CN108123512A - A kind of detection of Li-ion batteries piles and active balancing charging system - Google Patents
A kind of detection of Li-ion batteries piles and active balancing charging system Download PDFInfo
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- CN108123512A CN108123512A CN201611100444.8A CN201611100444A CN108123512A CN 108123512 A CN108123512 A CN 108123512A CN 201611100444 A CN201611100444 A CN 201611100444A CN 108123512 A CN108123512 A CN 108123512A
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- battery
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- detection
- energy
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
-
- 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
Abstract
The present invention relates to lithium ion batteries, refer specifically to a kind of detection of Li-ion batteries piles and active balancing charging system, limited including series battery, charge power supply, battery voltage sensing module, energy spilling module, main control module, rechargeable energy includes the battery of multiple series connection into control module, switch module, V I modular converters, I V modular converters, analog-digital converter, controller and precision voltage reference device, the series battery；The present invention realizes the online complete equipilibrium of single battery core in battery pack, may also allow for the same capacity battery core and group of different charging and discharging curves；Solving the problems, such as that cell voltage accuracy of detection is poor in battery pack, concatenates point detection line open circuit causes measurement inaccurate；Using the method based on single battery coulometry assessment integral battery door group SOC, and pass through Extended Kalman Filter, coulometry with emf method is combined, realizes the closed loop evaluation of lithium ion battery SOC, is solved the problems, such as inaccurate using battery capacity assessment numerical value.
Description
Technical field
The present invention relates to lithium ion batteries, refer specifically to a kind of detection of Li-ion batteries piles and active balancing charging system.
Background technology
In recent years, with the fast development of lithium ion battery, the continuous of new material comes out and applies, the day of technology
Become ripe and cost decline, possess the lithium ion battery of excellent performance can just substitute completely lead-acid battery become communication or
It is dynamic field high request power solution basis.
The voltage and finite capacity of single accumulator will form series connected battery group to use in many instances.Electric power storage
The problem of electric voltage equalization of pond group is the service life for being related to accumulator group, and the stability of system and the important of security are asked
Topic.Due to single battery degree of aging and difference is affected by temperature, often saves the state of single battery with regard to inconsistent；With charge and discharge
The increase of electric number, the voltage difference between battery can gradually increase, and the imbalance between battery be formed, so as to which battery life be caused to contract
It is short.When battery pack carries out with larger current the electric discharge of a period of time, if the imbalance between battery reaches a certain level, capacity
The polarization reaction generated on minimum single battery can cause the battery pack permanent damage, therefore be put down between single battery
Whether weighing apparatus plays a crucial role for the service life and effect of battery pack.
And existing accumulator group has the following disadvantages：It 1st, can not online management；It 2nd, can not be real-time using periodical management
Management；3rd, the electric discharge that can not be directed to entire accumulator group is managed.It can be seen that the administrative skill of existing accumulator group
Battery tension differentiation caused by Voltage unbalance is not managed effectively, therefore the life of storage battery is subject to strong influence,
Hydraulic performance decline has become uncertain security risk.
Backup type communication is to be cascaded to provide higher voltage by battery with battery.Due between individual cells
Difference and battery work voltage platform limitation, the battery of this series connection needs battery equilibrium and cell safety to protect
To prevent battery premature failure and avoid the occurrence of safety problem.In order to solve the above situation, system need to be provided and a kind of can accurately examined
Survey the scheme of each cell voltage.Existing market has developed many related systems and technology, to solve this kind of requirement, specifically
Mode has following several：
(1) electric resistance partial pressure method：Since measurement device performance limits, the high voltage detected must pass through high-precision this kind of method
Close resitstance voltage divider is depressured to acceptable condition.Voltage more high resistance dividing ratios are bigger in suc scheme, while caused by
Voltage error is also big.Therefore the A/D resolution ratio that sampling is required in high-voltage system is very high, just greatly improves the cost of product
With the realization difficulty of product.
(2) image method in parallel is held, capacitance is connected in parallel on the battery that need to be detected, then disconnects by this method first, system
Realize that cell voltage is tested by testing capacitor voltage, in suc scheme, ceaselessly charge and discharge easily causes quality to be asked to capacitance
Topic, finally affects measurement accuracy, while the excessive circuit that be easy to cause of capacitance is because of overcurrent damage, and capacitance is too small because circuit is discharged
Measurement is caused to drift about.
The prior art mainly includes above-mentioned and otherwise various systems, and there are various limitations in practical applications
Property.There is provided therefore it is a kind of with higher precision, faster measuring speed and lower implementation cost for measuring series connection
The system of cell voltage is necessary.
The content of the invention
For deficiency of the prior art, the present invention is intended to provide a kind of detection of Li-ion batteries piles and active balancing fill
Electric system.
To solve the above problems, the present invention provides following technical scheme：
A kind of detection of Li-ion batteries piles and active balancing charging system, including series battery, charge power supply, battery
Voltage detection module, energy spilling module, main control module, rechargeable energy limit into control module, switch module, V-I modular converters,
I-V modular converters, analog-digital converter, controller and precision voltage reference device, the series battery, charge power supply,
Battery voltage sensing module, energy spilling module, main control module and rechargeable energy limit and collectively form lithium ion into control module
The element cell detection circuit of battery pack；The series battery, switch module, V-I modular converters, I-V modular converters, mould
Number converter, controller and precision voltage reference device collectively constitute the active balancing charging circuit of Li-ion batteries piles；Institute
The series battery stated includes the battery of multiple series connection.
Further, the battery voltage sensing module includes battery voltage detection equal with the number of batteries
Module, each battery voltage detection submodule correspond to a battery and connect；The energy spilling module includes
The energy spilling submodule equal with the number of batteries, each energy spilling submodule correspond to a battery and go here and there
Connection, for monitoring the voltage of battery connected to it；The energy spilling submodule by the electronic switch SW that is connected in series and
Shunting load composition, the rechargeable energy is limited to be connected into control module with one end of the series battery, and described is filled
Electric flux is limited to be connected into control module with the charge power supply, is controlled for the electric current to charge circuit；The master control
Module is limited and is connected into control module with the battery voltage sensing module, energy spilling module, rechargeable energy respectively so that described
Main control module energy spilling submodule and filled according to the voltage condition that the battery voltage monitoring submodule detects to control
Electric flux is limited into control module, and the rechargeable energy is limited includes electronic switch KOC, current-limiting circuit and electronics into control module
Switch KCH, the electronic switch KOC, current-limiting circuit series connection and it is in parallel with the electronic switch KCH.
Further, the switch module includes the first bus B US_A being connected with the anode of any battery, control is appointed
Electronic switch that the anode of one battery is connected with the first bus B US_A is connected the second bus with the cathode of each battery
BUS_B, control any battery cathode and the second bus B US_B connection electronic switch, the first bus B US_A, the
Two lines bus BUS_B is connected with the precision voltage reference device, and the first bus B US_A is filled with the precision voltage reference
The electronic switch S1 that the first bus B US_A is controlled to be connected with the precision voltage reference device is equipped between putting, it is described
It is equipped between second bus B US_B and the precision voltage reference device and controls the second bus B US_B and the accurate electricity
The electronic switch S2 that reference unit is pressed to connect；The first bus B US_A is connected with the anode of the V-I modular converters, institute
The the second bus B US_B stated is connected with the cathode of the V-I modular converters, the electric current of the V-I modular converters output terminal and institute
It is linear to state voltage between the first bus B US_A and the second bus B US_B；The I-V modular converters and institute
The output terminal connection of V-I modular converters is stated, for the current signal of the V-I modular converters output terminal to be converted to linear pass
The voltage signal of system；The output terminal of the I-V modular converters is connected with the analog-digital converter, gathers the voltage letter
Number, and the voltage signal is converted into digital signal；The output terminal of the analog-digital converter is connected with the controller,
The output terminal of the controller is connected with the switch module；So that the controller is used to control switch module, and it is right
The information received from analog-digital converter is processed and displayed.
In addition, integral battery door group SOC is assessed, it can be achieved that product use state and wind using based on single battery coulometry
The assessment of danger.First, according to Bucket Principle, determine series-connected cell pool-size is the battery core appearance of the series unit of lowest capacity
Amount, this item purpose SOC assessments are that the series unit battery core of lowest capacity is selected to be assessed as battery whole group.Secondly, use
Coulomb method carries out SOC and estimates, and since coulomb method is a kind of open-loop prediction, has the advantages that accurately estimate SOC in the short time, but
It is the problem of presence can not determine initial value and increasing cumulative errors, so Evaluation Method need to further optimize, again,
In communication power supply, since system has longer time of repose, the limit of initial value and cumulative errors is carried out using open circuit voltage method
Fixed and preliminary corrections, again, the SOC estimations based on Extended Kalman filter (EKE) algorithm are realized coulomb method and emf method
Organically combine.EKE as a state observer, its significance lies in that：While SOC is calculated with coulomb method, estimation
Go out the voltage Uc (t) on capacitance C, so as to obtain foundation of the estimate of battery terminal voltage as correction SOC；Consider noise simultaneously
With the size of error, determine the filtering gain K (k) of each step, obtain the weight that emf method should be accounted for when calculating SOC, so as to
Obtain the optimal estimation of SOC.Thus coulomb method and emf method are organically combined, coulomb is overcome with emf method
Method has the shortcomings that accumulated error, realizes the closed loop estimation of SOC.Simultaneously as the influence of noise is considered in calculating process,
So algorithm has noise very strong inhibitory action.
Advantageous effect：The active balancing charging circuit of the present invention realizes the online complete equipilibrium of single battery core in battery pack,
It may also allow for the same capacity battery core and group of different charging and discharging curves；The element cell detection circuit of Li-ion batteries piles solves electricity
The problem of cell voltage accuracy of detection is poor in the group of pond, concatenation point detection line open circuit causes measurement inaccurate；Finally, using base
In the method for single battery coulometry assessment integral battery door group SOC, and pass through Extended Kalman Filter, by coulometry and electromotive force
Method is combined, and realizes the closed loop evaluation of lithium ion battery SOC, solves to ask using battery capacity assessment numerical value is inaccurate
Topic.
Description of the drawings
Fig. 1 is the active balancing charging circuit of element cell in Li-ion batteries piles of the invention.
Fig. 2 is the element cell detection circuit in the Li-ion batteries piles of the present invention.
Specific embodiment
Below according to the Figure of description specific embodiment that the present invention will be described in detail：
A kind of detection of Li-ion batteries piles and active balancing charging system, including series battery, charge power supply, battery
Voltage detection module, energy spilling module, main control module, rechargeable energy limit into control module, switch module, V-I modular converters,
I-V modular converters, analog-digital converter, controller and precision voltage reference device, the series battery, charge power supply,
Battery voltage sensing module, energy spilling module, main control module and rechargeable energy limit and collectively form lithium ion into control module
The element cell detection circuit of battery pack；The series battery, switch module, V-I modular converters, I-V modular converters, mould
Number converter, controller and precision voltage reference device collectively constitute the active balancing charging circuit of Li-ion batteries piles；Institute
The series battery stated includes the battery of multiple series connection.
With reference to Fig. 1, the battery voltage sensing module includes battery voltage detection equal with the number of batteries
Module, each battery voltage detection submodule correspond to a battery and connect；The energy spilling module includes
The energy spilling submodule equal with the number of batteries, each energy spilling submodule correspond to a battery and go here and there
Connection, for monitoring the voltage of battery connected to it；The energy spilling submodule by the electronic switch SW that is connected in series and
Shunting load composition, the rechargeable energy is limited to be connected into control module with one end of the series battery, and described is filled
Electric flux is limited to be connected into control module with the charge power supply, is controlled for the electric current to charge circuit；The master control
Module is limited and is connected into control module with the battery voltage sensing module, energy spilling module, rechargeable energy respectively so that described
Main control module energy spilling submodule and filled according to the voltage condition that the battery voltage monitoring submodule detects to control
Electric flux is limited into control module, and the rechargeable energy is limited includes electronic switch KOC, current-limiting circuit and electronics into control module
Switch KCH, the electronic switch KOC, current-limiting circuit series connection and it is in parallel with the electronic switch KCH.
With reference to Fig. 2, the switch module includes the first bus B US_A being connected with the anode of any battery, control is appointed
Electronic switch that the anode of one battery is connected with the first bus B US_A is connected the second bus with the cathode of each battery
BUS_B, control any battery cathode and the second bus B US_B connection electronic switch, the first bus B US_A, the
Two lines bus BUS_B is connected with the precision voltage reference device, and the first bus B US_A is filled with the precision voltage reference
The electronic switch S1 that the first bus B US_A is controlled to be connected with the precision voltage reference device is equipped between putting, it is described
It is equipped between second bus B US_B and the precision voltage reference device and controls the second bus B US_B and the accurate electricity
The electronic switch S2 that reference unit is pressed to connect；The first bus B US_A is connected with the anode of the V-I modular converters, institute
The the second bus B US_B stated is connected with the cathode of the V-I modular converters, the electric current of the V-I modular converters output terminal and institute
It is linear to state voltage between the first bus B US_A and the second bus B US_B；The I-V modular converters and institute
The output terminal connection of V-I modular converters is stated, for the current signal of the V-I modular converters output terminal to be converted to linear pass
The voltage signal of system；The output terminal of the I-V modular converters is connected with the analog-digital converter, gathers the voltage letter
Number, and the voltage signal is converted into digital signal；The output terminal of the analog-digital converter is connected with the controller,
The output terminal of the controller is connected with the switch module；So that the controller is used to control switch module, and it is right
The information received from analog-digital converter is processed and displayed.
In addition, integral battery door group SOC is assessed, it can be achieved that product use state and wind using based on single battery coulometry
The assessment of danger.First, according to Bucket Principle, determine series-connected cell pool-size is the battery core appearance of the series unit of lowest capacity
Amount, this item purpose SOC assessments are that the series unit battery core of lowest capacity is selected to be assessed as battery whole group.Secondly, use
Coulomb method carries out SOC and estimates, and since coulomb method is a kind of open-loop prediction, has the advantages that accurately estimate SOC in the short time, but
It is the problem of presence can not determine initial value and increasing cumulative errors, so Evaluation Method need to further optimize, again,
In communication power supply, since system has longer time of repose, the limit of initial value and cumulative errors is carried out using open circuit voltage method
Fixed and preliminary corrections, again, the SOC estimations based on Extended Kalman filter (EKE) algorithm are realized coulomb method and emf method
Organically combine.EKE as a state observer, its significance lies in that：While SOC is calculated with coulomb method, estimation
Go out the voltage Uc (t) on capacitance C, so as to obtain foundation of the estimate of battery terminal voltage as correction SOC；Consider noise simultaneously
With the size of error, determine the filtering gain K (k) of each step, obtain the weight that emf method should be accounted for when calculating SOC, so as to
Obtain the optimal estimation of SOC.Thus coulomb method and emf method are organically combined, coulomb is overcome with emf method
Method has the shortcomings that accumulated error, realizes the closed loop estimation of SOC.Simultaneously as the influence of noise is considered in calculating process,
So algorithm has noise very strong inhibitory action.
The active balancing charging circuit of the present invention is realized the online complete equipilibrium of single battery core in battery pack, be may also allow for
The same capacity battery core and group of different charging and discharging curves；The element cell detection circuit of Li-ion batteries piles, solves in battery pack
The problem of cell voltage accuracy of detection is poor, concatenation point detection line open circuit causes measurement inaccurate；Finally, using based on monomer
The method of battery coulometry assessment integral battery door group SOC, and pass through Extended Kalman Filter, coulometry is mutually tied with emf method
It closes, realizes the closed loop evaluation of lithium ion battery SOC, solve the problems, such as inaccurate using battery capacity assessment numerical value.
The above described is only a preferred embodiment of the present invention, any limit not is made to the technical scope of the present invention
System, therefore any subtle modifications, equivalent variations and modifications that every technical spirit according to the invention makees above example,
In the range of still falling within technical scheme.
Claims (3)
1. a kind of detection of Li-ion batteries piles and active balancing charging system, it is characterised in that：Including series battery, charge
Power supply, battery voltage sensing module, energy spilling module, main control module, rechargeable energy are limited into control module, switch module, V-I
Modular converter, I-V modular converters, analog-digital converter, controller and precision voltage reference device, the series battery,
Charge power supply, battery voltage sensing module, energy spilling module, main control module and rechargeable energy are limited into the common structure of control module
Into the element cell detection circuit of Li-ion batteries piles；The series battery, switch module, V-I modular converters, I-V turn
The active balancing that mold changing block, analog-digital converter, controller and precision voltage reference device collectively constitute Li-ion batteries piles fills
Circuit；The series battery includes the battery of multiple series connection.
2. a kind of detection of Li-ion batteries piles according to claim 1 and active balancing charging system, it is characterised in that：
The battery voltage sensing module includes the battery voltage detection submodule equal with the number of batteries, each electricity
Cell voltage detection sub-module corresponds to a battery and connects；The energy spilling module includes equal with the number of batteries
Energy spilling submodule, each energy spilling submodule correspond to a battery simultaneously connect, the energy spilling
Module is made of the electronic switch SW being connected in series and shunting load, and the rechargeable energy is limited connects into control module with described
One end connection of battery pack, and the rechargeable energy is limited and is connected into control module with the charge power supply；The master control mould
Block is limited and is connected into control module with the battery voltage sensing module, energy spilling module, rechargeable energy respectively, the charging
Energy is limited includes electronic switch KOC, current-limiting circuit and electronic switch KCH, the electronic switch KOC, limit into control module
Current circuit series connection is simultaneously in parallel with the electronic switch KCH.
3. a kind of detection of Li-ion batteries piles according to claim 1 and active balancing charging system, it is characterised in that：
The switch module includes the first bus B US_A be connected with the anode of any battery, the anode and the of control any battery
The electronic switch of one bus B US_A connections is connected the second bus B US_B, any electricity of control with the cathode of each battery
The electronic switch that the cathode in pond and the second bus B US_B are connected, the first bus B US_A, the second bus B US_B with it is described
Precision voltage reference device connects, and control institute is equipped between the first bus B US_A and the precision voltage reference device
State electronic switch S1, the second bus B US_B and the institute that the first bus B US_A is connected with the precision voltage reference device
State the electricity connected between precision voltage reference device equipped with control the second bus B US_B with the precision voltage reference device
Sub switch S2；The first bus B US_A is connected with the anode of the V-I modular converters, the second bus B US_B with
The cathode connection of the V-I modular converters, the I-V modular converters are connected with the output terminal of the V-I modular converters, described
The output terminals of I-V modular converters be connected with the analog-digital converter, the output terminal of the analog-digital converter with it is described
Controller connects, and the output terminal of the controller is connected with the switch module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611100444.8A CN108123512A (en) | 2016-11-28 | 2016-11-28 | A kind of detection of Li-ion batteries piles and active balancing charging system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611100444.8A CN108123512A (en) | 2016-11-28 | 2016-11-28 | A kind of detection of Li-ion batteries piles and active balancing charging system |
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| CN108123512A true CN108123512A (en) | 2018-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611100444.8A Pending CN108123512A (en) | 2016-11-28 | 2016-11-28 | A kind of detection of Li-ion batteries piles and active balancing charging system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061510A (en) * | 2018-09-18 | 2018-12-21 | 深圳市快车道新能源发展有限公司 | A kind of floated Stringing cells group voltage collection circuit |
-
2016
- 2016-11-28 CN CN201611100444.8A patent/CN108123512A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061510A (en) * | 2018-09-18 | 2018-12-21 | 深圳市快车道新能源发展有限公司 | A kind of floated Stringing cells group voltage collection circuit |
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Application publication date: 20180605 |
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