CN105024411A - Intelligent power lithium ion battery management system and charging control method - Google Patents
Intelligent power lithium ion battery management system and charging control method Download PDFInfo
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Abstract
The invention relates to an intelligent power lithium ion battery management system. The system comprises a microcontroller module, an acquisition module, a storage module, a safety protection module, a communication module, a charging and discharging control module and an equalization management module, wherein the acquisition module, the storage module, the safety protection module, the communication module, the charging and discharging control module and the equalization management module are connected to the microcontroller module. The charging method comprises the following steps that according to a single battery voltage collected by the acquisition module, a total voltage of a battery pack, a temperature, a current and other information, whether the battery allows to be charged is determined; if the battery allows to be charged, the battery management system automatically adjusts a charging mode to the battery pack; through CAN communication, an output current of an equalization power supply module is automatically adjusted; equalization charging is performed on a single battery with a low voltage till that differential voltages of all the single batteries are less than a threshold. By using the system and the method of the invention, according to data information of the battery pack, a charging mode can be automatically selected, a charging current is automatically matched, a charging protection function is possessed, charging efficiency of the battery pack can be increased and a circulation service life of the battery pack is prolonged.
Description
Technical field
The invention belongs to power battery management system field, is a kind of battery management system and charge control method thereof of power lithium-ion battery specifically.
Background technology
Along with the development of electric motor car, hybrid power instrument, various electrokinetic cell is used widely.The advantages such as lithium battery is little with its volume, and self-discharge rate is low, and energy density is high, and service life cycle is long, become the most promising electrokinetic cell.But lithium battery security and stability is not high, overcharge, overdischarge all can damage lithium ion battery, think and ensure the trouble free service of lithium ion battery, high performance battery management system must be equipped with.
Existing lithium battery management system, charging strategy is single, adopts constant current charge more, rationally can not charge according to the characteristic of battery, and often charge efficiency is high and easily damage lithium ion battery, shortens its useful life.Most of lithium battery management system adopts the balanced way of passive equilibrium simultaneously, and equalization efficiency is low, and easily causes thermal management issues.
Summary of the invention
The intelligent power lithium ion battery management system that the object of the invention is to provide a kind of stable performance, cost is low, power consumption is little, charge efficiency is high, portfolio effect is good, to overcome the defect of above-mentioned battery management system.
The technical scheme that the present invention is adopted for achieving the above object is: a kind of intelligent power lithium ion battery management system, comprising: micro controller module and connected acquisition module, memory module, security protection module, communication module, charge and discharge control module, balanced management module; Acquisition module, charge and discharge control module, balanced management module are for connecting battery unit;
Micro controller module: the battery data information according to acquisition module controls charge and discharge control module, security protection module and balanced management module, and battery data information and state information are sent to device controller by communication module, and be stored into memory module;
Charge and discharge control module: for connecting battery unit, and the charge and discharge process of battery pack is managed, realize the automatic charging to lithium battery group;
Balanced management module: for reducing the difference between cell capacity in batteries charging process, and realize automatic error detection and automatically configure euqalizing current.
The output of described charge and discharge control module and the output of security protection module are connected respectively with two inputs of door, be connected with the G pole of field effect transistor N1, field effect transistor N2 with gate output terminal, be connected with the negative pole of battery unit through current sensor, fuse successively after the D pole of field effect transistor N1, N2 is connected with one end of relay N3, the S of field effect transistor N1, N2 is extremely in parallel to be connected with charger negative pole afterwards, and the positive pole of charger is connected with the positive pole of battery unit; The other end of relay N3 is connected with the positive pole of battery unit by load, control end is connected with micro controller module, charger is connected with communication module by CAN, is also connected with each cell both positive and negative polarity of battery unit by the balanced power module that connects successively, balanced management module.
Described balanced management module comprises multiple diode and switch arrays, and switch arrays open and close for the equalizing charge controlling each cell, comprise 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 charge control method for intelligent power lithium ion battery management system, comprises the following steps:
According to the monomer battery voltage that acquisition module collects, assembled battery total voltage, temperature and total current, judge whether to carry out charge protection; If desired carry out charge protection, then disconnect field effect transistor N1 and field effect transistor N2, forbid that charger and balanced power module export by CAN communication simultaneously;
Charge protection is carried out if do not need, then enter pre-charging stage, if cell meets balanced condition of opening in pre-charging stage, then carry out equalizing charge, micro controller module controls balanced power module engage relay N5 by CAN communication simultaneously, closed relay N4, relay N6, balanced power module exports with 5V/3A; If do not meet, perform next step;
Enter the quick charge stage, if cell meets balanced condition of opening in the quick charge stage, then carry out equalizing charge, micro controller module controls balanced power module by CAN communication and connects N6 simultaneously, close N4 and N5, balanced power module exports with 5V/5A; If do not meet, perform next step;
Enter the saturated charging stage, if cell meets balanced condition of opening in the saturated charging stage, then carry out equalizing charge, micro controller module controls balanced power module by CAN communication and connects N4 simultaneously, and close N5 and N6, balanced power supply exports with 5V/1A; If do not meet, perform next step;
Enter the boost charge stage, in the boost charge stage, control balance module by balanced management module and switch and CAN communication to charge to often propping up cell successively, until all cells all reach charge cutoff voltage Vsstop, complete charge, and close all switches of balanced management module, and control balanced power module closed relay N5, N4, N6 by CAN communication.
Describedly judge whether that carrying out charge protection is specially: then thinking when there is following situation needs to carry out charge protection, otherwise does not need to carry out charge protection:
Acquisition module collects 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 any continuous 2s of monomer battery voltage is all higher than limit value;
Battery pack and charger communication success after, if battery pack send charge request, continuous 10s acquisition module does not detect charging current, or battery pack does not send charge request, and continuous 10s acquisition module detects that charging current is greater than 2A.
Described precharge comprises the following steps:
If assembled battery total voltage lower than precharge cell group total voltage limit value Vtpre or any monomer battery voltage lower than precharge monomer battery voltage limit value Vspre, micro controller module controls field effect transistor N1 and field effect transistor N2 conducting, regulates charger with 0.05C constant current output by CAN communication.
Described quick charge comprises the following steps:
When assembled battery total voltage is greater than threshold value Vspeed, micro controller module controls field effect transistor N1 and field effect transistor N2 conducting, regulates charger with 0.5C constant current output by CAN communication.
Described saturated charging comprises the following steps:
When assembled battery total voltage is greater than threshold value Vsatura, micro controller module regulates charger with 0.2C constant current output by CAN communication, until assembled battery total voltage reaches charge cutoff voltage Vtstop or monomer battery voltage reaches charge cutoff voltage Vsstop, disconnect field effect transistor N1 and field effect transistor N2, control charger by CAN communication and forbid that charger exports.
Described boost charge comprises the following steps:
Boost charge is carried out successively to often propping up cell, namely balanced power module engage relay N5 is controlled by CAN communication, closed relay N4 and N6, control the variable connector of balanced management module (8), open the balanced path of each cell successively, so far monomer battery voltage reaches threshold voltage Vsstop.
The condition that described equilibrium is opened is: after judging battery unit fault-free, and the voltage difference of the cell that voltage is the highest and the minimum cell of voltage is greater than balanced unlatching limit value Udva.Be specially: the monomer battery voltage collected according to acquisition module, judge battery unit whether fault; As fault-free, then balancedly open limit value Udva when the voltage difference of the highest cell of voltage and the minimum cell of voltage is greater than, then enter equalizing charge; If any fault, then do not enter equalizing charge, micro controller module controls balanced power module closed relay N4, N5 and N6 by CAN communication simultaneously.
Described equalizing charge is specially: the battery unit minimum to voltage charges, and the charging stage residing for battery, regulated the output current of balanced power module by CAN communication, until the pressure reduction of all cells is all less than threshold value Udvb.
The present invention has following beneficial effect and advantage:
1. the present invention is centralized battery management system, the features such as have volume little, stable performance, acquisition precision is high, and cost is low, and reliability is strong.
2. Li-ion Battery Management System of the present invention; use CAN communication network and carry out charging in conjunction with battery behavior and control; automatically charging modes can be selected according to battery pack data message; Auto-matching charging current; and there is charging protection function; the charge efficiency of battery pack can be improved, extend battery cyclic useful life.
3. the invention provides a kind of equalizing charge control mode, by CAN communication network and balanced power module communication, automatically start according to battery pack data message and close equalizing charge, automatically euqalizing current can be configured in the charging stage that battery pack is different, and after main charging terminates, carrying out boost charge to often propping up cell successively, improve Capacity uniformity between cell.
4. the invention provides a kind of balanced power module, can CAN communication regulation output electric current be passed through, for battery pack balancing charging provides regulated power supply.
Accompanying drawing explanation
Fig. 1 is 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.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
The invention provides a kind of intelligent power lithium ion battery management system, it comprises micro controller module 1, power module 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.This battery management system can to lithium battery voltage, temperature, electric current and battery charge state (being called for short SOC) Real-Time Monitoring and management, CAN communication network is used to carry out charging controller to battery pack, namely automatically charge mode is regulated according to battery pack data message, the cell poor to Capacity uniformity carries out balanced management, automatic configuration equalizing charge electric current, improves the Capacity uniformity of lithium battery.This battery management system can improve the charge efficiency of battery, increases the service life, and guarantees battery pack safety, stable operation.
As shown in Figure 1, power module 7 of the present invention is connected with acquisition module 2, micro controller module 1, communication module 5, memory module 3, security protection module 4 respectively, provides 5 module work voltages, ensures that battery management system normally works.
Described acquisition module 2 is for the detection of monomer battery voltage, assembled battery total voltage, total current and temperature; Be made up of temperature, total voltage, monomer battery voltage, total current and euqalizing current Acquisition Circuit.Acquisition Circuit is made up of differential operational amplifier and divider resistance, and temperature sensor adopts thermistor, and the current sensor needed for total current gathers adopts precision resistance, and the current sensor needed for euqalizing current gathers adopts Hall current sensor.
Described micro controller module 1 is the nucleus module of whole system, and it receives the data message gathered, row relax of going forward side by side; Corresponding logical operation is carried out according to the data message obtained; estimation SOC; control security protection module 4, balanced management module 8, charge and discharge control module 6; by data message, system status information and the fault message write memory module 3 gathered, and undertaken alternately by communication module 5 and external equipment (as entire car controller).
Described charge and discharge control module 6, for managing the charge and discharge process of battery pack, realizes the intelligent automatic charging to lithium battery group.Be made up of charging control circuit and charge/discharge control circuit, charge and discharge process is controlled by microprocessor module, control to adopt precharge, quick charge, saturated charging and boost charge control by stages to the charging of battery pack, and manage with equalizing charge and combine, battery management system can configure charging modes automatically according to battery pack data message, and by CAN communication network and charger and balanced power module communication, configuration charging current and euqalizing current automatically.
Described security protection module 4 for the fault detect to battery management system and battery pack, to prevent the generation of security incident.The signal exported when receiving microprocessor judges generation potential safety hazard, by the enable protecting control signal of grade, produces corresponding protection act.
Described communication module 5, receives the information that micro controller module is sent, and sends to external communications equipment, receives the command information that external communications equipment is sent simultaneously, is forwarded to micro controller module process.
Described memory module 3 belongs to non-volatile memory module, be connected with microprocessor module 1, non-volatile storage read-write can be carried out, storage speed is fast, can store the data message of lithium battery management system and state information, and store information when management system power down and can not lose, can the data message of permanent storage lithium ion battery management system.
Described balanced management module 8 for reducing the diversity factor between cell capacity in batteries charging process, and has automatic error detection and automatically configures euqalizing current function.Be made up of multiple identical switch arrays, there is very strong portability.Balanced management module switch array one end connects with balanced power module, and the other end is connected with cell, and each switch arrays control by micro controller module.When certain battery unit reaches balanced opening, corresponding switch arrays are opened, and charge to this cell.
Described balanced power module, be made up of CAN communication module, MCU module, 3 power transfer module, multiple switch and diodes, communication can be carried out with battery management system, according to the instruction of battery management system, carry out corresponding action, for balanced management module provides required input power.
As shown in Figure 2, charge and discharge control module 6 of the present invention is connected with charger and balanced power module 8 by CAN communication; The startup charging signals of charge and discharge control module 6 and the charge protection signal of charging protecting module in security protection module 4 are by being connected with the G pole of field effect transistor N1 and N2 with door, the control end of relay N3 is connected with battery management system micro controller module 1, and the D pole of N1, N2 is connected with the negative pole of battery unit through current sensor, fuse successively with after one end parallel connection of N3; The S of field effect transistor N1, N2 is extremely in parallel to be connected with charger negative pole end afterwards, the other end of field effect transistor N3 is connected with load, the anode of battery pack is connected with charger and load as charging port, if after battery pack starts charging, micro controller module 1 controls charge control module 6 and exports, N1 and N2 is connected, relay N3 disconnects, if after battery pack star t-up discharge, micro controller module 1 controls charge and discharge control module 6 and exports, N1 and N2 is disconnected, and relay N3 connects.
Security protection module 4 proposed by the invention mainly realizes a series of defencive functions such as battery system overcharge, overdischarge, overtemperature, low temperature, overcurrent, balanced fault, fuse failure, guarantees that battery pack safely and steadily runs.Carry out classification process according to the fault that battery management system detects to the significance level of system cloud gray model and safe coefficient, the defencive function of safety protection module is divided into three-level protective, and first order protection is slight extent, alarm; Second level protection is the order of severity, and alarm also disconnects related work circuit, stops corresponding relevant action; Third level protection is fuse protection, cuts off total out-put supply.All control signals send after carrying out Logic judgment by microcontroller according to the data message after process.
Communication module 5 proposed by the invention, adopts CAN communication network and charger, balanced power module and peripheral device communication, realizes charging control, Balance route and outbound data mutual.
As shown in Figure 4, balanced management module (8) proposed by the invention is made up of variable connector selection circuit, be connected with switch S 1 and S2 after first cell both positive and negative polarity seals in diode D7 with D8 respectively, the other end of S1 with S2 is connected with the both positive and negative polarity of balanced power supply respectively, and in like manner the equalizing circuit of other cells is also as said method connects.If start the equalizing charge to a certain cell, then two switches of this balanced branch road closed, cut out the switch of other all branch roads simultaneously.
Balanced power module proposed by the invention as shown in Figure 3, comprise 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 composition; CAN communication module (U2) is connected with the communication module 5 of battery management system, receives control command return execution result for balanced power module; MCU module (U1) is connected by serial port communication line with CAN communication module (U2); Switch N4 control end and MCU module (U1) are electrically connected, another two ends are connected with the positive pole of D1 positive pole and P1 respectively, switch N5 control end and MCU module (U1) are electrically connected, another two ends are connected with the positive pole of D3 positive pole and P2 respectively, switch N6 control end and MCU module (U1) are electrically connected, another two ends are connected with the positive pole of D5 positive pole and P3 respectively, the negative pole end positive terminal as balanced power module in parallel of diode D1, D3 and D5.The negative pole end of D2 is connected with P1 negative pole end, and the negative pole end of D4 is connected with P2 negative pole end, and the negative pole end of D6 is connected with P3 negative pole end, the positive terminal negative pole end as balanced power module in parallel of D2, D4 and D6.MCU module (U1) is by CAN communication module (U2), receive the instruction of sending from battery management system, again according to instruction, by control switch N1, N2 and N3, one of them power module of P1, P2 and P3 is selected to connect, or Close All, require to export corresponding current/voltage according to communications protocol, and after connection exports, return balanced power supply normally output order by CAN communication to battery management system.
Balance route algorithm proposed by the invention; whether battery management system detects balanced power module by mechanical contact and connects; if balanced power module connects; then in order to ensure the safety of equalizing charge; battery management system carries out self-inspection in real time; even balanced unlatching; euqalizing current is not detected in the continuous 5s of battery management system; or equilibrium is not opened; euqalizing current is detected in the continuous 5s of battery management system; then equalizing charge protection, is closed the multidiameter option switch of all balanced management modules 8, is forbidden the output of balanced power module 8 by CAN communication.If balanced self-inspection equalizing charge fault-free, then enter equalizing charge control algolithm, according to the monomer battery voltage that acquisition module 2 collects, find the highest cell of voltage and the minimum cell of voltage, if the voltage difference of two cells is greater than balanced unlatching limit value Udva, then start the equalizing charge to the lower cell of voltage, namely by connecting the switch on the balanced branch road of this cell, equalizing charge is carried out to it, and the output current of balanced power module is regulated by CAN communication, until the pressure reduction of all cells is all less than balanced outage threshold Udvb, close 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 comprises precharge, quick charge, saturated charging and boost charge.In precharge, quick charge, saturated charging stage, Li-ion Battery Management System carries out balanced management according to monomer battery voltage information simultaneously.Precharge mode is adopted when battery voltage is lower, fast charge mode is transferred to after 10min, when batteries charging is to latter stage, namely when battery voltage reaches certain value, proceed to saturated charging, equalizing charge all can start under above three charge modes, after saturated charging terminates, carry out boost charge respectively to often propping up cell.For guaranteeing the safety of batteries charging, real-time self-inspection in charging process, once there be the problem causing charging security to occur, enters charge protection immediately.
(1) charge protection: the monomer battery voltage, assembled battery total voltage, temperature and the current data that gather according to acquisition module 2, carries out charging protection function judgement.Charging protection function comprises battery pack overtemperature protection, cold protection excessively, overvoltage protection, charge fault protection.Battery pack overtemperature protection is when acquisition module 2 to collect in the continuous 5s of battery pack temperature all higher than overheated limit value, battery pack overtemperature protection; It is that battery pack crosses cold protection when acquisition module 2 collects all lower than when crossing cold limit value in the continuous 5s of battery pack temperature that battery pack crosses cold protection; Battery pack overvoltage protection collects the continuous 2s of assembled battery total voltage all higher than limit value when acquisition module 2, or any continuous 2s of monomer battery voltage all higher than limit value time, battery pack overvoltage protection; Batteries charging fault is when after battery pack and charger communication success, if battery pack sends charge request, continuous 10s acquisition module 2 does not detect charging current, or battery pack does not send charge request, continuous 10s acquisition module 2 detects that charging current is greater than 2A,, then think and occur charge fault.Once battery management system charge protection, then disconnect N1 and N2, cut off charge circuit, forbid that charger and balanced power module export by CAN communication simultaneously.
(2) precharge: if battery pack is without the security fault causing charging, when namely not carrying out charge protection, the assembled battery total voltage gathered according to acquisition module 2 and the data of monomer battery voltage, if assembled battery total voltage lower than precharge cell group total voltage limit value Vtpre or any monomer battery voltage lower than precharge monomer battery voltage limit value Vspre, then battery management system closes N1 and N2 and connects charge circuit, charger is regulated to make it with 0.05C constant current output by CAN communication, if now cell meets balanced condition of opening, then enter Balance route algorithm, control balanced power module by CAN communication simultaneously and connect N5, close N4 and N6, balanced power supply externally exports with 5V/3A.
(3) quick charge: if battery pack is without the security fault causing charging; when namely not carrying out charge protection; the assembled battery total voltage gathered according to acquisition module 2 and the data of monomer battery voltage; when assembled battery total voltage is greater than Vspeed, battery management system regulates charger to make it with 0.5C constant current output by CAN communication.If now cell meets balanced condition of opening, then enter Balance route algorithm, control balanced power module by CAN communication simultaneously and connect N6, close N4 and N5, balanced power supply externally exports with 5V/5A.
(4) saturated charging: if battery pack is without the security fault causing charging; when namely not carrying out charge protection; the assembled battery total voltage gathered according to acquisition module 2 and the data of monomer battery voltage; when assembled battery total voltage is greater than Vsatura; battery management system regulates charger to make it with 0.2C constant current output by CAN communication; until assembled battery total voltage reaches charge cutoff voltage Vtstop or monomer battery voltage reaches charge cutoff voltage Vsstop; disconnect N1 and N2; cut off charge circuit, control charger by CAN communication and forbid that charger exports.If now cell meets balanced condition of opening, then enter Balance route algorithm, control balanced power module by CAN communication simultaneously and connect N4, close N5 and N6, balanced power supply externally exports with 5V/1A.
(5) boost charge: after saturated charging terminates, boost charge is carried out successively to often propping up cell, namely balanced power module engage relay N5 is controlled by CAN communication, closed relay N4 and N6, control the variable connector of balanced management module (8), open the balanced path of each cell successively, so far monomer battery voltage reaches threshold voltage Vsstop, after until all monomer battery voltages, boost charge completes all successively, close all switches of balanced management module 8, control balanced power module closed relay N5, N4, N6 by CAN communication.
Claims (11)
1. an intelligent power lithium ion battery management system, is characterized in that comprising: micro controller module (1) and connected acquisition module (2), memory module (3), security protection module (4), communication module (5), charge and discharge control module (6), balanced management module (8); Acquisition module (2), charge and discharge control module (6), balanced management module (8) are for connecting battery unit;
Micro controller module (1): the battery data information according to acquisition module (2) controls charge and discharge control module (6), security protection module (4) and balanced management module (8), and battery data information and state information are sent to device controller by communication module (6), and be stored into memory module (3);
Charge and discharge control module (6): for connecting battery unit, and the charge and discharge process of battery pack is managed, realize the automatic charging to lithium battery group;
Balanced management module (8): for reducing the difference between cell capacity in batteries charging process, and realize automatic error detection and automatically configure euqalizing current.
2. a kind of intelligent power lithium ion battery management system according to claim 1, it is characterized in that the output of described charge and discharge control module (6) is connected respectively with two inputs of door with the output of security protection module (4), with gate output terminal and field effect transistor N1, the G pole of field effect transistor N2 connects, field effect transistor N1, successively through current sensor after the D pole of N2 is connected with one end of relay N3, fuse is connected with the negative pole of battery unit, field effect transistor N1, the S of N2 is extremely in parallel to be connected with charger negative pole afterwards, the positive pole of charger is connected with the positive pole of battery unit, the other end of relay N3 is connected with the positive pole of battery unit by load, control end is connected with micro controller module (1), charger is connected with communication module (5) by CAN, is also connected with each cell both positive and negative polarity of battery unit by the balanced power module that connects successively, balanced management module (8).
3. a kind of intelligent power lithium ion battery management system according to claim 1, it is characterized in that described balanced management module (8) comprises multiple diode and switch arrays, switch arrays open and close for the equalizing charge controlling each cell, comprise 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.
4. a charge control method for intelligent power lithium ion battery management system, is characterized in that comprising the following steps:
According to the monomer battery voltage that acquisition module (2) collects, assembled battery total voltage, temperature and total current, judge whether to carry out charge protection; If desired carry out charge protection, then disconnect field effect transistor N1 and field effect transistor N2, forbid that charger and balanced power module export by CAN communication simultaneously;
Charge protection is carried out if do not need, then enter pre-charging stage, if cell meets balanced condition of opening in pre-charging stage, then carry out equalizing charge, micro controller module (1) controls balanced power module engage relay N5 by CAN communication simultaneously, closed relay N4, relay N6, balanced power module exports with 5V/3A; If do not meet, perform next step;
Enter the quick charge stage, if cell meets balanced condition of opening in the quick charge stage, then carry out equalizing charge, micro controller module (1) controls balanced power module by CAN communication and connects N6 simultaneously, close N4 and N5, balanced power module exports with 5V/5A; If do not meet, perform next step;
Enter the saturated charging stage, if cell meets balanced condition of opening in the saturated charging stage, then carry out equalizing charge, micro controller module (1) controls balanced power module by CAN communication and connects N4 simultaneously, close N5 and N6, balanced power supply exports with 5V/1A; If do not meet, perform next step;
Enter the boost charge stage, in the boost charge stage, control balance module by balanced management module (8) and switch and CAN communication to charge to often propping up cell successively, until all cells all reach charge cutoff voltage Vsstop, complete charge, and close all switches of balanced management module (8), and control balanced power module closed relay N5, N4, N6 by CAN communication.
5. a kind of intelligent power lithium ion battery management system according to claim 4, judges whether described in it is characterized in that carrying out charge protection is specially: then thinking when there is following situation needs to carry out charge protection, otherwise does not need to carry out charge protection:
Acquisition module (2) collects 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 any continuous 2s of monomer battery voltage is all higher than limit value;
Battery pack and charger communication success after, if battery pack sends charge request, continuous 10s acquisition module (2) does not detect charging current, or battery pack does not send charge request, and continuous 10s acquisition module (2) detects that charging current is greater than 2A.
6. the charge control method of a kind of intelligent power lithium ion battery management system according to claim 4, it is characterized in that described precharge comprises the following steps: if assembled battery total voltage lower than precharge cell group total voltage limit value Vtpre or any monomer battery voltage lower than precharge monomer battery voltage limit value Vspre, micro controller module (1) controls field effect transistor N1 and field effect transistor N2 conducting, regulates charger with 0.05C constant current output by CAN communication.
7. the charge control method of a kind of intelligent power lithium ion battery management system according to claim 4, it is characterized in that described quick charge comprises the following steps: when assembled battery total voltage is greater than threshold value Vspeed, micro controller module (1) controls field effect transistor N1 and field effect transistor N2 conducting, regulates charger with 0.5C constant current output by CAN communication.
8. the charge control method of a kind of intelligent power lithium ion battery management system according to claim 4, it is characterized in that described saturated charging comprises the following steps: when assembled battery total voltage is greater than threshold value Vsatura, micro controller module (1) regulates charger with 0.2C constant current output by CAN communication, until assembled battery total voltage reaches charge cutoff voltage Vtstop or monomer battery voltage reaches charge cutoff voltage Vsstop, disconnect field effect transistor N1 and field effect transistor N2, control charger by CAN communication and forbid that charger exports.
9. the charge control method of a kind of intelligent power lithium ion battery management system according to claim 4, is characterized in that described boost charge comprises the following steps:
Boost charge is carried out successively to often propping up cell, namely balanced power module engage relay N5 is controlled by CAN communication, closed relay N4 and N6, control the variable connector of balanced management module (8), open the balanced path of each cell successively, so far monomer battery voltage reaches threshold voltage Vsstop.
10. the charge control method of a kind of intelligent power lithium ion battery management system according to claim 4, it is characterized in that the condition that described equilibrium is opened is: after judging battery unit fault-free, the voltage difference of the cell that voltage is the highest and the minimum cell of voltage is greater than balanced unlatching limit value Udva.
The charge control method of 11. a kind of intelligent power lithium ion battery management systems according to claim 4, it is characterized in that described equalizing charge is specially: the battery unit minimum to voltage charges, and the charging stage residing for battery, the output current of balanced power module is regulated, until the pressure reduction of all cells is all less than threshold value Udvb by CAN communication.
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| CN201410154244.5A Expired - Fee Related CN105024411B (en) | 2014-04-17 | 2014-04-17 | A kind of intelligent power lithium ion battery management system and its charge control method |
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