CN114825398A - Energy storage system suitable for communication base station lead-acid and lithium battery hybrid use and control method thereof - Google Patents
Energy storage system suitable for communication base station lead-acid and lithium battery hybrid use and control method thereof Download PDFInfo
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- CN114825398A CN114825398A CN202210054013.1A CN202210054013A CN114825398A CN 114825398 A CN114825398 A CN 114825398A CN 202210054013 A CN202210054013 A CN 202210054013A CN 114825398 A CN114825398 A CN 114825398A
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J7/00047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with provisions for charging different types of batteries
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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
- 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
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Abstract
The energy storage system suitable for the mixed use of the lead acid and the lithium battery of the communication base station comprises a commercial power supply, a switching power supply, communication equipment and a mixed use energy storage module of a new battery and an old battery. The new and old battery hybrid energy storage module comprises an intelligent control box, a lead-acid battery pack and a multi-lithium battery pack. The intelligent control box comprises a switch power supply access port, a voltage conversion circuit, a battery access port and a management unit. The battery access port is provided with a lead-acid interface and a lithium battery interface. The lead-acid interface and the lithium battery interface are respectively and independently arranged and are independently controlled by the management unit, so that the charging and discharging channels of the batteries are independently controlled, the common work of different battery packs can be realized, and the problems of circulation, bias current, voltage difference and the like among the batteries with different internal resistances are solved. According to local peak-valley time periods, different power supplies are used for supplying power in different time periods, so that the electric power is more reasonably utilized, and the overall working efficiency is improved.
Description
Technical Field
The invention relates to the technical field of communication base stations, in particular to an energy storage system applicable to the mixed use of lead acid and a lithium battery of a communication base station and a control method thereof.
Background
The communication base station is a public mobile communication base station, is an interface device for accessing the mobile equipment to the internet, and is a form of a radio station, and refers to a radio transceiver station for information transmission between a mobile communication switching center and a mobile telephone terminal in a certain radio coverage area. The communication base station equipment can be influenced by mains supply power failure or interruption, and in order to avoid the communication base station from generating faults due to the mains supply power failure, the storage battery becomes an important component in a power supply system of the communication base station.
The base station usually selects the lead-acid battery as the backup power supply of the communication base station, but the lead-acid battery has short service life, mainly because the lead-acid battery is frequently charged and discharged or because the lead-acid battery is not fully charged after being discharged and then is discharged again, the capacity of the lead-acid battery is cumulatively lost, and the service life of the lead-acid battery is short. Therefore, in the prior art, a lead-acid battery and a lithium battery are used in a mixed manner, and the defect of frequent charging and discharging of the lead-acid battery can be alleviated to a certain extent, for example, a battery mixed application system of a communication base station disclosed in patent No. CN 201520429295.4. But the new and old batteries are mixed under different states, and particularly the mixed use of the traditional lead-acid is faced. When the performances of the new battery and the old battery are inconsistent, circulation current and bias current are generated among the battery packs, the battery with small internal resistance bears large current, and the battery with large internal resistance bears small current, so that the capacity of the battery with small internal resistance is quickly attenuated, and the service life of the battery is shortened. The problems that discharging of different battery packs is difficult to schedule, excessive consumption of part of lithium battery packs is caused, or the lithium battery packs cannot supply power in a mains supply power-off state, and the power supply stability of a base station is poor are caused.
Disclosure of Invention
In view of the above, the present invention provides an energy storage system suitable for a communication base station and a lead-acid battery and a control method thereof, so as to solve the above technical problems.
The energy storage system comprises a mains supply, a switch power supply connected with the mains supply, communication equipment connected with the switch power supply, and an energy storage module for mixing a new battery and an old battery connected with the switch power supply. The switching power supply is used for detecting whether the commercial power is normal and converting the commercial power at the same time. New and old battery thoughtlessly uses energy storage module include one with the box is controlled to the intelligence that switching power supply connects, at least two with the lead-acid batteries group that the box is connected is controlled to the intelligence, and a plurality of with the lithium cell group that the box is connected is controlled to the intelligence. The intelligence is controlled the box including one with switching power supply that switching power supply connects inserts the mouth, one with the voltage transformation circuit that switching power supply inserted the mouth and connects, one with the battery that voltage transformation circuit connects inserts the mouth, and a control the administrative unit of intelligence accuse box. And the voltage converted by the switching power supply is input into the voltage conversion circuit through the switching power supply access port. The voltage conversion circuit is used for isolating and converting voltage, and the battery access port is provided with at least two lead-acid interfaces and a plurality of lithium battery interfaces. The two lead-acid interfaces are respectively connected with the two lead-acid battery packs, and the lithium battery interface is connected with the lithium battery pack. The lead-acid interface and the lithium battery interface are respectively and independently arranged and are independently controlled by the management unit. And a BMS management system is embedded in the lithium battery pack, and is used for collecting battery data and closing or opening an MOS according to the battery state.
Furthermore, two routes are arranged between the switch power supply access port and the switch power supply, wherein one route is a main route, and the other route is a standby route.
Further, the voltage conversion circuit is composed of a bidirectional DC-DC module, when the storage battery pack needs to be charged, the voltage input from the switch power supply access port is increased to be higher than the voltage of the battery pack, the total current is divided into multiple paths to flow to the battery pack, when the battery pack discharges, the voltage of the battery pack is raised to be higher than the output voltage of the switch power supply, the battery pack current is collected and then divided into two paths to flow back to the switch power supply, the voltage conversion circuit can also be composed of a unidirectional DC-DC module, voltage transformation is not performed during charging, and voltage transformation is performed during discharging.
Furthermore, the current of the lead-acid interface is 150A, the total current of the channels of the lithium battery interfaces is 1.5 times of the load current, the current of a single lithium battery interface is in a first level of 50A, and the working voltage range of the lithium battery pack is 44-56.5V.
Further, be applicable to the energy storage system that communication base station lead acid and lithium cell used with mixture can also switching power supply with increase an edge gateway between the box is controlled to the intelligence, edge gateway with switching power supply with the intelligence is controlled the box and is carried out RS485 agreement butt joint, through edge gateway realizes the instruction and issues whole energy storage system.
Further, the energy storage system who is applicable to communication base station lead-acid and lithium cell and uses jointly can also cancel lead acid interface will lead acid battery group hangs on switching power supply's female arranging to control to intelligent circuit breaker, intelligent circuit breaker with the intelligence is controlled the box and is carried out the butt joint of RS485 agreement, when the commercial power falls, by the intelligence is controlled the box and is told intelligent circuit breaker opens the switch, makes lead acid battery group discharges.
A control method of an energy storage system suitable for a lead acid and lithium battery mixed use of a communication base station comprises the following steps:
step S1: the intelligent control box sets a peak clipping and valley filling operation strategy according to local peak-valley time periods, the peak power price period corresponds to a peak clipping mode, the valley power price period corresponds to a valley filling mode, the flat power price period corresponds to a resting mode, the intelligent control box sets parameters such as output and input upper and lower limit voltages, a single-channel current limiting value and a minimum working channel, and the output voltage of the switching power supply is 53.5V and is in a constant voltage output mode;
step S2: the intelligent control box judges and starts a corresponding mode according to the time point and the received information;
step S3.1: when the mains supply is normal, the intelligent control box judges that the time is in a peak clipping mode according to the time point, the intelligent control box opens an output channel and an MOS (metal oxide semiconductor) of the lithium battery pack, so that the lithium battery pack discharges, the discharged currents of the multiple lithium battery packs are collected through the voltage conversion circuit, the output voltage is raised to 55V and then is output to the switching power supply in two ways, at the moment, the output voltage of the lithium battery pack is larger than the output voltage 53.5V of the switching power supply, the switching power supply stops outputting, and the lithium battery pack directly supplies power to a network load of the communication equipment;
step S3.2: when the mains supply is normal, the intelligent control box judges that the time is in a valley filling mode according to the time point and the lithium battery pack is not fully charged, the intelligent control box opens an input channel, the switching power supply outputs in two paths at the moment, one path supplies power to the communication equipment, the other path charges the lithium battery pack, the voltage conversion circuit collects the input current of the switching power supply and then distributes the current to each battery channel, and the batteries of each channel are charged;
step S3.3: when the mains supply is normal, the intelligent control box judges that the time is in a shelving mode according to the time point, the intelligent control box closes an input or output channel, the lithium battery pack does not work and is in a standing state, and the switching power supply only supplies power to the communication equipment;
step S3.4: when the switching power supply detects that the mains voltage is 0, the switching power supply sends out mains power failure information to the intelligent control box, the intelligent control box opens an output channel of the lead-acid battery pack, and the lead-acid battery pack is started to discharge and supplies power to the communication equipment;
step S3.5: because lead-acid battery group can output electric quantity just lead-acid battery group takes place the insufficient voltage because of self reason, works as the box detects is controlled to the intelligence when the voltage of lead-acid battery group is less than 50V and is not in the peak clipping mode time quantum, this moment the box is controlled to the intelligence and opens lead-acid battery group's input channel gives lead-acid battery group benefit electricity.
Further, in step S3.1, when the set peak clipping mode time reaches a point or the intelligent control box detects that the battery voltage is lower than the cut-off voltage, the intelligent control box closes the output channel and issues an instruction to the switching power supply, so that the lithium battery pack stops supplying power, and the switching power supply resumes operating at a constant voltage of 53.5V.
Further, in the step S3.2, when the voltage of the lithium battery pack is lower than 53.5V, the voltage change circuit does not change the voltage but only shunts the current, and when the voltage of the lithium battery pack is higher than 53.5V, the voltage change circuit changes the voltage, raises the input voltage, and shunts the input current to the battery for charging.
Further, in above-mentioned step S3.2, as single when lithium cell group is full of the electricity, BMS closes the MOS that charges, this moment intelligence accuse box notice switching power supply reduces corresponding output current, avoids floating the phenomenon of filling, works as switching power supply detects the load and appears great electric current suddenly and when exceeding the current limiting point, switching power supply informs intelligence accuse box and closes input channel, reduces switching power supply output.
Compared with the prior art, the energy storage system suitable for the communication base station lead-acid and lithium battery hybrid is provided with two lead-acid interfaces independently and used for power supplement and power failure standby of the lead-acid battery, after the mains supply is powered down, the system can quickly respond to the power on of the lead-acid battery pack to supply power to a network load, the response speed is less than or equal to 10ms, and the power supply after the mains supply is powered down is realized. The lead-acid interface and the lithium battery interface are respectively and independently arranged, the management unit independently sets parameters of each channel and independently controls each channel, so that the charging and discharging channels of the battery are independently controlled, the battery packs with different use degrees, different capacities and different brands can work together, and the problems of circulation, bias current, voltage difference and the like among batteries with different internal resistances are solved. Simultaneously according to local peak-valley time quantum, supply power by different power in the time quantum of difference, utilize the low-load of base station valley time quantum to charge the battery, the battery discharges when the high load of base station peak time quantum, more rationally utilizes electric power to improve whole work efficiency, design is more reasonable.
Drawings
Fig. 1 is a schematic structural diagram of an energy storage system suitable for a communication base station in which a lead acid and a lithium battery are used in a mixed manner.
Fig. 2 is a schematic structural diagram of an energy storage module used in combination with new and old batteries, which is provided in the energy storage system used in combination with lead-acid and lithium batteries in the communication base station in fig. 1.
Fig. 3 is a schematic structural diagram of an edge gateway added to the energy storage system suitable for a lead-acid and lithium battery hybrid use in the communication base station in fig. 1.
Fig. 4 is a schematic cross-sectional structure diagram of the energy storage system of fig. 1, which is suitable for a lead-acid and lithium battery hybrid communication base station and is added with an intelligent circuit breaker.
Fig. 5 is a flowchart of a control method of the energy storage system suitable for a lead-acid and lithium battery hybrid communication base station in fig. 1.
Detailed Description
Specific examples of the present invention will be described in further detail below. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.
Fig. 1 to fig. 5 are schematic structural diagrams of an energy storage system suitable for a lead-acid battery and a lithium battery of a communication base station according to the present invention. The energy storage system suitable for the lead-acid and lithium battery hybrid use of the communication base station comprises a mains supply 10, a switch power supply 20 connected with the mains supply 10, a communication device 30 connected with the switch power supply 20, and an energy storage module 40 for the new and old batteries connected with the switch power supply 20. It is understood that the energy storage system for a lead-acid battery and a lithium battery of a communication base station may further include other functional modules, such as circuit components, a control module, and the like, which are well known to those skilled in the art and will not be described herein again.
The utility power 10 is a power frequency Alternating Current (AC) and is mainly used for charging the communication device 30 and the new and old battery hybrid energy storage module 40. By introducing the commercial power of the AC380V, the commercial power 10 supplies power to domestic electricity such as air-conditioning lighting, and the AC380V is inverted into the DC48V by the conversion of the switching power supply 20, so as to supply power to the communication equipment 30 or charge the new and old battery hybrid energy storage module 40. The switching power supply 20 is configured to detect whether the commercial power 10 is normal, that is, detect whether the commercial power 10 suddenly has a large current or is powered off, and convert the commercial power 10 into DC48V to be used as a power supply source of the communication device 30 and a charging source of the energy storage module 40 for mixing new and old batteries.
The network load current of the communication equipment 30 in operation is 20-300A, the load current depends on the number of the communication equipment, and the whole direct current side equipment is output in a 48V nominal mode. A single communication device of the switching power supply 20 needs to meet a working voltage range of 44V-57V, because the voltage of the communication device after being loaded on the tower is not lower than 48V and the voltage drop of the communication device after being loaded on the tower is close to 2V, the effective working range of the communication device is 50V-57V, the lead-acid full-electricity voltage is 53.5V, in order to ensure that the output voltage of the switching power supply 20 and the lead-acid voltage are in a balanced state, namely the lead-acid full-electricity voltage is also the constant-voltage output voltage of the switching power supply 20, the switching power supply 20 has 0.5V voltage fluctuation during voltage regulation, and the range is 53V-54V.
The new and old battery hybrid energy storage module 40 comprises an intelligent control box 41 connected with the switching power supply 20, at least two lead-acid battery packs 42 connected with the intelligent control box 41, and a plurality of lithium battery packs 43 connected with the intelligent control box 41. The lithium battery pack 43 is used for peak clipping of the base station direct current side communication device, when the mains supply is in a peak time period, the lithium battery pack 43 supplies power, and when the mains supply is in a valley time period, the lithium battery pack 43 charges. When the commercial power is in the flat time period, the commercial power is directly supplied. When the commercial power alternating current point is 0, the lead-acid battery pack 42 supplies power. The intelligent control box 41 controls the switching of the lithium battery pack 43, the lead-acid battery pack 42 and a power supply system of the mains supply, data transmission and instruction issuing, and manages the common charging and discharging and the step-by-step charging and discharging of the batteries.
The intelligent control box 41 comprises a switch power supply access port 411 connected with the switch power supply 20, a voltage conversion circuit 412 connected with the switch power supply access port 411, a battery access port 413 connected with the voltage conversion circuit 412, and a management unit 414 for controlling the intelligent control box 41.
The warp voltage after switching power supply 20 contravariant passes through switching power supply access 411 inputs in the voltage conversion circuit 412, switching power supply access 411 with be equipped with two routes between the switching power supply 20, wherein be the main line all the way, another way is the reserve line, and when route all the way is impaired, the route on another way still can normally work, improves overall stability.
The voltage conversion circuit 412 is composed of a bi-directional DC-DC module and is used to isolate and convert voltages. When the battery pack needs to be charged, the voltage conversion circuit 412 increases the voltage input from the switching power supply inlet 411 to be higher than the voltage of the battery pack, and divides the total current into multiple paths to flow to the battery pack, thereby charging the battery pack. When the battery pack discharges, the voltage conversion circuit 412 raises the voltage of the battery pack to the output voltage of the switching power supply 20, and the battery pack current is collected and then flows back to the switching power supply 20 in two paths, so that the battery pack discharges to supply power for a network load. It is contemplated that the voltage conversion circuit 412 may be a unidirectional DC-DC module, which does not transform voltage during charging and transforms voltage during discharging.
The battery access port 413 is provided with at least two 150A lead acid interfaces 4131, and a plurality of lithium battery interfaces 4132.
The two lead-acid interfaces 4131 are used as lead-acid battery interfaces and are respectively connected with the two lead-acid battery packs 42 and used for power supplement and power backup of the lead-acid batteries during power failure. This lead-acid interface 4131 is normally closed when the lead-acid battery 42 is at full power. When the mains supply is powered off or supplemented, the lead-acid interface 4131 is in an open state. The number of the lead-acid interfaces 4131 is the same as that of the lead-acid battery packs 42, and two groups of 48500-48800 lead-acid battery packs are conventionally used in the base station, so that two paths of lead-acid interfaces are arranged. The lithium battery interface 4132 is connected with the lithium battery pack 43, the lithium battery interface 4132 is configured according to an actual load current of a communication base station, a total channel current of the lithium battery interface 4132 is 1.5 times of a load current, the current of a single lithium battery interface 4132 is in a first level of 50A, and if the load current of the base station is 50A, the number of the lithium battery interfaces 4132 is 2 and 50A; for another example, when the load current of the base station is 100A, the number of the lithium battery interfaces 4132 is 3 and 50A. The lithium battery pack 43 is embedded with a BMS management system, collects data such as a battery, voltage, current, capacity and the like, and closes or opens an MOS according to the state of the battery. The working voltage range of the lithium battery pack 43 is 44-56.5V.
The lead-acid interface 4131 and the lithium battery interface 4132 are independently provided, and the management unit 41 independently controls each channel. The management unit 414 communicates with the switching power supply inlet 411, the voltage conversion circuit 412, the battery inlet 413, and the BMS of the lithium battery pack through a CAN communication, and exchanges information such as a voltage compensation function, a battery voltage, a current, a temperature, an input current, an input/output voltage of a single channel, a channel open state, and the like. Management unit 414 with switching power supply 20 carries out the butt joint of RS485 agreement, realizes switching power supply 20 with intelligence accuse box 41's information interaction, switching power supply 20 will information transfer such as voltage and current, load, switching power supply output voltage of commercial power 10 gives intelligence accuse box 41, 41 intelligence accuse box also issues strategies such as peak clipping valley filling instruction, charge-discharge strategy to each module. The management unit 414 independently sets the peak clipping and valley filling strategies, the charging and discharging voltages, the charging and discharging current coefficients, the charging and discharging sequence, the battery overvoltage, undervoltage, overcurrent, overheating and other protection parameters of each channel, so that the charging and discharging channels of the battery are independently controlled, the battery packs with different use degrees, different capacities and different brands can work together, and the problems of circulation, bias current, voltage difference and the like among the batteries with different internal resistances are solved.
The energy storage system suitable for the mixed use of the lead-acid battery and the lithium battery of the communication base station is also suitable for the echelon lithium battery, and the same effect can be realized only by replacing the lead-acid battery pack 42 with the echelon lithium battery and arranging the lead-acid battery pack at the same position.
As shown in fig. 3, the energy storage system suitable for a lead-acid and lithium battery hybrid used in a communication base station may further include an edge gateway 44 between the switching power supply 20 and the intelligent control box 41. The edge gateway 44 with switching power supply 20 with the intelligence is controlled box 41 and is carried out RS485 agreement butt joint, realizes the information interaction, through edge gateway 44 realizes that the instruction is issued to whole energy storage system, and the operation such as parameter modification is filled out in the peak clipping, data upload, also can be fine controls.
As shown in fig. 4, the energy storage system suitable for the mixed use of the lead-acid and the lithium battery of the communication base station may further omit the lead-acid interface 4131, hang the lead-acid battery pack 42 on the busbar of the switching power supply 20, and connect to an intelligent circuit breaker 45 for control. The breaker of the intelligent breaker 45 is in a normally open state, so that the lead-acid battery pack 42 is in a static state at ordinary times. Intelligent circuit breaker 45 with box 41 is controlled to the intelligence carries out the butt joint of RS485 agreement, when the commercial power falls, by box 41 is controlled to the intelligence informs intelligent circuit breaker 45 opens the switch, makes lead acid battery group 42 discharges to also can supply power through lead acid battery when the commercial power outage. The intelligent circuit breaker 45 has a time control function, the switch is turned on every half month to supply electricity to the lead-acid, and the specific time can be set according to actual needs.
The invention also provides a control method of an energy storage system suitable for the mixed use of lead acid and lithium batteries of a communication base station, as shown in fig. 5, the method supplies power by different power supplies in different time periods according to local peak-valley time periods, and specifically comprises the following steps:
step S1: the intelligent control box 41 sets a peak clipping and valley filling operation strategy according to local peak-valley time periods, the peak clipping mode corresponds to the peak power price time period, the valley filling mode corresponds to the valley power price time period, and the shelving mode corresponds to the flat power price time period. The intelligent control box 41 sets output and input upper and lower limit voltages, a single-channel current limiting value and minimum working channel parameters, the output voltage of the switch power supply 20 is 53.5V and is in a constant voltage output mode.
Step S2: the switching power supply 20 detects whether the commercial power is normal and transmits information to the intelligent control box 41, and the intelligent control box 41 judges and starts a corresponding mode according to the time point and the received information.
Step S3.1: when the commercial power is normal, the box 41 is controlled according to the time point to judge that the time is in the peak clipping mode to the intelligence, the box 41 is controlled to the intelligence opens output channel just the MOS of lithium cell group 43 is opened, makes lithium cell group 43 discharge and pass through voltage transformation circuit 412 with the multichannel the electric current that lithium cell group 43 discharged is gathered the back, raises output voltage to 55V, then divide two tunnel to export switching power supply 20, this moment the output voltage of lithium cell group 43 is greater than switching power supply 20's output voltage 53.5V, switching power supply stop output, lithium cell group 43 directly gives the network load power supply of communication equipment 30.
Step S3.2: when the commercial power is normal, the box 41 is controlled to intelligence according to the time point judgement time in the mode of filling a valley just lithium cell group 45 when not fully utilizing, input channel is opened to box 41 is controlled to intelligence, this moment switching power supply 20 divides two tunnel outputs, gives communication equipment power supply all the way, gives all the way lithium cell group 43 charges. The voltage conversion circuit 412 collects the input current of the switching power supply and then shunts the collected current to each battery channel to charge the battery of each channel.
Step S3.3: when the commercial power is normal, the intelligent control box 41 judges that the time is in the mode of shelving according to the time point, the intelligent control box 41 closes the input or output channel, the lithium battery pack 43 does not work and is in the state of standing, the switching power supply 20 only supplies power to the communication equipment 30.
Step S3.4: when switching power supply 20 detects mains voltage and is 0, switching power supply 20 sends the commercial power and loses electric information and gives box 41 is controlled to the intelligence, box 41 is controlled to the intelligence and opens lead acid battery group 42's output channel, lead acid battery group 42 opens and discharges, gives communication equipment 30 supplies power.
Step S3.5: because lead-acid battery 42 output power just lead-acid battery 42 takes place the insufficient voltage because of self reason, works as intelligence is controlled box 41 and is detected when lead-acid battery 42's voltage is less than 50V and not be in the peak clipping mode time quantum, this moment intelligence is controlled box 41 and is opened lead-acid battery 42's input channel gives lead-acid battery 42 mends the electricity.
In the above step S3.1, when the set peak clipping mode time reaches a point or the intelligent control box 41 detects that the battery voltage is lower than the cut-off voltage, the intelligent control box 41 closes the output channel and issues an instruction to the switching power supply 20, so that the lithium battery pack 43 stops supplying power, and the switching power supply 20 resumes working and supplies power at a constant voltage of 53.5V.
In the step S3.1, when the redundancy of the battery configuration capacity of the lithium battery pack 43 is large, the intelligent control box 21 may open the output channels step by step, and when the battery voltage of one channel is lower than 50V, open another output channel, and the battery pack starts to discharge and close the low voltage channel.
In the step S3.2, when the voltage of the lithium battery pack 43 is lower than 53.5V, the voltage change circuit 412 does not change the voltage but only shunts the current, and when the voltage of the lithium battery pack 43 is higher than 53.5V, the voltage change circuit 412 changes the voltage and increases the input voltage and shunts the input current to the battery for charging.
In above-mentioned step S3.2, as single when lithium cell group 43 is full of the electricity, BMS closes the MOS that charges, this moment intelligence is controlled box 41 and is informed switching power supply 20 reduces corresponding output current, avoids floating the phenomenon of filling, works as switching power supply 20 detects the load and appears great electric current suddenly and when exceeding the current limiting point, switching power supply informs intelligence and controls the box and close input channel, reduces switching power supply output.
Compared with the prior art, the energy storage system suitable for the communication base station lead-acid and lithium battery hybrid is provided with two lead-acid interfaces 4131 independently and is used for power supplement and power failure standby of the lead-acid battery, after mains supply power failure, the system can quickly respond to open the lead-acid battery pack and supply power to network loads, the response speed is less than or equal to 10ms, and power supply after mains supply power failure is realized. The lead-acid interface 4131 and the lithium battery interface 4132 are respectively and independently arranged, the management unit 414 independently sets parameters of each channel, and the management unit 41 independently controls each channel, so that the charge and discharge channels of the battery are independently controlled, the battery packs with different use degrees, different capacities and different brands can work together, and the problems of circulation, bias current, voltage difference and the like among the batteries with different internal resistances are solved. Simultaneously according to local peak-valley time quantum, supply power by different power in the time quantum of difference, utilize the low-load of base station valley time quantum to charge the battery, the battery discharges when the high load of base station peak time quantum, more rationally utilizes electric power to improve whole work efficiency, design is more reasonable.
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 scope of the present invention, and any modifications, equivalents or improvements that are within the spirit of the present invention are intended to be covered by the following claims.
Claims (10)
1. The utility model provides an energy storage system suitable for communication base station lead acid and lithium cell are used with mixedly which characterized in that: the energy storage system suitable for communication base station lead acid and lithium cell are used together includes the commercial power, one with mains connection's switching power supply, one with switching power supply connects's communications facilities, and one with new and old battery that switching power supply connects uses energy storage module in mixture, switching power supply is used for detecting whether the commercial power is normal simultaneous conversion the commercial power, new and old battery use energy storage module in mixture include one with switching power supply connects's intelligence accuse box, at least two with the lead acid battery group that the intelligence accuse box is connected to and a plurality of with the lithium cell group that the intelligence accuse box is connected, intelligence accuse box include one with switching power supply access port that switching power supply connects, one with the voltage transformation circuit that switching power supply access port is connected, one with the battery access port that voltage transformation circuit connects, and one control the management unit of intelligence accuse box, the battery management system comprises a switching power supply, a voltage conversion circuit, a battery access port, a plurality of lithium battery interfaces, a BMS management system and a management unit, wherein the voltage converted by the switching power supply is input into the voltage conversion circuit through the switching power supply access port, the voltage conversion circuit is used for isolating and converting the voltage, the battery access port is provided with at least two lead-acid interfaces and a plurality of lithium battery interfaces, the two lead-acid interfaces are respectively connected with two lead-acid battery packs, the lithium battery interfaces are connected with the lithium battery pack, the lead-acid interfaces and the lithium battery interfaces are respectively and independently arranged and are independently controlled by the management unit, and the lithium battery pack is embedded with the BMS management system and used for collecting battery data and closing or opening an MOS according to the battery state.
2. The energy storage system suitable for the lead-acid battery and lithium battery of the communication base station as claimed in claim 1, wherein: two routes are arranged between the switch power supply access port and the switch power supply, wherein one route is a main route, and the other route is a standby route.
3. The energy storage system suitable for the mixed use of the lead-acid battery and the lithium battery of the communication base station as claimed in claim 1, wherein: the voltage conversion circuit is composed of a bidirectional DC-DC module, when the storage battery pack needs to be charged, the voltage input from the switch power supply access port is increased to be higher than the voltage of the battery pack, the total current is divided into multiple paths to flow to the battery pack, when the battery pack discharges, the voltage of the battery pack is raised to be higher than the output voltage of the switch power supply, the battery pack current is converged and then divided into two paths to flow back to the switch power supply, the voltage conversion circuit can also be composed of a unidirectional DC-DC module, voltage transformation is not performed during charging, and voltage transformation is performed during discharging.
4. The energy storage system suitable for the lead-acid battery and lithium battery of the communication base station as claimed in claim 1, wherein: the current of the lead-acid interface is 150A, the total current of the channels of the lithium battery interfaces is 1.5 times of the load current, the current of a single lithium battery interface is 50A, and the working voltage range of the lithium battery pack is 44-56.5V.
5. The energy storage system suitable for the lead-acid battery and lithium battery of the communication base station as claimed in claim 1, wherein: the energy storage system who is applicable to communication base station lead acid and lithium cell and uses can also switching power supply with increase an edge gateway between the box is controlled to the intelligence, edge gateway with switching power supply with the intelligence is controlled the box and is carried out RS485 agreement butt joint, through edge gateway realizes the instruction and issues whole energy storage system.
6. The energy storage system suitable for the mixed use of the lead-acid battery and the lithium battery of the communication base station as claimed in claim 1, wherein: energy storage system suitable for communication base station lead-acid and lithium cell use thoughtlessly can also cancel lead acid interface will lead acid battery group hangs on switching power supply's female arranging to control to intelligent circuit breaker, intelligent circuit breaker with the intelligence is controlled the box and is carried out RS485 agreement butt joint, when the commercial power falls, by the intelligence is controlled the box and is told intelligent circuit breaker opens the switch, makes lead acid battery group discharges.
7. A control method of an energy storage system suitable for a lead-acid and lithium battery of a communication base station as claimed in any one of claims 1 to 6, comprising the steps of:
step S1: the intelligent control box sets a peak clipping and valley filling operation strategy according to local peak-valley time periods, the peak power price period corresponds to a peak clipping mode, the valley power price period corresponds to a valley filling mode, the flat power price period corresponds to a resting mode, the intelligent control box sets parameters such as output and input upper and lower limit voltages, a single-channel current limiting value and a minimum working channel, and the output voltage of the switching power supply is 53.5V and is in a constant voltage output mode;
step S2: the intelligent control box judges and starts a corresponding mode according to the time point and the received information;
step S3.1: when the mains supply is normal, the intelligent control box judges that the time is in a peak clipping mode according to the time point, the intelligent control box opens an output channel and an MOS (metal oxide semiconductor) of the lithium battery pack, so that the lithium battery pack discharges, the discharged currents of the multiple lithium battery packs are collected through the voltage conversion circuit, the output voltage is raised to 55V and then is output to the switching power supply in two ways, at the moment, the output voltage of the lithium battery pack is larger than the output voltage 53.5V of the switching power supply, the switching power supply stops outputting, and the lithium battery pack directly supplies power to a network load of the communication equipment;
step S3.2: when the mains supply is normal, the intelligent control box judges that the time is in a valley filling mode according to the time point and the lithium battery pack is not fully charged, the intelligent control box opens an input channel, the switching power supply outputs in two paths at the moment, one path supplies power to the communication equipment, the other path charges the lithium battery pack, the voltage conversion circuit collects the input current of the switching power supply and then distributes the current to each battery channel, and the batteries of each channel are charged;
step S3.3: when the mains supply is normal, the intelligent control box judges that the time is in a shelving mode according to the time point, the intelligent control box closes an input or output channel, the lithium battery pack does not work and is in a standing state, and the switching power supply only supplies power to the communication equipment;
step S3.4: when the switching power supply detects that the mains voltage is 0, the switching power supply sends out mains power failure information to the intelligent control box, the intelligent control box opens an output channel of the lead-acid battery pack, and the lead-acid battery pack is started to discharge and supplies power to the communication equipment;
step S3.5: because lead-acid battery group can output electric quantity just lead-acid battery group takes place the insufficient voltage because of self reason, works as the box detects is controlled to the intelligence when the voltage of lead-acid battery group is less than 50V and is not in the peak clipping mode time quantum, this moment the box is controlled to the intelligence and opens lead-acid battery group's input channel gives lead-acid battery group benefit electricity.
8. The method according to claim 7, wherein the method comprises the following steps: in above-mentioned step S3.1, after the peak clipping mode time that sets up arrived a little or when the box detected that battery voltage is less than cutoff voltage is controlled to the intelligence, the box was controlled to the intelligence closes output channel and issues the instruction and give switching power supply makes the lithium cell group stops the power supply, just switching power supply resume work is supplied power with constant voltage 53.5V.
9. The method according to claim 7, wherein the method comprises the following steps: in the step S3.2, when the voltage of the lithium battery pack is lower than 53.5V, the voltage change circuit does not change the voltage but only shunts the current, and when the voltage of the lithium battery pack is higher than 53.5V, the voltage change circuit changes the voltage and shunts the input current to the battery for charging after raising the input voltage.
10. The method according to claim 7, wherein the method comprises the following steps: in above-mentioned step S3.2, as single when lithium cell group is full of the electricity, BMS closes the MOS that charges, this moment intelligence accuse box notice switching power supply reduces corresponding output current, avoids floating the phenomenon of filling, works as switching power supply detects the load and appears great electric current suddenly and when surpassing the current limiting point, switching power supply informs intelligence accuse box and closes input channel, reduces switching power supply output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210054013.1A CN114825398A (en) | 2022-01-18 | 2022-01-18 | Energy storage system suitable for communication base station lead-acid and lithium battery hybrid use and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115313612A (en) * | 2022-08-11 | 2022-11-08 | 山东聊开电气有限公司 | 48V direct current storage integrated power supply system, and charge and discharge control method and application thereof |
| CN115579988A (en) * | 2022-10-27 | 2023-01-06 | 重庆瑞盾科技发展有限公司 | Base station battery intelligent management system and method |
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2022
- 2022-01-18 CN CN202210054013.1A patent/CN114825398A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115313612A (en) * | 2022-08-11 | 2022-11-08 | 山东聊开电气有限公司 | 48V direct current storage integrated power supply system, and charge and discharge control method and application thereof |
| CN115313612B (en) * | 2022-08-11 | 2024-04-26 | 山东聊开电气有限公司 | 48V direct current reserve integrated power supply system, and charging and discharging control method and application thereof |
| CN115579988A (en) * | 2022-10-27 | 2023-01-06 | 重庆瑞盾科技发展有限公司 | Base station battery intelligent management system and method |
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