voltage differences still very little, therefore the stage does not carry out electric voltage equalization to battery pack, fills when battery is in
When electric discharge end, monomer battery voltage is changed greatly, and battery pack can be effectively improved by carrying out electric voltage equalization to battery pack at this time
Consistency.Meanwhile to avoid the batteries in parallel connection string being likely to occur as the SOC differential accumulation caused by the voltage platform phase, and
Charge and discharge end generates high current phenomenon, when equilibrium is opened, reduces the charging and discharging currents of battery pack, extends self regulation time, have
Effect improves the capacity utilization of batteries in parallel connection group.
Further battery unit charge and discharge are monitored and Balance route, equilibrium detection and control flow chart such as Fig. 5
It is shown, comprising:
(1) data acquisition module acquires each battery cell voltage data, and is transported to equalization control module.
(2) equalization control module judges whether cell voltage meets balanced unlocking condition, i.e., battery unit is in charge and discharge
The end and very poor 50mV that is greater than of voltage if satisfied, then going to step (3) goes to step (6) if being unsatisfactory for.
(3) equalization control module generates the pulse width modulation (PWM) signal for needing balanced battery balanced charge and discharge metal-oxide-semiconductor,
And it is transported to equalizing circuit module, while generating the charging and discharging currents that control signal makes charger reduce battery pack.
(4) equalizing circuit module opens opening for corresponding charging and discharging circuit according to the pulse width modulation (PWM) signal received
It closes, carries out active equalization process.
(5) equalization control module judges whether cell voltage meets balanced closedown condition, i.e., voltage is very poor is less than 50mV, if
Satisfaction then goes to (6), otherwise goes to (3).
(6) equalizing circuit is closed, equilibrium terminates.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (4)
1. a kind of grouping charging and discharging balance control method of energy storage liquid metal cell, which comprises the steps of:
S1. a collection of battery is screened, liquid metal cell monomer is subjected to discharge capacity, voltage platform and coulombic efficiency three
The screening of a reference quantity, screening obtain the consistent several sections of liquid metal cell monomers of performance；Wherein, the screening process include with
Lower sub-step:
S11. a collection of liquid metal cell first identical to theoretical discharge capacity carries out charge-discharge test, and it is poor to filter out discharge capacity
Different one group of liquid metal cell 2%；
S12. again to after screening liquid metal cell group carry out 0.2C standard rate charge-discharge 2 enclose, be subject to second circle, screening
One group liquid metal cell of the voltage platform difference within 0.02V out；
S13. 0.2C standard rate charge-discharge 10 is carried out to the one group of liquid metal cell newly filtered out to enclose, filter out coulombic efficiency
The preferably a collection of liquid metal cell monomer of one group liquid metal cell of the difference within 0.5%, as consistency of performance；
S2. by the consistent several sections of liquid metal cell monomers of the performance after screening according to mode in parallel after first connecting, composition one
A liquid metal cell unit；
S3. by screening for several times, several liquid metal cell units are obtained；
S4. several liquid metal cell units that screening obtains are connected according to performance from excellent to bad, echelon utilizes, to string
The liquid metal cell unit charge and discharge of connection are monitored and Balance route.
2. grouping charging and discharging balance control method as described in claim 1, which is characterized in that in step s 4, to liquid gold
Category battery unit charge and discharge are monitored and Balance route process includes following sub-step:
S41. by each battery cell voltage data of data collecting module collected, and it is transported to equalization control module；
S42. equalization control module judges whether cell voltage meets balanced unlocking condition, if satisfied, sub-step S43 is then gone to,
Sub-step S46 is gone to if being unsatisfactory for；
S43. equalization control module generates the pulse width modulation (PWM) driving signal for needing balanced battery balanced charge and discharge metal-oxide-semiconductor,
And it is transported to equalizing circuit module, while generating the charging and discharging currents that control signal makes charger reduce battery pack；
S44. equalizing circuit module opens corresponding charging and discharging circuit according to the pulse width modulation (PWM) driving signal received
Switching tube carries out active equalization process；
S45. equalization control module judges whether cell voltage meets balanced closedown condition, goes to sub-step S46 if meeting, no
Then go to sub-step S43；
S46. equalising control device is closed, equilibrium terminates.
3. a kind of equalising control device in groups of energy storage liquid metal cell, it is suitable for filling in groups as described in claim 1
Equalization discharge control method, which is characterized in that the device include N number of concatenated liquid metal cell unit, voltage detection module,
Equalization control module and equalizing circuit module, wherein N >=0, and N is integer；
The liquid metal cell unit is made of the several sections of liquid metal cell monomers obtained by screening, and as described above
The consistent liquid metal cell monomer of performance after executing screening is placed in the same incubator, in the way of after first string simultaneously
In groups, constitute liquid metal cell unit, N number of liquid metal cell unit by incubator outside lead connect；
The voltage detection module is used to detect the end voltage data of N number of liquid metal cell unit, and voltage data is conveyed
To equalization control module；
The equalization control module receives the voltage data of each battery unit of voltage detection module, and according to each battery unit
Voltage select balanced object and balanced opportunity, generate the pulse width modulation (PWM) driving signal of respective switch, and PWM is driven
Dynamic signal is transported to equalizing circuit module for controlling turning on and off for respective switch pipe；
The equalizing circuit module is a kind of inductive type equalizing circuit based on switch matrix.
4. equalising control device in groups as claimed in claim 3, which is characterized in that the inductive type in the equalizing circuit module
Equalizing circuit includes 2N metal-oxide-semiconductor, a diode of 2 (N+1) and a balanced inductance；
Wherein, described 2 (N+1) a diode, a metal-oxide-semiconductor of connecting in addition to diode D11 and diode D2N+1, above-mentioned two
Pole pipe is serially connected between battery unit and balanced inductance to prevent battery short circuit；The diode D11 and diode D2N+1 do not go here and there
Metal-oxide-semiconductor is connect, provides continuous current circuit for equilibrium inductance.
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| CN110015130B (en) * | 2017-08-31 | 2021-01-19 | 比亚迪股份有限公司 | Battery equalization system, vehicle, battery equalization method, and storage medium |
| CN108598606B (en) * | 2018-05-27 | 2021-06-29 | 贵州中伟资源循环产业发展有限公司 | Waste power lithium battery module detects and energy-conserving ladder recovery system of restoreing |
| CN112133976B (en) * | 2020-08-25 | 2022-04-12 | 合肥国轩高科动力能源有限公司 | Battery pack module balancing method |
| CN112260372B (en) * | 2020-12-23 | 2021-04-27 | 江苏时代新能源科技有限公司 | Battery equalization method and device and battery management system |
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| JP2007165324A (en) * | 2005-12-16 | 2007-06-28 | Amita Technologies Inc Ltd | Protection method and device for lithium battery |
| CN103199588A (en) * | 2013-04-08 | 2013-07-10 | 天津大学 | Series connection storage battery slope current equalizer and control method thereof based on bridge circuit |
| CN103248090A (en) * | 2013-04-18 | 2013-08-14 | 湖南大学 | Novel integrated design for equalizing system of BEV (blade electric vehicle) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007165324A (en) * | 2005-12-16 | 2007-06-28 | Amita Technologies Inc Ltd | Protection method and device for lithium battery |
| CN103199588A (en) * | 2013-04-08 | 2013-07-10 | 天津大学 | Series connection storage battery slope current equalizer and control method thereof based on bridge circuit |
| CN103248090A (en) * | 2013-04-18 | 2013-08-14 | 湖南大学 | Novel integrated design for equalizing system of BEV (blade electric vehicle) |
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