CN110048487A - A kind of control method and its system of battery charging and discharging - Google Patents
A kind of control method and its system of battery charging and discharging Download PDFInfo
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- CN110048487A CN110048487A CN201910407036.4A CN201910407036A CN110048487A CN 110048487 A CN110048487 A CN 110048487A CN 201910407036 A CN201910407036 A CN 201910407036A CN 110048487 A CN110048487 A CN 110048487A
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- 238000007599 discharging Methods 0.000 title claims abstract description 38
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- 230000008569 process Effects 0.000 claims description 20
- 230000005611 electricity Effects 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 11
- 230000000875 corresponding effect Effects 0.000 description 17
- 230000008901 benefit Effects 0.000 description 3
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- 238000004146 energy storage Methods 0.000 description 3
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Classifications
-
- 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
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- 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
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
-
- 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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- 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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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
This application discloses a kind of control method of battery charging and discharging and its systems, and wherein the control method of battery charging and discharging is specifically includes the following steps: detect the state of each battery unit；According to the state of all battery units, chooses specified several stacks of cells synthesis series circuit and carry out charge/discharge；Charge/discharge after a period of time, according to the current state of all battery units, reconfigures to obtain new series circuit, carries out charge/discharge to the battery unit in new series circuit.The application can carry out the control of charge and discharge dynamic equalization to battery pack, on the basis of guaranteeing that series-connected cell group stablizes input/output, realize the full full of putting of battery pack, make full use of all capacities of battery pack, avoid redundant configuration.
Description
Technical field
This application involves field of batteries, and in particular, to a kind of control method and its system of battery charging and discharging.
Background technique
In the prior art, due to production technology the problems such as, battery cell capacity are smaller, it is difficult to meet load and energy storage is held
The demand of amount, so battery group, which uses, becomes inevitable.In order to meet required electric current, voltage or power requirement, needing will be big
The single battery of amount forms large-scale battery system with parallel form to connect.In battery group technology, low capacity monomer
Battery group or networking have greatly in energy-storage system safety, reliability and control aspect of performance relatively high capacity single battery
Advantage.This point is confirmed by numerous practical applications, for example, tesla's Model S electric car uses 8127 sections 18650
Low capacity single battery.However, having unavoidable inconsistency, even same producer, the electricity with batch between battery cell
Pond, charge-discharge characteristic, temperature characterisitic, capacity, in terms of the generally existing difference of parameter, and these differences are in battery
Use process in continue to increase.In order to solve the problems, such as the inconsistent generation of single battery, it is ensured that battery performance is good, extends electricity
Pond service life, in addition to carrying out partial volume screening to single battery, it is also necessary to which battery progress is rationally effectively managed and controlled.
And traditional battery management system mainly uses balancing technique, including active equalization and passive equilibrium.It is passive balanced
It is discharged by adding modes, the batteries high to voltage such as bypass resistance to each battery, so that each in series-connected cell group
Cell voltage reaches balance, mainly solves the equalization problem in charging process, helpless to equalization discharge, while equalizing circuit
It will cause certain energy loss, reduce the energy ecology of battery system；Active equalization is by increasing capacitor, transformer etc.
Energy stores or transformation device realize the energy transfer between adjacent cell, and loss equalizing is low, but component is more, structure is multiple
Miscellaneous, at high cost, equalization efficiency is lower, it is difficult to make full use of all capacity of battery pack.Therefore it needs a kind of suitably to battery
The control method of charge and discharge can regenerate a kind of new battery group mode, based on which to the battery group after
Battery in large-scale energy storage system carries out efficient charge and discharge.
Summary of the invention
A kind of control method and its system for being designed to provide battery charging and discharging of the application, can be realized battery pack and exists
Dynamic equalization during charging and discharging solves the problems, such as battery consistency, improves battery capacity utilization rate.
In order to achieve the above objectives, this application provides a kind of control methods of battery charging and discharging, specifically includes the following steps:
Detect the state of each battery unit；According to the state of all battery units, chooses several specified battery units and be combined into
Series circuit carries out charge/discharge；According to the current state of all battery units, constantly reconfigure to obtain new series electrical
Road carries out charge/discharge to the battery unit in new series circuit.
As above, wherein any time in charge and discharge process, by detecting and being calculated each battery unit
Voltage, electric current, internal resistance, state of charge information data are held, is sentenced according to current state of the state-of-charge data to battery unit
It is disconnected.
It is as above, wherein in charge and discharge process, when charge/discharge time reaches designated value, then to be worked as according to battery unit
Preceding state reconfigure forming new series circuit to battery unit.
As above, wherein charge and discharge are carried out to battery unit and specifically include following sub-step: according to the current of battery unit
State chooses several specified battery units from N number of battery unit, and battery unit access circuit is formed series-connected cell
Group carries out charge/discharge to the battery unit in series-connected cell group.
As above, wherein by battery unit access circuit composition series-connected cell group specifically includes the following steps: to all electricity
Pool unit is ranked up；According to ranking results, select several specified battery units, and to the terminal voltage value of battery unit into
Row summation, so that specified range of the summed result without departing from DC bus-bar voltage；According to selection result, by several specified electricity
Pool unit accesses circuit and forms series-connected cell group.
As above, wherein during the charging process, according to the n battery unit that ranking results select state of charge low, make
Obtain specified range of the sum of the end voltage of n battery unit without departing from DC bus-bar voltage.
It is as above, wherein during discharge, according to a battery unit of n ' that ranking results select state of charge high,
So that specified range of the sum of the end voltage of a battery unit of n ' without departing from DC bus-bar voltage.
A kind of control system of battery charging and discharging specifically includes battery pack, detection unit, control unit, energy conversion list
Member and load；It wherein include battery unit and the tandem tap Ss (i) and paralleling switch for connecting battery unit in battery pack
Sp (i), the end voltage of battery unit are used to meet the demand voltage of load or system；Detection unit detects and calculates battery pack
In each battery unit end voltage, electric current, internal resistance, state of charge information data；Control unit, according to the current of battery unit
The loading demand that state and energy conversion unit provide, controls the combination of battery in battery pack；Energy conversion unit,
Also the direct current that the battery pack after combination is exported is converted, with the voltage requirement of matched load.
As above, wherein one end of tandem tap Ss (i) is connected with positive one end of battery unit B (i), tandem tap
The other end of Ss (i) is connected with one end of paralleling switch Sp (i), the other end of paralleling switch Sp (i) and battery unit B's (i)
The connection of cathode one end.
As above, wherein need to carry out corresponding tandem tap Ss (i) closure of battery unit of charge or discharge, it is in parallel
Switch Sp (i) is disconnected；Otherwise corresponding tandem tap Ss (i) disconnects, paralleling switch Sp (i) closure.
The application has the advantages that
(1) control method and its system of battery charging and discharging provided by the present application can carry out during charging and discharging
Discrete control, within each set time, the current state based on battery unit, dynamic adjustment accesses the battery in series circuit
Unit combination, the minimum battery unit of dynamic select state-of-charge combines during the charging process, during discharge dynamic select
The highest combination of state-of-charge.
(2) control method and its system of battery charging and discharging provided by the present application can carry out charge and discharge electro dynamic to battery pack
Balance route is realized the full full of putting of battery pack, is made full use of on the basis of guaranteeing that series-connected cell group stablizes input/output
All capacities of battery pack, avoid redundant configuration.
(3) control method and its system of battery charging and discharging provided by the present application are capable of providing the new battery group of one kind
Mode realizes the Balance route of battery charging and discharging based on which.
(4) control method of battery charging and discharging provided by the present application and its each battery unit in system connect one
Tandem tap and paralleling switch are controlled by the combination switched to the two, can access or exit at any time string for the battery unit
Join circuit.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application can also be obtained according to these attached drawings other for those of ordinary skill in the art
Attached drawing.
Fig. 1 is the structural schematic diagram inside the control system according to battery charging and discharging provided by the embodiments of the present application；
Fig. 2 is the internal connection circuit figure according to battery pack provided by the embodiments of the present application；
Fig. 3 is the control method flow chart according to battery charging and discharging provided by the embodiments of the present application.
Specific embodiment
Below with reference to the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Ground description, it is clear that described embodiment is some embodiments of the present application, instead of all the embodiments.Based on the application
In embodiment, those skilled in the art's every other embodiment obtained without making creative work, all
Belong to the range of the application protection.
This application involves a kind of control method of battery charging and discharging and systems.According to the application, it can be realized battery pack and exist
Dynamic equalization during charging and discharging solves the problems, such as battery consistency, improves battery capacity utilization rate.
As shown in Figure 1, being the structural schematic diagram inside the control system of battery charging and discharging provided by the present application, electricity is specifically included
Pond group 101, detection unit 102, control unit 103, energy conversion unit 104, load 105.
Wherein battery pack 101 is used to be that load 105 provides corresponding voltage by charge or discharge.As shown in Fig. 2, for electricity
The connection circuit diagram of Chi Zuzhong battery unit.
Specifically, in battery pack 101 include N number of battery unit B (i), several tandem tap Ss (i) and several simultaneously
Join switch Sp (i).It wherein include one or more single battery (not shown)s in battery unit B (i).
Wherein the quantity of tandem tap Ss (i) and paralleling switch Sp (i) should be identical as the quantity of battery unit.
Preferably, single battery is integrated in battery unit B (i) by concatenated connection type after directly in parallel or first parallel connection
In.
Further, one end of tandem tap Ss (i) is connected with positive one end of battery unit B (i), tandem tap Ss
(i) the other end is connected with one end of paralleling switch Sp (i), the other end of paralleling switch Sp (i) and bearing for battery unit B (i)
The connection of pole one end.Tandem tap Ss (i) and battery unit B (i) series, parallel switch Sp are formd by above-mentioned connection type
(i) in parallel with tandem tap Ss (i) with battery unit B (i).
Detection unit 102 is connect with battery pack 101, for detecting and calculating the end of each battery unit in battery pack 101
The information datas such as voltage, electric current, internal resistance, SOC (state of charge, state-of-charge), according to SOC data in battery pack
The current state of battery unit is judged.
Specifically, wherein SOC data can be calculated according to parameters such as the end voltages, electric current, internal resistance of detection, be calculated
Method can refer to the calculation method of SOC in the prior art.
Control unit 103 is connect with detection unit 102, battery pack 101 and energy conversion unit 104 respectively, wherein can
Amount converting unit 104 can obtain the voltage requirements of load, and control unit 103 is used to be carried out according to the current state of battery unit
It is after sequence as a result, and energy conversion unit 105 provide loading demand, control battery in battery pack combination to battery
Unit carries out charge/discharge, to control being opened or closed for tandem tap and paralleling switch.
Wherein, in charging process: the n battery unit that control unit 103 selects SOC value low according to ranking results, so that n
The sum of end voltage of a battery unit charges to n battery unit without departing from the specified range of DC bus-bar voltage；It is putting
Electric process: a battery unit of n ' that control unit 103 selects SOC value high according to ranking results, so that the end of a battery unit of n '
The sum of voltage discharges to a battery unit of n ' without departing from the specified range of DC bus-bar voltage.
Specifically, according to whether meeting formulaBattery unit is chosen to charge.Wherein U '
It (i) is the end voltage of i-th of battery unit, U is the DC bus-bar voltage of system, and n is the number for the battery unit summed,
I=1,2 ..., n.If the sum of the end voltage of n battery unit is equal to the DC bus-bar voltage of system, n battery unit is carried out
Charging.
For another example ifSpecified range of the calculated result without departing from U, then still filled for n battery unit
Electricity.
Specifically, also according to formulaBattery unit is chosen to discharge.Wherein n ' be into
The number of the battery unit of row summation, i=1,2 ..., n '.If the sum of end voltage of a battery unit of n ' is equal to DC voltage,
Then discharge a battery unit of n '.
For another example ifSpecified range of the calculated result without departing from U, then still carried out for a battery unit of n '
Electric discharge.
Preferably, specified range is by being artificially arranged and can be modified, therefore without limiting.
Energy conversion unit 104 is connect with battery pack 101 and load 105 respectively, energy conversion unit 104 and load and electricity
Pond group carries out energy transmission, and the direct current for being exported the battery pack after combination is converted, with the voltage of matched load
It is required that.
It is illustrated in figure 3 the control method flow chart of battery charging and discharging provided by the present application.
Step S310: the state of each battery unit is detected.
Specifically, wherein at any time, detection unit 102 detects the state of each battery unit in battery pack 101.Its
The information datas such as the SOC value that middle state is detected by detection unit 102 determine.
Step S320: according to the state of all battery units, specified several stacks of cells synthesis series electrical is chosen
Road carries out charge/discharge.
Specifically, control unit 103 carries out the selection of battery unit simultaneously according to the battery status that detection unit 102 detects
Charge/discharge is carried out to it.According to the state of battery unit, n battery unit is chosen from N number of battery unit, is accessed
Circuit forms series-connected cell group.
In charging process, following sub-step is specifically included:
Step D1: according to the state of battery unit, n battery unit is chosen from N number of battery unit, is accessed circuit
Form series-connected cell group.
Wherein choose n battery unit, accessed circuit form series-connected cell group specifically includes the following steps:
Step W1: battery unit is ranked up.
Specifically, battery unit is ranked up according to the SOC numerical values recited of battery unit.The wherein size of SOC numerical value
Be positively correlated with the voltage swing of battery unit, therefore the SOC numerical value the big, the end voltage for representing battery unit is about big, it is on the contrary then
It is smaller.
Step W2: it according to ranking results, chooses the lower battery unit for specifying several of SOC numerical value and sums.
Specifically, according to whether meeting formulaDetermine the battery unit chosen.Wherein U ' (i) is i-th
The end voltage of each and every one battery unit, U are the DC bus-bar voltage of system, and n is the number for the battery unit summed, i=1,
2 ..., n.
Illustratively, if the quantity of battery in battery pack unit is 10, the DC bus-bar voltage of system is 100V, then will
It is added according to end voltage of the sequence from low to high to battery unit, if being added to always from the last one battery unit
The end voltage summation of 2 battery units is equal to DC bus-bar voltage 100V, then n=9, if the last one is until the 4th battery list
The end voltage summation of member is equal to 100V, then n=7.
Significantly, since the end voltage of battery unit is there may be real-time fine error and loss, therefore electricity
When the sum of end voltage of pool unit is approximately equal to DC bus-bar voltage, also referred to as it is equal in this application.
In another case, if the end voltage of battery unit still can without departing from the specified range of DC bus-bar voltage
Enough determine the value of n.Such as wherein the sum of end voltage of n battery unit is 110V, then the end voltage of the battery unit does not surpass
It crosses in the specified range of DC bus-bar voltage, can determine the value of n.
Preferably, specified range is set according to the concrete condition of system, herein without the restriction of specific value.
Step W3: according to selection result, n battery unit access circuit is formed into series-connected cell group.
By step W2, so that specified range of the sum of the end voltage of n battery unit without departing from DC bus-bar voltage, from
And determine the quantity of battery unit and position in access series circuit.
Specifically, composition series-connected cell group can disconnect n battery by closing the corresponding tandem tap of n battery unit
Unit corresponds to paralleling switch to realize.
Illustratively, it if B (1), B (3), B (5), the state of B (7) are poor, is preferentially accessed and forms series connection in circuit
The corresponding tandem tap Ss (1) of B (1) is specifically closed, paralleling switch Sp (1) is disconnected by battery pack；The corresponding series connection of B (3)
Switch Ss (3) closure, paralleling switch Sp (3) are disconnected；Corresponding tandem tap Ss (5) closure of B (5), paralleling switch Sp (5) are disconnected
It opens；Corresponding tandem tap Ss (7) closure of B (7), paralleling switch Sp (7) are disconnected.Remaining N-n do not need the electricity of access circuit
Then corresponding tandem tap Ss (i) disconnects pool unit, paralleling switch Sp (i) closure, N-n battery unit temporary withdrawal series electrical
Chi Zuzhong.
It is worth noting that, above-mentioned B (1), B (3), B (5), B (7) are only as an example, battery unit in practical situations
Model or quantity herein without limit.
Preferably, the quantity of the remaining N-n battery units for not needing access circuit should be much larger than 1.
Step D2: it connects and completes in response to battery pack, charge to it.
Specifically, it according to the battery pack connected, charges to corresponding battery unit.
Specifically, wherein specifically including following sub-step during discharge:
Step P1: according to the state of battery unit, a battery unit of n ' is chosen from N number of battery unit, is accessed electricity
Road forms series-connected cell group.
Wherein choose n ' battery unit, accessed circuit composition series-connected cell group specifically includes the following steps:
Step Q1: battery unit is ranked up.
Preferably, similar to the method to sort in step W1, according to battery unit SOC numerical values recited to battery unit into
Row sorts from high to low, and the sequence of the more big then battery unit of SOC numerical value is more forward.
Step Q2: it according to ranking results, chooses higher several the specified battery unit of SOC numerical value and sums.
Specifically, several higher battery units of SOC value are chosen, such as choose preceding 5 electricity in 10 battery units
The end voltage of pool unit is summed.
The value of several battery units can equally pass through formulaIt acquires, specifically, n ' is
The number for the battery unit summed, i=1,2 ..., n '.If in step Q2, the end voltage of preceding 5 battery units meets volume
Fixed DC voltage is then n '=5, if the end voltage of preceding 3 battery units is equal to DC bus-bar voltage, n '=3.
Further, if still can in end specified range of the voltage without departing from specified DC voltage of battery unit
Enough determine the value of n '.
Step Q3: according to selection result, a battery unit access circuit of n ' is formed into series-connected cell group.
By step Q2, so that specified range of the sum of the end voltage of a battery unit of n ' without departing from DC bus-bar voltage,
So that it is determined that the quantity of battery unit and position in access series circuit.
Specifically, composition series-connected cell group can be closed n battery by disconnecting the corresponding tandem tap of a battery unit of n '
Unit corresponds to paralleling switch to realize.
Illustratively, if B (2), B (4), B (6), the state of B (8) are preferable, by the corresponding tandem tap Ss (2) of B (2)
Closure, paralleling switch Sp (2) are disconnected；Corresponding tandem tap Ss (4) closure of B (4), paralleling switch Sp (4) are disconnected；B (6) is corresponding
Tandem tap Ss (6) closure, paralleling switch Sp (6) disconnect；Corresponding tandem tap Ss (8) closure of B (8), paralleling switch Sp
(8) it disconnects.The access of a battery unit temporary withdrawal series-connected cell group for not needing access circuit of remaining N-n '.
Preferably, the quantity of a battery unit for not needing access circuit of remaining N-n ' should be much larger than 1.
Step P2: it connects and completes in response to battery pack, discharge it.
Specifically, it according to the battery pack connected, discharges corresponding battery unit.
Step S330: judge whether charge/discharge reaches maximum charged with minimum in specified time or all battery units
Whether the difference of state value is more than specified threshold.
If it is more than specified for reaching the maximum difference with minimum state of charge in specified time or current all battery units
Threshold value then re-execute the steps S320, judges the state of battery unit and continues to be reassembled into series circuit according to the state
Carry out charge/discharge.
If not reaching the maximum difference with minimum SOC value in specified time or current all battery units is less than specified threshold
Value, then continue charge/discharge.
It, can be by carrying out reconfiguring for battery unit after appointed interval wherein in charge/discharge process.This is specified
The numerical value at interval is by being artificially arranged and can be modified, and specific value is in the present embodiment without limiting.
Specifically, during the charging process, if the lower n battery unit of state-of-charge is charging, refer to reaching
It fixes time behind interval, then the n battery unit is subjected to state judgement together with remaining N-n battery unit, reconfigured,
Execute step W1-W3.
If such as the sum of battery unit is 20, first has chosen 8 lower stacks of cells of state-of-charge into series connection
Battery pack charges, after reaching specified time interval, again to 8 battery units and remaining 12 battery units into
The judgement of row state reconfigures to obtain new series-connected cell group, then proceeds by charging.
According to above-mentioned charging modes, overcharging in battery unit can be prevented from or leaked to fill.
Wherein it can also be carried out according to the difference with minimum SOC maximum in current all battery units as recombination trigger condition
Battery unit reconfigures.
Specifically, when n battery unit is charged, in N number of battery unit, the SOC value of a certain battery unit with
The difference of the SOC of a certain battery unit is more than specified threshold, then re-execute the steps W1-W3, choose the new electricity charge
Pool unit.
Specifically, reconfiguring for battery unit is reconfigured with battery unit in charging process in discharge process
Principle is similar.Specifically, during discharge, if a battery unit of the higher n ' of state-of-charge is discharging, reaching
Behind specified time interval, then a battery unit of the n ' is subjected to state judgement together with a battery unit of remaining N-n ', again
Combination, i.e. execution step Q1-Q3.
Further, also recombination triggering item can be used as according to the difference with minimum SOC maximum in current all battery units
Part carries out reconfiguring for battery unit.
Specifically, when a battery unit of n ' is discharged, in N number of battery unit, the SOC value of a certain battery unit with
The difference of the SOC of a certain battery unit is more than specified threshold, then re-execute the steps Q1-Q3, choose the new electricity discharge
Pool unit.
Specifically, it can carry out closing/disconnecting corresponding tandem tap Ss (i)/Sp according to the battery unit after choosing again
(i) concatenated battery pack is formed it into, and charge/discharge is carried out to the battery unit after choosing again.Wherein charge/discharge
Method can refer to the narration in step S320 with reference to step and specific connection type, herein without repeating.
By constantly being reconfigured to battery pack, may be implemented, in charging process, all battery units are ok
It is full of；In discharge process, all battery units can be vented as far as possible.It is not additional in the control method of the charge and discharge
The full full of putting of battery pack may be implemented in energy content of battery loss, improves the arrangement utilization efficiency and energy conversion effect of battery pack
Rate.
Step S340: in response to all battery units it is at full charge or emptying electricity, then charge or discharge process terminates.
Charge and discharge wherein are carried out by constantly carrying out new combination to all battery units, until completing charge/discharge
Task.
The application has the advantages that
(1) control method and its system of battery charging and discharging provided by the present application can carry out during charging and discharging
Discrete control, within each time, the current state based on battery unit, dynamic adjustment accesses the battery unit in series circuit
Combination, the minimum battery unit combination of dynamic select state-of-charge during the charging process, dynamic select is charged during discharge
The highest combination of state.
(2) control method and its system of battery charging and discharging provided by the present application can carry out charge and discharge electro dynamic to battery pack
Balance route is realized the full full of putting of battery pack, is made full use of on the basis of guaranteeing that series-connected cell group stablizes input/output
All capacities of battery pack, avoid redundant configuration.
(3) control method and its system of battery charging and discharging provided by the present application are capable of providing the new battery group of one kind
Mode realizes the Balance route of battery charging and discharging based on which.
(4) control method of battery charging and discharging provided by the present application and its each battery unit in system connect one
Tandem tap and paralleling switch are controlled by the combination switched to the two, can access or exit at any time string for the battery unit
Join circuit.
Although the example of present application reference is described, it is intended merely to the purpose explained rather than the limit to the application
System, the change to embodiment, increase and/or deletion can be made without departing from scope of the present application.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Those familiar with the art within the technical scope of the present application, can easily think of the change or the replacement, and should all contain
Lid is within the scope of protection of this application.Therefore, the protection scope of the application should be based on the protection scope of the described claims.
Claims (10)
1. a kind of control method of battery charging and discharging, which is characterized in that specifically includes the following steps:
Detect the state of each battery unit；
According to the state of all battery units, chooses specified several stacks of cells synthesis series circuit and charge/put
Electricity；
According to the current state of all battery units, constantly reconfigure to obtain new series circuit, in new series circuit
Battery unit carry out charge/discharge.
2. the control method of battery charging and discharging as described in claim 1, which is characterized in that when any in charge and discharge process
It carves, by detecting and being calculated the end voltage, electric current, internal resistance, state of charge information data of each battery unit, according to charged
Status data judges the current state of battery unit.
3. the control method of battery charging and discharging as claimed in claim 2, which is characterized in that in charge and discharge process, when charging/
Discharge time reaches designated value, then reconfigure forming new series electrical to battery unit according to battery unit current state
Road.
4. the control method of battery charging and discharging as claimed in claim 3, which is characterized in that carry out charge and discharge tool to battery unit
Body includes following sub-step:
According to the current state of battery unit, several specified battery units are chosen from N number of battery unit, by the battery
Unit accesses circuit and forms series-connected cell group, carries out charge/discharge to the battery unit in series-connected cell group.
5. the control method of battery charging and discharging as claimed in claim 4, which is characterized in that the battery unit is accessed circuit
Form series-connected cell group specifically includes the following steps:
All battery units are ranked up；
According to ranking results, several specified battery units are selected, and are summed to the terminal voltage value of the battery unit,
So that specified range of the summed result without departing from DC bus-bar voltage；
According to selection result, specified several battery units access circuit is formed into series-connected cell group.
6. the control method of battery charging and discharging as claimed in claim 5, which is characterized in that during the charging process, according to sequence
As a result n low battery unit of selection state of charge, so that the sum of end voltage of n battery unit is without departing from DC bus electricity
The specified range of pressure.
7. the control method of battery charging and discharging as claimed in claim 5, which is characterized in that during discharge, according to sequence
As a result the high a battery unit of n ' of selection state of charge, so that the sum of end voltage of a battery unit of n ' is without departing from DC bus
The specified range of voltage.
8. a kind of control system of battery charging and discharging, which is characterized in that specifically include battery pack, detection unit, control unit, energy
Measure converting unit and load；
The wherein tandem tap Ss (i) and paralleling switch Sp (i) in battery pack including battery unit and connection battery unit,
The end voltage of the battery unit is used to meet the demand voltage of load or system；
Detection unit detects and calculates end voltage, electric current, internal resistance, the state of charge information number of each battery unit in battery pack
According to；
Control unit controls battery pack according to the loading demand that the current state of battery unit and energy conversion unit provide
The combination of middle battery；
Energy conversion unit also converts the direct current that the battery pack after combination is exported, and is wanted with the voltage of matched load
It asks.
9. the control system of battery charging and discharging as claimed in claim 8, which is characterized in that one end of tandem tap Ss (i) and
Positive one end of battery unit B (i) connects, and the other end of tandem tap Ss (i) is connected with one end of paralleling switch Sp (i), and
The other end of connection switch Sp (i) is connected with cathode one end of battery unit B (i).
10. the control system of battery charging and discharging as claimed in claim 8, which is characterized in that need to carry out charge or discharge
Corresponding tandem tap Ss (i) closure of battery unit, paralleling switch Sp (i) are disconnected；Otherwise corresponding tandem tap Ss (i) is disconnected
It opens, paralleling switch Sp (i) closure.
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| CN112737015A (en) * | 2020-12-22 | 2021-04-30 | 西安科技大学 | Lithium battery equalization control system and control method based on SOC |
| CN113517745A (en) * | 2021-08-18 | 2021-10-19 | 四川中青轩宇科技有限公司 | Intermittent charging system and method |
| CN113629821A (en) * | 2021-09-02 | 2021-11-09 | 阳光电源股份有限公司 | Energy storage system and control method thereof |
| CN113629822A (en) * | 2021-09-02 | 2021-11-09 | 阳光电源股份有限公司 | Energy storage system and control method thereof |
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