CN108242842B - Management device and method for parallel connection of different types of storage battery packs - Google Patents
Management device and method for parallel connection of different types of storage battery packs Download PDFInfo
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- CN108242842B CN108242842B CN201611218703.7A CN201611218703A CN108242842B CN 108242842 B CN108242842 B CN 108242842B CN 201611218703 A CN201611218703 A CN 201611218703A CN 108242842 B CN108242842 B CN 108242842B
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- H02J7/0003—
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H02J7/0021—
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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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 invention discloses a management device and a method for parallel connection of different types of storage battery packs, wherein the management device comprises a monitoring module, a charging management unit, a discharging management unit, a direct current distribution unit and an alternating current distribution unit; the device is respectively connected with a mains supply input, at least two groups of storage batteries connected in parallel and a power environment monitoring host; the commercial power input supplies power to the charging management unit through the alternating current distribution unit; the charging management unit sequentially charges a plurality of groups of storage batteries in turn through the direct current power distribution unit and the switch circuit; the discharging management unit is connected with the direct current power distribution unit and manages simultaneous discharging of the storage batteries to the load circuit by sequentially controlling the direct current power distribution unit and the switch circuit; the switching circuit is configured for switching between a load circuit and a charge management unit. The parallel use of a plurality of groups of storage battery packs with different types, different capacities and different old and new degrees is realized.
Description
Technical Field
The invention belongs to the technical field of storage batteries, and particularly relates to a management device and a management method for parallel connection of different types of storage battery packs.
Background
With the development of modern mobile communication technology, the construction of communication base stations is more and more extensive, and a storage battery is used as a common backup power supply and becomes an important component of a power supply system of the communication base stations, so that the storage battery plays a significant role in the construction of the power supply system of the communication base stations. The storage battery is used as a power source and has wide application in the field of communication power sources. At present, most of the use conditions are that each independent communication power supply system is generally provided with at least two groups of storage batteries so as to improve the safety of power supply of the storage batteries and prevent the communication interruption accident caused by the damage (such as open circuit) of one group of storage batteries.
The cost of the battery in the communication power supply system is quite high, and accounts for almost half of the whole communication power supply system. Under the condition of not increasing the voltage of the storage batteries, if the continuous discharge time of the storage batteries is prolonged, the storage batteries are preferably used in parallel. However, the service life of the storage battery is far shorter than that of a switching power supply and a power distribution cabinet, and particularly, the average service life of the second-class battery for the communication base station is only about 4 years. Research shows that the factors causing the service life of the storage batteries are factors such as environmental temperature, the magnitude and the duration of charging current, and the like, and the parallel use of the storage batteries is also an important factor. Because the storage battery pack is formed by connecting a plurality of single storage batteries in series, each single battery has slight difference, and thus the internal resistance and the voltage of each group of storage batteries have certain difference. If only one or a few lagging batteries appear in one group of storage batteries, the other group of storage batteries can charge the other group of storage batteries in a non-current-limiting manner, and the whole group of batteries can be damaged easily.
Therefore, when multiple sets of storage batteries are connected in parallel, in order to reduce the nonuniformity caused by the difference between the single batteries as much as possible, the storage batteries are required to be consistent in type when the storage battery pack is configured: the capacity of the storage batteries is consistent, the new and old degrees are consistent, and the manufacturers and models, the production time and the batch numbers are consistent as much as possible. The causticity is to prevent the whole storage battery pack from being adversely affected by individual differences of the storage batteries, if the individual differences are overlarge, the storage battery packs are unbalanced, and the storage batteries can be damaged after a long time of charging and discharging. Therefore, under the existing conditions, the storage batteries are directly connected in parallel for use, so that a plurality of limiting conditions exist, and the storage batteries of the same manufacturer, the same model and the same batch can be connected in parallel for use.
In practical use, in order to realize electrical isolation during charging and discharging of the parallel storage battery packs, the isolation between the parallel storage battery packs equipped in the communication base station is usually only mechanically isolated through a fuse (or a switch), once the fuse (or the switch) is closed, the storage batteries of each group are completely communicated on a circuit, and the electrical isolation between the storage battery packs is not really realized; therefore, the storage batteries of all groups are in a direct connection relationship, and the currents can flow into each other. There is no electrical isolation between the battery packs in the line state. If a problem occurs in a single cell in the battery pack, the problem can be solved only by manually cutting off the connection after the problem is found, but the damage to the whole battery pack is probably caused, and the time is late. During the parallel use of the storage batteries, if one group of the storage batteries is found to be damaged, all the storage batteries must be replaced to solve the problem.
Disclosure of Invention
In order to overcome the defects of the prior art and overcome the problem that a plurality of groups of storage batteries with different types, capacities, models, manufacturers and new and old degrees cannot be used in parallel in the prior art, the device and the method for managing the storage batteries with different types in parallel are provided, the storage batteries with different capacities, models, manufacturers and new and old degrees among the storage batteries with the same type can be effectively used in parallel, the storage batteries with different capacities, models, manufacturers and new and old degrees among the storage batteries with different types can be used in parallel, and the original performance and efficiency of each group of storage batteries can not be influenced in the parallel use process of the storage batteries.
In order to achieve the purpose, the invention adopts a first technical scheme that:
a management device for different types of storage battery packs connected in parallel comprises a monitoring module, a charging management unit, a discharging management unit, a direct current distribution unit and an alternating current distribution unit; the device is respectively connected with a mains supply input, at least two groups of storage batteries connected in parallel and a power environment monitoring host;
the commercial power input is sequentially connected with the alternating current power distribution unit and the charging management unit, and the commercial power input supplies power to the charging management unit through the alternating current power distribution unit; the charging management unit is connected with the direct current power distribution unit, the direct current power distribution unit sequentially charges a plurality of groups of storage batteries in turn through a switch circuit, and the charging management unit is connected with the monitoring module;
the monitoring module is respectively connected with the direct current power distribution unit, the charging management unit, the discharging management unit and the power environment monitoring host;
the discharging management unit is connected with the direct current power distribution unit and manages simultaneous discharging of the storage batteries to the load circuit by sequentially controlling the direct current power distribution unit and the switch circuit; the parallel storage batteries are respectively connected with the charging management unit, the load circuit and the discharging management unit through the switch circuit, the direct current distribution unit and the charging management unit which are sequentially connected, and the switch circuit is configured to be used for switching between the load circuit and the charging management unit.
Furthermore, the alternating current power distribution unit adopts an alternating current wiring terminal, and mains supply input is input through the alternating current wiring terminal to supply power to the charging management unit; the direct current distribution unit adopts direct current binding post, is equipped with multichannel battery input circuit, monitoring module power input circuit all the way, direct current load output circuit all the way and the management unit circuit that discharges all the way, multichannel battery input circuit is the charging management unit respectively with the connecting circuit of multiunit battery, direct current load output circuit is the connecting circuit of load circuit and multiunit battery all the way.
Furthermore, the charging management unit comprises an EMI suppression circuit, a surge suppression circuit, an input rectification circuit, a PFC circuit, a full-bridge conversion circuit and an output rectification filter circuit, and 220V alternating current input by mains supply sequentially passes through the EMI suppression circuit, the surge suppression circuit, the input rectification circuit, the PFC circuit, the full-bridge conversion circuit and the output rectification filter circuit, is connected to the direct current distribution unit after being converted into direct current with suitable voltage.
Furthermore, the charging management unit comprises an input signal acquisition circuit, a PFC control circuit, a full-bridge conversion control circuit, a first control unit and a first communication module, wherein the input end of the input signal acquisition circuit is arranged between the surge suppression circuit and the input rectification circuit to acquire an input signal, and the output end of the input signal acquisition circuit is connected with the first control unit; the PFC circuit is connected to the first control unit through the PFC control circuit, the full-bridge conversion circuit and the output rectification filter circuit are respectively connected with the first control unit through the full-bridge conversion control circuit, the first control unit is connected with the first communication module, and the charging management unit is communicated with the monitoring module through the first communication module.
Further, the switching circuit adopts an MOSFET to realize the switching between the load circuit and the charging management unit, where the storage battery is connected with the load circuit through the dc power distribution unit.
Furthermore, the discharge management unit comprises a second control unit, a module address bit detection circuit, a dry contact point alarm signal output circuit, a status indicator lamp, a second communication module, a first auxiliary power supply module, a MOSFET drive circuit, a temperature detection circuit, a storage battery charging and discharging current detection circuit, a storage battery voltage detection circuit, a storage battery short circuit and overdischarge protection circuit and a non-circulation control circuit, the second control unit is respectively connected with the module address bit detection circuit, the main contact point alarm signal output circuit, the state indicator lamp, the second communication module, the first auxiliary power supply module, the MOSFET drive circuit, the temperature detection circuit, the storage battery charging and discharging current detection circuit, the storage battery voltage detection circuit, the storage battery short circuit and overdischarge protection circuit and the non-circulation control circuit, and the discharging management unit is connected with the monitoring module through the second communication module.
Furthermore, the monitoring module comprises a third control unit, a peripheral circuit, a third communication module, a fourth communication module, a fifth communication module, a second auxiliary power module, a clock circuit, a key module and a display module, wherein the third control unit is respectively connected with the peripheral circuit, the third communication module, the fourth communication module, the fifth communication module, the second auxiliary power module, the clock circuit, the key module and the display module;
the monitoring module is communicated with the first communication module through the third communication module, the monitoring module is communicated with the first communication module through the third communication module to acquire voltage and current output by the charging management unit, a charging management unit on-off signal and a fault protection signal, and the monitoring module is communicated with the first communication module through the second communication module to control the charging management unit to limit current so as to realize constant current uniform charging, constant voltage uniform charging and floating charging and realize charging requirements of different batteries;
the monitoring module is communicated with the second communication module through the fourth communication module, acquires information such as voltage, charging and discharging current, temperature and the like of the storage battery through the communication between the fourth communication module and the second communication module, sends an instruction to the discharging management unit through the logic analysis of the third control unit, controls the discharging management unit to control the storage battery through the direct current power distribution module and the switch circuit, and ensures that no circulation and performance influence is generated between the storage batteries connected in parallel;
the monitoring module is communicated with the environment power monitoring host through the fifth communication module and uploads an alarm signal to the environment power monitoring host. The fifth communication module comprises a 485 communication interface, and the monitoring module is communicated with the power environment monitoring host through the 485 communication interface, so that the power environment monitoring host can remotely monitor the whole device.
Furthermore, the peripheral circuit comprises a crystal oscillator circuit, a reset circuit, a filter circuit and a JTAG circuit, and the first control unit is respectively connected with the crystal oscillator circuit, the reset circuit, the filter circuit and the JTAG circuit.
Furthermore, the display module comprises an LCD display screen and an audible and visual alarm module, the LCD display screen receives and displays the information transmitted by the first control unit, and the audible and visual alarm module receives the alarm information transmitted by the first control unit and performs audible and visual alarm.
In order to achieve the purpose, the invention adopts a second technical scheme that:
a management method for parallel connection of different types of storage battery packs comprises the following steps:
(1): judging whether the storage battery pack needs to be charged or discharged, and entering the step (2) if the storage battery pack needs to be charged; if discharging is needed, entering the step (3);
(2): a group of storage batteries needing to be charged is disconnected with a load circuit through a switch circuit and is connected to the charging management unit; if the multiple groups of storage batteries need to be charged, the multiple groups of storage batteries are alternately connected to the charging management unit through the switch circuit to be charged;
(3): the multiple groups of storage batteries are disconnected with the charged storage batteries through the switch circuit and connected to the load circuit, and the multiple groups of storage batteries are connected in parallel to discharge.
Further, when a plurality of groups of storage batteries in the step (2) need to be charged, charging management is carried out according to the priority of the storage battery pack, and charging is carried out in a grouping mode according to the priority.
Further, when the plurality of groups of storage batteries are discharged in parallel in the step (3), the discharge management unit distributes discharge current according to the external discharge capacity of each storage battery group, so that each storage battery group performs balanced discharge.
Furthermore, the storage battery pack in the step (2) or the step (3) needs capacity expansion, and a group of storage battery packs with proper capacity is added in parallel on the basis of the original storage battery pack.
Due to the adoption of the technology, compared with the prior art, the invention has the positive and beneficial effects that:
1. the management device and the method for the parallel connection of the different types of storage batteries realize the functions of mutual parallel connection use and alternate charging of a plurality of groups of different storage batteries through the MOSFET switch circuit, the charging management unit, the discharging management unit, the monitoring module, the direct current distribution unit and the alternating current distribution unit, solve the problem of limitation of the parallel connection use of the original storage batteries and provide convenient conditions for purchasing and selecting communication storage batteries.
2. The management device and the method for the parallel connection of the storage batteries of different types can realize the capacity expansion of the storage battery needing to prolong the guarantee time of the backup power supply by selecting and adding a group of storage batteries with proper capacity, replace the situation that the original storage battery is completely replaced, and save a large amount of cost for the capacity expansion of the storage battery.
3. The management device and the method for the parallel connection of the different types of storage batteries realize the balanced discharge of the storage batteries of each group through the control of the discharge management unit on the storage batteries of each group, the charge management unit carries out matched charge current according to the rated capacity of the different storage batteries, and the storage batteries of each group are charged according to priority alternate current, so that the old use of the storage batteries which cannot meet the contract signing time in the prior art is realized, the utilization rate of the storage batteries is improved, and the cost is saved.
4. The management device and the method for the parallel connection of the different types of storage battery packs realize that the originally planned one-time input large-capacity storage battery pack is changed into a plurality of groups of small-capacity storage battery packs, realize the standardized configuration of the storage battery packs and save the one-time input cost.
5. The management device and the method for the parallel connection of the storage battery packs of different types realize the small capacity of the storage battery packs, and the small capacity storage battery packs are arranged in a building block manner, so that the occupied area is saved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a charging management unit according to the present invention;
the system comprises a power supply input unit 1, an alternating current power distribution unit 2, a charging management unit 3, a discharging management unit 4, a monitoring unit 5, a direct current power distribution unit 6, a storage battery 7, a dynamic environment monitoring host computer 8, an EMI suppression circuit 9, a surge suppression circuit 10, an input rectification circuit 11, a PFC circuit 12, a full-bridge conversion circuit 13, an output rectification filter circuit 14, an input signal acquisition circuit 15, a PFC control circuit 16, a full-bridge conversion control circuit 17, a first control unit 18 and a first communication module 19.
Detailed Description
The invention is further described with reference to the following figures and examples.
Example 1:
a management device for different types of storage battery packs connected in parallel is shown in figure 1, and comprises a monitoring module 5, a charging management unit 3, a discharging management unit 4, a direct current distribution unit 6 and an alternating current distribution unit 2; the device is respectively connected with a mains supply input 1, at least two groups of parallel storage batteries 7 and a dynamic environment monitoring host 8;
the commercial power input 1 is sequentially connected with the alternating current distribution unit 2 and the charging management unit 3, and the commercial power input 1 supplies power to the charging management unit 3 through the alternating current distribution unit 2; the charging management unit 3 is connected with the direct current distribution unit 6, the direct current distribution unit 6 sequentially charges a plurality of groups of storage batteries 7 in turn through a switch circuit, and the charging management unit 3 is connected with the monitoring module 5;
the monitoring module 5 is respectively connected with the direct current power distribution unit 6, the charging management unit 3, the discharging management unit 4 and the dynamic environment monitoring host 8;
the discharge management unit 4 is connected with the direct current power distribution unit 6, and the discharge management unit 4 manages simultaneous discharge of a plurality of groups of storage batteries 7 to a load circuit by sequentially controlling the direct current power distribution unit 6 and a switch circuit; the storage batteries 7 connected in parallel are respectively connected with the charging management unit 3, the load circuit and the discharging management unit 4 through a switch circuit, the direct current distribution unit 6 and the charging management unit 3, the switch circuit is configured to be used for switching between the load circuit and the charging management unit 3.
The alternating current power distribution unit 2 adopts an alternating current wiring terminal, and a mains supply input 1 is input to the charging management unit through the alternating current wiring terminal to supply power; direct current distribution unit 6 adopts direct current binding post, is equipped with multichannel battery input circuit, monitoring module power input circuit all the way, direct current load output circuit all the way and the management unit circuit that discharges all the way, multichannel battery input circuit is charging management unit 3 respectively with the connecting circuit of multiunit battery 7, direct current load output circuit all the way is load circuit and multiunit battery 7's connecting circuit.
As shown in fig. 2, the charging management unit 3 includes an EMI suppression circuit 9, a surge suppression circuit 10, an input rectification circuit 11, a PFC circuit 12, a full-bridge conversion circuit 13, and an output rectification filter circuit 14, and the 220V ac power input by the utility power passes through the EMI suppression circuit 9, the surge suppression circuit 10, the input rectification circuit 11, the PFC circuit 12, the full-bridge conversion circuit 13, and the output rectification filter circuit 14 in sequence, and is connected to the dc power distribution unit 6 after being converted into dc power with a suitable voltage.
The charging management unit 3 comprises an input signal acquisition circuit 15, a PFC control circuit 16, a full-bridge conversion control circuit 17, a first control unit 18 and a first communication module 19, wherein an input end of the input signal acquisition circuit 15 is arranged between the surge suppression circuit 10 and the input rectification circuit 11 to acquire an input signal, and an output end of the input signal acquisition circuit 15 is connected with the first control unit 18; the PFC circuit 12 is connected to the first control unit 18 through the PFC control circuit 16, the full-bridge conversion circuit 13 and the output rectification filter circuit 14 are respectively connected to the first control unit 18 through the full-bridge conversion control circuit 17, the first control unit 18 is connected to the first communication module 19, and the charging management unit 3 communicates with the monitoring module 5 through the first communication module 19.
The input signal is connected to the control chip of the PFC circuit through the EMI suppression circuit, the surge suppression circuit and the input signal acquisition circuit respectively, the PFC circuit is connected to the control chip of the PFC circuit through the PFC control circuit, and the full-bridge conversion circuit and the output rectification filter circuit are connected to the control chip of the full-bridge conversion circuit through the full-bridge conversion control circuit respectively. The charging management unit 3 is a modular high-frequency switching power supply for converting 220V alternating current into 48V50A direct current. When commercial power is available, the charging management unit 3 charges the multiple storage batteries 7 in turn, a group of storage batteries 7 to be charged realize the disconnection of a load circuit and the connection to a charging circuit through an MOSFET, and the rest storage batteries 7 still connect to the load circuit and respond to the normal load after the commercial power is cut off all the time. The storage batteries are discharged in parallel when being discharged, one of the storage batteries is disconnected with a load when being charged, and the storage batteries are connected to a charging management unit for charging, and after being charged, the storage batteries are charged one by one, and only one storage battery can be charged at a time.
The switching circuit adopts MOSFET to realize the switching of the storage battery 7 and the charging management unit 3 through the load circuit connected with the direct current distribution unit 6.
The discharge management unit 4 comprises a second control unit, a module address bit detection circuit, a dry contact point alarm signal output circuit, a state indicator lamp, a second communication module, a first auxiliary power supply module, an MOSFET drive circuit, a temperature detection circuit, a storage battery charging and discharging current detection circuit, a storage battery voltage detection circuit, a storage battery short circuit and overdischarge protection circuit and a non-circulation control circuit, the second control unit is respectively connected with the module address bit detection circuit, the dry contact point alarm signal output circuit, the state indicator lamp, the second communication module, the first auxiliary power supply module, the MOSFET drive circuit, the temperature detection circuit, the storage battery charging and discharging current detection circuit, the storage battery voltage detection circuit, the storage battery short circuit and over-discharge protection circuit and the non-circulation control circuit, the discharge management unit 4 is connected with the monitoring module 5 through the second communication module.
The module address bit detection circuit is used for detecting the address of the module, and when the module address bit detection circuit is used, the discharge management unit can reply information when the monitoring module requests the information; when the monitoring module communicates with the discharge management unit, the monitoring needs to send the address of the discharge management unit to match the discharge management unit, and the discharge management unit can reply the information of the monitoring module only when finding that the address sent by the monitoring module is the address of the discharge management unit.
The second control unit adopts an ultra-low power consumption singlechip circuit, when the storage batteries 7 with different voltages are connected in parallel, the MOSFET is controlled by the MOSFET drive circuit to realize that the storage batteries are connected in parallel with a load, the storage batteries 7 can only discharge in a unidirectional conduction mode, and the non-circulation control circuit realizes that the storage batteries 7 have no circulation. Through state quantities such as temperature detection circuit, battery charge-discharge current detection circuit, battery voltage detection circuit gather battery present state charge-discharge current, voltage, temperature to the transmission it the second control unit, the second control unit sends corresponding instruction finally and passes through MOSFET drive circuit drive MOSFET through the above state information of logic analysis, lets well battery of battery sharing management system when needs charge, the battery all can charge and can not discharge, when the battery needs discharge, affiliated battery can only discharge and can not charge. This allows no circulation between the cells.
The storage battery short circuit and overdischarge protection circuit realizes the short circuit protection and the overdischarge protection of the storage battery 7. The single chip microcomputer circuit comprehensively analyzes the temperature of the storage battery 7 and the temperature of the MOSFET and controls the MOSFET to realize the over-temperature protection of the storage battery 7 and the power element.
The main contact alarm signal only has 2 high and low level signals. In this embodiment, the low level is defined as no alarm, and the high level is defined as alarm generation. And the main contact signals of the discharge management unit are uploaded to an IO port of the single chip microcomputer of the monitoring module and used for uploading alarm information when important alarm occurs so as to rapidly take protection action. The uploading of the alarm is slow in a common communication mode, the uploading of the dry contact alarm signal to the IO port of the single chip microcomputer is fast, and after the discharge management unit obtains the alarm signal, the MOSFET can be cut off quickly through the MOSFET driving circuit to protect the operation of the battery, so that the response is fast; and a dry contact point alarm signal of the monitoring module is uploaded to the power environment monitoring host through the fifth communication module.
The monitoring module 5 comprises a third control unit, a peripheral circuit, a third communication module, a fourth communication module, a fifth communication module, a second auxiliary power module, a clock circuit, a key module and a display module, wherein the third control unit is respectively connected with the peripheral circuit, the third communication module, the fourth communication module, the fifth communication module, the second auxiliary power module, the clock circuit, the key module and the display module;
the monitoring module 5 is communicated with the first communication module of the charging point module 3 through the third communication module, the monitoring module is communicated with the first communication module through the third communication module to acquire voltage and current output by the charging management unit, a charging management unit on-off signal and a fault protection signal, and the monitoring module is communicated with the first communication module through the second communication module to control the charging management unit to limit current so as to realize constant current uniform charging, constant voltage uniform charging and floating charging and realize charging requirements of different batteries;
the monitoring module 5 is communicated with the second communication module of the discharge management unit 4 through the fourth communication module, the monitoring module 5 is communicated with the second communication module through the fourth communication module to acquire information such as voltage, charge-discharge current, temperature and the like of the storage battery, and sends a command to the discharge management unit through the logic analysis of the third control unit to control the discharge management unit to control the storage battery through the direct current power distribution module and the switch circuit, so that no circulation and performance influence are generated between the storage batteries connected in parallel;
the monitoring module 5 is communicated with the environment power monitoring host 8 through the fifth communication module, and uploads an alarm signal to the environment power monitoring host 8.
The peripheral circuit comprises a crystal oscillator circuit, a reset circuit, a filter circuit and a JTAG circuit, and the first control unit is respectively connected with the crystal oscillator circuit, the reset circuit, the filter circuit and the JTAG circuit.
The display module comprises an LCD display screen and an audible and visual alarm module, the LCD display screen receives and displays the information transmitted by the first control unit, and the audible and visual alarm module receives the alarm information transmitted by the first control unit and performs audible and visual alarm.
A management method for parallel connection of different types of storage battery packs comprises the following steps:
(1): judging whether the storage battery pack needs to be charged or discharged, and entering the step (2) if the storage battery pack needs to be charged; if discharging is needed, entering the step (3);
(2): a group of storage batteries needing to be charged is disconnected with a load circuit through a switch circuit and is connected to the charging management unit; if the multiple groups of storage batteries need to be charged, the multiple groups of storage batteries are alternately connected to the charging management unit through the switch circuit to be charged;
(3): the multiple groups of storage batteries are disconnected with the charged storage batteries through the switch circuit and connected to the load circuit, and the multiple groups of storage batteries are connected in parallel to discharge.
Further, when a plurality of groups of storage batteries in the step (2) need to be charged, charging management is carried out according to the priority of the storage battery pack, and charging is carried out in a grouping mode according to the priority.
Further, when the plurality of groups of storage batteries are discharged in parallel in the step (3), the discharge management unit distributes discharge current according to the external discharge capacity of each storage battery group, so that each storage battery group performs balanced discharge.
Furthermore, the storage battery pack in the step (2) or the step (3) needs capacity expansion, and a group of storage battery packs with proper capacity is added in parallel on the basis of the original storage battery pack.
Due to the adoption of the technology, compared with the prior art, the invention has the positive and beneficial effects that:
1. the management device and the method for the parallel connection of the different types of storage batteries realize the functions of mutual parallel connection use and alternate charging of a plurality of groups of different storage batteries through the MOSFET switch circuit, the charging management unit, the discharging management unit, the monitoring module, the direct current distribution unit and the alternating current distribution unit, solve the problem of limitation of the parallel connection use of the original storage batteries and provide convenient conditions for purchasing and selecting communication storage batteries.
2. The management device and the method for the parallel connection of the storage batteries of different types can realize the capacity expansion of the storage battery needing to prolong the guarantee time of the backup power supply by selecting and adding a group of storage batteries with proper capacity, replace the situation that the original storage battery is completely replaced, and save a large amount of cost for the capacity expansion of the storage battery.
3. The management device and the method for the parallel connection of the different types of storage batteries realize the balanced discharge of the storage batteries of each group through the control of the discharge management unit on the storage batteries of each group, the charge management unit carries out matched charge current according to the rated capacity of the different storage batteries, and the storage batteries of each group are charged according to priority alternate current, so that the old use of the storage batteries which cannot meet the contract signing time in the prior art is realized, the utilization rate of the storage batteries is improved, and the cost is saved.
4. The management device and the method for the parallel connection of the different types of storage battery packs realize that the originally planned one-time input large-capacity storage battery pack is changed into a plurality of groups of small-capacity storage battery packs, realize the standardized configuration of the storage battery packs and save the one-time input cost.
5. The management device and the method for the parallel connection of the storage battery packs of different types realize the small capacity of the storage battery packs, and the small capacity storage battery packs are arranged in a building block manner, so that the occupied area is saved.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (9)
1. A management device for parallel connection of different types of storage battery packs is characterized in that: the system comprises a monitoring module, a charging management unit, a discharging management unit, a direct current distribution unit and an alternating current distribution unit; the device is respectively connected with a mains supply input, at least two groups of storage batteries connected in parallel and a power environment monitoring host;
the monitoring module is respectively connected with the direct current power distribution unit, the charging management unit, the discharging management unit and the power environment monitoring host;
the commercial power input is sequentially connected with the alternating current power distribution unit and the charging management unit, and the commercial power input supplies power to the charging management unit through the alternating current power distribution unit; the charging management unit sequentially charges a plurality of groups of storage batteries in turn through the direct current power distribution unit and the switch circuit;
the discharging management unit is connected with the direct current power distribution unit and manages simultaneous discharging of the storage batteries to the load circuit by sequentially controlling the direct current power distribution unit and the switch circuit; the switching circuit is configured for switching between a load circuit and a charge management unit;
the discharge management unit comprises a second control unit, a module address bit detection circuit, a dry contact point alarm signal output circuit, a state indicator lamp, a second communication module, a first auxiliary power supply module, an MOSFET drive circuit, a temperature detection circuit, a storage battery charging and discharging current detection circuit, a storage battery voltage detection circuit, a storage battery short circuit and overdischarge protection circuit and a non-circulation control circuit, the second control unit is respectively connected with the module address bit detection circuit, the main contact point alarm signal output circuit, the state indicator lamp, the second communication module, the first auxiliary power supply module, the MOSFET drive circuit, the temperature detection circuit, the storage battery charging and discharging current detection circuit, the storage battery voltage detection circuit, the storage battery short circuit and overdischarge protection circuit and the non-circulating current control circuit, and the discharging management unit is connected with the monitoring module through the second communication module;
the management method adopted by the management device for the parallel connection of the storage batteries of different types comprises the following steps:
(1): judging whether the storage battery pack needs to be charged or discharged, and entering the step (2) if the storage battery pack needs to be charged; if discharging is needed, entering the step (3);
(2): a group of storage batteries needing to be charged is disconnected with a load circuit through a switch circuit and is connected to the charging management unit; if the multiple groups of storage batteries need to be charged, the multiple groups of storage batteries are alternately connected to the charging management unit through the switch circuit to be charged;
(3): the multiple groups of storage batteries are disconnected with the charged storage batteries through the switch circuit and connected to the load circuit, and the multiple groups of storage batteries are in parallel connection for discharging;
when a plurality of groups of storage batteries in the step (2) need to be charged, carrying out charging management according to the priority of the storage battery pack, and carrying out charging in a grouping manner according to the priority stream;
when the plurality of groups of storage batteries are discharged in parallel in the step (3), the discharge management unit distributes discharge current according to the external discharge capacity of each storage battery group, so that each storage battery group performs balanced discharge;
the storage battery pack in the step (2) or the step (3) needs capacity expansion, and a group of storage battery packs with proper capacity are added in parallel on the basis of the original storage battery pack.
2. The apparatus for managing parallel connection of secondary batteries of different types according to claim 1, wherein: the alternating current distribution unit adopts an alternating current wiring terminal, and mains supply input is input through the alternating current wiring terminal to supply power to the charging management unit; the direct current distribution unit adopts a direct current wiring terminal.
3. The apparatus for managing parallel connection of secondary batteries of different types according to claim 1, wherein: the charging management unit comprises an EMI suppression circuit, a surge suppression circuit, an input rectification circuit, a PFC circuit, a full-bridge conversion circuit and an output rectification filter circuit, wherein 220V alternating current input by mains supply sequentially passes through the EMI suppression circuit, the surge suppression circuit, the input rectification circuit, the PFC circuit, the full-bridge conversion circuit and the output rectification filter circuit and is connected to the direct current distribution unit after being converted into direct current with suitable voltage.
4. A management apparatus for parallel connection of different types of secondary batteries according to claim 3, wherein: the charging management unit comprises an input signal acquisition circuit, a PFC control circuit, a full-bridge conversion control circuit, a first control unit and a first communication module, wherein the input end of the input signal acquisition circuit is arranged between the surge suppression circuit and the input rectification circuit to acquire an input signal, and the output end of the input signal acquisition circuit is connected with the first control unit; the PFC circuit is connected to the first control unit through the PFC control circuit, the full-bridge conversion circuit and the output rectification filter circuit are respectively connected with the first control unit through the full-bridge conversion control circuit, the first control unit is connected with the first communication module, and the charging management unit is communicated with the monitoring module through the first communication module.
5. The apparatus for managing parallel connection of secondary batteries of different types according to claim 1, wherein: the switch circuit adopts MOSFET to realize the switching of the storage battery between the load circuit and the charging management unit which are connected with the storage battery through the direct current power distribution unit.
6. The apparatus for managing parallel connection of secondary batteries of different types according to claim 1, wherein: the monitoring module comprises a third control unit, a peripheral circuit, a third communication module, a fourth communication module, a fifth communication module, a second auxiliary power module, a clock circuit, a key module and a display module, wherein the third control unit is respectively connected with the peripheral circuit, the third communication module, the fourth communication module, the fifth communication module, the second auxiliary power module, the clock circuit, the key module and the display module; the monitoring module is communicated with the charging management unit through the third communication module; the monitoring module is communicated with the discharge management unit through the fourth communication module; the monitoring module is communicated with the dynamic environment monitoring host through the fifth communication module.
7. The apparatus for managing parallel connection of secondary batteries of different types according to claim 6, wherein: the peripheral circuit comprises a crystal oscillator circuit, a reset circuit, a filter circuit and a JTAG circuit, and the third control unit is respectively connected with the crystal oscillator circuit, the reset circuit, the filter circuit and the JTAG circuit.
8. The apparatus for managing parallel connection of secondary batteries of different types according to claim 7, wherein: the display module comprises an LCD display screen and an audible and visual alarm module, the LCD display screen receives and displays information transmitted by the first control unit, and the audible and visual alarm module receives alarm information transmitted by the first control unit and performs audible and visual alarm.
9. A management method of a management device for parallel connection of secondary batteries of different types according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:
(1): judging whether the storage battery pack needs to be charged or discharged, and entering the step (2) if the storage battery pack needs to be charged; if discharging is needed, entering the step (3);
(2): a group of storage batteries needing to be charged is disconnected with a load circuit through a switch circuit and is connected to the charging management unit; if the multiple groups of storage batteries need to be charged, the multiple groups of storage batteries are alternately connected to the charging management unit through the switch circuit to be charged;
(3): the multiple groups of storage batteries are disconnected with the charged storage batteries through the switch circuit and connected to the load circuit, and the multiple groups of storage batteries are connected in parallel to discharge.
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| CN109167111A (en) * | 2018-07-12 | 2019-01-08 | 国网山西省电力公司电力科学研究院 | The LiFePO4 standby battery group charging method for inhibiting circulation to generate |
| CN109066941A (en) * | 2018-08-10 | 2018-12-21 | 必利恩（北京）新能源技术研究有限责任公司 | Combined type high-energy storage battery system and discharge energy method for improving |
| CN110138051A (en) * | 2019-06-17 | 2019-08-16 | 中国铁塔股份有限公司 | A kind of cell managing device, system and control method |
| CN110460032B (en) * | 2019-07-09 | 2021-06-22 | 国网河北省电力有限公司衡水供电分公司 | Power transmission method |
| JP2021191095A (en) * | 2020-05-29 | 2021-12-13 | 株式会社日立製作所 | Power storage system control device, power storage system, and program |
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