CN106549454A - A kind of voltage sample and the conllinear battery management system of electric quantity balancing and management method - Google Patents
A kind of voltage sample and the conllinear battery management system of electric quantity balancing and management method Download PDFInfo
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- CN106549454A CN106549454A CN201611162600.3A CN201611162600A CN106549454A CN 106549454 A CN106549454 A CN 106549454A CN 201611162600 A CN201611162600 A CN 201611162600A CN 106549454 A CN106549454 A CN 106549454A
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- voltage
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- 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
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- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of voltage sample and the conllinear battery management system of electric quantity balancing and management method, the method comprising the steps of：The voltage of each cell of step 1. real-time circulation scanning sample set of cells；Step 2. main control module is initiated data syn-chronization according to the specific operation of set of cells and issues calculating equalization instruction；Step 3. from the director data that issued according to the main control module of control module and real-time sampling to voltage carry out the calculating of equilibrium quantity and record；Step 4. judges the electric quantity balancing state of set of cells according to the result of calculation from control module；Step 5. stops voltage scanning sampling, calculates and record battery electric quantity equilibrium locations；Step 6. carries out electric quantity balancing to set of cells according to the electric quantity balancing position of record.The present invention realizes voltage sample and electric quantity balancing simultaneously by a time-sharing multiplex wire harness, has ensured the precision of voltage sample while simplifying wiring saves cost.
Description
Technical field
The present invention relates to battery management system, more particularly to a kind of voltage sample and the conllinear battery management system of electric quantity balancing
System and management method.
Background technology
Monomer voltage sampling is the most basic function of battery management system, battery management system by sampling battery voltage,
Data are analyzed with process, and then realize the defencive function of battery.It can be said that monomer voltage sampling functions are management systems
Basis, most of function of management system are all built upon on this basis.After battery is using a period of time, due to battery
It is inconsistent that manufacture process is produced, and causes battery to produce the inconsistent of dump energy, needs by charge/discharge both of which weighing apparatus side
Formula, releases certain electricity the battery more than electricity, electricity few battery is charged into certain electricity, so that whole group battery is protected
Concordance is held, the utilization rate of battery is improved.
In prior art, the balanced loop that electric quantity balancing need to adopt charge/discharge is carried out to battery, existed in balanced loop equal
Weighing apparatus electric current and loop internal resistance, if voltage sample adopts same wire harness, euqalizing current and loop internal resistance affect with electric quantity balancing
Sampled voltage.
At present, process of the existing products in markets to voltage sample with electric quantity balancing has two ways：1st, voltage sample and electricity
Amount is balanced conllinear, and euqalizing current design is less, and the change in voltage that internal resistance causes is negligible, causes sampled voltage precision up to not
To requiring；2nd, euqalizing current design is larger, and sampled voltage precision is up to standard, but need to use two sets of wire harness, is respectively used to voltage sample
And electric quantity balancing, cause cost to improve wiring complicated.
The content of the invention
The purpose of the present invention is the defect existed for above-mentioned prior art, there is provided a kind of voltage sample is with electric quantity balancing altogether
The battery management system and management method of line.
The battery management system that the voltage sample of present invention offer is conllinear with electric quantity balancing includes：
Sampling module, for the voltage of each cell of real-time circulation scanning sample set of cells；
Control module, for initiating data syn-chronization according to the specific operation of set of cells and issuing calculating equalization instruction data；
From control module, for the director data that issued according to the main control module and real-time sampling to voltage carry out equilibrium quantity
Calculate and record；
Judge module, judges the electric quantity balancing state of set of cells for basis from the result of calculation of control module；
Logging modle, for when battery electric quantity is unbalanced, calculating and recording battery electric quantity equilibrium locations；
Balance module, the electric quantity balancing position for being recorded according to logging modle carry out electric quantity balancing to set of cells.
A voltage difference constant is preset in the judge module, when monomer battery voltage and the difference of set of cells average voltage
When value absolute value is more than predeterminated voltage difference constant, it is judged as that battery electric quantity is unbalanced；Voltage is more than by the logging modle
The cell of set of cells average voltage is recorded as equalization discharge position, and voltage is less than the cell of set of cells average voltage
It is recorded as charge balancing position.
The balance module includes that equalization discharge and charge balancing, the equalization discharge and charge balancing are respectively equipped with
First, the second time threshold, when the equalization discharge time very first time threshold value is reached, stops equalization discharge, when the charge balancing time
When reaching the second time threshold, stop charge balancing.
The voltage sample that the present invention is provided and the conllinear battery management method of electric quantity balancing, comprise the following steps：
The voltage of each cell of step 1. real-time circulation scanning sample set of cells；
Step 2. main control module is initiated data syn-chronization according to the specific operation of set of cells and issues calculating equalization instruction；
Step 3. from the director data that issued according to the main control module of control module and real-time sampling to voltage carry out equilibrium quantity
Calculating and record；
Step 4. judges the electric quantity balancing state of set of cells according to the result of calculation from control module；
Step 5. stops voltage scanning sampling, calculates and record battery electric quantity equilibrium locations；
Step 6. carries out electric quantity balancing to set of cells according to the electric quantity balancing position of record；
After the completion of step 7. electric quantity balancing, return to step 1 continues cycling through the voltage of each cell of scanning sample set of cells.
Judge in the step 4 that the electric quantity balancing state of set of cells includes：A voltage difference constant is preset, when monomer electricity
When the absolute difference of cell voltage and set of cells average voltage is more than predeterminated voltage difference constant, it is judged as that battery electric quantity is uneven
Weighing apparatus.
The unbalanced position of battery electric quantity is recorded in the step 5 to be included：By voltage more than set of cells average voltage
Cell is recorded as equalization discharge position, and cell of the voltage less than set of cells average voltage is recorded as charge balancing position
Put.
In the step 6, the electric quantity balancing includes equalization discharge and charge balancing, the equalization discharge and the charging
Equilibrium is respectively equipped with first, second time threshold, when the equalization discharge time very first time threshold value is reached, stops equalization discharge,
When the charge balancing time the second time threshold is reached, stop charge balancing.
Compared with prior art, the invention has the beneficial effects as follows：Voltage sample and electric quantity balancing share a set of time-sharing multiplex
Wire harness, transmits different signals with the different periods of Same Physical connection, can carry out electric quantity balancing and not affect monomer electricity
The precision of pressure sampling, while simplifying the wiring of vehicle, reduces cost, saves resource.
Description of the drawings
Fig. 1 is cell charge balancing schematic diagram；
Fig. 2 is cell equalization discharge schematic diagram；
Fig. 3 is while balancing principle figure is charged and discharged to cell；
Fig. 4 is the schematic diagram of charge and discharge balancing two adjacent sections battery；
Fig. 5 is the functional block diagram of management system of the present invention；
The step of Fig. 6 is management method of the present invention flow chart.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
It is in battery management system, unbalanced when battery electric quantity is sampled, i.e., each cell dump energy in set of cells
It is inconsistent, and when reaching certain deviation, need to carry out electric quantity balancing to set of cells.Share with electric quantity balancing in voltage sample
In the method for same group of wire, electric quantity balancing is carried out to set of cells and generally comprises following four situation：
Situation 1：Equilibrium is charged for cell.
Fig. 1 is cell charge balancing circuit theory figure.For the cell, when equilibrium is charged, the electricity
Virtual voltage+the Ir+IR1+IR2 of the sampled voltage in the pond=battery, wherein, I is the euqalizing current in balanced loop, and r is the monomer
The internal resistance of battery, R1 and R2 are the internal resistance with two wires in the balanced loop of the cell connection respectively.
Situation 2：Equalization discharge is carried out for cell.
Fig. 2 is cell equalization discharge circuit theory figure.For the cell, when equalization discharge is carried out, the electricity
Virtual voltage-the Ir-IR1-IR2 of the sampled voltage in the pond=battery, wherein, I is the euqalizing current in balanced loop, and r is the monomer
The internal resistance of battery, R1 and R2 are the internal resistance with two wires in the balanced loop of the cell connection respectively.
Situation 3：Equilibrium is charged and discharged for cell simultaneously.
Fig. 3 is to cell while the balanced circuit theory figure of charging and discharging.For the cell, enter at the same time
When row charging and discharging is balanced, the virtual voltage-Ir-IR1-IR2 of the sampled voltage=battery of the battery, wherein, I is electric discharge
The euqalizing current in balanced loop, r are the internal resistances of the cell, and R1 and R2 is the balanced loop with the cell connection respectively
Two wires internal resistance, charge balancing module output current=I+I1, I1 are the electric currents for being divided to charge balancing loop.
Situation 4：Equilibrium is charged and discharged respectively for two adjacent section cells.
Fig. 4 is the schematic diagram of charge and discharge balancing two adjacent sections battery.Wherein, equilibrium is charged to battery BAT1, to electricity
Pond BAT2 carries out equalization discharge.Virtual voltage+the Ir+IR1+IR2+I1R2 of the sampled voltage of battery BAT1=battery BAT1, battery
Virtual voltage-the I1r1-I1R2-I1R3-IR2 of the sampled voltage of BAT2=battery BAT2, wherein, I is BAT1 charge balancings loop
Euqalizing current, I1 is the euqalizing current in BAT2 equalization discharges loop, and r is the internal resistance of battery BAT1, and r1 is the interior of battery BAT2
Resistance, R2 are while connecting the wire internal resistance of battery BAT1 and BAT2, R1 and R3 is to connect battery BAT1 and BAT2 in addition respectively
The internal resistance of two wires.
Several electric quantity balancing situations according to more than, it can be seen that when voltage sample and electric quantity balancing share same group of wire,
When electric quantity balancing is carried out to battery, euqalizing current and wire internal resistance in wire etc. can affect sampled voltage size so as to nothing
Method accurately samples the virtual voltage of battery.
The situation of electric quantity balancing is carried out during based on above-mentioned several voltage samples and conllinear electric quantity balancing to set of cells, is understanding
Certainly balanced loop affects the problem of voltage sample precision, the present invention to propose a kind of voltage sample and the conllinear battery of electric quantity balancing
Management system.
As shown in figure 5, the present invention voltage sample and the conllinear battery management system voltage sample of electric quantity balancing that provide and
The same wire harness of electric quantity balancing sampling, the transmission of Time-sharing control unlike signal are specifically included：Sampling module, main control module, from control mould
Block, judge module, logging modle, balance module.
Sampling module, for the voltage of each cell of real-time circulation scanning sample set of cells.
Control module, for initiating data syn-chronization according to the specific operation of set of cells and issuing calculating equalization instruction data；
From control module, for the director data that issued according to the main control module and real-time sampling to voltage carry out equilibrium quantity
Calculate and record；
Judge module, judges the electric quantity balancing state of set of cells according to the result of calculation from control module, wherein, judge set of cells
Electric quantity balancing state is specially：A voltage difference constant is preset, when the monomer voltage for sampling and set of cells average voltage
When difference is more than default voltage difference constant, then judge that the battery voltage electricity is unbalanced.
Logging modle, for calculating and recording battery electric quantity position in a balanced way.Specially：By the voltage of each cell
It is compared with set of cells average voltage difference, and electricity is carried out to the cell more than or less than predeterminated voltage difference constant
Equilibrium locations are recorded, wherein, voltage is recorded as equalization discharge position more than the cell of set of cells average voltage, and voltage is less than
The cell of set of cells average voltage is recorded as charge balancing position.
Balance module, carries out electric quantity balancing to set of cells according to the electric quantity balancing position of logging modle record.
Sampling module stops scan round sampling electricity immediately after receiving the instruction that the stopping voltage scanning of main control module is sampled
Pond group voltage.Hereafter, main control module sends the instruction of electric quantity balancing to balance module, and balance module is recorded according to logging modle
Electric quantity balancing position carries out electric quantity balancing to set of cells.Specially：First, second is respectively provided with to equalization discharge and charge balancing
Time threshold, carries out equalization discharge to the equalization discharge position of logging modle record, reaches the very first time when the equalization discharge time
During threshold value, stop equalization discharge；Equilibrium is charged to the charge balancing position of logging modle record, is reached when the charge balancing time
During to the second time threshold, stop charge balancing.
After the battery of the electric quantity balancing position of all records completes electric quantity balancing, main control module is sent to sampling module
Instruction, restarts the scan round sampling of battery voltage.
In one embodiment, to stop electric quantity balancing after 200ms, i.e. equilibrium 200ms, equilibrium is completed very first time threshold value
Afterwards, 20ms is waited to make after line loss reply is stable, to restart the scan round sampling of battery voltage.
As shown in fig. 6, the voltage sample proposed by the present invention battery management system conllinear with electric quantity balancing includes when working
Following steps：
The voltage of each cell of step 1. real-time circulation scanning sample set of cells；
Step 2. main control module is initiated data syn-chronization according to the specific operation of set of cells and issues calculating equalization instruction；
Step 3. from the director data that issued according to the main control module of control module and real-time sampling to voltage carry out equilibrium quantity
Calculating and record；
Step 4. judges the electric quantity balancing state of set of cells according to the result of calculation from control module；
Step 5. stops voltage scanning sampling, calculates and record battery electric quantity equilibrium locations；
Step 6. carries out electric quantity balancing to set of cells according to the electric quantity balancing position of record；
After the completion of step 7. electric quantity balancing, return to step 1 continues cycling through the voltage of each cell of scanning sample set of cells.
Wherein, judge in the step 4 that the electric quantity balancing state of set of cells includes：A voltage difference constant is preset, when
When the absolute difference of monomer battery voltage and set of cells average voltage is more than predeterminated voltage difference constant, it is judged as set of cells electricity
Amount is unbalanced；Battery electric quantity is calculated and recorded in the step 5, and position includes in a balanced way：Will be voltage averagely electric more than set of cells
The cell of pressure is recorded as equalization discharge position, and voltage is recorded as charging less than the cell of set of cells average voltage
Weighing apparatus position；In the step 6, the electric quantity balancing includes equalization discharge and charge balancing, the equalization discharge and the charging
Equilibrium is respectively equipped with first, second time threshold, when the equalization discharge time very first time threshold value is reached, stops equalization discharge,
When the charge balancing time the second time threshold is reached, stop charge balancing.
In one embodiment, very first time threshold value be 200ms, i.e. equilibrium 200ms after stop in electric quantity balancing, step 7,
After the completion of weighing apparatus, after waiting 20ms to make line loss reply stable, return to step 1 continues cycling through each cell of scanning sample set of cells
Voltage.
Voltage sample of the present invention adopts time-sharing multiplex wire harness with electric quantity balancing, is passed with the different periods of Same Physical connection
Defeated different signal, reaches multiplex purpose, ensures that monomer voltage is sampled high-precision while reducing wiring cost, letter
Change the wiring of vehicle, save resource.
Above-described embodiment is merely to illustrate the specific embodiment of the present invention.It should be pointed out that general for this area
For logical technical staff, without departing from the inventive concept of the premise, some deformations and change can also be made, these deformation and
Change should all belong to protection scope of the present invention.
Claims (7)
1. a kind of voltage sample and the conllinear battery management system of electric quantity balancing, it is characterised in that include：
Sampling module, for the voltage of each cell of real-time circulation scanning sample set of cells；
Main control module, for initiating data syn-chronization according to the specific operation of set of cells and issuing calculating equalization instruction data；
From control module, for the director data that issued according to the main control module and real-time sampling to voltage carry out equilibrium quantity
Calculate and record；
Judge module, judges the electric quantity balancing state of set of cells for basis from the result of calculation of control module；
Logging modle, for when battery electric quantity is unbalanced, calculating and recording battery electric quantity equilibrium locations；
Balance module, the electric quantity balancing position for being recorded according to logging modle carry out electric quantity balancing to set of cells.
2. the system as claimed in claim 1, it is characterised in that a voltage difference constant is preset in the judge module, when
When the absolute difference of monomer battery voltage and set of cells average voltage is more than predeterminated voltage difference constant, it is judged as set of cells electricity
Amount is unbalanced；Cell of the logging modle by voltage more than set of cells average voltage is recorded as equalization discharge position, will
Voltage is recorded as charge balancing position less than the cell of set of cells average voltage.
3. the system as claimed in claim 1, it is characterised in that the balance module includes equalization discharge and charge balancing, institute
State equalization discharge and charge balancing is respectively equipped with first, second time threshold, very first time threshold value is reached when the equalization discharge time
When, stop equalization discharge, when the charge balancing time the second time threshold is reached, stop charge balancing.
4. a kind of voltage sample and the conllinear battery management method of electric quantity balancing, it is characterised in that comprise the following steps：
The voltage of each cell of step 1. real-time circulation scanning sample set of cells；
Step 2. main control module is initiated data syn-chronization according to the specific operation of set of cells and issues calculating equalization instruction；
Step 3. from the director data that issued according to the main control module of control module and real-time sampling to voltage carry out equilibrium quantity
Calculating and record；
Step 4. judges the electric quantity balancing state of set of cells according to the result of calculation from control module；
Step 5. stops voltage scanning sampling, calculates and record battery electric quantity equilibrium locations；
Step 6. carries out electric quantity balancing to set of cells according to the electric quantity balancing position of record；
After the completion of step 7. electric quantity balancing, return to step 1 continues cycling through the voltage of each cell of scanning sample set of cells.
5. method as claimed in claim 4, it is characterised in that the electric quantity balancing state bag of set of cells is judged in the step 4
Include：A voltage difference constant is preset, when monomer battery voltage with the absolute difference of set of cells average voltage more than default electricity
During pressure difference constant, it is judged as that battery electric quantity is unbalanced.
6. method as claimed in claim 4, it is characterised in that battery electric quantity is calculated and recorded in the step 5 in a balanced way
Position includes：Cell of the voltage more than set of cells average voltage is recorded as into equalization discharge position, voltage is less than into battery
The cell of group average voltage is recorded as charge balancing position.
7. method as claimed in claim 4, it is characterised in that in the step 6, the electric quantity balancing include equalization discharge and
Charge balancing, the equalization discharge and the charge balancing are respectively equipped with first, second time threshold, reach when the equalization discharge time
During to very first time threshold value, stop equalization discharge, when the charge balancing time the second time threshold is reached, stop charge balancing.
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