CN113541251B - Master-slave household battery management system and starting method - Google Patents
Master-slave household battery management system and starting method Download PDFInfo
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- CN113541251B CN113541251B CN202110798026.5A CN202110798026A CN113541251B CN 113541251 B CN113541251 B CN 113541251B CN 202110798026 A CN202110798026 A CN 202110798026A CN 113541251 B CN113541251 B CN 113541251B
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- 238000001514 detection method Methods 0.000 claims abstract description 54
- 238000006243 chemical reaction Methods 0.000 claims description 31
- 101100134058 Caenorhabditis elegans nth-1 gene Proteins 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000002457 bidirectional effect Effects 0.000 abstract description 5
- 238000004146 energy storage Methods 0.000 abstract description 5
- 238000002955 isolation Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 4
- 241001672018 Cercomela melanura Species 0.000 description 3
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- 230000005540 biological transmission Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
Classifications
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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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- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- H02J9/062—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 AC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to a master-slave household battery management system and a starting method. The system comprises a main control unit and a plurality of slave control units connected with the main control unit; the method is characterized in that: the power supply unit is used for adjusting the voltage; the main control unit comprises a main control chip and an internal power supply module; the alternating current power supply and the battery pack are input to the voltage input end of the main control unit through the power supply unit; the alternating current power supply and the battery pack also respectively output detection signals to a first detection signal input end and a second detection signal input end; the first starting signal input end is connected with a starting signal end of the inverter; the second start signal input end is connected with the switching element. The system of the invention supplies power in a diversified way, supports the wake-up starting of an external bidirectional energy storage inverter and supports off-grid application.
Description
Technical Field
The invention relates to the technical field of battery management, in particular to a master-slave household battery management system and a starting method.
Background
Fig. 1 is a schematic diagram of a high-voltage lithium ion battery management system in the prior art, and as shown in fig. 1, the battery management system is composed of a master control unit, a plurality of slave control units and an AC/DC module. The master control unit is in communication connection with the first slave control unit through a network line S1, the first slave control unit is in communication connection with the second slave control unit through a network line S2, and the N-1 th slave control unit is in communication connection with the N-th slave control unit through a network line SN. Meanwhile, the master control unit is connected with the first slave control unit through a power line D1, the first slave control unit is connected with the second slave control unit through the power line D1, and the N-1 slave control unit is connected with the N slave control unit through a power line DN. The AC/DC module supplies power to the master control unit and the plurality of slave control units. After the connection of the master control unit and the slave control units is completed, the AC/DC module powers on the master control unit and the slave control units to work.
The disadvantages of the prior art are mainly represented by:
1. The power supply is single, and an alternating current power supply is needed for supplying power. If there is no ac power, the system cannot be started.
2. When the system is formed by the bidirectional energy storage inverter (PCS, power Conversion System), the bidirectional energy storage inverter cannot start to wake up the battery management system.
3. Because the grid cannot be started without the ac power supply, the system cannot be adapted for off-grid applications.
Disclosure of Invention
Aiming at the defects of the prior art, the invention discloses a master-slave household battery management system and a starting method.
The technical scheme adopted by the invention is as follows:
A master-slave household battery management system comprises a master control unit and a plurality of slave control units connected with the master control unit; the method is characterized in that: the power supply unit is used for adjusting the voltage;
The main control unit comprises a main control chip and an internal power supply module; the main control unit further comprises a first detection signal input end, a second detection signal input end, a first starting signal input end and a second starting signal input end which are connected with the main control chip; the main control unit also comprises a voltage input end connected to the internal power supply module; the alternating current power supply and the battery pack are input to the voltage input end of the main control unit through the power supply unit; the alternating current power supply and the battery pack also respectively output detection signals to a first detection signal input end and a second detection signal input end; the first starting signal input end is connected with a starting signal end of the inverter; the second start signal input end is connected with the switching element.
The power supply unit comprises a rectifying device, a direct current conversion device and a diode group; the battery terminal total positive electrode and the battery terminal total negative electrode of the battery pack are connected to the input end of the direct current conversion device; the output end of the direct current conversion device is connected to the anode end of the diode group; the alternating current power supply is connected to the input end of the rectifying device, and the output end of the rectifying device is connected to the anode end of the diode group; the cathode end of the diode group is connected to the voltage input end of the main control unit.
The further technical scheme is that the diode group comprises a first diode, a second diode and a third diode; the output end of the rectifying device is connected to the anode of the first diode; the output end of the direct current conversion device is connected to the anode of the second diode; the cathode of the first diode and the cathode of the second diode are both connected with the anode of the third diode; the cathode of the third diode is connected with the voltage input end of the control unit.
The further technical proposal is that the output end of the rectifying device is connected to the input end of the first detection signal; the output end of the direct current conversion device is connected to the second detection signal input end.
The further technical proposal is that the number of the slave control units is N; the slave control unit comprises a first network connection end and a second network connection end; the main control unit comprises a main network connection end; the first network connection end of the 1 st slave control unit is connected to the main network connection end through a network line; the first network connection end of the nth slave control unit is connected to the second network connection end of the nth-1 slave control unit through a network line; n is more than or equal to N is more than or equal to 2, and N and N are natural numbers.
The further technical proposal is that the number of the slave control units is N; the slave control unit comprises a first power supply end and a second power supply end; the main control unit comprises a main control power supply end; the first power end of the 1 st slave control unit is connected with the main control power end through a power line; the first power end of the nth slave control unit is connected to the second power end of the nth-1 slave control unit through a power line; n is more than or equal to N is more than or equal to 2, and N and N are natural numbers.
The further technical scheme is that the first detection signal input end, the second detection signal input end, the first starting signal input end and the second starting signal input end are all connected to a general input/output pin of the main control chip through an isolation optocoupler.
A starting method based on the master-slave household battery management system as claimed in any one of the above, wherein the starting method is a black starting method, and comprises the following steps:
Step 1, a master control unit and a slave control unit are connected, a battery end total positive electrode of a battery management system is connected to a positive electrode input end of a direct current conversion device, and a battery end total negative electrode is connected to a negative electrode input end of the direct current conversion device.
Step 2, the direct current conversion device works, and outputs working voltage to the voltage input end of the main control unit, and meanwhile, outputs detection voltage data to the second detection signal input end of the main control unit.
Step 3, the main control unit is powered on to work; and closing the switching element, detecting detected voltage data and a switching element closing signal by the main control unit, monitoring that all slave control unit data are normal, driving the main loop connecting device to work, and enabling the inverter to work electrically.
A method for starting up a battery management system for a master-slave consumer, based on any one of the above claims, the method for starting up the battery management system by an inverter, comprising the steps of:
Step 1, connecting a master control unit and a slave control unit, and inputting an alternating current power supply to the input end of a rectifying device;
And 2, the rectifying device works, and outputs working voltage to the voltage input end of the main control unit, and meanwhile, outputs detection voltage data to the first detection signal input end of the main control unit.
Step 3, the main control unit is powered on to work; the inverter outputs a starting signal; the main control unit detects the detection voltage data and the starting signal simultaneously, monitors all the data of the slave control units to be normal simultaneously, drives the main loop connecting device to work, and completes the process of starting the battery management system through the inverter.
The beneficial effects of the invention are as follows:
1. The battery management system in the invention supplies power in a diversified way, and can supply power by using an alternating current power supply or by using a battery pack. The system supports black start, when the whole system is shut down due to fault, the alternating current power supply end of the system is powered off, and the system can be started by the battery pack with self-starting capability in the system without depending on other network assistance
2. The invention supports the wake-up starting of the external bidirectional energy storage inverter, and the main control unit detects the power supply of the alternating current power supply and the starting signal of the bidirectional energy storage inverter, so that the starting of the battery management system can be completed.
3. Off-network applications are supported. The battery management system can be normally applied under the condition of no alternating current power grid due to the black start function.
Drawings
Fig. 1 is a schematic diagram of a prior art system.
Fig. 2 is a schematic diagram of a system structure according to an embodiment of the present invention.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
Fig. 2 is a schematic diagram of a system structure according to an embodiment of the present invention.
As shown in fig. 2, the master-slave type household battery management system comprises a master control unit U3 and a plurality of slave control units connected to the master control unit U3. The main circuit connection device U5, the power supply unit, the inverter U4, and the switching element S are also included.
The main control unit U3 comprises a main control chip MCU and an internal power supply module DC. The main control chip MCU is used for controlling the transmission of data. The internal power supply module DC is used to control the transmission of power.
The main control unit U3 includes a plurality of external connection ports. The external connection ports comprise a first detection signal input end, a second detection signal input end, a first starting signal input end and a second starting signal input end which are connected to the MCU of the main control chip, and a voltage input end which is connected to the DC of the internal power supply module.
The alternating current power supply and the battery pack are input to the voltage input end of the main control unit U3 through the power supply unit, and can transmit power to the slave control unit through the internal power supply module DC. The alternating current power supply and the battery pack also respectively output detection signals to the first detection signal input end and the second detection signal input end. The first start signal input end is connected with the start signal end of the inverter U4. The second start signal input is connected in series with the switching element S. The first end of the switching element S is connected with the second starting signal input end, and the second end of the switching element S is connected with a power supply.
Further, the power supply unit includes a rectifying device U1, a dc conversion device U2, and a diode group. The total positive pole and the total negative pole of the battery pack are respectively connected to the positive pole input end and the negative pole input end of the direct current conversion device U2. The output terminal of the direct current conversion device U2 is connected to the anode terminal of the diode group. The alternating current power supply is connected to the input end of the rectifying device U1, and the output end of the rectifying device U1 is connected to the anode end of the diode group. The cathode end of the diode group is connected to the voltage input end of the main control unit U3. The output end of the rectifying device U1 is also connected to the first detection signal input end. The output end of the direct current conversion device U2 is also connected to the second detection signal input end. In this embodiment, the rectifying device U1 may input an alternating voltage of 85 to 275V, and the dc converting device U2 may input a direct voltage of 85 to 600V.
The diode group is formed by connecting a plurality of diodes in series or in parallel, and when the plurality of diodes are connected in series or in parallel, the directions of the anode and the cathode are consistent. In the embodiment shown in fig. 2, the diode group includes a first diode D1, a second diode D2, and a third diode D3. The output of the rectifying means U1 is connected to the anode of the first diode D1. The output of the dc conversion device U2 is connected to the anode of the second diode D2. The cathode of the first diode D1 and the cathode of the second diode D2 are both connected to the anode of the third diode D3. The cathode of the third diode D3 is connected to the voltage input terminal of the control unit U3. The diode group is used for controlling the direction of the current.
As shown in fig. 2, the slave control unit is connected with the master control unit U3 through a network connection line and a power line. The network connection line is used for transmitting network data, and the power line is used for transmitting power.
The number of slave control units is N. The slave control unit comprises a first network connection end and a second network connection end. The main control unit comprises a main network connection end. The network connection end is used for transmitting related data.
The first network connection end of the 1 st slave control unit is connected to the master network connection end through the 1 st network line S1. The first network connection end of the nth slave control unit is connected to the second network connection end of the nth-1 slave control unit through the Sn-th network line. N is more than or equal to N is more than or equal to 2, and N and N are natural numbers.
The slave control unit comprises a first power supply end and a second power supply end. The main control unit comprises a main control power supply end. The first power end of the 1 st slave control unit is connected with the main control power end through the 1 st power line d 1. The first power end of the nth slave control unit is connected to the second power end of the nth-1 slave control unit through an nth power line dn. N is more than or equal to N is more than or equal to 2, and N and N are natural numbers.
The first detection signal input end, the second detection signal input end, the first starting signal input end and the second starting signal input end are all connected to the main control chip MCU through the isolation optocoupler. Specifically, the main control unit U3 includes a first isolation optocoupler P1, a second isolation optocoupler P2, a third isolation optocoupler P3, and a fourth isolation optocoupler P4. The output end of the rectifying device U1 is connected to the input end of the first isolation optocoupler P1 through the first detection signal input end, and the output end of the first isolation optocoupler P1 is connected to the main control chip MCU. The output end of the direct current conversion device U2 is connected to the input end of the second isolation optocoupler P2 through the second detection signal input end, and the output end of the second isolation optocoupler P2 is connected to the main control chip MCU. The starting signal end of the inverter U4 is connected to the input of the third isolation optocoupler P3 through the first starting signal input end, and the output end of the third isolation optocoupler P3 is connected to the main control chip MCU. The switch element S is connected in series with the input end of the fourth isolation optocoupler P4, and the output end of the fourth isolation optocoupler P4 is connected to the main control chip MCU. Specifically, each element can be connected to a general input/output pin of the main control chip MCU for transmitting related high/low level signals.
The inverter U4 comprises an inverter input end, an inverter output end and a starting signal end, wherein the inverter input end is connected with an alternating current power supply, and the inverter output end is connected to the input end of the main loop connecting device U5. The main circuit connection U5 is also connected to the input of the dc conversion device U2. The main loop connection device U5 and the main control unit U3 are also connected with each other to transmit control signals. The working methods of the inverter U4 and the main loop connection device U5 are the prior art, and are not described in detail.
The invention also discloses a starting method based on the master-slave household battery management system.
When the starting method is a black starting method, the method comprises the following steps:
Step 1, a master control unit U3 and a slave control unit are connected, a total positive electrode of a battery end of the battery management system is connected to a positive electrode input end of a direct current conversion device U2, and a total negative electrode of the battery end is connected to a negative electrode input end of the direct current conversion device U2.
Step 2, the direct current conversion device U2 works, outputs a working voltage to a voltage input end of the main control unit U3, and simultaneously outputs detection voltage data dc_det to a second detection signal input end of the main control unit U3.
Step 3, the main control unit U3 may output a control signal to the main loop connection device U5. The main control unit U3 is powered on. The switch S1 is closed, the main control unit U3 detects the detection voltage data DC_DET and the switch closing signal at the same time, and monitors that all the slave control unit data are normal, and the main control unit U3 drives the main loop connecting device U5 to work, so that the inverter (U4) is electrified to work, the whole system works, and the black start of the battery management system is completed.
When the starting method is a method for starting the battery management system driven by the inverter U4, the method comprises the following steps:
step 1, a master control unit U3 and a slave control unit are connected, and an alternating current power supply is input to the input end of a rectifying device U1.
Step 2, the rectifying device U1 works, outputs a working voltage to the voltage input end of the main control unit U3, and simultaneously outputs the detection voltage data ac_det to the first detection signal input end of the main control unit U3.
And step 3, the main control unit U3 is powered on to work. Inverter U4 outputs a Start signal pc_start. The main control unit U3 detects the detection voltage data AC_DET and the starting signal PC_Start at the same time, monitors that all the slave control unit data are normal at the same time, and the main control unit U3 drives the main loop connecting device U5 to work, so that the whole system works, and the process of driving the battery management system to Start by the inverter U4 is completed.
The above description is illustrative of the invention and not limiting, the scope of the invention being defined by the appended claims, which may be modified in any manner without departing from the basic structure of the invention.
Claims (6)
1. A master-slave household battery management system comprises a master control unit (U3) and a plurality of slave control units connected with the master control unit (U3); the method is characterized in that: the power supply unit further comprises an inverter (U4), a switching element (S) and a power supply unit for adjusting the voltage;
The main control unit (U3) comprises a main control chip (MCU) and an internal power supply module (DC); the main control unit (U3) further comprises a first detection signal input end, a second detection signal input end, a first starting signal input end and a second starting signal input end which are connected with the main control chip (MCU); the main control unit (U3) further comprises a voltage input end connected to the internal power supply module (DC); the alternating current power supply and the battery pack are input to the voltage input end of the main control unit (U3) through the power supply unit; the alternating current power supply and the battery pack also respectively output detection signals to a first detection signal input end and a second detection signal input end; the first starting signal input end is connected with a starting signal end of the inverter (U4); the second starting signal input end is connected with the switching element (S);
The power supply unit comprises a rectifying device (U1), a direct current conversion device (U2) and a diode group; the battery terminal total positive electrode and the battery terminal total negative electrode of the battery pack are connected to the input end of the direct current conversion device (U2); the output end of the direct current conversion device (U2) is connected to the anode end of the diode group; the alternating current power supply is connected to the input end of the rectifying device (U1), and the output end of the rectifying device (U1) is connected to the anode end of the diode group; the cathode end of the diode group is connected to the voltage input end of the main control unit (U3);
The diode group comprises a first diode (D1), a second diode (D2) and a third diode (D3); the output end of the rectifying device (U1) is connected to the anode of the first diode (D1); the output end of the direct current conversion device (U2) is connected to the anode of the second diode (D2); the cathode of the first diode (D1) and the cathode of the second diode (D2) are connected with the anode of the third diode (D3); the cathode of the third diode (D3) is connected with the voltage input end of the control unit (U3);
The starting method of the master-slave household battery management system is a black starting method and comprises the following steps:
Step 1, a main control unit (U3) and a slave control unit are connected, a total positive electrode of a battery end of a battery management system is connected to a positive electrode input end of a direct current conversion device (U2), and a total negative electrode of the battery end is connected to a negative electrode input end of the direct current conversion device (U2);
step 2, the direct current conversion device (U2) works, outputs working voltage to the voltage input end of the main control unit (U3), and simultaneously outputs detection voltage data to the second detection signal input end of the main control unit (U3);
Step 3, the main control unit (U3) is powered on to work; and closing the switching element (S), simultaneously detecting the detection voltage data and the closing signal of the switching element (S) by the main control unit (U3), simultaneously monitoring that all the data of the slave control units are normal, driving the main loop connecting device (U5) to work, and enabling the inverter (U4) to work electrically.
2. A master-slave household battery management system comprises a master control unit (U3) and a plurality of slave control units connected with the master control unit (U3); the method is characterized in that: the power supply unit further comprises an inverter (U4), a switching element (S) and a power supply unit for adjusting the voltage;
The main control unit (U3) comprises a main control chip (MCU) and an internal power supply module (DC); the main control unit (U3) further comprises a first detection signal input end, a second detection signal input end, a first starting signal input end and a second starting signal input end which are connected with the main control chip (MCU); the main control unit (U3) further comprises a voltage input end connected to the internal power supply module (DC); the alternating current power supply and the battery pack are input to the voltage input end of the main control unit (U3) through the power supply unit; the alternating current power supply and the battery pack also respectively output detection signals to a first detection signal input end and a second detection signal input end; the first starting signal input end is connected with a starting signal end of the inverter (U4); the second starting signal input end is connected with the switching element (S);
The power supply unit comprises a rectifying device (U1), a direct current conversion device (U2) and a diode group; the battery terminal total positive electrode and the battery terminal total negative electrode of the battery pack are connected to the input end of the direct current conversion device (U2); the output end of the direct current conversion device (U2) is connected to the anode end of the diode group; the alternating current power supply is connected to the input end of the rectifying device (U1), and the output end of the rectifying device (U1) is connected to the anode end of the diode group; the cathode end of the diode group is connected to the voltage input end of the main control unit (U3);
The diode group comprises a first diode (D1), a second diode (D2) and a third diode (D3); the output end of the rectifying device (U1) is connected to the anode of the first diode (D1); the output end of the direct current conversion device (U2) is connected to the anode of the second diode (D2); the cathode of the first diode (D1) and the cathode of the second diode (D2) are connected with the anode of the third diode (D3); the cathode of the third diode (D3) is connected with the voltage input end of the control unit (U3);
the starting method of the master-slave household battery management system is a method for starting the battery management system through an inverter (U4), and comprises the following steps of:
Step 1, a main control unit (U3) and a slave control unit are connected, and an alternating current power supply is input to the input end of a rectifying device (U1);
Step 2, the rectifying device (U1) works, outputs working voltage to the voltage input end of the main control unit (U3), and simultaneously outputs detection voltage data to the first detection signal input end of the main control unit (U3);
Step3, the main control unit (U3) is powered on to work; the inverter (U4) outputs a start signal; the main control unit (U3) detects the detection voltage data and the starting signal at the same time, monitors all the data of the slave control units to be normal at the same time, drives the main loop connecting device (U5) to work, and completes the process of starting the battery management system driven by the inverter (U4).
3. Master-slave household battery management system according to claim 1 or 2, characterized in that the output of the rectifying means (U1) is connected to the first detection signal input; the output end of the direct current conversion device (U2) is connected to the second detection signal input end.
4. The master-slave household battery management system according to claim 1 or 2, wherein the number of slave control units is N; the slave control unit comprises a first network connection end and a second network connection end; the main control unit comprises a main network connection end; the first network connection end of the 1 st slave control unit is connected to the main network connection end through a network line; the first network connection end of the nth slave control unit is connected to the second network connection end of the nth-1 slave control unit through a network line; n is more than or equal to N is more than or equal to 2, and N and N are natural numbers.
5. The master-slave household battery management system according to claim 1 or 2, wherein the number of slave control units is N; the slave control unit comprises a first power supply end and a second power supply end; the main control unit comprises a main control power supply end; the first power end of the 1 st slave control unit is connected with the main control power end through a power line; the first power end of the nth slave control unit is connected to the second power end of the nth-1 slave control unit through a power line; n is more than or equal to N is more than or equal to 2, and N and N are natural numbers.
6. The master-slave consumer battery management system of claim 1 or 2, wherein the first detection signal input, the second detection signal input, the first start signal input and the second start signal input are all connected to a universal input output pin of a master control chip (MCU) through an isolated optocoupler.
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