CN108819752A - Battery management system - Google Patents
Battery management system Download PDFInfo
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- CN108819752A CN108819752A CN201810650465.XA CN201810650465A CN108819752A CN 108819752 A CN108819752 A CN 108819752A CN 201810650465 A CN201810650465 A CN 201810650465A CN 108819752 A CN108819752 A CN 108819752A
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- mcu processing
- processing module
- switch module
- analog front
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/20—Electric propulsion with power supplied within the vehicle using propulsion power generated by humans or animals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/51—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells characterised by AC-motors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
- B60L58/13—Maintaining the SoC within a determined range
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2200/00—Type of vehicles
- B60L2200/12—Bikes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The present invention discloses a kind of battery management system, including：Power management module, MCU processing module, analog front-end module, discharge switch module and charge switch module, power management module is for incuding activation signal with output driving power supply to MCU processing module, MCU processing module output wake-up signal starts the control instruction control discharge switch module that analog front-end module, MCU processing module control discharge switch module and/or charge switch module closure or analog front-end module are sent according to MCU processing module to analog front-end module and/or charge switch module is closed；When activation signal disappears, the control instruction control discharge switch module and/or charge switch module that MCU processing module control discharge switch module and/or charge switch module disconnect or analog front-end module is sent according to MCU processing module disconnect, MCU processing module controls analog front-end module and closes, and MCU processing module output cut-off enable signal controls power management module closing to power management module.
Description
Technical field
The present invention relates to technical field of power battery management more particularly to a kind of battery management systems.
Background technique
With the development of the lightweight electric powered vehicles such as electric bicycle, battery-operated motor cycle and electro-tricycle (LEV), lithium electricity
Pond has also obtained large-scale application in lightweight electric powered vehicles, and at this stage, the lithium battery of light vehicle generallys use battery protection
Plate is managed, cannot since battery protecting plate lacks the MCU for accurately calculating SOC numerical value and remaining capacity (KWh)
Flexible setting Protection parameters and the accurate SOC of progress and remaining capacity are calculated；Moreover, it, which only passes through indicator light, shows roughly SOC
State, there are voltage acquisition errors greatly, SOC calculating error is big, cannot accurately carry out the problems such as battery capacity indication, leads to lithium battery
Service life is had a greatly reduced quality；In addition, the reliability of battery management and safety are lower, nothing since battery protecting plate control is simple
Method is suitable for concentrating the emerging operation modes such as charging lease charge；Further, since the battery managements such as existing battery protecting plate system
For system in standby mode, each functional module is generally in energized state, and the stand-by power consumption of battery management system is big, cannot achieve
It is standby for a long time.
Summary of the invention
The purpose of the present invention is to provide a kind of battery management systems that stand-by power consumption is low.
To achieve the goals above, the present invention provides a kind of battery management system, for monitor battery pack state and
Battery pack is controlled, including：It is connected to the power management module at the both ends of the battery pack, connect with the power management module
MCU processing module, the analog front-end module being connect with the MCU processing module, discharge switch module and charge switch module,
The discharge switch module and charge switch module connect at least one of the MCU processing module and analog front-end module respectively
It connects；The power management module is for incuding activation signal with output driving power supply to the MCU processing module, at the MCU
Reason module output wake-up signal starts the analog front-end module, the MCU processing module control to the analog front-end module
It makes the discharge switch module and/or charge switch module closure or the analog front-end module and mould is handled according to the MCU
The control instruction that block is sent controls the discharge switch module and/or charge switch module closure；When the activation signal disappears
When, the MCU processing module controls the discharge switch module and/or charge switch module disconnects or the AFE(analog front end) mould
Root tuber controls the discharge switch module according to the control instruction that the MCU processing module is sent and/or charge switch module disconnects,
The MCU processing module controls the analog front-end module and closes, and the MCU processing module output cut-off enable signal is to described
Power management module is closed with controlling the power management module.
Preferably, the discharge switch module and charge switch module are connect with the analog front-end module.
Preferably, the charge switch module is connect with the MCU processing module, the MCU processing module produces strong
The pressure cut-off signal is simultaneously sent to the charge switch module by cut-off signal processed, disconnected to control the charge switch module
It opens.
Preferably, the analog front-end module is also connected with current divider, the analog front-end module acquires the battery pack
Information of voltage and the current information of the battery pack is acquired by the current divider.
Preferably, the battery management system further includes digital display module, at the digital display module and the MCU
Reason module is connected with power management module, the power management module output driving power to the digital display module,
The MCU processing module calculates the SOC and remaining capacity of the battery pack, the number according to the information of voltage and current information
Word display module shows the SOC and remaining capacity of the battery pack.
Preferably, the battery management system further includes external communication module, at the external communication module and the MCU
Reason module is connected with power management module, the power management module output driving power to the external communication module,
The SOC of the battery pack and remaining capacity are sent to peripheral control unit by the external communication module.
Preferably, the battery management system further includes temperature collecting module, the temperature collecting module and the battery
Group, MCU processing module and power management module connection, the power management module export the driving power to the temperature and adopt
Collect module, the temperature collecting module acquires the temperature information of the battery pack and the temperature information is sent to the MCU
Processing module.
Preferably, the power management module includes active circuit, switching circuit and DC-DC conversion circuit, the switch
The input terminal of circuit is connected to the battery pack, and the output end of the switching circuit is connected to the defeated of the DC-DC conversion circuit
Enter end, the output end of the DC-DC conversion circuit is connected to the MCU processing module, and the active circuit incudes the activation
Signal simultaneously exports high level to the switching circuit, and the switching circuit is connected under the driving of the high level so that power supply passes through
The driving power is converted to by the DC-DC conversion circuit.
Preferably, the active circuit includes activation branch and enabled branch parallel with one another, the MCU processing module connects
It is connected to the input terminal of the enabled branch, after the MCU processing module is activated, output conducting enable signal to the enabled branch
Road is so that the active circuit persistently exports high level to the switching circuit, when the discharge switch module and charge switch mould
When block is in off-state, the MCU processing module output cut-off enable signal to the enabled branch.
Preferably, the power management module further includes Acquisition Circuit, one end of the Acquisition Circuit is connected to described sharp
Branch living, the other end of the Acquisition Circuit are connected to the MCU processing module, and the MCU processing module is by the acquisition
Circuit acquires the node voltage of the active circuit, and compared with threshold voltage, when the node voltage is more than or equal to described
When threshold voltage, the discharge switch module and/or charge switch module are kept closed；When the node voltage is less than institute
When stating threshold voltage, the discharge switch module and/or charge switch module are disconnected by control.
Preferably, the activation signal includes load/charger access signal and/or external activation signal.
Compared with prior art, MCU processing module of the invention is connect with analog front-end module and power management module, will
For load/charger from when battery management system removal or external activation blackout, MCU processing module controls analog front-end module
Disconnect discharge switch module and charge switch module, then, MCU processing module control analog front-end module is closed and exported and cuts
Only enable signal closes power management module to power management module, MCU processing module also automatically into closed state, from
And battery management system is equivalent into off-mode, the power consumption of entire battery management system is very low.Moreover, of the invention
The information of voltage and current information for the battery pack that the MCU processing module of setting can be uploaded according to analog front-end module, it is accurate to count
The SOC and remaining capacity of battery are calculated, and shows the SOC and remaining capacity of battery by digital display module, battery management system
Reliability and safety are higher, can be suitable for concentrating the emerging operation modes such as charging lease charge.
Detailed description of the invention
Fig. 1 is the structural block diagram of battery management system of the embodiment of the present invention.
Fig. 2 is the circuit diagram of power management module of the embodiment of the present invention.
Specific embodiment
For the technology contents that the present invention will be described in detail, construction feature, below in conjunction with embodiment and cooperate attached drawing make into
One step explanation.
Fig. 1 and Fig. 2 is please referred to, the present invention provides a kind of battery management system 100, battery management system 100 is for supervising
The state and control battery pack 1 of battery pack 1 are surveyed, including：It is connected to the power management module M4 and power supply at the both ends of battery pack 1
The MCU processing module M3 of management module M4 connection, analog front-end module M1, the discharge switch mould being connect with MCU processing module M3
Block M5 and charge switch module M6, discharge switch module M5 and charge switch module M6 respectively with MCU processing module M3 and mould
At least one connection of quasi- front-end module M1；Power management module M4 is used to incude activation signal with output driving power supply VCC extremely
MCU processing module M3, so that MCU processing module M3, MCU processing module M3 be activated to export wake-up signal to analog front-end module M1
To start analog front-end module M1, MCU processing module M3 control discharge switch module M5 and/or charge switch module M6 closure or
The control instruction control discharge switch module M5 and/or charging that person's analog front-end module M1 is sent according to MCU processing module M3 are opened
Close module M6 closure；When activation signal disappears, MCU processing module M3 controls discharge switch module M5 and/or charge switch mould
The control instruction control discharge switch module M5 that block M6 is disconnected or analog front-end module M1 is sent according to MCU processing module M3
And/or charge switch module M6 is disconnected, MCU processing module M3 controls analog front-end module M1 and closes, MCU processing module M3 output
Cut-off enable signal controls power management module M4 closing to power management module M4, and power management module M4 stops output and drives
Dynamic power supply VCC, so that MCU processing module M3 is closed.
In the present embodiment, discharge switch module M5 and charge switch module M6 are connect with analog front-end module M1, mould
Quasi- front-end module M1 be closed according to the control instruction control discharge switch module M5 and/or charge switch module M6 received or
Discharge switch module M5 and/or charge switch module M6 is controlled to disconnect.Specifically, MCU processing module M3 real-time calculation and analysis mould
The information such as voltage, the electric current that quasi- front-end module M1 is sent, before battery pack 1 is discharged or is charged to battery pack 1, if cell tube
100 self-test of reason system is normal and the information such as voltage, electric current of battery pack 1 are normal, and MCU processing module M3 controls AFE(analog front end) mould
Block M1 is closed discharge switch module M5 and/or charge switch module M6, realizes charge or discharge；Battery pack 1 charging or
In discharge process, if the Information abnormities such as the voltage of battery pack 1, electric current, MCU processing module M3 sends control instruction to before simulating
End module M1 disconnects discharge switch module M5 and/or charge switch module M6, stops charge or discharge.
It is worth noting that, in the present embodiment, discharge switch module M5 and charge switch module M6 be with before simulation
What end module M1 was electrically connected, and discharge switch module M5 and charge switch module M6 is connected in series, analog front-end module M1 root
The control instruction control discharge switch module M5 and charge switch module M6 sent according to MCU processing module M3 is closed at or simultaneously
It disconnects, but is not limited to the mode of the present embodiment；It in some embodiments, can be by discharge switch module M5 and charge switch
Module M6 is directly connect with MCU processing module M3, directly controls discharge switch module M5 and charge switch by MCU processing module M3
Module M6, it might even be possible to be arranged to discharge switch module M5 and be connect with analog front-end module M1, at charge switch module M6 and MCU
Module M3 connection is managed, charge switch module is controlled by analog front-end module M1 control discharge switch module M5, MCU processing module M3
M6, etc..
Specifically, charge switch module M6 is also connect with MCU processing module M3, MCU processing module M3, which is produced, to be forced to break
ON signal simultaneously will force cut-off signal to be sent to charge switch module M6, to control charge switch module M6 disconnection；Thereby, it is filling
In electric process, it is high level signal that no matter analog front-end module M1, which is exported to discharge switch module M5 and charge switch module M6,
(closure signal) or low level signal (cut-off signal), it is disconnected that MCU processing module M3 can directly control charge switch module M6
It opens, realizes charging redundancy protecting, improve charging security, while improving the reliability and peace of entire battery management system 100
Quan Xing.
Referring to Fig. 1, current divider RS1 and battery pack 1 are gone here and there specifically, analog front-end module M1 is also connected with current divider RS1
Connection, analog front-end module M1 acquire the information of voltage of battery pack 1 and acquire the current information of battery pack 1, mould by current divider RS1
Information of voltage, current information are sent to MCU processing module M3 by quasi- front-end module M1；In the present embodiment, battery pack 1 includes 15
A concatenated battery, analog front-end module M1 acquires the monomer voltage and total voltage of 15 batteries, it is of course also possible to according to specific
It needs, the number of battery cells of battery pack 1 is arranged to other numbers.In the present embodiment, current divider RS1 and analog front-end module M1
To be independently arranged, but should not be as limit, in some embodiments, it is also possible to which current divider RS1 is integrated to analog front-end module
M1。
Specifically, realizing electric current, information of voltage by internal communication between analog front-end module M1 and MCU processing module M3
And transmission of control instruction, such as I2C communication, UART communication etc., it is preferred that communicated using I2C；In the present embodiment, before simulation
End module M1 uses AFE chip, and the settable protection device of peripheral circuit (such as fuse, TVS etc.), filtering device are (such as electricity
Hinder capacitor), passive equalizing circuit MOS device and temperature collection circuit device, it is of course also possible to which above-mentioned device is integrated to AFE
BQ76940 chip used by chip, such as the present embodiment；And MCU processing module M3 can be selected at MCU processor or ARM
Manage device.
Specifically, battery management system 100 further includes temperature collecting module M2, temperature collecting module M2 and battery pack 1,
MCU processing module M3 and power management module M4 connection, power management module M4 output driving power supply VCC to temperature collecting module
M2, with activationary temperature acquisition module M2, temperature information is simultaneously sent to by the temperature information of temperature collecting module M2 acquisition battery pack 1
MCU processing module M3.In the present embodiment, temperature collecting module M2 is to be independently arranged, in other embodiments can also be by it
It is integrated to analog front-end module M1, therefore should not be as limit.Preferably, 15 batteries of battery pack 1 are divided into three by the present embodiment
A temp probe is arranged in a section between every 5 concatenated batteries, and point 3 tunnels are acquired the temperature of battery pack 1, when
So, different number of temp probe can also be arranged to acquire battery pack 1 according to the number of battery cells and actual needs of battery pack 1
Temperature information.
Specifically, battery management system 100 further includes digital display module M7, digital display module M7 and MCU processing mould
Block M3 is connected with power management module M4, at power management module M4 output driving power supply VCC to digital display module M7, MCU
Manage SOC and remaining capacity that module M3 calculates battery pack 1 according to information of voltage and current information, digital display module M7 display electricity
The SOC and remaining capacity of pond group 1.Wherein, digital display module M7 can be using the aobvious of the types such as LCD display, LED display
Display screen, it is preferred that use LCD display, such as LCD1602, LCD12864 etc..
Specifically, battery management system 100 further includes external communication module M8, external communication module M8 and MCU processing mould
Block M3 is connected with power management module M4, power management module M4 output driving power supply VCC to external communication module M8, and outside is logical
Believe that the SOC of battery pack 1, remaining capacity, information of voltage, current information and temperature information are sent to peripheral control unit by module M8
(not shown), or the configuration information of peripheral control unit is sent to MCU processing module M3；Thereby, battery management system 100 is realized
Online upgrading, parameter configuration and long-range monitoring etc., improve the safety of battery management system 100 and meet emerging operation mode
Application requirement.Wherein, external communication module M8 can use CAN communication or RS485 communication mode, it is preferred that logical using CAN
Letter mode.
It is worth noting that, in the present embodiment, by power management module M4 to MCU processing module M3, temperature acquisition
Module M2, digital display module M7 and external communication module M8 provide driving power VCC, are realized using power management module M4
The state (starting or closing) of MCU processing module M3, temperature collecting module M2, digital display module M7 and external communication module M8
Control, after power management module M4 is activated, MCU processing module M3, temperature collecting module M2, digital display module M7 and outer
Portion communication module M8 could start, after power management module M4 closing, MCU processing module M3, temperature collecting module M2, number
Display module M7 and external communication module M8 is controlled simple and low in energy consumption automatically into closed state.
Referring to Fig. 2, specifically, power management module M4 includes active circuit M43, switching circuit M42 and DC-DC transformation
Circuit M44, the input terminal of switching circuit M42 are connected to battery pack 1, and the output end of switching circuit M42 is connected to DC-DC transformation electricity
The input terminal of road M44, the output end of DC-DC conversion circuit M44 are connected to MCU processing module M3, active circuit M43 induction activation
Signal simultaneously exports high level to switching circuit M42, and switching circuit M42 is connected under the driving of high level so that power supply is via DC-
DC translation circuit M44 is converted to driving power VCC, to activate MCU processing module M3.
Specifically, active circuit M43 includes activation branch and enabled branch parallel with one another, the M3 connection of MCU processing module
To the input terminal of enabled branch, after MCU processing module M3 is activated, output conducting enable signal is to enabled branch so that activation electricity
Road M43 persistently exports high level and realizes self-locking charge or discharge so that switching circuit M42 is connected to switching circuit M42；When putting
When electric switch module M5 and charge switch module M6 are in off-state, MCU processing module M3 output cut-off enable signal is extremely
Enabled branch, controls enabled branch cut-off, and the output end of active circuit M43 becomes low level, power management module from high level
M4 enters closed state.
In the present embodiment, active circuit M43 is by activation signal, conducting enable signal and cut-off enable signal control, tool
Body, activation signal can access signal, external activation signal (PWR_EN) (for example, key switch, filling for load/charger
Electrically activate signal etc.).More specifically, enabled branch includes diode D2, and the anode of diode D2 is connected to MCU processing module
M3, the cathode of diode D2 are connected to switching circuit M42, when MCU processing module M3 exports conducting enable signal to diode D2
When, diode D2 conducting output high level to switching circuit M42, when MCU processing module M3 exports cut-off enable signal to two poles
When pipe D2, diode D2 cut-off；Activation branch includes the first branch and second branch in parallel, and the first branch includes concatenated point
Piezoresistance R4 and diode D4 and be respectively connected to diode D4 cathode diode D3 and divider resistance R6, divider resistance R4
One end connect with diode D4, the cathode of another terminating load or charger, one end of divider resistance R6 and diode D4 connects
It connecing, other end ground connection, the cathode of diode D3 is connected to switching circuit M42, when having load or charger accesses, diode D3
Output high level is connected to switching circuit M42, when not having load, charger access, diode D3 and two poles with diode D4
Pipe D4 cut-off；Preferably, divider resistance R6 is in parallel respectively with capacitor C2 and zener diode D5, and thereby, can play prevents electricity
It presses through big, it is ensured that the stable effect of branch voltage；Second branch includes concatenated divider resistance R7 and diode D6, divider resistance
One end of R7 is connect with diode D6, another termination external activation signal, divider resistance R7 and diode D6 composition branch with
The branch circuit parallel connection of divider resistance R4 and diode D4 composition, second branch and the first branch share divider resistance R4 and diode D4
Except built-up circuit, when external activation signal input when, diode D6 and diode D3 are connected and export high level, no outside
When activation signal inputs, diode D6 and diode D3 cut-off.
Specifically, switching circuit M42 includes field-effect tube Q2 and field-effect tube Q1, the pole D of field-effect tube Q2 is connected to
The pole G of the pole G of field-effect tube Q1, field-effect tube Q2 is connect with one end of divider resistance R3, divider resistance R5 respectively, divider resistance
The other end of R3 is connected to the cathode of diode D2, diode D3, the other end ground connection of divider resistance R5, the S of field-effect tube Q2
Pole ground connection, divider resistance R3, divider resistance R5 are for preventing the electric current for flowing through field-effect tube Q2 excessive, protection field-effect tube Q2,
Driving voltage is provided simultaneously for field-effect tube Q2；Resistance is in series between the pole G of field-effect tube Q1 and the pole D of field-effect tube Q2
The pole S of R2, field-effect tube Q1 are connect with the cathode of capacitor C1, one end of resistance R1 and zener diode D1 respectively, field-effect tube
The pole G of Q1 is connect with the anode of capacitor C1, the other end of resistance R1 and zener diode D1 respectively, and the pole S of field-effect tube Q1 connects
It is connected to battery pack 1, the pole D of field-effect tube Q1 connects DC-DC conversion circuit M44.
Preferably, power management module M4 further includes filter circuit M41, and one end of filter circuit M41 is connected to battery pack
1, the other end is connected to the input terminal of switching circuit M42.
Specifically, power management module M4 further includes Acquisition Circuit M45, one end of Acquisition Circuit M45 is connected to activation branch
Road, the other end of Acquisition Circuit M45, which is connected to MCU processing module M3, MCU processing module M3 and acquires by Acquisition Circuit M45, to swash
The node voltage of live circuit M43, and compared with threshold voltage, when node voltage is greater than or equal to threshold voltage, discharge switch
Module M5 and charge switch module M6 are kept closed, and battery pack 1 continues charge or discharge；When node voltage is less than threshold value electricity
When pressure, analog front-end module M1 controls discharge switch module M5 and charge switch mould according to the control instruction of MCU processing module M3
Block M6 is disconnected, and battery pack 1 stops charge or discharge.
More specifically, Acquisition Circuit M45 includes divider resistance R8, divider resistance R10, and one end of divider resistance R8 is connected to
The cathode of diode D4 and diode D6, the other end are connect with one end of divider resistance R10, another termination of divider resistance R10
Ground；Preferably, divider resistance R10 is also parallel with the RC filter circuit of connecting being made of resistance R9 with capacitor C3, and capacitor C3 is grounded,
MCU processing module M3 is connected between resistance R9 and capacitor C3.Voltage (the ADC_ that MCU processing module M3 passes through acquisition resistance R9
POW), the variation of the cathode voltage of diode D4 and diode D6 is judged according to the voltage change of resistance R9.
Below with reference to Fig. 1 and Fig. 2, the course of work of battery management system 100 is described by taking the specific embodiment of the invention as an example.
Firstly, after active circuit M43 senses load/charger access signal or external activation signal, active circuit M43
Conducting output high level makes switching circuit M42 conducting, after switching circuit M42 is connected, DC-DC conversion circuit to switching circuit M42
M44 output driving power supply VCC is to give MCU processing module M3, temperature collecting module M2, digital display module M7 and PERCOM peripheral communication mould
Block M8 power supply, to activate MCU processing module M3, temperature collecting module M2, digital display module M7 and external communication module M8,
MCU processing module M3 exports high level signal (wake-up signal) to analog front-end module M1, to start analog front-end module M1；It connects
, analog front-end module M1 acquires the information of voltage and current information of battery pack 1, and information of voltage and current information are sent to
MCU processing module M3, MCU processing module M3 calculates analysis information of voltage, current information, if information of voltage and current information are just
Often and 100 self-test of battery management system is normal, output control instruction to analog front-end module M1, and analog front-end module M1 control is put
Electric switch module M5 and charge switch module M6 closure, at the same time, MCU processing module M3 output conducting enable signal is to enabled
Branch makes active circuit M43 export high level persistently to realize self-locking charge or discharge；Then, the Acquisition Circuit M45 period acquires
The node voltage of active circuit M43 is simultaneously sent to MCU processing module M3, MCU processing module M3 for node voltage and threshold voltage
It is compared, if node voltage is greater than or equal to threshold voltage, continues to output conducting enable signal to enabled branch, if section
Point voltage is less than threshold voltage, and MCU processing module M3 exports control instruction to analog front-end module M1, analog front-end module M1 control
Discharge switch module M5 and charge switch module M6 processed are disconnected；Then, MCU processing module M3 exports low level signal to controlling mould
So that analog front-end module M1 is closed, MCU processing module M3's quasi- front-end module M1 is delayed after certain time (such as 3 seconds), and output is cut
Only enable signal closes power management module M4, power management module M4 stops feed drive power supply to active circuit M43
VCC is to MCU processing module M3, temperature collecting module M2, digital display module M7 and external communication module M8, battery management system
100 in similar off-mode.
Compared with prior art, MCU processing module M3 of the invention and analog front-end module M1 and power management module M4
Connection, by load/charger from when the removal of battery management system 100 or external activation blackout, MCU processing module M3 is controlled
Analog front-end module M1 disconnects discharge switch module M5 and charge switch module M6, then, MCU processing module M3 control simulation
Front-end module M1 is closed and is exported cut-off enable signal to power management module M4, closes power management module M4, MCU processing
Module M3 is also automatically into closed state, so that battery management system 100 is equivalent into off-mode, entire cell tube
The power consumption of reason system 100 is very low.Moreover, the MCU processing module M3 that the present invention is arranged can be according on analog front-end module M1
The information of voltage and current information of the battery pack 1 of biography accurately calculate the SOC and remaining capacity of battery, and by digital display module
M7 shows the SOC and remaining capacity of battery, and the reliability of battery management system 100 and safety are higher, can be suitable for concentrating
The emerging operation modes such as charging lease charge.
Above disclosed is only presently preferred embodiments of the present invention, cannot limit the right of the present invention with this certainly
Range, therefore equivalent changes made in accordance with the claims of the present invention still fall within the range that the present invention is covered.
Claims (11)
1. a kind of battery management system, for monitoring the state and control battery pack of battery pack, which is characterized in that including：Connection
In the both ends of the battery pack power management module, connect with the power management module MCU processing module, with it is described
MCU processing module connection analog front-end module, discharge switch module and charge switch module, the discharge switch module and
Charge switch module is connect at least one of the MCU processing module and analog front-end module respectively；The power management mould
For block for incuding activation signal with output driving power supply to the MCU processing module, the MCU processing module exports wake-up signal
To the analog front-end module to start the analog front-end module, the MCU processing module controls the discharge switch module
And/or the control instruction control that charge switch module closure or the analog front-end module are sent according to the MCU processing module
Make the discharge switch module and/or charge switch module closure；When the activation signal disappears, the MCU processing module
It controls the discharge switch module and/or charge switch module disconnects or the analog front-end module is handled according to the MCU
The control instruction that module is sent controls the discharge switch module and/or charge switch module disconnects, the MCU processing module control
It makes the analog front-end module to close, the MCU processing module output cut-off enable signal is to the power management module to control
The power management module is made to close.
2. battery management system as described in claim 1, which is characterized in that the discharge switch module and charge switch module
It is connect with the analog front-end module.
3. battery management system as claimed in claim 2, which is characterized in that the charge switch module and the MCU are handled
Module connection, the MCU processing module, which produces, forces cut-off signal and the pressure cut-off signal is sent to the charging
Switch module is disconnected with controlling the charge switch module.
4. battery management system as described in claim 1, which is characterized in that the analog front-end module is also connected with shunting
Device, the analog front-end module acquire the information of voltage of the battery pack and acquire the electricity of the battery pack by the current divider
Stream information.
5. battery management system as claimed in claim 4, which is characterized in that further include digital display module, the number is aobvious
Show that module is connect with the MCU processing module and power management module, the power management module exports the driving power extremely
The digital display module, the MCU processing module calculate the SOC of the battery pack according to the information of voltage and current information
And remaining capacity, the digital display module show the SOC and remaining capacity of the battery pack.
6. battery management system as claimed in claim 5, which is characterized in that further include external communication module, the outside is logical
Letter module is connect with the MCU processing module and power management module, and the power management module exports the driving power extremely
The SOC of the battery pack and remaining capacity are sent to peripheral control unit by the external communication module, the external communication module.
7. battery management system as described in claim 1, which is characterized in that further include temperature collecting module, the temperature is adopted
Collection module is connect with the battery pack, MCU processing module and power management module, and the power management module exports the driving
To the temperature collecting module, the temperature collecting module acquires the temperature information of the battery pack and believes the temperature power supply
Breath is sent to the MCU processing module.
8. battery management system as described in claim 1, which is characterized in that the power management module include active circuit,
Switching circuit and DC-DC conversion circuit, the input terminal of the switching circuit are connected to the battery pack, the switching circuit it is defeated
Outlet is connected to the input terminal of the DC-DC conversion circuit, and the output end of the DC-DC conversion circuit is connected at the MCU
Manage module, the active circuit incudes the activation signal and exports high level to the switching circuit, the switching circuit in
Conducting is so that power supply is converted to the driving power via the DC-DC conversion circuit under the driving of the high level.
9. battery management system as claimed in claim 8, which is characterized in that the active circuit includes activation parallel with one another
Branch and enabled branch, the MCU processing module are connected to the input terminal of the enabled branch, and the MCU processing module is swashed
After work, output conducting enable signal is to the enabled branch so that the active circuit persistently exports high level to the switch electricity
Road, when the discharge switch module and charge switch module are in off-state, the MCU processing module output cut-off makes
Can signal to the enabled branch.
10. battery management system as claimed in claim 9, which is characterized in that the power management module further includes acquisition electricity
Road, one end of the Acquisition Circuit are connected to the activation branch, and the other end of the Acquisition Circuit is connected to the MCU processing
Module, the MCU processing module acquire the node voltage of the active circuit by the Acquisition Circuit, and with threshold voltage ratio
Compared with when the node voltage is greater than or equal to the threshold voltage, the discharge switch module and/or charge switch module are protected
Hold closed state；When the node voltage is less than the threshold voltage, the discharge switch module and/or charge switch module
It is disconnected by control.
11. battery management system as described in claim 1, which is characterized in that the activation signal includes that load/charger connects
Enter signal and/or external activation signal.
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|---|---|---|---|
| CN201810650465.XA CN108819752A (en) | 2018-06-22 | 2018-06-22 | Battery management system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810650465.XA CN108819752A (en) | 2018-06-22 | 2018-06-22 | Battery management system |
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| CN108819752A true CN108819752A (en) | 2018-11-16 |
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