CN110492555A - A kind of equal balance system and its control method of high capacity cell - Google Patents
A kind of equal balance system and its control method of high capacity cell Download PDFInfo
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- CN110492555A CN110492555A CN201910677986.9A CN201910677986A CN110492555A CN 110492555 A CN110492555 A CN 110492555A CN 201910677986 A CN201910677986 A CN 201910677986A CN 110492555 A CN110492555 A CN 110492555A
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- Prior art keywords
- battery core
- battery
- management system
- contactor
- connect
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Classifications
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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
-
- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
-
- 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
- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- 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
Abstract
The present invention relates to the equal balance systems and its control method of a kind of high capacity cell, the equal balance system includes battery management system, power conversion system and line transfer module, the input terminal of the line conversion switch and the output end of distribution box connect, the output end of line transfer module and the positive and negative anodes of battery core connect, the control terminal of line transfer module is connect with battery management system output end, controls switching of the route conversion module realization to battery core charge and discharge by battery management system；The input terminal of the battery management system and the signal output end of power conversion system connect, and realize the interaction of system operation information；The input terminal of the power conversion system and the output end of distribution box connect.The present invention is by circuit-switched manner, and the battery core for being up to charge and discharge termination condition cuts out charge and discharge electric array, and without auxiliary line, method is simple and effective, solves the problems, such as that large capacity battery core can not be balanced.
Description
Technical field
The present invention relates to technical field of battery balancing, and in particular to a kind of equal balance system and its controlling party of high capacity cell
Method.
Background technique
Battery core consistency problem is always the technical problem for perplexing battery core and using in groups in series and parallel in energy-storage system, although energy
It is enough to will do it consistency matching before battery core is in groups, but battery core performance can generate difference simultaneously with the lasting progress of charge and discharge
Constantly increase, is finally presented as that the consistency of battery system is deteriorated, the charge-discharge performance of battery system deteriorates, and battery system is available
The problems such as capacity is greatly decreased.To reduce influence of the inconsistency to battery system as far as possible, battery equalization system pair need to be passed through
Battery carry out coherency management, alleviate battery because overcharging, system performance degradation problem caused by over-discharge.Battery balanced control system
It is maintained at lithium-ion battery monomer voltage or battery voltage deviation in expected range, to guarantee that each single battery exists
It is normal to keep same state when using, to avoid overcharge, the generation of over-discharge.
Current battery balancing technique mainly uses resistance balanced and charge and discharge balancing two ways, and resistance equilibrium mainly passes through
The mode that every economize on electricity core parallel resistance shunts realizes that because it is passive consuming type, therefore energy consumption and calorific value are larger, are unfavorable for system
Energy and heat management；Charge and discharge balancing is that every economize on electricity core is respectively connected with Balance route route, passes through battery core and balancing battery
It mutually fills and mutually puts battery balanced to achieve the purpose that, though low energy consumption for such mode, the prior art is only supported under low current state
Balanced measure, and the current high capacity cell of energy-storage system is using more and more extensive, operating current can reach hundred amperes of grades, and above-mentioned two
Kind balanced way is not able to satisfy the demand of high capacity cell energy-storage system.
Summary of the invention
The purpose of the present invention is to provide the equal balance systems and its control method of a kind of high capacity cell, pass through circuit switching
Mode, the battery core for being up to charge and discharge termination condition cut out charge and discharge electric array, and without auxiliary line, method is simple and effective,
Solve the problems, such as that large capacity battery core can not be balanced.
To achieve the above object, the invention adopts the following technical scheme:
A kind of equal balance system of high capacity cell, it is characterised in that: turn including battery management system, power conversion system and route
Block is changed the mold, the input terminal of the line conversion switch and the output end of distribution box connect, the output end and electricity of line transfer module
The positive and negative anodes of core connect, and the control terminal of line transfer module is connect with battery management system output end, pass through battery management system
Control switching of the route conversion module realization to battery core charge and discharge；The input terminal and power conversion system of the battery management system
Signal output end connection, realize system operation information interaction；The input terminal of the power conversion system and distribution box it is defeated
Outlet connection.
As a further improvement of the above technical scheme:
The line transfer module uses change-over switch, and the end of incoming cables of the change-over switch and the leading-out terminal of distribution box connect, turn
The leading-out terminal for changing switch is connect with the positive and negative anodes of battery core respectively, and the control terminal of change-over switch is connect with battery management system.
It further include first contactor, one end of the switch of the first contactor and the cathode of battery core connect, the first contact
The switch other end of device is connect with distribution box, and the coil of first contactor and the control terminal of battery management system connect.
It further include second contactor and third contactor, the coil of the second contactor and third contactor is and battery
The control terminal of management system connects, second contactor, third contactor switch one end respectively with the cathode of battery, anode company
It connects, second contactor is connect with the positive and negative electrode of balanced power supply respectively with the switch other end of third contactor.
A kind of balance control method of high capacity cell, comprising the following steps:
When charging, after battery charges to battery core charge cutoff voltage, battery core is cut out by charge sequence by line transfer module, is cut
Out after given time, when battery core current path to charge balancing voltage threshold, the battery core is cut into charge sequence, cell tube
Reason system determines and executes circulate operation, until after battery core voltage is greater than charge balancing voltage threshold in standing given time,
Charging terminates.
As a further improvement of the above technical scheme:
After battery discharge to battery core discharge cut-off voltage, battery core is cut out by Spike train by line transfer module, is cut out set
After time, when battery core voltage recovery to equalization discharge voltage threshold, the battery core is cut into Spike train, battery management system
Automatically circulate operation is determined and executes, until putting standing battery core voltage in given time less than after equalization discharge voltage threshold
Electricity terminates.
The line transfer module uses change-over switch.
When the charging, battery management system is according to contact institute's contact position of conversion module to battery core number in charge sequence
Amount is determined that, when the battery core total quantity that charges is more than or equal to setting value, system is charged with current constant current mode I1；When charging electricity
When core total quantity is less than setting value, system converts continuous current I2 charge mode, wherein I1 > I2.
As shown from the above technical solution, the present invention is up to the battery core of charge and discharge termination condition by circuit-switched manner
Charge and discharge electric array is cut out, without auxiliary line, method is simple and effective, solves the problems, such as that large capacity battery core can not be balanced.
The present invention uses segmented charge and discharge system, and logic judgment and control by battery management system make battery core reach charge and discharge
Continue pulsed charge and discharge cycles after electric cut-off condition, increase the depth of discharge of battery core, improves system capacity effect
Rate.It is poor for battery core consistency, occur electricity or voltage differences problems of too between single battery core during discharge, increases
Dynamic equalization auxiliary circuit carries out auxiliary charging to Spike train single battery core is cut out, guarantees system discharge power stability.
Detailed description of the invention
Fig. 1 is that the system of the first embodiment of the invention is intended to；
Fig. 2 is the system diagram of second of embodiment of the invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing:
As shown in Figure 1, the equal balance system of the high capacity cell of the present embodiment, including battery management system 2, power conversion system 1,
The line transfer module 5 of first contactor 3 and line transfer module 5, the present embodiment uses change-over switch, the inlet wire of change-over switch
End is connect with the leading-out terminal of distribution box 6, and the two-way leading-out terminal of change-over switch is connect with the anode of battery core 5, cathode respectively, and conversion is opened
The control terminal of pass is connect with battery management system 2, is controlled change-over switch by battery management system 2 and is cut to 4 charge and discharge of battery core
It changes.In practical application, can control simultaneously multiple battery cores, the connection type of each battery core 4 is identical.Power conversion system
1 input terminal is connect with the output end of distribution box 6.One end of the switch of first contactor 3 is connect with the cathode of battery core 4, and first
The switch other end of contactor 3 is connect with distribution box 6, and the coil of first contactor 3 and the control terminal of battery management system 2 connect
It connects, the control to first contactor 3 is realized by battery management system 2.
By taking the charging of constant current segmented as an example, system is first with continuous current I when initial charge1Charging, all battery cores are corresponding to be turned
Switch contact is changed in I position of contact.When the voltage V of single battery core 4 is more than or equal to charge cutoff voltage V1When, by battery management
System 2 controls the corresponding change-over switch of battery core 4 and is converted to contact II from contact I, and battery core 4 cuts out charge sequence.Time of repose t1
Afterwards, battery management system 2 carries out voltage value judgement, as battery core voltage is more than or equal to charge balancing voltage V2, then this battery core 4 charges
Terminate；As 4 voltage of battery core is less than charge balancing voltage V2, then battery management system 2 control the corresponding change-over switch of battery core 4 from
Contact II is converted to contact I, and battery core 4 cuts charge sequence.
Battery management system 2 determines 4 quantity of battery core in charge sequence according to contact contact position, when charging battery core
4 total quantity is more than or equal to m1When, system is still with constant current mode I1Charging；When charging 4 total quantity of battery core is less than m2When, system turns
For continuous current I2It charges, wherein I1> I2。
When system switchs to continuous current I2After charging, 4 voltage V of single battery core is more than or equal to charge cutoff voltage V1When, by electricity
Pond management system 2 controls the corresponding change-over switch of battery core 4 and is converted to contact II from contact I, and battery core 4 cuts out charge sequence.It stands
Time t1Battery management system 2 carries out voltage value judgement afterwards, as 4 voltage V of single battery core is more than or equal to charge balancing voltage V2, then
The charging of this battery core 4 terminates；As 4 voltage V of single battery core is less than charge balancing voltage V2, then battery management system 2 controls the battery core 4
Corresponding change-over switch is converted to contact I from contact II, and battery core 4 cuts charge sequence, carries out continuous current I2Charging cycle.
When charge power is less than P3When, 2 control contactor 3 of battery management system cuts off main circuit or is converted to electric discharge mould
Formula, system finishing charging.
By taking the electric discharge of invariable power segmented as an example, system is first with invariable power P when initial discharge1Electric discharge, all battery cores 4 are corresponding to be turned
Switch contact is changed in I position of contact.When 4 voltage of single battery core is less than or equal to discharge cut-off voltage V3When, by battery management system
The 2 control corresponding change-over switch of battery core 4 of system is converted to contact II from contact I, and battery core cuts out Spike train.Time of repose t2It is electric afterwards
Pond management system 2 carries out voltage value judgement, as 4 voltage V of single battery core is less than or equal to equalization discharge voltage V4, then this battery core 4 is put
Electricity terminates；As the voltage V of single battery core 4 is greater than equalization discharge voltage V4, then it is corresponding to control the battery core 4 for battery management system 2
Change-over switch is converted to contact I from contact II, and battery core 4 cuts Spike train.
Battery management system 2 determines according to quantity of the contact contact position to battery core 4 in Spike train, when electric discharge electricity
4 total quantity of core is more than or equal to m2When, system is still with invariable power P1Electric discharge；When electric discharge 4 total quantity of battery core is less than m2When, system switchs to
Invariable power P2It discharges, wherein P1> P2。
When system switchs to invariable power P2After electric discharge, the voltage V of single battery core 4 is less than or equal to discharge cut-off voltage V3When, by electricity
Pond management system 2 controls the corresponding change-over switch of battery core 4 and is converted to contact II from contact I, and battery core 4 cuts out Spike train.It stands
Time t2Battery management system carries out voltage value judgement afterwards, as 4 voltage V of single battery core is less than or equal to equalization discharge voltage V4, then this
The electric discharge of battery core 4 terminates；As the voltage of single battery core 4 is greater than equalization discharge voltage V4, then battery management system 2 controls the battery core 4
Corresponding change-over switch is converted to contact I from contact II, and battery core cuts Spike train, carries out invariable power P2Discharge cycles.
When discharge current is greater than I3When, 2 control contactor 3 of battery management system cuts off main circuit or is converted to charging mould
Formula, system finishing electric discharge.
As shown in Fig. 2, Fig. 2 is second of embodiment of the present embodiment, in the present embodiment, in addition to increasing second contactor
8 and third contactor 3 except, other structures are identical as the first embodiment, the line of second contactor 8 and third contactor 9
Circle is connect with the control terminal of battery management system 2, controls second contactor 8 and third contactor 9 by battery management system 2
Coil cut-off, switch one end of second contactor 8 connect with the cathode of battery core 4, switch one end of third contactor 9 and battery core
4 anode connection, the other end of the switch of second contactor 8 are connected with the cathode of balanced power supply 10, the switch of third contactor 9
The other end is connected with the cathode of balanced power supply 10 respectively.
By taking the electric discharge of invariable power segmented as an example, system is first with invariable power P when initial discharge1Electric discharge, all battery cores 4 are corresponding to be turned
Change switch contact in I position of contact, it is all to be disconnected for battery even contact device.When single battery core voltage is less than or equal to electric discharge
Blanking voltage V3When, the corresponding change-over switch of battery core 4 is controlled by battery management system 2 and is converted to contact II, battery core 4 from contact I
Cut out Spike train standing.Subsequent battery management system 2 opens the positive and negative electrode side contactor of the single battery core 4, with balanced electricity
The connection charging of source 10.Charge to time of repose t2Terminate or when 4 voltage of single battery core is more than or equal to system discharge equal threshold voltage V ',
Battery management system 2 disconnects contactor on the single battery core equalizaing charge route, and equalizaing charge terminates.As there is more piece monomer simultaneously
Battery core 4 is in the standing stage, then successively carries out equalizaing charge by the sequence that single battery core 4 cuts out Spike train.Time of repose arrives
Voltage value judgement is carried out up to rear battery management system 2, as the voltage V of single battery core 4 is less than equalization discharge voltage V4, then cell tube
Reason system 2 controls the corresponding change-over switch of battery core 4 and is converted to contact I from contact II, and battery core cuts Spike train；Such as monomer electricity
The voltage V of core 4 is less than or equal to equalization discharge voltage V4, then this battery core, which enters, waits equalizaing charge sequence, according to battery management system
The battery core that system 2 is made cuts out time judgement and sequentially enters equalizaing charge circulation.
Battery management system 2 determines according to quantity of the contact contact position to battery core 4 in Spike train, when electric discharge electricity
The total quantity of core 4 is more than or equal to m2When, system is still with invariable power P1Electric discharge；When electric discharge battery core total quantity is less than m2When, system switchs to
Invariable power P2It discharges, wherein P1> P2。
When system switchs to invariable power P2After electric discharge, the voltage V of single battery core 4 is less than or equal to discharge cut-off voltage V3When, by electricity
Pond management system 2 controls the corresponding change-over switch of battery core 4 and is converted to contact II from contact I, and battery core 4 cuts out Spike train.It stands
Time t2Battery management system 2 carries out voltage value judgement afterwards, as 4 voltage V of single battery core is less than or equal to equalization discharge voltage V4, then
This battery core 4, which enters, waits equalizaing charge sequence；As the voltage of single battery core 4 is greater than equalization discharge voltage V4, then battery management system
2 control corresponding change-over switch of battery core 3 of system is converted to contact I from contact II, and battery core 4 cuts Spike train, carries out invariable power
P2Discharge cycles.
When discharge current is greater than I3When, 2 control contactor 3 of battery management system cuts off main circuit, system finishing electric discharge.
Embodiment described above only describe the preferred embodiments of the invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made should all be fallen into the protection scope that claims of the present invention determines.
Claims (7)
1. a kind of equal balance system of high capacity cell, it is characterised in that: including battery management system, power conversion system and route
The output end of conversion module, the input terminal of the line conversion switch and distribution box connects, the output end of line transfer module with
The positive and negative anodes of battery core connect, and the control terminal of line transfer module is connect with battery management system output end, pass through battery management system
System control route conversion module realizes the switching to battery core charge and discharge；Input terminal and power the conversion system of the battery management system
The signal output end of system connects, and realizes the interaction of system operation information；The input terminal of the power conversion system and distribution box
Output end connection.
2. the equal balance system of high capacity cell according to claim 1, it is characterised in that: the line transfer module uses
The leading-out terminal of change-over switch, the end of incoming cables of the change-over switch and distribution box connects, the leading-out terminal of change-over switch respectively with battery core
Positive and negative anodes connection, the control terminal of change-over switch connect with battery management system.
3. the equal balance system of high capacity cell according to claim 1, it is characterised in that: it further include first contactor, institute
The cathode of one end and battery core for stating the switch of first contactor connects, and the switch other end of first contactor is connect with distribution box,
The coil of first contactor and the control terminal of battery management system connect.
4. the equal balance system of high capacity cell according to claim 1, it is characterised in that: further include second contactor and
The coil of three contactors, the second contactor and third contactor is connect with the control terminal of battery management system, and second connects
Tentaculum, third contactor switch one end respectively with the cathode of battery, anode connect, second contactor is opened with third contactor
The other end is closed to connect with the positive and negative electrode of balanced power supply respectively.
5. a kind of balance control method of high capacity cell, which comprises the following steps:
When charging, after battery charges to battery core charge cutoff voltage, battery core is cut out by charge sequence by line conversion switch, is cut
Out after given time, when battery core current path to charge balancing voltage threshold, the battery core is cut into charge sequence, cell tube
Reason system determines and executes circulate operation, until after battery core voltage is greater than charge balancing voltage threshold in standing given time,
Charging terminates；When electric, after battery discharge to battery core discharge cut-off voltage, battery core is cut out by electric discharge sequence by line conversion switch
Column, after cutting out given time, when battery core voltage recovery to equalization discharge voltage threshold, the battery core is cut into Spike train,
Battery management system determines automatically and executes circulate operation, until being less than equalization discharge electricity standing battery core voltage in given time
After pressing threshold, electric discharge terminates.
6. the balance control method of high capacity cell according to claim 5, it is characterised in that: the line transfer module
Using change-over switch.
7. the balance control method of high capacity cell according to claim 6, it is characterised in that: when the charging, battery
Management system determines battery core quantity in charge sequence according to contact institute's contact position of change-over switch, when charging battery core is total
When quantity is more than or equal to setting value, system is charged with current constant current mode；When the battery core total quantity that charges is less than setting value, system
Convert constant current charging mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910677986.9A CN110492555A (en) | 2019-07-25 | 2019-07-25 | A kind of equal balance system and its control method of high capacity cell |
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| CN201910677986.9A CN110492555A (en) | 2019-07-25 | 2019-07-25 | A kind of equal balance system and its control method of high capacity cell |
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| WO2023225795A1 (en) * | 2022-05-23 | 2023-11-30 | 宁德时代新能源科技股份有限公司 | Battery cell equalization method and apparatus, electronic device and storage medium |
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Application publication date: 20191122 |