CN105024411B - A kind of intelligent power lithium ion battery management system and its charge control method - Google Patents
A kind of intelligent power lithium ion battery management system and its charge control method Download PDFInfo
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Abstract
The present invention relates to a kind of intelligent power lithium ion battery management system, including micro controller module and connected acquisition module, memory module, security protection module, communication module, charge and discharge control module, balanced management module；Its charging method includes：According to information such as the monomer battery voltage that acquisition module is collected, assembled battery total voltage, temperature, electric currents, judge whether battery allows to charge；As allowed, then battery management system automatically adjusts the charge mode to set of cells；The output current that balanced power module is automatically adjusted by CAN communication, the cell relatively low to voltage carry out equalizaing charge, till the pressure reduction of all cells is respectively less than threshold value.The present invention can automatically select charging modes, Auto-matching charging current according to set of cells data message, and there is charging protection function, it is possible to increase the charge efficiency of set of cells, extend battery cyclic service life.
Description
Technical field
The invention belongs to power battery management system field, specifically a kind of battery management of power lithium-ion battery
System and its charge control method.
Background technology
With electric motor car, the development of hybrid power instrument, various electrokinetic cells are used widely.Lithium battery is with its volume
Little, self-discharge rate is low, and energy density is high, the advantages of service life cycle is long, becomes most promising electrokinetic cell.But lithium is electric
Pond security and stability is not high, overcharge, overdischarge all can be damaged to lithium ion battery, so for ensureing lithium ion battery
Trouble free service, it is necessary to be equipped with high performance battery management system.
Existing lithium battery management system, charging strategy are single, adopt constant-current charge, it is impossible to close according to the characteristic of battery more
Reason charges, and often charge efficiency is not high and easily lithium ion battery is damaged, and shortens its service life.While most of lithiums
, using passive balanced way in a balanced way, equalization efficiency is low, and is easily caused thermal management issues for battery management system.
Content of the invention
It is an object of the present invention to provide a kind of stable performance, low cost, small power consumption, the intelligence that charge efficiency is high, portfolio effect is good
Motility lithium ion battery management system, to overcome the defect of above-mentioned battery management system.
The technical scheme that adopted for achieving the above object of the present invention is：A kind of intelligent power lithium ion battery management system
System, including：Micro controller module and connected acquisition module, memory module, security protection module, communication module, fill
Control of discharge module, balanced management module；Acquisition module, charge and discharge control module, balanced management module are used for connecting battery list
Unit；
Micro controller module：Charge and discharge control module, safeguard protection mould are controlled according to the battery data information of acquisition module
Block and balanced management module, and battery data information and status information are sent to peripheral equipment control by communication module
Device, and store memory module；
Charge and discharge control module：For connecting battery unit, and the charge and discharge process to set of cells is managed, and it is right to realize
The automatic charging of lithium battery group；
Balanced management module：For reducing the difference between cell capacity in set of cells charging process, and realize
Automatically error detection with automatically configure euqalizing current.
The outfan of the charge and discharge control module and the outfan of security protection module respectively be input into the two of door
End connection, is connected with the G poles of field effect transistor N1, field effect transistor N2 with gate output terminal, the D poles of field effect transistor N1, N2 and relay
Connect through the negative pole of current sensor, fuse and battery unit after one end connection of N3 successively, the S poles of field effect transistor N1, N2
It is connected with charger negative pole after parallel connection, the positive pole of charger is connected with the positive pole of battery unit；The other end of relay N3 passes through
Load is connected with the positive pole of battery unit, and control end is connected with micro controller module, and charger is by CAN and communication module
Connection, also by each the cell both positive and negative polarity for the balanced power module, balanced management module and battery unit being sequentially connected
Connection.
The balanced management module includes that multiple diodes and switch arrays, switch arrays are used for controlling each monomer electricity
The equalizaing charge in pond is opened and closed, including multiple switch；After each cell both positive and negative polarity difference series diode, switch,
Connect with the positive-negative output end of balanced power module.
A kind of charge control method of intelligent power lithium ion battery management system, comprises the following steps：
According to the monomer battery voltage that acquisition module is collected, assembled battery total voltage, temperature and total current, judge whether into
Row charge protection；If desired protection is charged, then disconnects field effect transistor N1 and field effect transistor N2, while prohibiting by CAN communication
Only charger and balanced power module output；
If protection need not be charged, pre-charging stage is entered, if cell meets in pre-charging stage
The condition that weighing apparatus is opened, then carry out equalizaing charge, at the same micro controller module by CAN communication control balanced power module connection after
Electrical equipment N5, closes relay N4, relay N6, and balanced power module is exported with 5V/3A；If being unsatisfactory for, next step is executed；
The quick charge stage is entered, if cell meets the balanced condition that opens in the quick charge stage, is carried out
Equalizaing charge, while micro controller module controls balanced power module by CAN communication connects N6, closes N4 and N5, balanced electricity
Source module is exported with 5V/5A；If being unsatisfactory for, next step is executed；
The saturation charging stage is entered, if cell meets the balanced condition that opens in the saturation charging stage, is carried out
Equalizaing charge, while micro controller module controls balanced power module by CAN communication connects N4, closes N5 and N6, balanced electricity
Source is exported with 5V/1A；If being unsatisfactory for, next step is executed；
The boost charge stage is entered, in the boost charge stage, is controlled by balanced management module and switch and CAN communication
Weighing apparatus module is charged to every cell successively, until all cells reach charge cutoff voltage Vsstop, is tied
Beam charges, and closes all switches of balanced management module, and controls balanced power module closing relay by CAN communication
N5、N4、N6.
The charge protection that judges whether to is specially：Then think when there are following situations that needs are charged protection,
Protection need not be otherwise charged：
Acquisition module is collected in the continuous 5s of battery pack temperature higher or lower than limit value；
The continuous 2s of assembled battery total voltage is higher than limit value, or the continuous 2s of any one monomer battery voltage is above limit value；
Set of cells is communicated after success with charger, if set of cells sends charge request, continuous 10s acquisition modules are not detected by
Charging current, or set of cells do not send charge request, continuous 10s acquisition modules detect charging current more than 2A.
The precharge is comprised the following steps：
If assembled battery total voltage is less than precharge cell group total voltage limit value Vtpre or any one monomer battery voltage
Less than precharge monomer battery voltage limit value Vspre, micro controller module control field effect transistor N1 and the conducting of field effect transistor N2, lead to
Cross CAN communication charger is adjusted with 0.05C constant current outputs.
The quick charge is comprised the following steps：
When assembled battery total voltage is more than threshold value Vspeed, micro controller module controls field effect transistor N1 and field effect transistor N2
Conducting, adjusts charger with 0.5C constant current outputs by CAN communication.
The saturation charges and comprises the following steps：
When assembled battery total voltage be more than threshold value Vsatura when, micro controller module by CAN communication regulation charger with
0.2C constant current outputs, until assembled battery total voltage reaches charge cutoff voltage Vtstop or monomer battery voltage reaches charge cutoff
Voltage Vsstop, disconnects field effect transistor N1 and field effect transistor N2, controls charger by CAN communication and forbids that charger is exported.
The boost charge is comprised the following steps：
Boost charge is carried out to every cell successively, i.e., balanced power module is controlled by CAN communication and is connected relay
Device N5, closes relay N4 and N6, controls balanced management module（8）Variable connector, open the equal of each cell successively
Weigh path, and so far monomer battery voltage reaches threshold voltage Vsstop.
The balanced condition opened is：After judging battery unit fault-free, voltage highest cell and voltage are most
The voltage difference of low cell opens limit value Udva more than balanced.Specially：According to the monomer electricity that acquisition module is collected
Cell voltage, judges battery unit whether failure；Such as fault-free, then when the monomer electricity that voltage highest cell and voltage are minimum
The voltage difference in pond opens limit value Udva more than balanced, then enter equalizaing charge；Such as faulty, then equalizaing charge is not entered, with
When micro controller module balanced power module controlled by CAN communication close relay N4, N5 and N6.
The equalizaing charge is specially：The battery unit minimum to voltage is charged, and the charging according to residing for battery
In the stage, the output current for adjusting balanced power module by CAN communication, until the pressure reduction of all cells is respectively less than threshold value
Till Udvb.
The invention has the advantages that and advantage：
1. the present invention is centralized battery management system, and with small volume, stable performance, acquisition precision are high, and low cost can
The features such as leaning on property strong.
2. the Li-ion Battery Management System of the present invention, is filled with CAN communication network and with reference to battery behavior
Electric control, can automatically select charging modes, Auto-matching charging current according to set of cells data message, and there is charge protection
Function, it is possible to increase the charge efficiency of set of cells, extends battery cyclic service life.
3. the present invention provides a kind of equalizaing charge control mode, is communicated with balanced power module by CAN communication network, root
According to set of cells data message automatic and closing equalizaing charge, balanced electricity can be automatically configured in the set of cells different charging stage
Stream, and after main charging terminates, boost charge is carried out to every cell successively, capacity between cell is improve consistent
Property.
4. the present invention provides a kind of balanced power module, can adjust output current by CAN communication, be battery pack balancing
Charge and regulated power supply is provided.
Description of the drawings
Fig. 1 is the intelligent power lithium ion battery management system frame diagram of the present invention.
Fig. 2 is charge and discharge control module principle schematic diagram.
Fig. 3 is balanced power module principle schematic.
Fig. 4 is balanced management module principle schematic diagram.
Fig. 5 is charge control algorithm flow chart.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention is described in further detail.
The invention provides a kind of intelligent power lithium ion battery management system, which includes micro controller module 1, power supply mould
Block 7, acquisition module 2, charge and discharge control module 6, security protection module 4, communication module 5, memory module 3 and balanced management module
8.The battery management system can to lithium battery voltage, temperature, electric current and battery charge state (abbreviation SOC) real-time monitoring and
Management, carries out charging controller with CAN communication network to set of cells, i.e., automatically adjusts charging according to set of cells data message
Pattern, the cell poor to Capacity uniformity carry out balanced management, automatically configure equalizaing charge electric current, improve lithium battery
Capacity uniformity.The battery management system can improve the charge efficiency of battery, increase the service life, it is ensured that set of cells safety,
Stable operation.
As shown in figure 1, the power module 7 of the present invention respectively with acquisition module 2, micro controller module 1, communication module 5, deposit
Storage module 3, security protection module 4 connect, there is provided 5 module running voltages, it is ensured that battery management system normal work.
The acquisition module 2 is used for the detection of monomer battery voltage, assembled battery total voltage, total current and temperature；By temperature
Degree, total voltage, monomer battery voltage, total current and euqalizing current Acquisition Circuit composition.Acquisition Circuit is by differential operational amplifier
Constitute with divider resistance, temperature sensor adopts critesistor, the current sensor needed for total current collection to adopt precision resistance,
Current sensor needed for euqalizing current collection adopts Hall current sensor.
The micro controller module 1 is the nucleus module of whole system, and it receives the data message of collection, and is located
Reason；Corresponding logical operationss are carried out according to the data message for obtaining, SOC, control security protection module 4, balanced management mould is estimated
Block 8, charge and discharge control module 6, by the data message of collection, system status information and fault message write memory module 3, and
By communication module 5 and external equipment（Such as entire car controller）Interact.
The charge and discharge control module 6 is used for being managed the charge and discharge process of set of cells, realizes to lithium battery group
Intelligent automatic charging.Be made up of charging control circuit and charge/discharge control circuit, charge and discharge process by microprocessor module control,
The charge control of set of cells is charged and boost charge control by stages, and is filled with balanced using precharge, quick charge, saturation
Fulgurite reason combines, and battery management system can automatically configure charging modes according to set of cells data message, and pass through CAN communication
Network is communicated with charger and balanced power module, automatically configures charging current and euqalizing current.
The security protection module 4 is used for the fault detect to battery management system and set of cells, to prevent security incident
Generation.The signal that microprocessor judges occur to export during potential safety hazard is received, and protection control signal is enabled by grade, is produced phase
The protection act that answers.
The communication module 5, receives the information that micro controller module is sent, and is sent to external communications equipment, while connecing
The command information that external communications equipment is sent is received, micro controller module process is forwarded to.
The memory module 3 belongs to non-volatile memory module, is connected with microprocessor module 1, can carry out non-volatile
Property storage read-write, storage speed is fast, and the data message of lithium battery management system and status information can be stored, and
In the case of management system power down, storage information will not be lost, and can be believed with the data of permanent storage lithium ion battery management system
Breath.
The balanced management module 8 is used in set of cells charging process reducing the diversity factor between cell capacity, and
There is automatic error detection and automatically configure euqalizing current function.Be made up of multiple identical switch arrays, with very strong can
Transplantability.Balanced management module switch array one end is connected with balanced power module, and the other end is connected with cell, and each is opened
Array is closed by micro controller module control.When certain battery unit reaches balanced opening, corresponding switch arrays are beaten
Open, this cell is charged.
The balanced power module, by CAN communication module, MCU module, 3 power transfer modules, multiple switch and two grades
Pipe is constituted, and can be communicated with battery management system, according to the instruction of battery management system, carry out corresponding action, be equal
Weighing apparatus management module provides required input power.
As shown in Fig. 2 charge and discharge control module 6 of the present invention is by CAN communication and charger and balanced power module 8
Connection；The charge protection signal for starting charging protecting module in charging signals and security protection module 4 of charge and discharge control module 6
By being connected with the G poles of field effect transistor N1 and N2 with door, the control end of relay N3 and battery management system micro controller module 1
It is connected, connects through the negative pole of current sensor, fuse and battery unit after one end parallel connection of the D poles of N1, N2 and N3 successively；?
It is connected with charger negative pole end after the S of effect pipe N1, N2 extremely parallel connections, the other end of field effect transistor N3 is connected with load, set of cells
Anode be connected as charging port and charger and load, if after set of cells starts and charges, the control charging of micro controller module 1
Control module 6 is exported so that N1 is connected with N2, and relay N3 disconnects, if after set of cells star t-up discharge, micro controller module 1 is controlled
Charge and discharge control module 6 processed is exported so that N1 and N2 disconnects, and relay N3 is connected.
Security protection module 4 proposed by the invention mainly realizes battery system overcharge, overdischarge, overtemperature, low temperature, mistake
A series of defencive functions such as stream, balanced failure, fuse failure, it is ensured that set of cells safely and steadily runs.According to battery management
The failure of system detectio carries out staged care, the protection of safety protection module to the significance level and safe coefficient of system operation
Function is divided into three-level protective, and the first order is protected as slight extent, alarm；Protect as the order of severity, alarm the second level
And related work circuit is disconnected, stop corresponding relevant action；Third level protection is protected for fuse, cuts off total out-put supply.
All control signals by microcontroller according to process after data message carry out logical judgment after send.
Communication module 5 proposed by the invention, using CAN communication network and charger, balanced power module and outside
Device talk, realizes the interaction of charge control, Balance route and outbound data.
As shown in figure 4, balanced management module (8) proposed by the invention is made up of variable connector selection circuit, first
Cell both positive and negative polarity is connected with switch S1 and S2 after sealing in diode D7 and D8 respectively, the other end of S1 and S2 respectively with balanced
The both positive and negative polarity connection of power supply, the in the same manner equalizing circuit of other monomers battery method connection also described above.If starting to a certain Zhi Dan
The equalizaing charge of body battery, then close two switches of this balanced branch road, simultaneously close off the switch of other all branch roads.
Balanced power module proposed by the invention is as shown in figure 3, including MCU module U1, CAN communication module U2, P1
(5V/1A), P2 (5V/3A), P3 (5V/5A) power transfer module, switch（Relay）N4, N5, N6, and diode D1, D2,
D3, D4, D5, D6 are constituted；CAN communication module (U2) is connected with the communication module 5 of battery management system, for balanced power module
Receive control instruction and return implementing result；MCU module (U1) is connected by serial port communication line with CAN communication module (U2)；Switch
N4 control ends and MCU module (U1) are electrically connected with, and another two ends be connecteds with the positive pole of D1 positive poles and P1 respectively, switch N5 control ends and
MCU module (U1) is electrically connected with, and another two ends are connected with the positive pole of D3 positive poles and P2 respectively, switchs N6 control ends and MCU module
(U1) it is electrically connected with, another two ends are connected with the positive pole of D5 positive poles and P3 respectively, the negative pole end parallel connection conduct of diode D1, D3 and D5
The positive terminal of balanced power module.The negative pole end of D2 is connected with P1 negative pole ends, and the negative pole end of D4 is connected with P2 negative pole ends, and D6's is negative
Extremely it is connected with P3 negative pole ends, the positive terminal of D2, the D4 and D6 negative pole end as equilibrium power module in parallel.MCU module (U1)
By CAN communication module (U2), receive the instruction that sends from battery management system, further according to instruction, by controlling switch N1,
N2 and N3, selects P1, P2 to connect with the one of power modules of P3, or Close All, requires output according to communications protocol
Corresponding current/voltage, and after output is connected, normally output refers to return balanced power supply by CAN communication to battery management system
Order.
By mechanical contact, Balance route algorithm proposed by the invention, battery management system detect that balanced power module is
No connection, if balanced power module connection, in order to ensure that the safety of equalizaing charge, battery management system carry out self-inspection in real time,
Even balanced unlatching, is not detected by euqalizing current in the continuous 5s of battery management system, or equilibrium is not opened, battery management system
Euqalizing current is detected in continuous 5s, then equalizaing charge protection, close the multidiameter option switch of all balanced management modules 8, led to
Cross the output that CAN communication forbids balanced power module 8.If balanced self-inspection equalizaing charge fault-free, equalizaing charge control is entered
Algorithm, according to the monomer battery voltage that acquisition module 2 is collected, finds the minimum list of voltage highest cell and voltage
Body battery, if the voltage difference of two cells opens limit value Udva more than balanced, starts to the relatively low monomer electricity of voltage
The equalizaing charge in pond, i.e., by connecting the switch on this cell equilibrium branch road, carry out equalizaing charge to which, and pass through
CAN communication adjusts the output current of balanced power module, until the pressure reduction of all cells is respectively less than balanced outage threshold
Udvb, closes the switch of all balanced branch roads.
As shown in figure 5, a kind of Intelligent power lithium battery group charge control algorithm proposed by the invention includes being pre-charged, soon
Speed charges, and saturation charges and boost charge.In precharge, quick charge, saturation charging stage, power lithium-ion battery management system
System carries out balanced management simultaneously according to monomer battery voltage information.Precharge mode, 10min is adopted when battery voltage is relatively low
After switch to fast charge mode, when set of cells is charged to latter stage, i.e., when battery voltage reaches certain value, proceed to saturation charging,
Equalizaing charge can start under three above charge mode, respectively every cell be carried out after saturation charging terminates
Boost charge.For guaranteeing the safety of set of cells charging, real-time self-inspection in charging process, once have cause asking for charging security
Topic occurs, and immediately enters charge protection.
(1) charge protection：Monomer battery voltage, assembled battery total voltage, temperature and electric current number according to the collection of acquisition module 2
According to, be charged defencive function judgement.Charging protection function includes set of cells overtemperature protection, supercool protection, overvoltage protection, charging
Error protection.Set of cells overtemperature protection be when overheated limit value is above in acquisition module 2 collects the continuous 5s of battery pack temperature,
Set of cells overtemperature protection；Set of cells supercool protection be when acquisition module 2 collect be below in the continuous 5s of battery pack temperature supercool
During limit value, the supercool protection of set of cells；Set of cells overvoltage protection is that to collect the continuous 2s of assembled battery total voltage high when acquisition module 2
In limit value, or any one monomer battery voltage continuous 2s is when being above limit value, set of cells overvoltage protection；Set of cells charging event
Barrier is that if set of cells sends charge request, continuous 10s acquisition modules 2 are not detected by after set of cells communicates success with charger
Charging current, or set of cells do not send charge request, continuous 10s acquisition modules 2 detect charging current more than 2A, then recognize
For there is charge fault.Once battery management system charge protection, then disconnect N1 and N2, charge circuit is cut off, while passing through CAN
Charger and balanced power module output are forbidden in communication.
(2) it is pre-charged：If set of cells is without the security fault for causing charging, i.e., when not being charged protection, according to collection
The data of the assembled battery total voltage and monomer battery voltage of the collection of module 2, if assembled battery total voltage is total less than precharge cell group
Voltage limits Vtpre or any one monomer battery voltage are less than precharge monomer battery voltage limit value Vspre, then cell tube
Reason system closure N1 connects charge circuit with N2, and adjusting charger by CAN communication makes which with 0.05C constant current outputs, if now
Cell meets the balanced condition that opens, then enter Balance route algorithm, while controlling balanced power module by CAN communication
N5 is connected, N4 and N6 is closed, balanced power supply is externally exported with 5V/3A.
(3) quick charge：If set of cells is without the security fault for causing charging, i.e., when not being charged protection, according to adopting
The data of the assembled battery total voltage and monomer battery voltage of the collection collection of module 2, when assembled battery total voltage is more than Vspeed, battery
Management system adjusts charger by CAN communication and makes which with 0.5C constant current outputs.If now cell meets balanced unlatching
Condition, then enter Balance route algorithm, while controlling balanced power module by CAN communication connects N6, closes N4 and N5, balanced
Power supply is externally exported with 5V/5A.
(4) saturation charges：If set of cells is without the security fault for causing charging, i.e., when not being charged protection, according to adopting
The data of the assembled battery total voltage and monomer battery voltage of the collection collection of module 2, when assembled battery total voltage is more than Vsatura, electricity
Pond management system adjusts charger by CAN communication and makes which with 0.2C constant current outputs, until assembled battery total voltage reaches charging and cuts
Only voltage Vtstop or monomer battery voltage reach charge cutoff voltage Vsstop, disconnect N1 and N2, cut off charge circuit, pass through
CAN communication control charger forbids that charger is exported.If now cell meets the balanced condition that opens, balanced control is entered
Algorithm processed, while controlling balanced power module by CAN communication connects N4, closes N5 and N6, and balanced power supply is externally defeated with 5V/1A
Go out.
(5) boost charge：After saturation charging terminates, boost charge is carried out to every cell successively, that is, pass through CAN
Communication Control equilibrium power module connects relay N5, closes relay N4 and N6, controls balanced management module（8）Multichannel open
Close, open the balanced path of each cell successively, so far monomer battery voltage reaches threshold voltage Vsstop, treats all lists
Body cell voltage closes all switches of balanced management module 8, by CAN communication control successively after the completion of boost charge
Weighing apparatus power module closes relay N5, N4, N6.
Claims (10)
1. a kind of intelligent power lithium ion battery management system, it is characterised in that include：Micro controller module (1) and connect with which
The acquisition module (2) that connects, memory module (3), security protection module (4), communication module (5), charge and discharge control module (6),
Weighing apparatus management module (8)；Acquisition module (2), charge and discharge control module (6), balanced management module (8) are used for connecting battery unit；
Micro controller module (1)：Charge and discharge control module (6), safety are controlled according to the battery data information of acquisition module (2) to protect
Shield module (4) and balanced management module (8), and battery data information and status information are sent to by communication module (6)
Device controller, and store memory module (3)；
Charge and discharge control module (6)：For connecting battery unit, and the charge and discharge process to set of cells is managed, and it is right to realize
The automatic charging of lithium battery group；
Balanced management module (8)：For reducing the difference between cell capacity in set of cells charging process, and realize certainly
Dynamic error detection with automatically configure euqalizing current；
The outfan of charge and discharge control module (6) and the outfan of security protection module (4) respectively with defeated with the two of door
Enter end connection, be connected with the G poles of field effect transistor N1, field effect transistor N2 with gate output terminal, the D poles of field effect transistor N1, N2 and relay
Connect through the negative pole of current sensor, fuse and battery unit after one end connection of device N3 successively, the S of field effect transistor N1, N2
Extremely it is connected with charger negative pole after parallel connection, the positive pole of charger is connected with the positive pole of battery unit；The other end of relay N3 leads to
Overload is connected with the positive pole of battery unit, and control end is connected with micro controller module (1), and charger passes through CAN and leads to
News module (5) connection, also by each list for the balanced power module, balanced management module (8) and battery unit being sequentially connected
Body battery plus-negative plate connects.
2. a kind of intelligent power lithium ion battery management system according to claim 1, it is characterised in that the equalizer line
Reason module (8) includes that multiple diodes and switch arrays, switch arrays are used for controlling the equalizaing charge of each cell and open
Open and closing, including multiple switch；After each cell both positive and negative polarity difference series diode, switch, with balanced power module
Positive-negative output end connection.
3. a kind of charge control method of intelligent power lithium ion battery management system, it is characterised in that comprise the following steps：
According to the monomer battery voltage that acquisition module (2) is collected, assembled battery total voltage, temperature and total current, judge whether into
Row charge protection；If desired protection is charged, then disconnects field effect transistor N1 and field effect transistor N2, while prohibiting by CAN communication
Only charger and balanced power module output；
If protection need not be charged, pre-charging stage is entered, if cell meets equilibrium and opens in pre-charging stage
The condition for opening, then carry out equalizaing charge, at the same micro controller module (1) by CAN communication control balanced power module connect after
Electrical equipment N5, closes relay N4, relay N6, and balanced power module is exported with 5V/3A；If being unsatisfactory for, next step is executed；
The quick charge stage is entered, if cell meets the balanced condition that opens in the quick charge stage, equilibrium is carried out
Charge, while micro controller module (1) controls balanced power module by CAN communication connects N6, close N4 and N5, balanced power supply
Module is exported with 5V/5A；If being unsatisfactory for, next step is executed；
The saturation charging stage is entered, if cell meets the balanced condition that opens in the saturation charging stage, equilibrium is carried out
Charge, while micro controller module (1) controls balanced power module by CAN communication connects N4, close N5 and N6, balanced power supply
Exported with 5V/1A；If being unsatisfactory for, next step is executed；
The boost charge stage is entered, in the boost charge stage, is controlled by balanced management module (8) and switch and CAN communication
Weighing apparatus module is charged to every cell successively, until all cells reach charge cutoff voltage Vsstop, is tied
Beam charges, and closes all switches of balanced management module (8), and by CAN communication control balanced power module closing after
Electrical equipment N5, N4, N6.
4. the charge control method of a kind of intelligent power lithium ion battery management system according to claim 3, its feature
Charge protection is judged whether to described in being to be specially：Then think when there are following situations that needs are charged protection, otherwise
Protection need not be charged：
Acquisition module (2) is collected in the continuous 5s of battery pack temperature higher or lower than limit value；
The continuous 2s of assembled battery total voltage is higher than limit value, or the continuous 2s of any one monomer battery voltage is above limit value；
Set of cells is communicated after success with charger, if set of cells sends charge request, continuous 10s acquisition modules (2) are not detected by
Charging current, or set of cells do not send charge request, continuous 10s acquisition modules (2) detect charging current more than 2A.
5. the charge control method of a kind of intelligent power lithium ion battery management system according to claim 3, its feature
It is that the precharge is comprised the following steps：If assembled battery total voltage less than precharge cell group total voltage limit value Vtpre or
Any one monomer battery voltage controls field effect less than precharge monomer battery voltage limit value Vspre, micro controller module (1)
Pipe N1 and the conducting of field effect transistor N2, adjust charger with 0.05C constant current outputs by CAN communication.
6. the charge control method of a kind of intelligent power lithium ion battery management system according to claim 3, its feature
It is that the quick charge is comprised the following steps：When assembled battery total voltage is more than threshold value Vspeed, micro controller module (1) is controlled
Field effect transistor N1 processed and the conducting of field effect transistor N2, adjust charger with 0.5C constant current outputs by CAN communication.
7. the charge control method of a kind of intelligent power lithium ion battery management system according to claim 3, its feature
It is that the saturation charges to comprise the following steps：When assembled battery total voltage is more than threshold value Vsatura, micro controller module (1)
By CAN communication adjust charger with 0.2C constant current outputs, until assembled battery total voltage reach charge cutoff voltage Vtstop or
Monomer battery voltage reaches charge cutoff voltage Vsstop, disconnects field effect transistor N1 and field effect transistor N2, by CAN communication control
Charger forbids that charger is exported.
8. the charge control method of a kind of intelligent power lithium ion battery management system according to claim 3, its feature
It is that the boost charge is comprised the following steps：
Boost charge is carried out to every cell successively, i.e., balanced power module is controlled by CAN communication and is connected relay N5,
Relay N4 and N6 is closed, the variable connector of balanced management module (8) is controlled, the equilibrium for opening each cell successively is led to
Road, so far monomer battery voltage reach threshold voltage Vsstop.
9. the charge control method of a kind of intelligent power lithium ion battery management system according to claim 3, its feature
It is that the condition that the equilibrium is opened is：After judging battery unit fault-free, voltage highest cell and voltage are minimum
The voltage difference of cell opens limit value Udva more than balanced.
10. the charge control method of a kind of intelligent power lithium ion battery management system according to claim 3, its feature
It is that the equalizaing charge is specially：The battery unit minimum to voltage is charged, and the charging stage according to residing for battery,
The output current that balanced power module is adjusted by CAN communication, until the pressure reduction of all cells is respectively less than threshold value Udvb be
Only.
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