CN106026256B - A kind of electrical storage device bidirectional equalization system and method - Google Patents

A kind of electrical storage device bidirectional equalization system and method Download PDF

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Publication number
CN106026256B
CN106026256B CN201610465547.8A CN201610465547A CN106026256B CN 106026256 B CN106026256 B CN 106026256B CN 201610465547 A CN201610465547 A CN 201610465547A CN 106026256 B CN106026256 B CN 106026256B
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disconnecting switch
modules
battery modules
battery
electrical storage
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CN201610465547.8A
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CN106026256A (en
Inventor
李军求
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Beijing Institute of Technology BIT
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Beijing Institute of Technology BIT
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014Circuits for equalisation of charge between batteries
    • H02J7/0016Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44Methods for charging or discharging
    • H01M10/441Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014Circuits for equalisation of charge between batteries
    • H02J7/0019Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The present invention relates to a kind of electrical storage device bidirectional equalization system and method, three disconnecting switch, lithium battery charge control module and DC/DC converters are combined based on resistance-type balanced device, with by the amphicheirality of the washability of balanced single battery and balanced energy, purpose is that solve the problems, such as in the prior art can only be unidirectional balanced, it realizes electrical storage device bidirectional equalization, and can be realized in charge balancing from battery modules itself and take electricity or outer low pressure power supply.

Description

A kind of electrical storage device bidirectional equalization system and method
Technical field
This application involves a kind of electrical storage device equilibrium system and method, more particularly to a kind of electrical storage device bidirectional equalization system System and method.
Background technology
Currently, from the point of view of present Research both domestic and external, the difference of energy storage or dissipative cell selected by equalizing circuit, Lithium ion battery balanced device be broadly divided into intrinsically resistance-type balanced device, condenser type balanced device, inductance type balanced device and Transformer type balanced device.Wherein, condenser type balanced device and inductance type balanced device are to carry out equilibrium by the voltage difference of single battery, But due to the voltage difference very little between single battery, the conduction voltage drop of switching device is added, therefore balanced energy is difficult transfer, very It can not extremely shift.And the equalizing circuit of general condenser type and inductance type balanced device is more complicated, parameter chooses relatively difficult, power supply When system configuration difference, needs detailed design and verify circuit parameter, extend the lead time.The shortcomings that transformer type balanced device It is that volume of transformer is big, weight weight, in addition to switching loss, it is also contemplated that transformer loss, with the poor controllability of euqalizing current.Together When, Voltage unbalance caused by transformer leakage inductance makes system control that cannot compensate well.
Resistance equalizer has simple in structure, significant effect and high reliability, but existing switching regulator resistance is equal Weighing apparatus is generally one-way equilibrium, can only be by the energy dissipation of single high-voltage battery, and each battery both ends parallel connection can be by The resistance of switching device control, there are euqalizing currents it is small, complicated, resistive dissipation is difficult the problems such as, simultaneously for less than flat The battery of equal voltage then cannot achieve equilibrium.
Invention content
Purpose of the present invention is to solve the problems, such as in the prior art can only be unidirectional balanced, electrical storage device bidirectional equalization is realized, and It can be realized in charge balancing from battery modules itself and take electricity or outer low pressure power supply.The present invention is with resistance-type balanced device Basis combines lithium battery charge control module and DC/DC converters and multiple disconnecting switch, realizes by balanced single battery The amphicheirality of washability and balanced energy.
The present invention is specially:A kind of electrical storage device bidirectional equalization system, including:
Battery modules are connected by multiple battery cells, and by power supply power supply;
DC/DC modules;
Battery cell is connected by the first disconnecting switch and the second disconnecting switch with load;
First disconnecting switch, selection need balanced battery cell to be connected with the second disconnecting switch;
Second disconnecting switch selects the first disconnecting switch to be connected with one of DC/DC modules and load;
Third disconnecting switch, DC/DC modules pass through the selection of third disconnecting switch and one of battery modules or low-tension supply Connection, third disconnecting switch make low-tension supply be connected with DC/DC modules, and equal balance system is operated in low-tension supply and takes power mode;The Three disconnecting switch make battery modules be connected with DC/DC modules, and equal balance system is operated in itself and takes power mode.
Further, further include integrated chip, the first disconnecting switch, the second disconnecting switch are controlled according to balance policy Or the selection state of third disconnecting switch.
Further, further include charge control module, be arranged between DC/DC modules and the second disconnecting switch, fill Electric control module uses constant current mode, has 1A, 3A and 5A gear current value, integrated chip and charge control module signal Input end signal is connected, and control charge control module selects corresponding gear.
Further, the power supply is low-tension supply, 9~48V of voltage range.
Further, the low-tension supply voltage is 24V.
Further, control terminal, the control terminal or third of the second disconnecting switch of integrated chip and the first disconnecting switch The control terminal of disconnecting switch is connected.
Further, the sensor phase of the integrated chip and electric current in detection battery modules voltage, temperature and circuit Even, the integrated chip includes calculating the calculating part of monomer SOC in battery modules.
The invention further relates to the method for using a kind of above-mentioned electrical storage device bidirectional equalization system,
At the end of battery modules are discharged, control third disconnecting switch makes low-tension supply be connected with DC/DC modules, equilibrium system System is operated in low-tension supply and takes power mode;
When the battery modules phase after charging, control third disconnecting switch makes battery modules be connected with DC/DC modules, balanced System is operated in itself and takes power mode;
When battery modules do not need charge balancing, DC/DC module from service is controlled, while cutting off above two and taking electric mould Formula.
Further, second disconnecting switch selects the first disconnecting switch to be connected with DC/DC modules, then the equilibrium System is charge balancing state;
Second disconnecting switch selects the first disconnecting switch to be connected with load, then the equal balance system is equalization discharge shape State;
Further, electric current in integrated chip detection battery modules voltage, temperature and circuit calculates single in battery modules Body SOC, and be balanced first criterion with monomer battery voltage consistency, to ensure that battery modules can charge normal;When reaching One criterion continues battery modules balanced in conjunction with battery temperature and SOC as balanced Second Criterion.
Description of the drawings
Fig. 1 is principle of the invention structure chart.
Specific implementation mode
As shown in Figure 1, the present invention include battery modules, the first disconnecting switch, the second disconnecting switch, third disconnecting switch, Low-tension supply, DC/DC modules, charge control module, integrated chip and load, load are energy consumption resistances.By above-mentioned three groups every Leave pass, DC/DC modules, charge control module, integrated chip, energy consumption resistance realize battery modules master it is passively balanced.When integrated When chip detects battery modules monomer battery voltage or SOC excessively high, the second disconnecting switch of integrated chip control, which is switched to, puts Power mode, at this time charge control module be stopped, integrated chip controls the first disconnecting switch, the second disconnecting switch, to be discharged Voltage monomer and energy consumption resistance be formed into a loop, realize equalization discharge.
When certain monomer battery voltage in integrated chip detection battery modules or SOC too low, the second disconnecting switch is controlled It is switched to charge mode, charge control module is started to work at this time, and integrated chip controls third disconnecting switch selectively from electricity Pond module or outer low pressure power supply take electricity, and realize that voltage isolation, charged control module generate constant electricity by DC/DC modules Stream, the first disconnecting switch controls battery cell to be charged and connect with the second disconnecting switch, at this time the first disconnecting switch, second every Pass, voltage monomer to be discharged and battery modules or outer low pressure power supply forming circuit are left, realizes charge balancing.
Battery modules charge balancing selectively can take electricity either outer low pressure power supply or same from battery modules itself When cut off above two powering mode.Its selection method:By integrated chip control third disconnecting switch work selection external electricity Pattern or battery modules itself take power mode.Specifically, when needing equilibrium at the end of battery modules are discharged, battery modules at this time SOC is relatively low, and monomer battery voltage is generally all low in battery modules, is disconnected and electricity by integrated chip control third disconnecting switch at this time The connection of pond module is simultaneously connect with low-tension supply, and then is operated in external electricity pattern.When the battery modules phase after charging, electricity Monomer battery voltage is generally all higher in the module of pond, is disconnected and low-tension supply by integrated chip control third disconnecting switch at this time It connects and is connect with battery modules, and then be operated in itself and take power mode;When battery modules do not need charge balancing, then by integrating Chip cuts off above two powering mode simultaneously, and DC/DC modules and charge control module do not work at this time, saves energy consumption,
DC/DC modules are isolated using voltage, realize that arbitrary monomer equalizaing charge passes through battery modules itself in battery modules Electricity or outer low pressure is taken to take electricity, while its module input voltage range meets battery modules, outer low pressure supply voltage simultaneously Area requirement, it is stable voltage, preferably 24V preferably to take 9~48V, output;
Charge control module preferably uses constant current mode, and electric current is preferably 5A, can set different gear current values, Preferably 1A, 3A and 5A, and corresponding gear is selected according to balance policy by integrated chip.
Second disconnecting switch has 2 kinds of on-states, i.e. charge balancing state or equalization discharge state, wherein charging is equal The second disconnecting switch connects charge control module when weighing apparatus state, and the second disconnecting switch connects resistance when equalization discharge state, by collecting Working condition is connected according to the second disconnecting switch of battery balanced policy control at chip.
First disconnecting switch is used to select that balanced battery cell to be needed with the second disconnecting switch to be connected, and by integrated chip Balanced battery cell is needed according to balance policy is selected;
Integrated chip detects electric current in battery modules voltage, temperature and circuit, obtains monomer SOC in battery modules, and with Monomer battery voltage consistency is balanced first criterion, to ensure that battery modules can charge normal;When reaching the first criterion, in conjunction with Battery temperature and SOC continue equilibrium as balanced Second Criterion to battery modules, to reach the mesh for improving battery 's.

Claims (8)

1. a kind of electrical storage device bidirectional equalization system, including:
Battery modules are connected by multiple battery cells, and by power supply power supply;
DC/DC modules;
It is characterized in that:
Battery cell is connected by the first disconnecting switch and the second disconnecting switch with load;
First disconnecting switch, selection need balanced battery cell to be connected with the second disconnecting switch;
Second disconnecting switch selects the first disconnecting switch to be connected with one of DC/DC modules and load;
Third disconnecting switch, DC/DC modules select to connect with one of battery modules or low-tension supply by third disconnecting switch, Third disconnecting switch makes low-tension supply be connected with DC/DC modules, and equal balance system is operated in low-tension supply and takes power mode;Third is isolated Switch makes battery modules be connected with DC/DC modules, and equal balance system is operated in itself and takes power mode;
At the end of battery modules are discharged, control third disconnecting switch makes low-tension supply be connected with DC/DC modules, equal balance system work Make to take power mode in low-tension supply;
When the battery modules phase after charging, control third disconnecting switch makes battery modules be connected with DC/DC modules, equal balance system It is operated in itself and takes power mode;
Electric current in integrated chip detection battery modules voltage, temperature and circuit, calculates monomer SOC in battery modules, and with monomer Cell voltage consistency is balanced first criterion, to ensure that battery modules can charge normal;When reaching the first criterion, in conjunction with battery Temperature and SOC continue battery modules balanced as balanced Second Criterion.
2. a kind of electrical storage device bidirectional equalization system as described in claim 1, it is characterised in that:Further include integrated chip, The first disconnecting switch, the selection state of the second disconnecting switch or third disconnecting switch are controlled according to balance policy.
3. a kind of electrical storage device bidirectional equalization system as claimed in claim 2, it is characterised in that:It further include charge control mould Block is arranged between DC/DC modules and the second disconnecting switch, and charge control module uses constant current mode, has 1A, 3A With 5A gear current values, integrated chip is connected with charge control module signal, and control charge control module selects corresponding gear.
4. a kind of electrical storage device bidirectional equalization system as described in claim 1, it is characterised in that:The power supply is low tension Source, 9~48V of voltage range.
5. a kind of electrical storage device bidirectional equalization system as described in claim 1, it is characterised in that:Integrated chip is isolated with first The control terminal of the control terminal of switch, the control terminal of the second disconnecting switch or third disconnecting switch is connected.
6. a kind of electrical storage device bidirectional equalization system as claimed in claim 2, it is characterised in that:The integrated chip and detection The sensor of electric current is connected in battery modules voltage, temperature and circuit, and the integrated chip includes calculating monomer in battery modules The calculating part of SOC.
7. using a kind of method of electrical storage device bidirectional equalization system as claimed in any one of claims 1 to 6, it is characterised in that:
When battery modules do not need charge balancing, DC/DC module from service is controlled, while cutting off above two and taking power mode.
8. the method for claim 7, it is characterised in that:
Second disconnecting switch selects the first disconnecting switch to be connected with DC/DC modules, then the equal balance system is charge balancing State
Second disconnecting switch selects the first disconnecting switch to be connected with load, then the equal balance system is equalization discharge state.
CN201610465547.8A 2016-06-23 2016-06-23 A kind of electrical storage device bidirectional equalization system and method Active CN106026256B (en)

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CN107171032A (en) * 2017-04-25 2017-09-15 深圳市海云图新能源有限公司 A kind of lithium battery group protects system
CN108016309B (en) * 2017-11-24 2020-11-13 安徽特凯新能源科技有限公司 Battery management system for improving battery endurance

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CN101882699B (en) * 2010-06-28 2012-12-05 惠州市亿能电子有限公司 Charge and discharge balancing control method for power battery pack
CN103208827A (en) * 2012-01-17 2013-07-17 中国科学院广州能源研究所 Balance control system and method for high-capacity serial connected battery packs
CN202840594U (en) * 2012-09-04 2013-03-27 嘉兴敏凯汽车零部件有限公司 Electric vehicle power lithium battery energy balancing system
CN102969772B (en) * 2012-12-12 2015-08-05 山东省科学院自动化研究所 Based on definitely can the full stage dynamic lithium battery equalization methods of dischargeable capacity and device
CN203135473U (en) * 2012-12-20 2013-08-14 中国东方电气集团有限公司 Non-energy consumption battery charge equalizing apparatus
CN103326439B (en) * 2013-06-28 2016-11-02 安科智慧城市技术(中国)有限公司 The equalizing circuit of set of cells and method
CN103915877B (en) * 2014-04-23 2017-04-12 华南师范大学 Balance control management system and balance control method of lithium-ion power battery pack
CN205791695U (en) * 2016-06-23 2016-12-07 南京绿水湾汽车科技有限公司 A kind of electrical storage device bidirectional equalization system

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