CN110768346A - Motor-driven battery pack management system - Google Patents
Motor-driven battery pack management system Download PDFInfo
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- CN110768346A CN110768346A CN201911206795.0A CN201911206795A CN110768346A CN 110768346 A CN110768346 A CN 110768346A CN 201911206795 A CN201911206795 A CN 201911206795A CN 110768346 A CN110768346 A CN 110768346A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/371—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with remote indication, e.g. on external chargers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a battery pack management system driven by a motor, which comprises a lithium battery pack, a control module, a charge-discharge module and a detection protection module, wherein the charge-discharge module comprises an adapter power supply interface and a battery power supply port, the positive terminal of the adapter power supply interface is connected with a +5V power supply circuit and an input end PW1 of a battery charging control circuit through a DC-DC booster circuit and a constant-voltage constant-current step-down circuit in sequence, and the detection protection module comprises a charge-discharge detection circuit, an over-temperature detection circuit, a current detection control circuit and a voltage detection control circuit. The level of managing and monitoring the lithium battery pack is effectively improved, and the whole reliable protection is formed.
Description
Technical Field
The invention relates to the technical field of battery management, in particular to a battery pack management system driven by a motor.
Background
The lithium battery has the characteristics of long service life, small self-discharge effect, large single battery terminal voltage, high energy density, no memory effect and the like, becomes one of mainstream batteries, and is widely applied. The large-capacity lithium battery pack has a complex structure and a large number of batteries, and increases the protection difficulty. At present, many lithium battery packs on the market do not have a protection function, the battery is overcharged, the battery is overdischarged, and when the output short circuit occurs, the lithium battery is caused to generate heat, the temperature is too high, and the battery is damaged or even causes a fire hazard. Therefore, the direct current motor or the direct current power supply module cannot be directly supplied with power, and the direct current motor or the direct current power supply module can be normally used only by adding battery management protection.
The present invention provides a new solution to this problem.
Disclosure of Invention
In view of the above, it is an object of the present invention to provide a battery pack management system for a motor drive to overcome the drawbacks of the prior art.
The technical scheme for solving the problem is as follows: the motor-driven battery pack management system comprises a lithium battery pack, a control module, a charge-discharge module and a detection protection module, wherein the lithium battery pack comprises at least 1 lithium battery, and the control module comprises a controller U4 and an analog switch chip U5 which are connected through a serial port; the charging and discharging module comprises an adapter power supply interface and a battery power supply port, the positive end of the adapter power supply interface is connected with a +5V power supply circuit and the input end PW1 of a battery charging control circuit sequentially through a DC-DC boost circuit and a constant-voltage constant-current buck circuit, the control end of the battery charging control circuit is connected with the output end P10 of the controller, the adapter power supply interface and the positive end of the lithium battery pack are connected with the battery power supply port M + through diodes D1 and D2 respectively, the +5V power supply circuit is used for supplying power to the control module and the detection protection module, and the battery charging control circuit is used for controlling the charging state of the lithium battery pack; the detection protection module comprises: the charging and discharging detection circuit is used for detecting the charging and discharging state of the lithium battery pack; the over-temperature detection circuit is used for detecting the temperature of the lithium battery pack during working; the current detection control circuit is used for detecting the output current of the lithium battery pack and controlling the output state of the battery power supply port through a controller; and the voltage detection control circuit is used for detecting the output voltage of the lithium battery pack and the output voltage of the over-temperature detection circuit and controlling the charging state of the lithium battery pack through the controller.
Further, the DC-DC boost circuit includes a boost chip U1, a pin 3 of the boost chip U1 is connected to one end of an inductor L2 and the anode of a diode D3, the other end of the inductor L2 is connected to one ends of capacitors C7 and EC3, the cathode of the diode D4 and a pin 4 of the boost chip U1, the anode of a diode D4 is connected to the anode of the adapter power interface, the other ends of the capacitors C7 and EC3 and a pin 1 of the boost chip U1 are connected to the cathode of the adapter power interface, the pin 3 of the boost chip U1 is further connected to one ends of a resistor R4 and a capacitor EC2 through a diode D3, the other end of the resistor R4 is connected to one end of a resistor R6 and a pin 5 of the boost chip U1, and the other ends of the resistor R6 and the capacitor EC2 are grounded.
Further, the constant-voltage constant-current step-down circuit comprises a voltage stabilizing chip U2, a pin 2 of the voltage stabilizing chip U2 is connected with one ends of capacitors C5 and EC2, a pin 1 of the voltage stabilizing chip U2 is connected with one ends of a resistor R2, a capacitor C2 and an inductor L1 and a drain of a MOS transistor Q1, the other end of the resistor R2 is grounded through a capacitor C1, the other end of a capacitor C2 is connected with a pin 5 of the voltage stabilizing chip U2, the other end of the inductor L1 is connected with one ends of resistors R1, R3 and a capacitor C3 and a pin 6 of the voltage stabilizing chip U3, the other ends of the resistors R3 and R3 are connected with one ends of the capacitors C3 and EC3 and a pin 7 of the voltage stabilizing chip U3, the other ends of the capacitors C3, C3 and EC3 are grounded, and a pin 3 of the voltage stabilizing. Pin 4 of the voltage stabilization chip U2 is connected to the gate of the MOS transistor Q1, the source of the MOS transistor Q1 is grounded, pin 7 of the voltage stabilization chip U2 is connected to one end of the capacitor C6 and the resistor R5 and the anode of the diode D5, and pin 8 of the voltage stabilization chip U2 is connected to the other end of the capacitor C6 and the resistor R5 and is grounded through the resistors R7 and R8 which are connected in parallel.
Furthermore, the +5V power supply circuit comprises a buck chip U3, a pin 1 of the buck chip U3 is grounded through parallel capacitors C10 and C11 and is connected with the cathode of a diode D6 through resistors R11, R10, R9, R12 and R14 in sequence, the anode of the diode D6 is connected with the cathode of D5, a pin 2 of the buck chip U3 is grounded, a pin 3 of the buck chip U3 is connected with a +5V power supply port and is grounded through parallel capacitors C12 and C20.
Further, the battery charging control circuit comprises a MOS transistor Q9, a drain of the MOS transistor Q9 is connected to cathodes of diodes D5 and D9 and one end of a resistor R43, a source of the MOS transistor Q9 is connected to a positive terminal of the lithium battery pack and is connected to a cathode of the D6 through a diode D8, a gate of the MOS transistor Q9 is connected to an anode of a diode D9 through a resistor R41, the other end of the resistor R43 and one end of a resistor R45, the other end of the resistor R45 is connected to a collector of a triode Q11, a base of the triode Q11 is connected to one ends of the resistors R49 and R51, the other end of the resistor R49 is connected to an output terminal P10 of the controller, and an emitter of the triode Q11 and the other end of the resistor R51 are.
Further, the charge and discharge detection circuit comprises a triode Q10, a collector of the triode Q10 is connected with the input end AN1 of the controller through a resistor R42, a base of the triode Q10 is connected with one end of resistors R21 and R40, the other end of the resistor R21 is connected with the positive end of the adapter power interface through a voltage regulator tube DZ1, and AN emitter of the triode Q10 and the other end of the resistor R40 are grounded.
Furthermore, the over-temperature detection circuit comprises a thermistor NTC arranged in the lithium battery pack, a power supply end of the thermistor NTC is connected with a +5V power supply port, and an output end of the thermistor NTC is connected with input ends of the controller U4 and the analog switch chip U5.
Further, the current detection control circuit comprises a MOS transistor Q12 connected to the battery power supply port M-, a gate of a MOS transistor Q12 connected to the output terminal P9 of the controller U4 through a resistor R53, a source of the MOS transistor Q12 connected to ground through a resistor C32, a resistor R57, and a resistor R58 connected in parallel, and connected to the base of the transistor Q13, the pin 17 of the controller U4, the resistor R55, and one end of a capacitor C31 through a resistor R56, a collector of the transistor Q13 connected to one end of the capacitor C29 and the pin 19 of the controller U4 through a resistor R52, and an emitter of the transistor Q13 connected to the other ends of the resistor R55, the capacitor C31, and the capacitor C29 connected in parallel to ground.
Furthermore, the voltage detection control circuit comprises a plurality of detection branches with the same structure, each detection branch comprises an MOS (metal oxide semiconductor) tube Qj, the grid electrodes of the MOS tubes Qj are connected with a pin 2 of the controller U4 through a resistor R54, the drain electrodes of the MOS tubes Qj are connected through a resistor Rn and only connected with the anode of one lithium battery which is different from each other, the source electrodes of the MOS tubes Qj are grounded through a resistor Rm and connected with one end of a capacitor Cq and the input end of the analog switch chip through a resistor Rp, and the other end of the capacitor Cq is grounded.
Furthermore, the electric quantity indicating circuit comprises indicating lamps L3, L4, L5 and L6, the anodes of the indicating lamps L3, L4, L5 and L6 are respectively connected with the output end of the controller through resistors R36, R37, R38 and R39, and the cathodes of the indicating lamps L3, L4, L5 and L6 are grounded.
Through the technical scheme, the invention has the beneficial effects that:
1. when the adapter is connected, the charging voltage is provided for the lithium battery pack, and the voltage is provided for the output direct current motor or the load, so that the service life of the lithium battery pack is prolonged;
2. through the DC-DC booster circuit and the constant-voltage constant-current voltage reduction circuit, the input voltage and the output voltage can work normally when being close to each other, the lithium battery pack can be protected more reliably, and adapters with more specifications can be matched;
3. in the working process of charging and discharging of the lithium battery pack, the controller detects the electric quantity of the battery by controlling the MOS tube Qj; when the lithium battery pack does not work, the controller MCU enters standby sleep through mode switching to reduce the standby current of the lithium battery pack, and the lithium battery pack can still work normally after being kept still for a long time;
4. the controller controls an EN enabling pin of the boost chip through high and low levels, and the DC-DC boost circuit does not work after the battery is fully charged, so that the service life of components of the DC-DC boost circuit is prolonged;
5. the electric quantity indicating circuit displays the electric quantity of the battery during working in real time, so that the current electric quantity state of the lithium battery pack can be conveniently known;
6. the lithium battery pack monitoring system has the functions of battery overvoltage protection, undervoltage protection, over-temperature protection, short-circuit protection and the like, effectively improves the level of management and monitoring of the lithium battery pack, and forms integral reliable protection.
Drawings
Fig. 1 is a circuit configuration diagram of a lithium battery pack according to the present invention.
FIG. 2 is a schematic diagram of the connection between the DC-DC boost circuit and the constant voltage and constant current buck circuit of the present invention.
FIG. 3 is a schematic diagram of the connection between the +5V power supply circuit and the battery charging control circuit according to the present invention.
FIG. 4 is a schematic diagram of a charge/discharge detection circuit according to the present invention.
FIG. 5 is a schematic diagram of the connection between the control module and the over-temperature detection circuit, and between the current detection control circuit and the voltage detection control circuit.
Fig. 6 is a control schematic of the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1 to 6. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
The invention discloses a motor-driven battery pack management system, which comprises a lithium battery pack J2, a control module, a charge-discharge module and a detection protection module, wherein the lithium battery pack J2 comprises at least 1 lithium battery, as shown in figure 1, seven lithium batteries B1-B7 are taken as an example in the invention, and the seven lithium batteries can supply power to a motor and a load. The control module comprises a controller U4 and an analog switch chip U5 which are connected through serial ports.
The charging and discharging module comprises an adapter power interface J1 and a battery power supply port J4, the positive end of the adapter power interface J1 sequentially passes through a DC-DC booster circuit, a constant-voltage constant-current voltage reduction circuit is connected with a +5V power supply circuit and the input end PW1 of a battery charging control circuit, the control end of the battery charging control circuit is connected with the output end P10 of a controller U4, the adapter power interface J1 and the positive end of a lithium battery pack are respectively connected with a battery power supply port M + (M + M) through diodes D1 and D2, the +5V power supply circuit is used for supplying power to the control module and the detection protection module, and the battery charging control circuit is used for controlling the charging state of the lithium. The adapter power interface J1 is used for providing charging voltage for the lithium battery pack after being switched on, and simultaneously provides voltage for the output direct current motor or the load, and meanwhile, when the adapter is insufficient in power supply, the lithium battery pack supplies power for the motor and the load in a supplementing mode.
The detection protection module comprises: the charging and discharging detection circuit is used for detecting the charging and discharging state of the lithium battery pack; the over-temperature detection circuit is used for detecting the temperature of the lithium battery pack during working; the current detection control circuit is used for detecting the output current of the lithium battery pack and controlling the output state of the battery power supply port through the controller U4; and the voltage detection control circuit is used for detecting the output voltage of the lithium battery pack and the output voltage of the over-temperature detection circuit and controlling the charging state of the lithium battery pack through the controller U4.
As shown in fig. 2, the DC-DC boost circuit includes a boost chip U1, a pin 3 of the boost chip U1 is connected to one end of an inductor L2 and the anode of a diode D3, the other end of an inductor L2 is connected to one end of capacitors C7 and EC3, the cathode of a diode D4 and a pin 4 of the boost chip U1, the anode of a diode D4 is connected to the anode of an adapter power interface J1, the other ends of capacitors C7 and EC3 and a pin 1 of a boost chip U1 are connected to the cathode of an adapter power interface J1, a pin 3 of the boost chip U1 is further connected to one end of a resistor R4 and a capacitor EC2 through a diode D3, the other end of a resistor 686r 9 is connected to one end of a resistor R6 and a pin 5 of a boost chip U1, and the other ends of the resistor R6 and the capacitor EC. After the power supply interface J1 of the adapter is connected, the output voltage of the adapter is sent to the pin 4 of the boost chip U1, so that the DC-DC boost circuit boosts the DC voltage and supplies power to the constant-voltage constant-current step-down circuit. The pin 6 of the controller controls an EN enabling pin of the boost chip U1 through high and low levels, and when the battery is fully charged, the DC-DC boost circuit does not work, so that the service life of components of the DC-DC boost circuit is prolonged.
The constant-voltage constant-current voltage reduction circuit comprises a voltage stabilization chip U2, a pin 2 of the voltage stabilization chip U2 is connected with one ends of capacitors C5 and EC2, a pin 1 of the voltage stabilization chip U2 is connected with a resistor R2, a capacitor C2, one end of an inductor L1 and a drain electrode of a MOS transistor Q1, the other end of a resistor R2 is grounded through a capacitor C1, the other end of a capacitor C2 is connected with a pin 5 of the voltage stabilization chip U2, the other end of an inductor L1 is connected with one ends of resistors R1, R3, one end of the capacitor C3 and a pin 6 of the voltage stabilization chip U3, the other ends of the resistors R3 and R3 are connected with one ends of the capacitors C3 and the pin 7 of the voltage stabilization chip U3, the other ends of the capacitors C3, the EC3 and the other end of the EC3 are grounded. Pin 4 of the voltage stabilization chip U2 is connected to the gate of the MOS transistor Q1, the source of the MOS transistor Q1 is grounded, pin 7 of the voltage stabilization chip U2 is connected to one end of the capacitor C6 and the resistor R5 and the anode of the diode D5, and pin 8 of the voltage stabilization chip U2 is connected to the other end of the capacitor C6 and the resistor R5 and is grounded through the resistors R7 and R8 which are connected in parallel. The output voltage of the voltage boosting chip U1 is processed in the pin 2 of the voltage stabilizing chip U2 after being filtered by the capacitor, the voltage stabilizing chip U2 adopts the voltage reduction principle, and constant-voltage constant-current output guarantees constant-current-constant-voltage charging to the lithium battery pack, and the lithium battery pack is prevented from being overcharged.
As shown in fig. 3, the +5V power supply circuit includes a buck chip U3, pin 1 of the buck chip U3 is grounded through parallel capacitors C10 and C11, and is connected to the cathode of a diode D6 through resistors R11, R10, R9, R12 and R14 in sequence, the anode of the diode D6 is connected to the cathode of D5, pin 2 of the buck chip U3 is grounded, pin 3 of the buck chip U3 is connected to a +5V power supply port, and is grounded through parallel capacitors C12 and C20. When the adapter is used specifically, two +5V power supply modes are formed, namely, when the adapter is connected, the adapter supplies power, the power supply voltage of the adapter is processed by the DC-DC booster circuit, the constant-voltage constant-current voltage reduction circuit and the voltage reduction chip U3 in sequence, and then the +5V power is output to be used for supplying power to the control module and the detection protection module. When the adapter is disconnected, the lithium battery pack outputs +5V power for supplying power to the control module and the detection protection module after being processed by the voltage reduction chip U3.
The battery charging control circuit comprises a MOS tube Q9, the drain electrode of the MOS tube Q9 is connected with the negative electrodes of diodes D5 and D9 and one end of a resistor R43, the source electrode of the MOS tube Q9 is connected with the positive electrode end of a lithium battery pack and is connected with the negative electrode of D6 through a diode D8, the grid electrode of the MOS tube Q9 is connected with the anode of the diode D9, the other end of the resistor R43 and one end of a resistor R45 through a resistor R41, the other end of the resistor R45 is connected with the collector electrode of a triode Q11, the base electrode of the triode Q11 is connected with one ends of resistors R49 and R51, the other end of the resistor R49 is connected with the output end P10 of a controller U4, and the emitter electrode of the triode Q. The battery charging control circuit manages the lithium battery pack in the charging process, and if the lithium battery pack is in an overvoltage, an undervoltage, an overtemperature and other abnormal conditions, the output end P10 of the controller U4 outputs a high level signal to enable the triode Q11 to be conducted, so that the MOS transistor Q9 is cut off due to grid short circuit, then the charging is closed, the effect of protecting the lithium battery pack is achieved, and the charging is recovered until the abnormal condition is removed.
As shown in fig. 4, the charge and discharge detection circuit includes a transistor Q10, a collector of the transistor Q10 is connected to AN input terminal AN1 of the controller U4 through a resistor R42, a base of the transistor Q10 is connected to one end of resistors R21 and R40, the other end of the resistor R21 is connected to a positive terminal of the adapter power interface J1 through a voltage regulator DZ1, and AN emitter of the transistor Q10 and the other end of the resistor R40 are grounded. The charging and discharging detection circuit realizes the detection of whether the adapter is accessed, so that whether the lithium battery pack is charged or discharged is distinguished. For example, when the adapter is connected, the output voltage of the adapter is stabilized by the voltage regulator DZ1 and then drives the transistor Q10 to conduct, so that the input terminal AN1 of the controller U4 obtains a low level signal, and the controller U4 operates in a charging mode. Conversely, when the adapter is unplugged, the AN1 is getting a high signal and the controller U4 is operating in the discharging mode.
As shown in FIG. 5, the over-temperature detection circuit comprises a thermistor NTC arranged in the lithium battery pack, wherein the power supply end of the thermistor NTC is connected with a +5V power supply port, and the output end of the thermistor NTC is connected with the input ends of the controller U4 and the analog switch chip U5. When the lithium battery pack is charged or discharged, the pin 13 of the controller U4 outputs low level, the temperature is converted into voltage through the NTC to be supplied to the chip U5, then the temperature is detected and judged by the chip U5 to be converted into the 16 pins of the MCU, when the detection value exceeds the system safety value, the controller U4 carries out over-temperature protection on the lithium battery pack, the power supply of the motor and the load is shut down, and when the temperature is recovered, the motor and the load are powered again.
The current detection control circuit comprises a MOS tube Q12 connected with a battery power supply port M-, the grid of a MOS tube Q12 is connected with the output end P9 of a controller U4 through a resistor R53, the source of the MOS tube Q12 is grounded through a resistor C32, a resistor R57 and a resistor R58 which are connected in parallel, the source of the MOS tube Q12 is connected with the base of a triode Q13 through a resistor R56, the pin 17 and one end of a resistor R55 and a capacitor C31 of the controller U4, the collector of the triode Q13 is connected with one end of a capacitor C29 and the pin 19 of the controller U4 through the resistor R52, and the emitter of the triode Q13 is connected with the other ends of the resistor R55, the capacitor C31 and the. The current detection control circuit adopts a resistor to detect current, signals are fed back to the main control module through the triode Q13 to be processed in an interruption mode, then output is controlled, and meanwhile the controller carries out AD sampling on base signals of the triode Q13. When the lithium battery pack is over-temperature, output over-current or motor short circuit, the pin 9 of the controller U4 outputs low level, the MOS tube Q12 is cut off, and the power supply output of the lithium battery pack is closed, so that the motor is protected.
The voltage detection control circuit comprises a plurality of detection branch circuits with the same structure, each detection branch circuit comprises an MOS (metal oxide semiconductor) tube Qj, the grid electrodes of the MOS tubes Qj are connected with a pin 2 of a controller U4 through a resistor R54, the drain electrodes of the MOS tubes Qj are connected through a resistor Rn and only connected with the anode of one lithium battery different from each other, the source electrodes of the MOS tubes Qj are grounded through a resistor Rm, one end of a capacitor Cq and the input end of an analog switch chip U5 are connected through a resistor Rp, and the other end of the capacitor Cq is grounded. The number of the detection branches is the same as that of the lithium batteries, namely the detection branches comprise 7 MOS (metal oxide semiconductor) tubes Qj, j epsilon (2, 3, 4, 5, 6, 7 and 8); 7 resistances Rn, n ∈ (15, 16, 17, 18, 19, 20, 21); 7 resistances Rm, me ∈ (30, 31,32,33,34,35, 36); 7 resistances Rp, p ∈ (22, 23, 24, 25, 26, 27, 28); 7 capacitances Cq, q ∈ (13, 14, 15, 16, 17, 18, 19). In the process of charging and discharging of the lithium battery pack, a pin 2 of the controller U4 outputs a high level, so that a grid electrode of the MOS tube Qj is electrified and conducted, the positive voltage of the lithium battery B1-B7 sequentially passes through the resistor Rn and the MOS tube Qj and is input into the analog switch chip U5 for detecting the voltage of each lithium battery in the lithium battery pack, a signal is fed back to the MCU of the controller U4 according to a positive ratio, and the MCU is compared with a preset threshold value, so that the electric quantity of each lithium battery is judged.
The electric quantity indicating circuit comprises indicating lamps L3, L4, L5 and L6, anodes of the indicating lamps L3, L4, L5 and L6 are respectively connected with the output end of the controller U4 through resistors R36, R37, R38 and R39, and cathodes of the indicating lamps L3, L4, L5 and L6 are grounded. In the discharging process of the lithium battery pack, in order to reduce standby power consumption, only when the controller U4 detects that discharging current flows, the MCU of the controller U4 is awakened to work, and when the adapter is not connected, the MCU is in a power saving mode, so that the standby current of the battery is reduced. The battery capacity is detected by the voltage detection circuit, and the battery capacity is displayed by indicating, namely, the indicator lights L3, L4, L5 and L6 are respectively lighted when the battery pack capacity is 25%, 50%, 75% and 100%.
In summary, the invention provides charging voltage for the lithium battery pack when the adapter is connected, and provides voltage for the output direct current motor or the load, which is helpful for prolonging the service life of the lithium battery pack. The controller reduces the standby current of the battery through mode switching, ensures that the lithium battery can normally work after being statically placed for a long time, has the functions of battery overvoltage protection, undervoltage protection, over-temperature protection, short-circuit protection and the like, effectively improves the level of lithium battery pack management and monitoring, and forms integral reliable protection.
While the invention has been described in further detail with reference to specific embodiments thereof, it is not intended that the invention be limited to the specific embodiments thereof; for those skilled in the art to which the present invention pertains and related technologies, the extension, operation method and data replacement should fall within the protection scope of the present invention based on the technical solution of the present invention.
Claims (10)
1. Motor drive's battery package management system, including lithium cell package, control module, charge-discharge module and detection protection module, its characterized in that: the lithium battery pack comprises at least 1 lithium battery, and the control module comprises a controller U4 and an analog switch chip U5 which are connected through a serial port;
the charging and discharging module comprises an adapter power supply interface and a battery power supply port, the positive end of the adapter power supply interface is connected with a +5V power supply circuit and the input end PW1 of a battery charging control circuit sequentially through a DC-DC boost circuit and a constant-voltage constant-current buck circuit, the control end of the battery charging control circuit is connected with the output end P10 of the controller, the adapter power supply interface and the positive end of the lithium battery pack are connected with the battery power supply port M + through diodes D1 and D2 respectively, the +5V power supply circuit is used for supplying power to the control module and the detection protection module, and the battery charging control circuit is used for controlling the charging and discharging state of the lithium battery pack;
the detection protection module comprises:
the charging and discharging detection circuit is used for detecting the charging and discharging state of the lithium battery pack;
the over-temperature detection circuit is used for detecting the temperature of the lithium battery pack during working;
the current detection control circuit is used for detecting the output current of the lithium battery pack and controlling the output state of the battery power supply port through a controller;
and the voltage detection control circuit is used for detecting the output voltage of the lithium battery pack and the output voltage of the over-temperature detection circuit and controlling the charging state of the lithium battery pack through the controller.
2. The motor-driven battery pack management system according to claim 1, wherein: the DC-DC booster circuit comprises a booster chip U1, a pin 3 of a booster chip U1 is connected with one end of an inductor L2 and the anode of a diode D3, the other end of the inductor L2 is connected with one end of capacitors C7 and EC3, the cathode of a diode D4 and a pin 4 of the booster chip U1, the anode of a diode D4 is connected with the anode of the adapter power interface, the other ends of the capacitors C7 and EC3 and a pin 1 of a booster chip U1 are connected with the cathode of the adapter power interface, a pin 3 of a booster chip U1 is further connected with one ends of a resistor R4 and a capacitor EC2 through a diode D3, the other end of the resistor R4 is connected with one end of a resistor R6 and a pin 5 of a booster chip U1, and the other ends of the resistor R6 and the capacitor EC2 are grounded.
3. The motor-driven battery pack management system according to claim 2, wherein: the constant-voltage constant-current step-down circuit comprises a voltage stabilizing chip U2, a pin 2 of a voltage stabilizing chip U2 is connected with one ends of capacitors C5 and EC2, a pin 1 of the voltage stabilizing chip U2 is connected with a resistor R2, a capacitor C2, one end of an inductor L1 and a drain electrode of a MOS tube Q1, the other end of the resistor R2 is grounded through a capacitor C1, the other end of the capacitor C2 is connected with a pin 5 of a voltage stabilizing chip U2, the other end of the inductor L1 is connected with resistors R1, R3, one end of a capacitor C3 and a pin 6 of a voltage stabilizing chip U2, the other ends of the resistors R1 and R3 are connected with one ends of capacitors C4 and EC1 and a pin 7 of a voltage stabilizing chip U2, the other ends of the capacitors C3, C4 and EC1 are grounded, a pin 3 of the voltage stabilizing chip U1 is grounded through a capacitor C1, a pin 4 of the voltage stabilizing chip U1 is connected with a gate of the MOS tube Q1, a source electrode of the MOS tube Q1, a positive electrode of the voltage stabilizing chip U1 and a, The other end of the resistor R5 is grounded through the parallel resistors R7 and R8.
4. A motor-driven battery pack management system according to claim 3, wherein: the +5V power supply circuit comprises a voltage reduction chip U3, a pin 1 of a voltage reduction chip U3 is grounded through capacitors C10 and C11 which are connected in parallel, and is connected with the cathode of a diode D6 through resistors R11, R10, R9, R12 and R14 in sequence, the anode of the diode D6 is connected with the cathode of a diode D5, a pin 2 of the voltage reduction chip U3 is grounded, a pin 3 of the voltage reduction chip U3 is connected with a +5V power supply port, and is grounded through capacitors C12 and C20 which are connected in parallel.
5. The motor-driven battery pack management system according to claim 4, wherein: the battery charging control circuit comprises a MOS tube Q9, the drain electrode of the MOS tube Q9 is connected with the negative electrodes of diodes D5 and D9 and one end of a resistor R43, the source electrode of the MOS tube Q9 is connected with the positive electrode end of the lithium battery pack and is connected with the negative electrode of the diode D6 through a diode D8, the grid electrode of the MOS tube Q9 is connected with the anode of a diode D9, the other end of a resistor R43 and one end of a resistor R45 through a resistor R41, the other end of the resistor R45 is connected with the collector electrode of a triode Q11, the base electrode of the triode Q11 is connected with one ends of the resistors R49 and R51, the other end of the resistor R49 is connected with the output end P10 of the controller, and the emitter electrode of the triode Q.
6. The motor-driven battery pack management system according to claim 1, wherein: the charge and discharge detection circuit comprises a triode Q10, the collector of the triode Q10 is connected with the input end AN1 of the controller through a resistor R42, the base of the triode Q10 is connected with one end of resistors R21 and R40, the other end of the resistor R21 is connected with the positive end of the power interface of the adapter through a voltage-regulator tube DZ1, and the emitter of the triode Q10 and the other end of the resistor R40 are grounded.
7. The motor-driven battery pack management system according to claim 1, wherein: the over-temperature detection circuit comprises a thermistor NTC arranged in the lithium battery pack, a power supply end of the thermistor NTC is connected with a +5V power supply port, and an output end of the thermistor NTC is connected with input ends of the controller U4 and the analog switch chip U5.
8. The motor-driven battery pack management system according to claim 1, wherein: the current detection control circuit comprises an MOS tube Q12 connected with the battery power supply port M-, the grid of an MOS tube Q12 is connected with the output end P9 of a controller U4 through a resistor R53, the source of the MOS tube Q12 is grounded through a resistor C32, a resistor R57 and a resistor R58 which are connected in parallel, the source of the MOS tube Q12 is connected with the base of a triode Q13 through a resistor R56, the pin 17 of the controller U4, one end of a resistor R55 and one end of a capacitor C31, the collector of the triode Q13 is connected with one end of the capacitor C29 and the pin 19 of the controller U4 through the resistor R52, and the emitter of the triode Q13 is connected with the other ends of the resistor R55, the capacitors C31 and the.
9. The motor-driven battery pack management system according to claim 1, wherein: the voltage detection control circuit comprises a plurality of detection branch circuits with the same structure, each detection branch circuit comprises an MOS (metal oxide semiconductor) tube Qj, the grid electrode of each MOS tube Qj is connected with a pin 2 of a controller U4 through a resistor R54, the drain electrode of each MOS tube Qj is connected with the anode of only one lithium battery which is different from each other through a resistor Rn, the source electrode of each MOS tube Qj is grounded through a resistor Rm, one end of a capacitor Cq and the input end of an analog switch chip are connected through a resistor Rp, and the other end of the capacitor Cq is grounded.
10. A motor-driven battery pack management system according to any one of claims 1 to 9, wherein: the electric quantity indicating circuit comprises indicating lamps L3, L4, L5 and L6, the anodes of the indicating lamps L3, L4, L5 and L6 are connected with the output end of the controller through resistors R36, R37, R38 and R39 respectively, and the cathodes of the indicating lamps L3, L4, L5 and L6 are grounded.
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| CN201911206795.0A CN110768346A (en) | 2019-11-29 | 2019-11-29 | Motor-driven battery pack management system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112398095A (en) * | 2020-12-02 | 2021-02-23 | 福州物联网开放实验室有限公司 | Constant-current charging protection circuit |
| CN112769207A (en) * | 2020-12-24 | 2021-05-07 | 福建众益太阳能科技股份公司 | Solar street lamp aging test lithium battery capacity electric energy recovery system |
| CN115172912A (en) * | 2022-09-07 | 2022-10-11 | 禹创半导体(深圳)有限公司 | Method for prolonging standby time of battery by battery protection chip |
| CN116388570A (en) * | 2023-06-07 | 2023-07-04 | 盈力半导体(上海)有限公司 | Buck circuit chip |
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2019
- 2019-11-29 CN CN201911206795.0A patent/CN110768346A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112398095A (en) * | 2020-12-02 | 2021-02-23 | 福州物联网开放实验室有限公司 | Constant-current charging protection circuit |
| CN112769207A (en) * | 2020-12-24 | 2021-05-07 | 福建众益太阳能科技股份公司 | Solar street lamp aging test lithium battery capacity electric energy recovery system |
| CN112769207B (en) * | 2020-12-24 | 2023-09-22 | 福建众益太阳能科技股份公司 | Solar street lamp aging test lithium battery capacity electric energy recovery system |
| CN115172912A (en) * | 2022-09-07 | 2022-10-11 | 禹创半导体(深圳)有限公司 | Method for prolonging standby time of battery by battery protection chip |
| CN116388570A (en) * | 2023-06-07 | 2023-07-04 | 盈力半导体(上海)有限公司 | Buck circuit chip |
| CN116388570B (en) * | 2023-06-07 | 2023-08-04 | 盈力半导体(上海)有限公司 | Buck circuit chip |
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