CN110323801A - A kind of energy-storage system battery module equalizing structure and control method - Google Patents
A kind of energy-storage system battery module equalizing structure and control method Download PDFInfo
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- CN110323801A CN110323801A CN201910454543.3A CN201910454543A CN110323801A CN 110323801 A CN110323801 A CN 110323801A CN 201910454543 A CN201910454543 A CN 201910454543A CN 110323801 A CN110323801 A CN 110323801A
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- energy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
-
- 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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- 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
The invention discloses a kind of energy-storage system battery module equalizing structure and control method, the battery module consistency in battery energy storage system can be improved；Normal shock equalizing transform device is used for any monomer transmitting into battery module from energy transfer battery pack by electric energy；Battery voltage acquisition circuit acquires battery terminal voltage, so that estimated battery state is battery balanced to control；Control method determined according to voltage status in battery module require supplementation with and try electric discharge can monomer, then by active combined with passive equilibrium in the way of, to balanced monomer progress charge or discharge is needed in battery module, to realize the equilibrium of battery module.The relatively equalization methods that the present invention uses can be high energy battery electric discharge, be also possible to low energy battery electric energy supplement, therefore balanced way is more flexible, simple and practical, and battery-based voltage is balanced reference, easier and effective relative to SOC balance.
Description
Technical field
The present invention relates to energy storage battery system balanced management control technology fields.
Background technique
Battery energy storage system has been widely used for the links such as transmission of electricity, power generation, distribution and the electricity consumption of electric system, and plays
Important function.Since monomer battery voltage is lower, it is often necessary to it is used in series, and due to battery manufacturing process and use environment
Difference is easy to appear the unbalanced of battery capacity between monomer after long-term use, directly answers battery pack whole volume and power
Characteristic needs to carry out equalization operation to battery pack, makes battery pack whole service life for the unbalanced problem of electricity of battery pack
Extend.
Current circuit of battery pack balancing is broadly divided into two class of energy consumption type and energy transfer.Energy consumption type is balanced
The equalization discharge to energy compared with high monomer is realized using conductive discharge.Energy transfer equilibrium is to realize electric energy by energy transfer
The supplement of lower monomer energy.Both modes, which are used alone, can not make battery in energy storage battery system internal module reach equal
Weighing apparatus.
Summary of the invention
Goal of the invention: a kind of energy-storage system battery module equalizing structure and control method are provided, to solve the above problems.
Technical solution: a kind of energy-storage system battery module equalizing structure, including passive discharge equalizing circuit, voltage acquisition with
Gating circuit, active charge equalizing transform device, energy transfer battery pack, AC/DC charging circuit and control circuit；
Passive discharge equalizing circuit, for high electricity monomer to discharge；
Voltage acquisition and gating circuit realize the selection to monomer in battery module by gating switch, make itself and the active
The output end of charge balancing converter is connected, while voltage collection circuit is realized and adopted to the real-time of battery cell voltage in module
Collection；
Active charge equalizing transform device, the low battery list for selecting electric energy from the energy transfer battery pack to gating switch
The energy transfer of body；
Energy transfer battery pack, it is in series by 4 batteries, for the input of the active charge equalizing transform device, provide electricity
Energy source, while being connected with the output end of the AC/DC charging circuit；
AC/DC charging circuit, input terminal 220V export direct current as energy transfer battery pack charging；
Control circuit determines the monomer for needing to discharge and need to charge according to battery cell voltage collection result, puts if necessary
Electricity just directly discharges to corresponding monomer by resistance；If necessary to charge, just by described in energy transfer battery pack utilization
Active charge equalizing transform device is realized to the monomer charging of gating；Start when the energy transfer battery voltage is lower than 12V
AC/DC converter charges to energy transfer battery pack, stops charging when reaching 15V such as charging.
According to an aspect of the present invention, each battery of the passive discharge equalizing circuit and a controllable switch and
Discharge resistance is in parallel, realizes selectively to turn on the switch by the control circuit and realizes that conductive discharge is balanced.
According to an aspect of the present invention, the voltage acquisition and gating circuit, voltage acquisition is using integrated voltage acquisition
Chip realizes the acquisition to monomer voltage each in module, and gating circuit is realized equal to charge by the control circuit
The gating of the monomer of weighing apparatus.
According to an aspect of the present invention, the active charge equalizing transform device can be forward converter, circuit of reversed excitation,
It can be the isolation DC-DC circuit such as half-bridge, full-bridge.
According to an aspect of the present invention, the energy transfer battery pack is in series by 4 batteries, can be used as actively
The input of charge balancing converter, while being also the output end of AC/DC converter circuit, it both can be used as the realization pair of energy source
The energy supplement of not enough power supply monomer, while can also be supplemented when this group of battery capacity deficiency by AC/DC converter for it
Energy.
The equilibrium of electric discharge, specific steps may be implemented in a kind of energy-storage system battery module balance control method are as follows:
Battery cell voltage in step 1, voltage collection circuit acquisition module calculates average voltage and maximum-minimum voltage difference；
Step 2, when maximum-minimum voltage difference be higher than 100mV when, set the error band of a 20mV；
Step 3, when individual monomers voltage is all on error band, other monomers pass through control circuit control all within error band
Corresponding monomer discharge resistance control switch is made, conductive discharge, while voltage collection circuit are carried out to the monomer for being higher than equal threshold voltage
It monitors cell voltage in real time, and calculates mean value and maximum-minimum voltage difference；
Step 4 stops equalization discharge when maximum-minimum voltage difference is lower than 20mV.
The equilibrium of charging, specific steps also may be implemented in a kind of energy-storage system battery module balance control method are as follows:
Battery cell voltage in step 1, voltage collection circuit acquisition module calculates average voltage and maximum-minimum voltage difference；
Step 2, the error band that a 20mV is set when maximum-minimum voltage difference is higher than 100mV；
Step 3, when individual monomers voltage is all under error band, other monomers pass through control circuit control all within error band
System selects corresponding monomer by gating circuit one by one, using active charge equalizing transform device from energy transfer battery pack to needs
The monomer of electric energy supplement shifts energy；
Step 4 stops equilibrium when being fallen in error band by balanced monomer voltage；
Step 5, to other outside error band battery carry out it is balanced, until the battery of charge balancing in need all terminate to look horizontally
To terminate.
A kind of energy-storage system battery module balance control method can also realize the charging control to energy transfer battery pack
System, specific steps are divided into:
Step 1, the voltage for detecting energy transfer battery pack；
Step 2, when voltage is lower than 12V, AC/DC converter starts charge function, input side 220V, and outlet side current constant control is protected
Demonstrate,prove 2A constant-current charge；
Step 3 stops charging when voltage reaches 15V；
Step 4 does not charge to this group of battery when cell voltage is in 12V-15V.
The utility model has the advantages that the present invention is able to solve in existing technology unbalanced problem in battery module, pass through acquisition electricity
Cell voltage simultaneously carries out simple computation and can realize efficient balance, and two ways monomer higher to electric energy and lower is utilized to carry out
Equilibrium, balanced way is more flexible, simple and practical, helps to promote equalization efficiency；Battery-based voltage is balanced reference,
It is easier and effective relative to SOC balance.
Detailed description of the invention
Fig. 1 is electrical block diagram of the invention.
Specific embodiment
As shown in Figure 1, in this embodiment, a kind of energy-storage system battery module equalizing structure, including passive equalization discharge
Circuit, voltage acquisition and gating circuit, active charge equalizing transform device, energy transfer battery pack, AC/DC charging circuit and control
Circuit processed；
Passive discharge equalizing circuit, each battery are in parallel with a controllable switch and discharge resistance；
Voltage acquisition and gating circuit are connected with the output end of the active charge equalizing transform device, including integrated voltage acquisition
Chip；
Active charge equalizing transform device, can be forward converter, circuit of reversed excitation, be also possible to the isolation DC-DC electricity such as half-bridge, full-bridge
Road；
Energy transfer battery pack, it is in series by 4 batteries, while being connected with the output end of the AC/DC charging circuit；
AC/DC charging circuit, input terminal 220V.
In a further embodiment, the passive discharge equalizing circuit passes through for high electricity monomer to discharge
The control circuit, which is realized selectively to turn on the switch, realizes that conductive discharge is balanced.
In a still further embodiment, the passive discharge equalizing circuit is realized by control circuit and is selectively opened
Switch realizes that conductive discharge is balanced.
In a further embodiment, the voltage acquisition and gating circuit are realized by gating switch in battery module
The selection of monomer, while the voltage collection circuit realizes the real-time acquisition to battery cell voltage in module.
In a still further embodiment, voltage acquisition is realized using integrated voltage acquisition chip to monomer electricity each in module
The acquisition of pressure, gating circuit realize the gating to the monomer for needing to carry out charge balancing by control circuit.
In a further embodiment, the active charge equalizing transform device be used for by electric energy from energy transfer battery pack to
The energy transfer of the low battery monomer of gating switch selection.
In a further embodiment, the energy transfer battery pack is for the defeated of the active charge equalizing transform device
Enter, energy source is provided.
In a still further embodiment, the energy transfer battery pack both can be used as energy source and realize to electricity not
The energy supplement of sufficient monomer, while when this group of battery capacity deficiency energy can also be supplemented for it by AC/DC converter.
In a further embodiment, the AC/DC charging circuit output direct current is energy transfer battery pack charging.
In a further embodiment, the control circuit needs to discharge according to the determination of battery cell voltage collection result
The monomer to charge with needs just directly discharges to corresponding monomer by resistance if necessary to electric discharge；If necessary to charge, just pass through
The energy transfer battery pack is realized using the active charge equalizing transform device to the monomer charging of gating；When the energy turns
It moves starting AC/DC converter when battery voltage is lower than 12V to charge to the energy transfer battery pack, when reaching 15V such as charging
Stop charging.
The equilibrium of electric discharge, specific steps may be implemented in a kind of energy-storage system battery module balance control method are as follows:
Battery cell voltage in step 1, voltage collection circuit acquisition module calculates average voltage and maximum-minimum voltage difference；
Step 2, when maximum-minimum voltage difference be higher than 100mV when, set the error band of a 20mV；
Step 3, when individual monomers voltage is all on error band, other monomers pass through control circuit control all within error band
Corresponding monomer discharge resistance control switch is made, conductive discharge, while voltage collection circuit are carried out to the monomer for being higher than equal threshold voltage
It monitors cell voltage in real time, and calculates mean value and maximum-minimum voltage difference；
Step 4 stops equalization discharge when maximum-minimum voltage difference is lower than 20mV.
The equilibrium of charging, specific steps also may be implemented in a kind of energy-storage system battery module balance control method are as follows:
Battery cell voltage in step 1, voltage collection circuit acquisition module calculates average voltage and maximum-minimum voltage difference；
Step 2, the error band that a 20mV is set when maximum-minimum voltage difference is higher than 100mV；
Step 3, when individual monomers voltage is all under error band, other monomers pass through control circuit control all within error band
System selects corresponding monomer by gating circuit one by one, using active charge equalizing transform device from energy transfer battery pack to needs
The monomer of electric energy supplement shifts energy；
Step 4 stops equilibrium when being fallen in error band by balanced monomer voltage；
Step 5, to other outside error band battery carry out it is balanced, until the battery of charge balancing in need all terminate to look horizontally
To terminate.
A kind of energy-storage system battery module balance control method can also realize the charging control to energy transfer battery pack
System, specific steps are divided into:
Step 1, the voltage for detecting energy transfer battery pack；
Step 2, when voltage is lower than 12V, AC/DC converter starts charge function, input side 220V, and outlet side current constant control is protected
Demonstrate,prove 2A constant-current charge；
Step 3 stops charging when voltage reaches 15V；
Step 4 does not charge to this group of battery when cell voltage is in 12V-15V.
In short, the invention has the following advantages that the existing equalization discharge to energy high monomer, also there is the lower monomer of energy
Charge balancing, flexible structure；A kind of balance control method based on battery cell voltage is given, is directed in battery module not
Balanced uncertainty, efficient balance can be realized by passing through acquisition cell voltage and carrying out simple computation.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
Claims (10)
1. a kind of energy-storage system battery module equalizing structure, which is characterized in that including passive discharge equalizing circuit, voltage acquisition with
Gating circuit, active charge equalizing transform device, energy transfer battery pack, AC/DC charging circuit and control circuit；
Passive discharge equalizing circuit, each battery are in parallel with a controllable switch and discharge resistance；
Voltage acquisition and gating circuit are connected with the output end of the active charge equalizing transform device, including integrated voltage acquisition
Chip；
Active charge equalizing transform device, can be forward converter, circuit of reversed excitation, be also possible to the isolation DC-DC electricity such as half-bridge, full-bridge
Road；
Energy transfer battery pack, it is in series by 4 batteries, while being connected with the output end of the AC/DC charging circuit；
AC/DC charging circuit, input terminal 220V.
2. a kind of energy-storage system battery module equalizing structure according to claim 1, which is characterized in that the passive electric discharge
Equalizing circuit is for discharging high electricity monomer.
3. a kind of energy-storage system battery module equalizing structure according to claim 1, which is characterized in that the voltage acquisition
The selection to monomer in battery module is realized by gating switch with gating circuit, while the voltage collection circuit is realized to mould
The real-time acquisition of battery cell voltage in block.
4. a kind of energy-storage system battery module equalizing structure according to claim 1, which is characterized in that the active charge
The energy transfer for the low battery monomer that equalizing transform device is used to select electric energy from the energy transfer battery pack to gating switch.
5. a kind of energy-storage system battery module equalizing structure according to claim 1, which is characterized in that the energy transfer
Battery pack is used for the input of the active charge equalizing transform device, provides energy source.
6. a kind of energy-storage system battery module equalizing structure according to claim 1, which is characterized in that the AC/DC fills
Electric circuit output direct current is energy transfer battery pack charging.
7. a kind of energy-storage system battery module equalizing structure according to claim 1, which is characterized in that the control electricity
Road determines the monomer for needing to discharge and need to charge according to battery cell voltage collection result, just directly logical if necessary to electric discharge
Resistance is crossed to discharge to corresponding monomer；It is just equal using the active charge by the energy transfer battery pack if necessary to charge
Weighing apparatus converter is realized to the monomer charging of gating；Start AC/DC converter when the energy transfer battery voltage is lower than 12V
It charges to the energy transfer battery pack, stops charging when reaching 15V such as charging.
8. special based on a kind of described in any item control methods of energy-storage system battery module equalizing structure of claim 1 to 7
Sign is, the equilibrium of electric discharge, specific steps may be implemented are as follows:
Battery cell voltage in step 1, voltage collection circuit acquisition module calculates average voltage and maximum-minimum voltage difference；
Step 2, when maximum-minimum voltage difference be higher than 100mV when, set the error band of a 20mV；
Step 3, when individual monomers voltage is all on error band, other monomers pass through control circuit control all within error band
Corresponding monomer discharge resistance control switch is made, conductive discharge, while voltage collection circuit are carried out to the monomer for being higher than equal threshold voltage
It monitors cell voltage in real time, and calculates mean value and maximum-minimum voltage difference；
Step 4 stops equalization discharge when maximum-minimum voltage difference is lower than 20mV.
9. special based on a kind of described in any item control methods of energy-storage system battery module equalizing structure of claim 1 to 7
Sign is, the equilibrium of charging, specific steps also may be implemented are as follows:
Battery cell voltage in step 1, voltage collection circuit acquisition module calculates average voltage and maximum-minimum voltage difference；
Step 2, the error band that a 20mV is set when maximum-minimum voltage difference is higher than 100mV；
Step 3, when individual monomers voltage is all under error band, other monomers pass through control circuit control all within error band
System selects corresponding monomer by gating circuit one by one, using active charge equalizing transform device from energy transfer battery pack to needs
The monomer of electric energy supplement shifts energy；
Step 4 stops equilibrium when being fallen in error band by balanced monomer voltage；
Step 5, to other outside error band battery carry out it is balanced, until the battery of charge balancing in need all terminate to look horizontally
To terminate.
10. based on a kind of described in any item control methods of energy-storage system battery module equalizing structure of claim 1 to 7,
It is characterized in that, can also realize the charge control to energy transfer battery pack, specific steps are as follows:
Step 1, the voltage for detecting energy transfer battery pack；
Step 2, when voltage is lower than 12V, AC/DC converter starts charge function, input side 220V, and outlet side current constant control is protected
Demonstrate,prove 2A constant-current charge；
Step 3 stops charging when voltage reaches 15V；
Step 4 does not charge to this group of battery when cell voltage is in 12V-15V.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111740463A (en) * | 2020-07-01 | 2020-10-02 | 上海电气国轩新能源科技有限公司 | Modular battery equalization system and method |
| CN113783251A (en) * | 2021-08-26 | 2021-12-10 | 四川科陆新能电气有限公司 | Virtual internal resistance adjusting circuit for balancing between battery clusters |
| CN113895233A (en) * | 2019-11-12 | 2022-01-07 | 深圳市道通智能航空技术股份有限公司 | Many battery management device and unmanned aerial vehicle |
| CN114006057A (en) * | 2021-10-22 | 2022-02-01 | 珠海格力电器股份有限公司 | Charging control method, charging control circuit and energy storage system |
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