CN111030244A - Household energy storage inverter and lithium battery parallel operation system - Google Patents
Household energy storage inverter and lithium battery parallel operation system Download PDFInfo
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- CN111030244A CN111030244A CN201911385282.0A CN201911385282A CN111030244A CN 111030244 A CN111030244 A CN 111030244A CN 201911385282 A CN201911385282 A CN 201911385282A CN 111030244 A CN111030244 A CN 111030244A
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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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
- 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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- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a parallel operation system of a household energy storage inverter and a lithium battery, which comprises an inverter integrated circuit, a main lithium battery pack circuit and a plurality of auxiliary lithium battery pack circuits, wherein the main lithium battery pack circuit is in communication connection with the inverter integrated circuit through a Controller Area Network (CAN), and the main lithium battery pack circuit is in communication connection with the auxiliary lithium battery pack circuits through an RS 485; the main lithium battery pack circuit acquires and collects state information of each lithium battery pack through an RS485 interface, the state information and the state information of the lithium battery packs in the main lithium battery pack circuit are fed back to the inverter all-in-one machine circuit through the CAN communication interface, and the inverter all-in-one machine circuit adjusts charging and discharging power of the lithium battery packs according to the state information. According to the invention, the state information of the lithium batteries in each slave lithium battery pack circuit is obtained through the master lithium battery pack circuit and fed back to the inverter all-in-one machine, so that the inverter all-in-one machine can control the charging and discharging conditions of each lithium battery according to the state information of each lithium battery pack.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a parallel operation system of a household energy storage inverter and a lithium battery.
Background
In household electricity, a lithium battery is required as a standby power supply to supply power to household electrical equipment uninterruptedly. Therefore, the lithium battery pack needs to be charged in time and the state of the lithium battery needs to be known in real time so as to ensure that the lithium battery can normally supply power. At present, a plurality of lithium battery packs are mainly monitored through an inverter all-in-one machine, battery data are mainly read one by one through RS485 between the inverter and the lithium battery packs, and the mode results in the fact that the inverter is integrated and the obtained data volume is large, and the inverter is not easy to process. The inverter all-in-one machine and the lithium battery pack belong to different manufacturers, and the inverter all-in-one machine manufacturer does not know the functions of the lithium battery pack produced by the lithium battery pack manufacturer, so that the inverter all-in-one machine is not easy to gather when gathering the state information of all the lithium battery packs, and the inverter all-in-one machine is very troublesome to process.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a parallel operation system of a household energy storage inverter and a lithium battery.
In order to achieve the purpose, the invention provides a parallel operation system of a household energy storage inverter and a lithium battery, which comprises an inverter integrated circuit, a main lithium battery pack circuit and a plurality of auxiliary lithium battery pack circuits, wherein the main lithium battery pack circuit is in communication connection with the inverter integrated circuit through a CAN (controller area network), and the main lithium battery pack circuit is in communication connection with the auxiliary lithium battery pack circuits through RS 485; the main lithium battery pack circuit acquires and collects state information of the lithium battery pack in the slave lithium battery pack circuit through an RS485 interface, the state information and the state information of the lithium battery pack in the main lithium battery pack circuit are fed back to the inverter all-in-one circuit through the CAN communication interface, and the inverter all-in-one circuit adjusts charging and discharging power of the main lithium battery pack circuit and the lithium battery pack in the slave lithium battery pack according to the state information.
Furthermore, the circuit structure of the main lithium battery pack circuit is the same as that of the slave lithium battery pack circuit, and the main lithium battery pack circuit and the slave lithium battery pack circuit comprise a lithium battery pack and a battery management system BMS, wherein the battery management system BMS comprises a dial switch, a discharge MOS (metal oxide semiconductor) tube, a charge MOS tube, a pre-charge resistor, a detection resistor, an MCU (microprogrammed control unit) controller for controlling the charging of the lithium battery and an AFE (automatic back-up) module for acquiring the state information of the lithium battery pack, and the MCU controller, the AFE module and; the positive output P + of the inverter all-in-one circuit is respectively connected with the battery management system BMS and the lithium battery pack circuit, the positive output P-of the inverter all-in-one circuit is connected with the source electrode circuit of the charging MOS tube, the drain electrode of the charging MOS tube is connected with the drain electrode circuit of the discharging MOS tube, the source electrode of the discharging MOS tube is connected with the detection resistor circuit, and the detection circuit is connected with the negative electrode circuit of the lithium battery pack; one end of the pre-charging resistor is connected with a source electrode circuit of the charging MOS tube, the other end of the pre-charging resistor is connected with a drain electrode circuit of the pre-charging MOS tube, and a source electrode of the pre-charging MOS tube is connected with a source electrode circuit of the discharging MOS tube; the gate of the pre-charging MOS tube is connected with an MCU controller circuit through a switch Kn1, the gate of the discharging MOS tube is connected with the MCU controller circuit through a switch Kn2, the gate of the discharging MOS tube is connected with the MCU controller circuit through a switch Kn3, and the switch Kn1, the switch Kn2 and the switch Kn3 are controlled through the MCU controller; and the dial switch is in circuit connection with the MCU controller.
Furthermore, the main lithium battery pack circuit further comprises a wake-up switch connected with the MCU controller circuit and used for manually starting to charge or discharge the lithium battery.
Furthermore, the inverter all-in-one machine circuit comprises a filter, a rectifier, an inverter and a static switch, wherein the input end of the filter is connected with a mains supply input interface circuit of the inverter all-in-one machine circuit, the output end of the filter is connected with the input end circuit of the rectifier after being connected with an input switch Su3 circuit, the output end of the rectifier is connected with the input end circuit of the inverter, and the output end of the inverter is connected with an output switch Su6 circuit after being connected with a static switch Su5 circuit; the output end of the filter is connected with a bypass switch Su2 circuit and then is connected with one end circuit of an electrostatic switch Su4, the other end of the electrostatic switch Su4 is connected with a circuit of a connection midpoint a of an output switch Su6 and a static switch Su5, and the output switch Su6 is connected with a circuit load output end of the inverter all-in-one machine circuit; a maintenance switch Su1 is connected in series between the output end of the filter and the load output end of the inverter all-in-one machine circuit; the connection midpoint b of the rectifier and the inverter is connected with the battery input interface circuit; during charging, mains supply is input through the input end of the inverter all-in-one machine, is filtered by the filter and then is rectified and output to the battery input end through the rectifier bridge to charge the lithium battery pack; during discharging, the lithium battery is input to a battery input interface of the inverter all-in-one machine through a battery input end, and then direct current is converted into alternating current through the inverter and then output to supply power for a load.
Further, the inverter integrated circuit further comprises a photovoltaic controller and a photovoltaic input interface, the photovoltaic input interface is connected with the photovoltaic control circuit through an input switch Su7, and the output end of the photovoltaic controller is connected with the connection midpoint b in a circuit manner; photovoltaic electric energy is accessed through a photovoltaic input interface, processed and rectified by a photovoltaic controller and then output to a battery input end to charge a lithium battery.
Further, when the inverter all-in-one machine charges the lithium battery pack, the MCU controller firstly controls Kn3 to be disconnected when the lithium battery has over-temperature, over-current and over-voltage faults, and the MCU controller closes Kn3 to be closed after preset conditions are recovered so as to charge and protect the lithium battery pack.
Further, when the inverter all-in-one machine discharges the lithium battery pack, the MCU controller firstly controls Kn2 to be disconnected when the lithium battery has over-temperature, over-current and under-voltage faults, and the MCU controller closes Kn2 to be closed after the preset condition is recovered so as to perform discharge protection on the lithium battery pack.
Compared with the prior art, the invention has the following advantages: according to the invention, the lithium battery pack module is divided into the main lithium battery pack circuit and the auxiliary lithium battery pack circuits, wherein the main lithium battery pack circuit is communicated with the plurality of auxiliary lithium battery pack circuits through RS485 so as to collect the state information of all lithium battery packs through the main lithium battery pack circuit, and then the main lithium battery pack circuit is communicated with the inverter all-in-one machine through CAN, so that the state information of all lithium battery packs is collected into the inverter all-in-one machine, and the inverter all-in-one machine is convenient to control the charging and discharging conditions of each lithium battery according to the state information of each lithium battery pack. According to the invention, the main lithium battery pack circuit and the slave lithium battery pack circuit are arranged through the dial switch, so that the main lithium battery pack circuit collects the state information of all lithium battery packs, and then the collected state information is directly fed back to the inverter all-in-one machine, and the processing pressure of the inverter all-in-one machine is reduced, so that the inverter all-in-one machine is applicable to inverters of any manufacturer, and the requirements on the inverter all-in-one machine are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic circuit structure diagram of an embodiment of a parallel operation system of a household energy storage inverter and a lithium battery according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the invention provides a parallel operation system of a household energy storage inverter and a lithium battery, which comprises an inverter integrated circuit, a main lithium battery pack circuit and a plurality of auxiliary lithium battery pack circuits, wherein the main lithium battery pack circuit is in communication connection with the inverter integrated circuit through a Controller Area Network (CAN), and the main lithium battery pack circuit is in communication connection with the auxiliary lithium battery pack circuits through a Relay Station (RS) 485; the main lithium battery pack circuit acquires and collects state information of the lithium battery pack in the slave lithium battery pack circuit through an RS485 interface, the state information and the state information of the lithium battery pack in the main lithium battery pack circuit are fed back to the inverter all-in-one circuit through the CAN communication interface, and the inverter all-in-one circuit adjusts charging and discharging power of the main lithium battery pack circuit and the lithium battery pack in the slave lithium battery pack according to the state information.
Wherein, as shown in fig. 1, the circuit structure of the main lithium battery group circuit is the same as that of the slave lithium battery group circuit, the main lithium battery group circuit and the slave lithium battery group circuit are both provided with dial switches, and the switch address of the dial switch is set, so that one of the lithium battery group circuits is set as the main lithium battery group circuit, and the other lithium battery group circuits are the slave lithium battery group circuits. For example, as shown in fig. 1, the dial switch address of the lithium battery pack N is 00000, the master (master lithium battery pack circuit) is set, the dial switch addresses of the other lithium battery packs are 11000-11111, and the slave (slave lithium battery pack circuit) is set, after the setting, the master CAN acquire the voltage, temperature, current and other information of the slave battery one by one through the RS485 interface, and after the summary, the master feeds back the data to the inverter all-in-one machine through the CAN interface. In the embodiment of the invention, the task of summarizing the lithium battery state information is completed through the main lithium battery pack circuit, so that the requirement on the inverter all-in-one machine is reduced, and the inverter all-in-one machine can be combined with the inverter all-in-one machine generated by any other manufacturer for supplying power to household electric equipment uninterruptedly. According to the invention, the inverter all-in-one machine only needs to control the charging power and the discharging power of the lithium battery pack according to the information fed back by the main lithium battery pack circuit, so that the processing pressure of the inverter all-in-one machine is greatly reduced.
Specifically, the main lithium battery pack circuit comprises a lithium battery pack and a battery management system BMS, wherein the battery management system BMS comprises a dial switch, a discharge MOS (metal oxide semiconductor) tube, a charge MOS tube, a pre-charge resistor, a detection resistor, an MCU (micro control unit) controller for controlling the charging of the lithium battery and an AFE (automatic back-up) module for acquiring the state information of the lithium battery pack, and the MCU controller, the AFE module and the lithium battery pack are in circuit connection; the positive output P + of the inverter all-in-one circuit is respectively connected with the battery management system BMS and the lithium battery pack circuit, the positive output P-of the inverter all-in-one circuit is connected with the source electrode circuit of the charging MOS tube, the drain electrode of the charging MOS tube is connected with the drain electrode circuit of the discharging MOS tube, the source electrode of the discharging MOS tube is connected with the detection resistor circuit, and the detection circuit is connected with the negative electrode circuit of the lithium battery pack; one end of the pre-charging resistor is connected with a source electrode circuit of the charging MOS tube, the other end of the pre-charging resistor is connected with a drain electrode circuit of the pre-charging MOS tube, and a source electrode of the pre-charging MOS tube is connected with a source electrode circuit of the discharging MOS tube; the gate of the pre-charging MOS tube is connected with an MCU controller circuit through a switch Kn1, the gate of the discharging MOS tube is connected with the MCU controller circuit through a switch Kn2, the gate of the discharging MOS tube is connected with the MCU controller circuit through a switch Kn3, and the switch Kn1, the switch Kn2 and the switch Kn3 are controlled through the MCU controller; and the dial switch is in circuit connection with the MCU controller.
The lithium battery pack state information comprises voltage, current, temperature, fault conditions and the like. In the main lithium battery pack circuit, the current flowing through the lithium battery pack is determined according to the voltage difference and the resistance value of the check resistor and is fed back to the AFE module; in addition, the lithium battery pack circuit is also provided with an NTC thermistor for measuring the temperature of the lithium battery pack and feeding back the temperature to the AFE module. The AFE module is also used for collecting the voltage value of the lithium battery pack. The AFE module sends the collected state information of the lithium battery pack to the MCU controller, and the state information of the lithium battery pack is fed back to the inverter all-in-one machine through the MCU controller.
Since the circuit structure of the slave lithium battery is the same as that of the master lithium battery, detailed description is omitted here, and specific reference may be made to fig. 1. From the lithium battery circuit, the AFE module sends the collected state information of the lithium battery pack to the MCU, and the state information of the lithium battery pack is fed back to the main lithium battery circuit through the MCU controller.
When the charging mode is started, the inverter integrated circuit outputs voltage through a P + P-output interface to respectively charge lithium batteries in the main lithium battery pack circuit and the slave lithium battery pack circuit, a battery management system BMS in the main lithium battery pack circuit and the slave lithium battery pack circuit is electrified for self-detection, if the self-detection is unsuccessful, a fault is reported, fault information is fed back to an AFE module, and the main lithium battery pack circuit feeds back the fault information to the inverter integrated circuit; if the self-checking is successful, pre-charging is carried out, namely, Kn1 is controlled to be closed, Kn2 is controlled to be opened, Kn3 is controlled to be opened, after 5 seconds of delay or after the delay of the preset time, Kn1 is controlled to be opened, Kn2 is controlled to be closed, and Kn3 is controlled to be closed (for a slave lithium battery circuit, such as a battery pack 1, K1 is controlled to be closed, K2 is controlled to be opened, K3 is controlled to be opened, and K1 is controlled to be opened, K2 is controlled to be closed, and K3 is controlled to be closed after 5 seconds of delay or after the delay of the preset time), so that.
Furthermore, the main lithium battery pack circuit and the slave lithium battery pack circuit respectively comprise a wake-up switch connected with the MCU controller circuit, and the wake-up switch is used for manually carrying out self-checking on the battery management system BMS. As shown in fig. 1, in the main lithium battery pack circuit, closing the wake-up switch Sn2 to perform self-test on the battery management system BMS; from the lithium battery pack circuit, closing the wake-up switch S2 performs self-check on the battery management system BMS. Similarly, if the self-checking is unsuccessful, a fault is reported and fault information is fed back to the main lithium battery pack circuit and is fed back to the inverter all-in-one machine by the main lithium battery pack circuit; if the self-checking is successful, the rest of the control processes are the same as the above, and are not described again here.
Wherein, the lithium cell group charges, the in-process that discharges, and battery management system BMS all charges, discharge protection to the lithium cell group, and is specific:
(1) when the inverter all-in-one machine charges the lithium battery pack, when faults such as excessive current, excessive temperature and excessive voltage occur, namely the AFE module detects that the current value, the voltage value, the temperature value and the like of the lithium battery exceed corresponding preset values, the MCU controller firstly controls the Kn3 to be disconnected until the preset conditions are recovered (for example, after one minute is delayed or the current value, the voltage value and the temperature value are reduced to be below the preset values), and then the MCU controller controls the Kn3 to be closed so as to charge and protect the lithium battery pack.
(2) When the inverter all-in-one machine discharges the lithium battery pack, when faults such as overlarge current, overhigh temperature, overlow voltage and the like occur, namely the AFE module detects that the current value, the voltage value, the temperature value and the like of the lithium battery are not within the range of corresponding preset values, the MCU controller firstly controls the Kn2 to be disconnected until the preset conditions are recovered (for example, after one minute is delayed or the current value, the voltage value and the temperature value are reduced to be below the preset values), and then the MCU controller controls the Kn2 to be closed so as to perform discharge protection on the lithium battery pack.
Specifically, as shown in fig. 1, the inverter-integrated circuit includes a filter, a photovoltaic controller, a rectifier, an inverter, and a static switch, an input end of the filter is connected to a commercial power input interface circuit of the inverter-integrated circuit, an output end of the filter is connected to an input end circuit of the rectifier after being connected to an input switch Su3 circuit, an output end of the rectifier is connected to an input end circuit of the inverter, and an output end of the inverter is connected to an output switch Su6 circuit after being connected to a static switch Su5 circuit; the output end of the filter is connected with a bypass switch Su2 circuit and then is connected with one end circuit of an electrostatic switch Su4, the other end of the electrostatic switch Su4 is connected with a circuit of a connection midpoint a of an output switch Su6 and a static switch Su5, and the output switch Su6 is connected with a circuit load output end of the inverter all-in-one machine circuit; a maintenance switch Su1 is connected in series between the output end of the filter and the load output end of the inverter all-in-one machine circuit; the connection midpoint b of the rectifier and the inverter is connected with the battery input interface circuit; during charging, mains supply is input through the input end of the inverter all-in-one machine, is filtered by the filter and then is rectified and output to the battery input end through the rectifier bridge to charge the lithium battery pack; during discharging, the lithium battery is input into the inverter all-in-one machine through the battery input end, and then the direct current is converted into alternating current through the inverter and then output to supply power for the load.
As shown in fig. 1, when commercial power is input, the commercial power is filtered by a filter, the maintenance switch Su1 is disconnected, the bypass switch Su2 is disconnected, the filtered commercial power is rectified by a rectifier, and then the ac power is converted into dc power to charge the lithium battery pack; when the branch of the input switch Su3 is disconnected or has a fault, the bypass switch Su2 is closed and the output switch Su6 is opened, so that the commercial power is converted from alternating current to direct current through the inverter and then is output to the battery input end of the inverter all-in-one machine to charge the lithium battery.
When the lithium battery pack supplies power to the load, the input switch Su3 is disconnected, the maintenance switch Su1 is disconnected, the bypass switch Su2 is disconnected, the output switch Su6 is closed, direct current output by the lithium battery pack is processed by the inverter and then is converted into direct current, and the direct current is input from the load output end of the inverter all-in-one machine to supply power to the load. Similarly, when the branch of the inverter is disconnected or has a fault, the input switch Su3 and the bypass switch Su2 are closed, the maintenance switch Su1 is disconnected, and direct current output by the lithium battery pack is processed by the rectifier, is converted into direct current from direct current, and is input from the load output end of the inverter all-in-one machine to supply power to the load.
It can be seen that no matter the charging process or the discharging process of the lithium battery, two branches are provided, so that the lithium battery cannot be used or charged when a fault occurs, and when the two branches have a problem, the input switch Su3 and the bypass switch Su2 are disconnected, the maintenance switch Su1 and the output switch Su6 are closed, and the load is supplied with power through the mains supply, so that the fault of the inverter all-in-one machine is checked.
The inverter all-in-one circuit further comprises a photovoltaic controller and a photovoltaic input interface, the photovoltaic input interface is connected with the photovoltaic control circuit through an input switch Su7, and the output end of the photovoltaic controller is connected with the connection midpoint b in a circuit mode; photovoltaic electric energy is accessed through a photovoltaic input interface, processed and rectified by a photovoltaic controller and then output to a battery input end to charge a lithium battery. Therefore, in the embodiment of the invention, the lithium battery pack can be charged by commercial power or solar energy.
The inverter all-in-one machine can control the charging and discharging power of the lithium battery pack in the main lithium battery pack circuit and the slave lithium battery pack according to the state information of the lithium battery pack fed back by the main lithium battery pack circuit. Specifically, when the lithium battery pack is charged, the MCU controller feeds back the allowable charging current and the allowable charging voltage to the inverter all-in-one machine according to the conditions of the currently detected voltage, current, temperature and the like of the lithium battery pack, and the inverter all-in-one machine charges the lithium battery pack according to the allowable charging current and the allowable charging voltage to control the output charging power. Similarly, when the lithium battery discharges, the MCU controller feeds back the allowable discharge current and the allowable discharge voltage to the inverter all-in-one machine according to the currently detected voltage, current, temperature and other conditions of the lithium battery pack, and the inverter all-in-one machine controls the discharge electric power of the lithium battery according to the allowable discharge current and the allowable discharge voltage. The allowable charging current, the allowable charging voltage, the allowable discharging current and the allowable discharging voltage are all related to the voltage, the current, the temperature and the like of the lithium battery pack during working, and related workers are arranged in the MCU controller after calculation; the respective voltage, current, temperature values correspond to respective allowed charging current, allowed charging voltage, allowed discharging current and allowed discharging voltage.
For example, when the temperature of the corresponding lithium battery pack is detected to be too high, the lithium battery sends a small allowable charging current value to the inverter all-in-one machine, and the inverter all-in-one machine reduces the charging current through an internal circuit of the inverter all-in-one machine according to comparison between the actual current and the allowable charging current value.
In summary, the lithium battery pack module is divided into the master lithium battery pack circuit and the slave lithium battery pack circuits, wherein the master lithium battery pack circuit is communicated with the plurality of slave lithium battery pack circuits through the RS485 circuit to collect the state information of all the lithium battery packs through the master lithium battery pack circuit, and then the master lithium battery pack circuit is communicated with the inverter all-in-one machine through the CAN circuit to collect the state information of all the lithium battery packs into the inverter all-in-one machine, so that the inverter all-in-one machine CAN control the charging and discharging conditions of each lithium battery pack according to the state information of each lithium battery pack.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A parallel operation system of a household energy storage inverter and a lithium battery is characterized by comprising an inverter integrated circuit, a main lithium battery pack circuit and a plurality of auxiliary lithium battery pack circuits, wherein the main lithium battery pack circuit is in communication connection with the inverter integrated circuit through a CAN (controller area network), and the main lithium battery pack circuit is in communication connection with the auxiliary lithium battery pack circuits through RS 485; the main lithium battery pack circuit acquires and collects state information of the lithium battery pack in the slave lithium battery pack circuit through an RS485 interface, the state information and the state information of the lithium battery pack in the main lithium battery pack circuit are fed back to the inverter all-in-one circuit through the CAN communication interface, and the inverter all-in-one circuit adjusts charging and discharging power of the main lithium battery pack circuit and the lithium battery pack in the slave lithium battery pack according to the state information.
2. The parallel operation system of the household energy storage inverter and the lithium battery as claimed in claim 1, wherein the master lithium battery pack circuit and the slave lithium battery pack circuit have the same circuit structure and comprise a lithium battery pack and a battery management system BMS, the battery management system BMS comprises a dial switch, a discharge MOS (metal oxide semiconductor) tube, a charge MOS tube, a pre-charge resistor, a detection resistor, an MCU (micro control unit) controller for controlling the charging of the lithium battery and an AFE (automatic object function) module for acquiring the state information of the lithium battery pack, and the MCU controller, the AFE module and the lithium battery pack are in circuit connection; the positive output P + of the inverter all-in-one circuit is respectively connected with the battery management system BMS and the lithium battery pack circuit, the positive output P-of the inverter all-in-one circuit is connected with the source electrode circuit of the charging MOS tube, the drain electrode of the charging MOS tube is connected with the drain electrode circuit of the discharging MOS tube, the source electrode of the discharging MOS tube is connected with the detection resistor circuit, and the detection circuit is connected with the negative electrode circuit of the lithium battery pack; one end of the pre-charging resistor is connected with a source electrode circuit of the charging MOS tube, the other end of the pre-charging resistor is connected with a drain electrode circuit of the pre-charging MOS tube, and a source electrode of the pre-charging MOS tube is connected with a source electrode circuit of the discharging MOS tube; the gate of the pre-charging MOS tube is connected with an MCU controller circuit through a switch Kn1, the gate of the discharging MOS tube is connected with the MCU controller circuit through a switch Kn2, the gate of the discharging MOS tube is connected with the MCU controller circuit through a switch Kn3, and the switch Kn1, the switch Kn2 and the switch Kn3 are controlled through the MCU controller; and the dial switch is in circuit connection with the MCU controller.
3. The parallel operation system of the household energy storage inverter and the lithium battery as claimed in claim 2, wherein the main lithium battery pack circuit further comprises a wake-up switch connected with the MCU controller circuit for manually starting charging or discharging the lithium battery.
4. The parallel machine system of the household energy storage inverter and the lithium battery as claimed in claim 1, wherein the inverter all-in-one machine circuit comprises a filter, a rectifier, an inverter and a static switch, the input end of the filter is connected with the commercial power input interface circuit of the inverter all-in-one machine circuit, the output end of the filter is connected with the input end circuit of the rectifier after being connected with the input switch Su3 circuit, the output end of the rectifier is connected with the input end circuit of the inverter, and the output end of the inverter is connected with the output switch Su6 circuit after being connected with the static switch Su5 circuit; the output end of the filter is connected with a bypass switch Su2 circuit and then is connected with one end circuit of an electrostatic switch Su4, the other end of the electrostatic switch Su4 is connected with a circuit of a connection midpoint a of an output switch Su6 and a static switch Su5, and the output switch Su6 is connected with a circuit load output end of the inverter all-in-one machine circuit; a maintenance switch Su1 is connected in series between the output end of the filter and the load output end of the inverter all-in-one machine circuit; the connection midpoint b of the rectifier and the inverter is connected with the battery input interface circuit; during charging, mains supply is input through the input end of the inverter all-in-one machine, is filtered by the filter and then is rectified and output to the battery input end through the rectifier bridge to charge the lithium battery pack; during discharging, the lithium battery is input to a battery input interface of the inverter all-in-one machine through a battery input end, and then direct current is converted into alternating current through the inverter and then output to supply power for a load.
5. The parallel machine system of the household energy storage inverter and the lithium battery as claimed in claim 4, wherein the inverter integrated circuit further comprises a photovoltaic controller and a photovoltaic input interface, the photovoltaic input interface is connected with the photovoltaic control circuit through an input switch Su7, and the output end of the photovoltaic controller is connected with the connection midpoint b in a circuit manner; photovoltaic electric energy is accessed through a photovoltaic input interface, processed and rectified by a photovoltaic controller and then output to a battery input end to charge a lithium battery.
6. The parallel operation system of the household energy storage inverter and the lithium battery as claimed in claim 2, wherein when the inverter all-in-one machine charges the lithium battery pack, the MCU controller first controls Kn3 to be turned off when the lithium battery pack has over-temperature, over-current and over-voltage faults, and then closes Kn3 to protect the lithium battery pack from charging after the preset conditions are restored.
7. The parallel operation system of the household energy storage inverter and the lithium battery as claimed in claim 2, wherein when the inverter all-in-one machine discharges the lithium battery pack, the MCU controller first controls Kn2 to be turned off when the lithium battery pack has over-temperature, over-current and under-voltage faults, and then closes Kn2 to perform discharge protection on the lithium battery pack after the preset conditions are restored.
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| CN201911385282.0A CN111030244A (en) | 2019-12-28 | 2019-12-28 | Household energy storage inverter and lithium battery parallel operation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023065574A1 (en) * | 2021-10-22 | 2023-04-27 | 维谛技术有限公司 | Lithium battery system, control method and apparatus, and storage medium and processor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023065574A1 (en) * | 2021-10-22 | 2023-04-27 | 维谛技术有限公司 | Lithium battery system, control method and apparatus, and storage medium and processor |
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