CN212588140U - A positive negative lithium cell parallel operation system for UPS - Google Patents
A positive negative lithium cell parallel operation system for UPS Download PDFInfo
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- CN212588140U CN212588140U CN202021168088.5U CN202021168088U CN212588140U CN 212588140 U CN212588140 U CN 212588140U CN 202021168088 U CN202021168088 U CN 202021168088U CN 212588140 U CN212588140 U CN 212588140U
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 30
- 238000007599 discharging Methods 0.000 claims abstract description 65
- 238000012544 monitoring process Methods 0.000 claims abstract description 31
- 238000005259 measurement Methods 0.000 claims abstract description 8
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 10
- 238000004891 communication Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000002265 prevention Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides a positive negative lithium cell parallel operation system for UPS, including power bus, single cabinet system, control board and bus current-voltage measurement module all the way at least, single cabinet system includes: the charging and discharging circuit control module is connected to the battery management module through the positive and negative battery packs, and the battery management module is connected with the power supply module; the charging and discharging loop control module comprises a positive battery charging and discharging control unit and a negative battery charging and discharging control unit, the positive and negative battery packs are connected to a control board through a slave control board of the battery management module, and the control board and the bus current and voltage measurement module are respectively connected with the monitoring board. The utility model discloses can supply power for well high-power UPS, and possess the total electric quantity of parallel operation function in order to expand power supply battery system, increase reserve time.
Description
Technical Field
The utility model relates to a incessant lithium battery system especially relates to a positive negative lithium cell parallel operation system for UPS.
Background
In the fields of industrial manufacturing and informatization, the continuous and stable operation of a power supply system matched with equipment is a premise for ensuring the normal operation of the equipment. UPS refers to Uninterruptible Power Supply (UPS), which is a device that provides "backup Power" for critical equipment. When the commercial power is not powered off, the unstable commercial power can provide stable power supply for equipment after being converted by the UPS. When the commercial power is disconnected, the UPS is seamlessly switched from the commercial power mode to the battery mode, the direct current output by the battery is inverted into alternating current to supply power to the equipment, the equipment is prevented from power failure in the whole process, sufficient response time is reserved, and an operator is allowed to stop working procedures to save work such as data.
Disclosure of Invention
The utility model aims to solve the technical problem that a need provide one kind can be for the power supply of high-power UPS, and possess the total electric quantity of parallel operation function in order to expand power supply battery system, increase the positive and negative lithium cell parallel operation system that is used for UPS of reserve time.
To this, the utility model provides a positive negative lithium cell parallel operation system for UPS, including power bus and single cabinet system, control board and bus current-voltage measurement module all the way at least, single cabinet system includes: the charging and discharging circuit control module is connected to the battery management module through the positive and negative battery packs, the battery management module is connected with the power supply module, and the power supply module and the charging and discharging circuit control module are both connected to the power bus through the output switch; the charging and discharging loop control module comprises a positive battery charging and discharging control unit and a negative battery charging and discharging control unit, the positive and negative battery packs comprise positive battery packs and negative battery packs, the battery management module comprises a slave control board and a control board, the positive battery packs and the negative battery packs are respectively connected to the control board through the slave control board, the positive battery packs are connected to the positive battery charging and discharging control unit, the positive battery charging and discharging control unit is connected to the power bus through the output switch, the negative battery packs are connected to the negative battery charging and discharging control unit, and the negative battery charging and discharging control unit is connected to the power bus through the output switch; the control panel is connected with the monitoring panel, and the monitoring panel is connected with the bus current and voltage measuring module.
The utility model discloses a further improvement lies in, positive group battery is connected to through fuse and hall sensor positive battery charge and discharge control unit, the negative group battery is connected to through fuse and hall sensor negative battery charge and discharge control unit.
The utility model discloses a further improvement lies in, positive cell charge-discharge control unit includes positive cell discharge circuit, positive cell discharge circuit includes that first prevent anti-diode, first pre-charge resistance, first discharge contactor and first pre-charge contactor, first negative pole of preventing anti-diode is connected to output switch, first positive pole of preventing anti-diode is connected to respectively the one end of first pre-charge resistance and the one end of first discharge contactor, the other end of first pre-charge resistance is connected to the one end of first pre-charge contactor, the other end of first discharge contactor and the other end of first pre-charge contactor are connected to hall sensor, hall sensor passes through the fuse and is connected to the positive battery group.
The utility model discloses a further improvement lies in, positive cell charge-discharge control unit still includes positive cell charging circuit, positive cell charging circuit includes third prevention anti-diode and first charging contactor, the anodal of third prevention anti-diode is connected to output switch, the negative pole of third prevention anti-diode passes through first charging contactor is connected to hall sensor.
The utility model discloses a further improvement lies in, negative cell charge-discharge control unit includes the negative cell return circuit that discharges, the negative cell return circuit that discharges includes the second prevents that diode, second pre-charge resistance, second discharge contactor and second pre-charge contactor, the second prevents that the positive pole of diode is connected to output switch, the second prevents that the negative pole of diode is connected to respectively the one end of second pre-charge resistance and the one end of second discharge contactor, the other end of second pre-charge resistance is connected to the one end of second pre-charge contactor, the other end of second discharge contactor and the other end of second pre-charge contactor are connected to hall sensor, hall sensor passes through the fuse and is connected to the negative battery group.
The utility model discloses a further improvement lies in, negative battery charge and discharge control unit still includes negative battery charging circuit, negative battery charging circuit includes that the fourth prevents that anti-diode and second charge contactor, the fourth prevents that anti-diode's negative pole is connected to output switch, the fourth prevents that anti-diode's positive pole passes through the second charges the contactor and is connected to hall sensor.
The utility model discloses a further improvement lies in, positive negative group battery includes any one in positive negative 240V group battery, positive negative 96V group battery, positive negative 256V group battery, positive negative 307.2V group battery and positive negative 358.4V group battery.
The utility model discloses a further improvement lies in, positive battery group and negative battery group of positive negative 240V group battery are established ties by 5 battery module respectively and are constituteed, and wherein each battery module is established ties by 15 sections lithium iron phosphate batteries and is constituteed; the positive battery pack and the negative battery pack of the positive 96V battery pack and the negative 96V battery pack are respectively formed by connecting 2 battery modules in series, and each battery module is formed by connecting 15 lithium iron phosphate batteries in series.
The utility model discloses a further improvement lies in, still includes the control board, the quantity of list cabinet system is more than two the tunnel, and each list cabinet system of way all is connected to power bus through its output switch, each list cabinet system of way power supply module and control panel all with the control board is connected, control board and power bus are connected with UPS respectively.
The utility model discloses a further improvement lies in, still includes bus current voltage measurement module, bus current voltage measurement module set up in on the power bus, and with the control board is connected.
Compared with the prior art, the beneficial effects of the utility model reside in that: through the design of the single cabinet system, a positive and negative lithium battery parallel operation system for the UPS can be further realized, the power can be supplied to the medium and high power UPS, the parallel operation function is provided to expand the total electric quantity of a power supply battery system and increase the backup time, and a three-level BMS framework is adopted to manage the lithium battery parallel operation; on the basis, the separate design of a charge-discharge loop is realized, the charging of the battery is protected, and the condition of power failure is also ensured not to occur; the mutual charging current of the single cabinet system is well protected, components and parts cannot be damaged due to overlarge current, the parallel operation efficiency cannot be influenced due to too low current, and the power supply requirements of high efficiency and high stability of the existing industrialization are well met.
Drawings
FIG. 1 is a schematic diagram of a single-cabinet power supply topology according to an embodiment of the present invention based on positive and negative 240V lithium batteries;
fig. 2 is a schematic view of a topology of a charge-discharge loop control module according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a topology of a battery management module according to an embodiment of the present invention;
fig. 4 is a schematic view of the topology of an embodiment of the present invention;
fig. 5 is a schematic diagram of a single-cabinet power supply topology according to an embodiment of the present invention based on a positive and negative 96V lithium battery.
Detailed Description
Preferred embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 4, this example provides a positive and negative lithium battery parallel operation system for a UPS, including a power bus, at least one single cabinet system 1, a monitoring board 2, and a bus current and voltage measuring module 3, where the single cabinet system 1 includes: the charging and discharging circuit control system comprises a positive battery pack, a negative battery pack, a battery management module, a power supply module 102, a charging and discharging circuit control module 103 and an output switch 104, wherein the charging and discharging circuit control module 103 is connected to the battery management module through the positive battery pack and the negative battery pack, the battery management module is connected with the power supply module 102, and the power supply module 102 and the charging and discharging circuit control module 103 are both connected to a power bus through the output switch 104; the charge and discharge loop control module 103 comprises a positive battery charge and discharge control unit 1031 and a negative battery charge and discharge control unit 1032, the positive and negative battery packs comprise a positive battery pack 1011 and a negative battery pack 1012, the battery management module comprises a slave control board 1013 and a control board 1014, the positive battery pack 1011 and the negative battery pack 1012 are respectively connected to the control board 1014 through the slave control board 1013, the positive battery pack 1011 is connected to the positive battery charge and discharge control unit 1031 through a fuse 105 and a hall sensor 106, the positive battery charge and discharge control unit 1031 is connected to the power bus through the output switch 104, the negative battery pack 1012 is connected to the negative battery charge and discharge control unit 1032 through the fuse 105 and the hall sensor 106, and the negative battery charge and discharge control unit 1032 is connected to the power bus through the output switch 104; the control board 1014 is connected with the monitoring board 2, and the monitoring board 2 is connected with the bus current and voltage measuring module 3. The power supply module 102 is preferably a DC-DC power panel; the battery management module preferably includes 10 slave control boards 1013 and 1 control board 1014.
Wherein, fig. 1 shows a schematic topological structure diagram of a single-cabinet system 1 based on positive and negative 240V lithium batteries; fig. 4 shows a positive-negative lithium battery parallel system of the three-way single cabinet system 1; FIG. 5 is a schematic diagram of a topology structure of a single-cabinet system 1 based on a positive and negative 96V lithium battery; in practical application, the number of the single cabinet systems 1 can be adjusted according to practical application scenes and requirements; the UPS is an uninterruptible power supply of matched power supply equipment in the fields of industry and information.
As shown in fig. 2, the positive battery charging and discharging control unit 1031 in this example includes a positive battery discharging circuit and a positive battery charging circuit, the positive battery discharging circuit includes a first anti-reverse diode, a first pre-charging resistor, a first discharging contactor, and a first pre-charging contactor, a cathode of the first anti-reverse diode is connected to the output switch 104, an anode of the first anti-reverse diode is connected to one end of the first pre-charging resistor and one end of the first discharging contactor, respectively, the other end of the first pre-charging resistor is connected to one end of the first pre-charging contactor, the other end of the first discharging contactor and the other end of the first pre-charging contactor are connected to a hall sensor 106, and the hall sensor 106 is connected to the positive battery group 1011 through a fuse 105; the positive battery charging circuit comprises a third anti-reflection diode and a first charging contactor, wherein the anode of the third anti-reflection diode is connected to the output switch 104, and the cathode of the third anti-reflection diode is connected to the hall sensor 106 through the first charging contactor.
As shown in fig. 2, the negative battery charging and discharging control unit 1032 includes a negative battery discharging circuit and a negative battery charging circuit, the negative battery discharging circuit includes a second anti-reverse diode, a second pre-charging resistor, a second discharging contactor, and a second pre-charging contactor, an anode of the second anti-reverse diode is connected to the output switch 104, a cathode of the second anti-reverse diode is connected to one end of the second pre-charging resistor and one end of the second discharging contactor, respectively, the other end of the second pre-charging resistor is connected to one end of the second pre-charging contactor, the other end of the second discharging contactor and the other end of the second pre-charging contactor are connected to a hall sensor 106, and the hall sensor 106 is connected to the negative battery group 1012 through a fuse 105; the negative battery charging circuit comprises a fourth anti-reverse diode having a cathode connected to the output switch 104 and an anode connected to the hall sensor 106 via the second charging contact, and a second charging contact.
That is, in this example, the positive battery pack 1011 and the negative battery pack 1012 are branched into two branches (a charging loop and a discharging loop), and the discharging loop is branched into two branches again: a pre-charging circuit and a main discharging circuit; the charging loop and the discharging loop are separated, and anti-reverse diodes are connected in series in the two loops; a Hall sensor is connected in series in the main loop to detect charging and discharging current; the purpose of this example design like this is that when battery charging protection, the contact that charges can in time break off, if the commercial power disconnection, the battery can discharge through the return circuit that discharges this moment, and the UPS can not appear the condition of losing power, and then improves its safety and reliable performance.
The charge and discharge control principle of this embodiment is that after the system is power-on self-test without abnormality, the first charging contactor, the second charging contactor, the first pre-charging contactor and the second pre-charging contactor are closed, and the total voltage V of the positive battery pack 1011 and the negative battery pack 1012 is detected at the same timeBatAnd a load voltage VLoadWhen V isBat-VLoadSet voltage V is less than or equal tosClosing the first discharging contactor and the second discharging contactor, and simultaneously opening the first pre-charging contactor and the second pre-charging contactor; when the charging fault or charging protection occurs, the first charging contactor and the second charging contactor are opened, the first discharging contactor and the second discharging contactor are closed, and the positive battery group 1011 and the negative battery group 1012 discharge to the load; when the first and second discharging contacts are opened after a discharging fault or discharging protection, the first and second charging contacts are closed, and the charger charges the positive battery group 1011 and the negative battery group 1012.
It is worth to be noted that the embodiment is applied to the positive and negative lithium battery parallel operation system of the UPSWith its particularity, according to the topology design of this example, it sets the voltage VsThe size of the transformer can not be too high or too low, and the too high can cause the over-high mutual charging current of the cabinet system 1 and damage components; too low affects the efficiency of use, the set voltage V in this examplesThe voltage threshold is preset, and the best effect is achieved when the voltage threshold is preferably 4-9V. It should be noted that the specific size of the value is obtained by combining iterative tuning and topology improvement, and is not easily imaginable or obtained by limited experiments by the inventor, because each adjustment of the data combines the topology improvement, and the two are continuously designed and optimized, and the overall scheme is not a conventional design.
As shown in fig. 3, the positive battery pack 1011 and the negative battery pack 1012 each include at least two lithium battery modules, each of which measures state information of each lithium battery module through a corresponding slave control board 1013, and then transmits the state information to the control board 1014 through an internal CAN bus, where the state information includes current information, voltage information, temperature information, and the like.
As shown in fig. 1 and fig. 5, in the battery management module of this embodiment, the positive and negative battery packs include a positive and negative 240V battery pack or a positive and negative 96V battery pack, and as shown in fig. 1, when the positive and negative battery packs are positive and negative 240V battery packs, the positive battery pack 1011 and the negative battery pack 1012 are respectively formed by connecting 5 battery modules in series, where each battery module is formed by connecting 15 lithium iron phosphate batteries in series (i.e., the positive battery pack 1011 is preferably formed by connecting 5 lithium iron phosphate battery modules in series and then forming a 240V positive battery pack, the negative battery pack 1012 is preferably formed by connecting 5 lithium iron phosphate battery modules in series and then forming a 240V negative battery pack, the positive battery pack 1011 and the negative battery pack are connected in series and then leading out an N (neutral) line from the middle of the positive battery pack and the negative battery pack 1012, and the outlet terminal of the positive electrode of the positive battery pack, each lithium battery module realizes the measurement of state information through a corresponding slave control board, and then transmits the state information to the control board 1014 through an internal CAN bus, wherein the state information comprises current information, voltage information and temperature information; as shown in fig. 5, when the positive and negative battery packs are positive and negative 96V battery packs, the positive battery pack 1011 and the negative battery pack 1012 are respectively formed by connecting 2 battery modules in series, each battery module is formed by connecting 15 lithium iron phosphate batteries in series, each lithium battery module realizes the measurement of state information through a corresponding slave control board 1013, and then transmits the state information to the control board 1014 through an internal CAN bus, the state information includes current information, voltage information and temperature information, the positive battery pack 1011 and the negative battery pack 1012 of the positive and negative 96V battery packs are respectively connected to a circuit breaker through the fuse 105, and the circuit breaker is connected to the charging and discharging circuit control module 103 through the hall sensor 106.
That is, this embodiment is applied to a UPS environment such as a plus-minus 240V battery pack and a plus-minus 96V battery pack, and the design of the corresponding charge/discharge circuit control module 103 is not changed, and it is only necessary to modify the power pin connection of the power supply module 102 (DC-DC power board) by adaptively changing the number of slave control modules 1013 and the number of lithium battery modules.
Of course, in practical application, each battery module may be formed by connecting 16 or 17 lithium iron phosphate batteries in series, instead of 15 lithium iron phosphate batteries in series. In addition, in practical application, the battery pack is not limited to a positive and negative 240V battery pack or a positive and negative 96V battery pack, but may be applied to battery packs with different voltages, such as a positive and negative 240V battery pack, a positive and negative 256V battery pack, a positive and negative 307.2V battery pack, a positive and negative 358.4V battery pack, and the positive and negative 96V battery packs according to the positive and negative voltage specifications increase with the number of batteries connected in series.
The slave 1013 is a BMS slave belonging to the first-level BMS, and the positive battery group 1011 and the negative battery group 1012 are respectively connected to 5 BMS slaves. Each BMS slave monitors 1 battery module of 15 strings, measures status information such as current, voltage, and temperature thereof, and transmits to the control board 1014 (BMS master control unit, second-level BMS) through an internal CAN bus.
The control board 1014 in this example is a BMS master control unit belonging to the second level BMS, which communicates with the slave control board 1013 via an internal CAN bus and transmits the obtained status information to the monitoring board, i.e. a BMS monitoring board (belonging to the third level BMS).
As shown in fig. 4, the present embodiment further includes a monitoring board 2, the number of the single cabinet systems 1 is more than two, each single cabinet system 1 is connected to a power bus through an output switch 104 of the single cabinet system, a power supply module 102 and a control board 1014 of each single cabinet system 1 are connected to the monitoring board 2, and the monitoring board 2 and the power bus are respectively connected to the UPS.
The external CAN communication of this example is used to realize that the BMS main control unit of each single cabinet system 1 is connected with the BMS monitoring board through the external CAN communication, and then all CAN be mounted under the same CAN network. The power supply BUS is actually a power supply BUS, BAT +, BATN and BAT-of each single cabinet system 1 are respectively connected to BUS _ BAT +, BUS _ BATN and BUS _ BAT-power supply buses, and voltage and current can be output to the buses when a manual PACK output switch of the single cabinet system 1 is closed. The BUS current and voltage measuring module 3 is used for realizing that the BMS monitoring board detects the total current and the voltage on BUS _ BAT + and BUS _ BAT-. And the power supply of the monitoring board 2 is from each single cabinet system 1, and the current output by the DC-DC power supply board of the single cabinet system 1 supplies power to the monitoring board 2 through an anti-reverse diode. The monitoring board 2 communicates with the UPS, and communication modes including TTL communication, 232 communication, 485 communication and CAN communication CAN be adopted.
As shown in fig. 4, the present embodiment further includes a bus current and voltage measuring module 3, where the bus current and voltage measuring module 3 is disposed on the power bus and connected to the monitoring board 2.
When the single cabinet system 1 is in the battery power supply starting mode, in this example, the single cabinet system 1 is in the shutdown state, the pin 6 and the pin 7 of the power supply module 102 are respectively connected to the negative electrode of the negative battery pack 1012 and the positive electrode of the positive battery pack 1011, the DC-DC power panel switch of the power supply module 102 is pressed for a long time, the power supply module 102 is conducted with the battery loops of the positive battery pack 1011 and the negative battery pack 1012, the lithium battery module takes power, the power is supplied to the control panel 1014 through the pin 4 after DC-DC voltage transformation, the power supply module 102 supplies power to the slave control panel 1013 through the pin 5, and finally, all the single cabinet systems 1 are respectively started by independently pressing the switches.
When in a UPS power supply starting mode, pins 1 and 2 of the power supply module 102 are connected to BUS _ BAT + and BUS _ BAT-of the power BUS, respectively, when the single cabinet system 1 is in a shutdown state, the output switches 104 (preferably PACK output switches) of all the single cabinet systems 1 are turned on, the mains supply is turned on, the mains supply starts the UPS, the UPS forcibly charges the single cabinet system 1 through the pins 1 and 2 of the power supply module 102 to provide a charging voltage, after DC-DC rectification and transformation, the power supply module 102 supplies power to the control board 1014 through pin 4, and then supplies power to the slave control board 1013 through pin 5 to start the single cabinet system 1, and the power BUS starts all the single cabinet systems 1 through DC-DC.
After the single-cabinet system 1 is started, the positive battery set 1011 and the negative battery set 1012 supply power to the one, two and three-stage BMS (i.e., the slave control board 1013, the master control board 1014 and the monitor board 2), and the power supply loop is consistent with the battery power supply starting loop.
The system boot of the present example may include a manual boot and an auto-boot. The manual starting is to manually start each single cabinet system 1, the DC power supply of the single cabinet system 1 outputs a DC current, and the monitoring board 2 is started. The automatic start-up is that the charger outputs direct current charging voltage, the DC power supply of each single cabinet system 1 is automatically started up when power is obtained, meanwhile, the DC power supply outputs DC current outwards, and the monitoring board 2 is started up.
As shown in fig. 4, the parallel operation condition is that after each single cabinet system 1 is connected to the parallel operation system through the internal CAN communication, whether the single cabinet system 1 is connected in parallel to the parallel operation system (whether the charging contactor, the discharging contactor and the pre-charging contactor are closed) is controlled by the instruction of the monitoring board 2, and the control board of the single cabinet system 1 cannot pass through the monitoring board instruction to privately control the opening or closing of the corresponding contactor. The monitoring board 2 detects the state of each single cabinet system 1, detects the voltage of each single cabinet system 1, when the differential pressure between the single cabinet systems 1 is less than or equal to a set voltage Vp, the monitoring board 2 sends an instruction to enable the corresponding single cabinet to be merged into the system, the set voltage Vp is determined according to the string number/voltage of single packets, for example, 75 strings and 240V of the single packet, the selected range of the set voltage Vp is 5-10V, the upper limit and the lower limit of the single packet are both adjusted up when the voltage of the single packet is higher than 240V, the upper limit and the lower limit are both adjusted down when the voltage of the single packet is lower than 240V, and the.
In the charge/discharge control of the parallel operation system in this embodiment, the monitoring board 2 communicates with the load and the charger, and notifies the load or the charger according to the state condition of the parallel operation battery system, so that the battery system can discharge the load or the charger can charge the battery system. In the protection situation, when the single cabinet system 1 needs protection and other emergency situations, the control panel of the single cabinet system controls the charging contactor, the discharging contactor and the pre-charging contactor to be disconnected, and then information is reported to the monitoring panel 2.
In summary, in the present embodiment, the single cabinet system 1 is designed, so that a positive and negative lithium battery parallel operation system for the UPS can be implemented, a medium-and-high-power UPS can be supplied with power, a parallel operation function is provided to expand the total power of a power supply battery system and increase the backup time, and a three-level BMS architecture is adopted to manage the lithium battery parallel operation; on the basis, the separate design of a charge-discharge loop is realized, the charging of the battery is protected, and the condition of power failure is also ensured not to occur; the mutual charging current of the single cabinet system 1 is well protected, components and parts cannot be damaged due to overlarge current, the parallel operation efficiency cannot be influenced due to too low current, and the power supply requirements of high efficiency and high stability of the existing industrialization are well met.
The above-mentioned embodiments are the preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-mentioned embodiments, and the scope of the present invention includes and is not limited to the above-mentioned embodiments, and all equivalent changes made according to the shape and structure of the present invention are within the protection scope of the present invention.
Claims (10)
1. The utility model provides a positive negative lithium cell system of combining for UPS which characterized in that, includes power bus and at least one way single cabinet system, control board and bus current voltage measurement module, single cabinet system includes: the charging and discharging circuit control module is connected to the battery management module through the positive and negative battery packs, the battery management module is connected with the power supply module, and the power supply module and the charging and discharging circuit control module are both connected to the power bus through the output switch; the charging and discharging loop control module comprises a positive battery charging and discharging control unit and a negative battery charging and discharging control unit, the positive and negative battery packs comprise positive battery packs and negative battery packs, the battery management module comprises a slave control board and a control board, the positive battery packs and the negative battery packs are respectively connected to the control board through the slave control board, the positive battery packs are connected to the positive battery charging and discharging control unit, the positive battery charging and discharging control unit is connected to the power bus through the output switch, the negative battery packs are connected to the negative battery charging and discharging control unit, and the negative battery charging and discharging control unit is connected to the power bus through the output switch; the control panel is connected with the monitoring panel, and the monitoring panel is connected with the bus current and voltage measuring module.
2. The system of claim 1, wherein the positive battery pack is connected to the positive battery charge and discharge control unit through a fuse and a hall sensor, and the negative battery pack is connected to the negative battery charge and discharge control unit through a fuse and a hall sensor.
3. The positive-negative lithium battery parallel operation system for the UPS according to claim 1, wherein the positive battery charging and discharging control unit comprises a positive battery discharging circuit, the positive battery discharging circuit comprises a first anti-reverse diode, a first pre-charging resistor, a first discharging contactor and a first pre-charging contactor, a cathode of the first anti-reverse diode is connected to the output switch, an anode of the first anti-reverse diode is respectively connected to one end of the first pre-charging resistor and one end of the first discharging contactor, the other end of the first pre-charging resistor is connected to one end of the first pre-charging contactor, the other end of the first discharging contactor and the other end of the first pre-charging contactor are connected to a Hall sensor, and the Hall sensor is connected to the positive battery pack through a fuse.
4. The positive-negative lithium battery parallel operation system for the UPS of claim 3, wherein the positive battery charge-discharge control unit further comprises a positive battery charging loop, the positive battery charging loop comprises a third anti-diode and a first charging contact, the positive pole of the third anti-diode is connected to the output switch, and the negative pole of the third anti-diode is connected to the Hall sensor through the first charging contact.
5. The positive-negative lithium battery parallel operation system for the UPS of claim 4, wherein the negative battery charging and discharging control unit comprises a negative battery discharging circuit, the negative battery discharging circuit comprises a second anti-reverse diode, a second pre-charging resistor, a second discharging contactor and a second pre-charging contactor, wherein the anode of the second anti-reverse diode is connected to the output switch, the cathode of the second anti-reverse diode is respectively connected to one end of the second pre-charging resistor and one end of the second discharging contactor, the other end of the second pre-charging resistor is connected to one end of the second pre-charging contactor, the other end of the second discharging contactor and the other end of the second pre-charging contactor are connected to a Hall sensor, and the Hall sensor is connected to the negative battery pack through a fuse.
6. The system of claim 5, wherein the negative battery charge and discharge control unit further comprises a negative battery charge circuit comprising a fourth anti-reverse diode having a cathode connected to the output switch and a second charging contact, and wherein the anode of the fourth anti-reverse diode is connected to the Hall sensor through the second charging contact.
7. The positive-negative lithium battery parallel operation system for the UPS according to any one of claims 1 to 6, wherein the positive-negative battery pack comprises any one of a positive-negative 240V battery pack, a positive-negative 96V battery pack, a positive-negative 256V battery pack, a positive-negative 307.2V battery pack and a positive-negative 358.4V battery pack.
8. The positive-negative lithium battery parallel operation system for the UPS according to claim 7, wherein the positive battery pack and the negative battery pack of the positive-negative 240V battery pack are respectively composed of 5 battery modules connected in series, wherein each battery module is composed of 15 lithium iron phosphate batteries connected in series; the positive battery pack and the negative battery pack of the positive 96V battery pack and the negative 96V battery pack are respectively formed by connecting 2 battery modules in series, and each battery module is formed by connecting 15 lithium iron phosphate batteries in series.
9. The system according to any one of claims 1 to 6, further comprising a monitoring board, wherein the number of the single cabinet systems is two or more, each single cabinet system is connected to the power bus through its output switch, the power supply module and the control board of each single cabinet system are connected to the monitoring board, and the monitoring board and the power bus are respectively connected to the UPS.
10. The system of claim 9, further comprising a bus current and voltage measuring module, wherein the bus current and voltage measuring module is disposed on the power bus and connected to the monitoring board.
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| CN111786455A (en) * | 2020-06-22 | 2020-10-16 | 深圳科士达科技股份有限公司 | A positive negative lithium cell parallel operation system for UPS |
| CN111786455B (en) * | 2020-06-22 | 2023-12-26 | 深圳科士达科技股份有限公司 | Positive and negative lithium battery parallel operation system for UPS |
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Effective date of registration: 20220422 Address after: 355100 No. 8, Songshan Road, Xiapu Economic Development Zone, Ningde City, Fujian Province Patentee after: Ningde Shidai Keshida Technology Co.,Ltd. Address before: 518000 rooms 401 and 402, 4th floor, building 1, software park, kejizhong 2nd Road, Gaoxin North District, Nanshan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN KSTAR SCIENCE AND TECHNOLOGY Co.,Ltd. Patentee before: Shenzhen Keshida new energy Co., Ltd |