CN114204658A - Storage battery pack online capacity checking system - Google Patents
Storage battery pack online capacity checking system Download PDFInfo
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- CN114204658A CN114204658A CN202111658632.3A CN202111658632A CN114204658A CN 114204658 A CN114204658 A CN 114204658A CN 202111658632 A CN202111658632 A CN 202111658632A CN 114204658 A CN114204658 A CN 114204658A
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- 238000003860 storage Methods 0.000 title claims abstract description 219
- 230000000875 corresponding effect Effects 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims description 28
- 230000008569 process Effects 0.000 claims description 25
- 238000007599 discharging Methods 0.000 claims description 23
- 230000003993 interaction Effects 0.000 claims description 8
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 230000002452 interceptive effect Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 2
- 238000012795 verification Methods 0.000 claims 9
- 239000000178 monomer Substances 0.000 abstract description 12
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
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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
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The utility model relates to a direct current power supply art field discloses an online nuclear capacity system of storage battery, the storage battery of this system is connected with direct current bus, connect the machine that charges between alternating current electric network and the direct current bus, storage battery and machine that charges supply power for direct current load through direct current bus jointly, storage battery includes a plurality of monomer batteries of parallelly connected on direct current bus, direct current bus and the anodal switch unit of corresponding monomer battery, every monomer battery pairs and connects the discharge unit input, the discharge unit output is connected with alternating current electric network, a plurality of discharge units connect the control unit respectively, the control unit connects the switch unit respectively, the discharge unit, signal acquisition unit and memory cell, after the control unit received nuclear capacity instruction, the corresponding action of control switch unit and discharge unit. The storage battery pack can realize line core capacity, reduce maintenance cost, prolong the service life of the storage battery and ensure the reliability and safety of the storage battery pack.
Description
Technical Field
The application relates to the technical field of direct-current power supplies, in particular to an online capacity checking system of a storage battery pack.
Background
The storage battery pack is a backup power supply of the direct current system, the quality of the storage battery pack directly influences the stability of the direct current power supply system, and once a problem occurs, the direct current power supply system is subjected to major accidents such as paralysis and equipment outage. Therefore, the health condition of individual single storage batteries in the storage battery pack can be found in time, and the method has important significance for safe and stable operation of the whole storage battery pack.
After the storage battery pack is put into use, the storage battery is in a floating charge state for a long time by the charging device, due to the difference between the single storage batteries and the external environment, the aging and vulcanization speeds of the single storage batteries are actually different, it is difficult to ensure that the impedance of each single storage battery in the storage battery pack is equal to realize balanced charging, part of the single storage batteries are overcharged and part of the single storage batteries are not fully charged in the whole floating charge process, the withstand voltage risk and the vulcanization speed of the storage battery are increased due to long-term overcharge, the impedance of the storage battery pack is increased, the capacity is reduced, the reliability and the service life of the storage battery pack are reduced, the increase of the impedance also brings a potential safety hazard, when the main power supply is cut off, and when the storage battery pack supplies power, the temperature of the monomer with large impedance is rapidly increased under the action of current, and the possibility of combustion of the storage battery is increased.
And carrying out a capacity check charge-discharge test, namely capacity check. The storage battery needs to be checked periodically to determine the discharge capacity of the storage battery, so that the situation that the equipment fails after power failure due to the reduction of the power supply capacity of the storage battery is prevented, and the production or data safety is endangered.
The existing storage battery pack usually adopts a series connection form of a plurality of single storage batteries, so that the problem of unbalanced charge and discharge of each single storage battery is easily caused; the consistency requirement of the single storage battery in series operation is very high, when the operating storage battery pack is discharged, the line core capacity cannot be realized, the tested storage battery pack needs to be separated from a direct current bus system, and meanwhile, the energy of the storage battery needs to be consumed in the modes of heat energy and the like, so that the problem of heat dissipation exists. The method has long time consumption, high labor cost and complicated process, and generates great potential safety hazard to the normal operation of a power supply system.
Disclosure of Invention
In order to realize the online capacity checking of the storage battery pack, reduce the maintenance cost, prolong the service life of the storage battery and ensure the reliability and the safety of the storage battery pack, the application provides an online capacity checking system of the storage battery pack.
The above application purpose of the present application is achieved by the following technical solutions:
an on-line capacity checking system of a storage battery pack comprises an alternating current power grid, a direct current bus, the storage battery pack and a charger, wherein the storage battery pack is connected with the direct current bus, the charger is connected between the alternating current power grid and the direct current bus, the storage battery pack and the charger supply power for a direct current load on the direct current bus through the direct current bus, the storage battery pack comprises a plurality of single storage batteries, the single storage batteries are connected with the direct current bus in parallel, a switch unit is connected between the direct current bus and the positive electrode of the corresponding single storage battery, each single storage battery is connected with the input end of a discharge unit in a matched mode, the output end of the discharge unit is connected with the alternating current power grid, the discharge units are connected with a control unit through respective interfaces, and the control unit is respectively connected with the switch unit, a signal acquisition unit and a storage unit; the signal acquisition unit is used for acquiring the state information of the single storage battery, the direct current bus and the alternating current power grid; the storage unit is used for storing the state information, the analysis and processing result of the control unit and the preset threshold; the control unit is used for sending a nuclear capacity instruction to the discharge unit, controlling the switch unit to be switched off or switched on, acquiring the state information and the nuclear capacity data, and obtaining a performance analysis result of the nuclear capacity single storage battery if the nuclear capacity single storage battery reaches a nuclear capacity termination condition; when the discharge unit is in a discharge state, the switch unit is disconnected; and when the discharging unit does not work, the switching unit is closed, and the charger charges the single storage battery through the direct current bus.
By adopting the technical scheme, after the control unit receives the capacity checking instruction, if the charging current of the charger is smaller than the preset charging current threshold value of the charger and the voltage of the alternating current power grid is within the preset voltage threshold value range of the alternating current power grid, the control unit controls the switch unit to be switched to the off state and controls the corresponding discharging unit to discharge the single storage battery matched with the switch unit, the direct current of the single storage battery is converted into alternating current through the discharging unit and fed back to the alternating current power grid, the dissipation of low heat in the online capacity checking and capacity checking process of the single storage battery is realized, the energy conservation and environmental protection are realized, and the reliable and safe operation of a power supply system is improved.
Preferably, the switch unit comprises a normally closed contactor and a diode which are connected in parallel, the negative electrode of the diode is connected with the direct current bus, the positive electrode of the diode is connected with the positive electrode of the single storage battery, and the normally closed contactor is connected with the control unit; and the contact of the normally closed contactor of the switch unit is opened, and the contact of the normally closed contactor of the switch unit is closed.
By adopting the technical scheme, the switch unit adopts the normally closed contactor and the diode which are connected in parallel, and if the contact of the normally closed contactor is disconnected, the charger cannot charge the single storage battery, so that the normal nuclear capacity of the discharge unit is ensured; if the contact of the normally closed contactor is closed, the charging machine can charge the single storage battery, and the reliability of the backup power supply is ensured.
Preferably, in the single storage battery nuclear capacity process, if the direct current bus loses power, the single storage battery nuclear capacity outputs direct current to the direct current bus through the diode.
By adopting the technical scheme, in the nuclear capacity process, if the direct current bus is out of power, the single storage battery of the nuclear capacity can directly carry out direct current output to the direct current bus through the diode of the switch unit, and the stability of the direct current load power utilization is ensured.
Preferably, in the single storage battery nuclear capacity process, if the alternating current power grid is under voltage loss, the control unit analyzes and judges whether a voltage difference value between the single storage battery of the current nuclear capacity and other single storage batteries which are not in the nuclear capacity process is smaller than a preset voltage difference threshold value, if so, the control unit closes the switch unit and correspondingly stops the discharge unit; if not, the control unit maintains to turn off the switch unit.
By adopting the technical scheme, in the nuclear capacity process, if the alternating current power grid is in voltage loss, the control unit analyzes and judges whether the voltage difference value between the single storage battery with the current nuclear capacity and other single storage batteries which are not in the nuclear capacity process is smaller than a preset voltage difference threshold value, if so, the control unit controls the switch unit to be closed, the discharge unit stops working, and the single storage battery outputs direct current to the direct current bus through the switch unit; if the control unit analyzes and judges that the voltage difference value between the current single storage battery with the nuclear capacity and other single storage batteries which are not in the nuclear capacity process is not smaller than the preset voltage difference threshold value, the control unit disconnects the switch unit, the single storage battery without the nuclear capacity is prevented from reversely charging the single storage battery, and the safety of the storage battery pack is ensured.
Preferably, the single storage battery comprises a plurality of single storage batteries connected in series, and each single storage battery is connected with a current follower in parallel; and if one single storage battery is open-circuited, the current of the single storage battery flows through the afterflow device corresponding to the single storage battery for afterflow.
By adopting the technical scheme, the single storage battery is under the high-current impact, welding spots between the polar plate of the single storage battery and the bus bar are easy to fuse, one section of the single storage battery in series connection is opened, the single storage battery is completely ineffective, after the current-continuing device is arranged in parallel connection of each section of the single storage battery, the single storage battery of any section is opened, the current of the single storage battery can flow through the current-continuing device corresponding to the current-continuing device, and the normal work of the single storage battery is ensured.
Preferably, the nuclear capacity termination condition includes: during capacity checking, if the discharge voltage of the single storage battery is smaller than a preset discharge voltage threshold value or the discharge capacity of the single storage battery reaches a preset discharge capacity threshold value, or the discharge time of the single storage battery reaches a preset discharge time threshold value; when any one of the above conditions is satisfied, the control unit controls the discharge unit to stop discharging the corresponding single storage battery.
By adopting the technical scheme, when the single storage battery with the nuclear capacity meets the nuclear capacity termination condition, the nuclear capacity discharge of the single storage battery is terminated, and the control unit processes the state information of the single storage battery collected by the signal collecting unit to obtain the discharge capacity of the single storage battery with the nuclear capacity, so that whether the single storage battery needs to be replaced or not is judged.
Preferably, the signal acquisition unit includes a dc bus voltage acquisition module, an ac grid voltage acquisition module, a charger charging current acquisition module, and a single storage battery state acquisition module, and the corresponding state information includes a dc bus voltage, an ac grid voltage, a charger charging current, a single storage battery discharging voltage, a single storage battery discharging time, a single storage battery internal resistance, and a single storage battery terminal post temperature.
By adopting the technical scheme, the signal acquisition unit acquires the state information of the direct-current bus, the alternating-current power grid, the charging motor and the single storage battery and transmits the state information to the control unit, the control unit analyzes and compares the state information with the preset threshold value stored in the storage unit according to the state information to make a judgment result, and the control switch unit and the discharging unit make corresponding actions, so that the online capacity checking of the storage battery pack is realized, and the safety of the system is improved.
Preferably, the control unit is connected with the human-computer interaction terminal, if the discharge unit stops discharging, the control unit obtains the discharge capacity information of the nuclear capacity single storage battery according to the discharge current of the nuclear capacity single storage battery and the discharge time of the nuclear capacity single storage battery, and the human-computer interaction terminal is used for inputting a nuclear capacity instruction and a preset threshold value and displaying the discharge capacity information of the nuclear capacity single storage battery.
Through adopting above-mentioned technical scheme, the man-machine interaction terminal is assigned the nuclear capacity instruction to the control unit, the control unit receives behind the nuclear capacity instruction disconnection switch unit, the unit that discharges starts, nuclear capacity monomer battery and the unit that discharges form the return circuit, monomer battery is the alternating current with the direct current contravariant and is fed back alternating current power grid, when nuclear capacity termination condition reaches the nuclear capacity stop nuclear capacity, the control unit transmits the capacity information of the monomer battery after the nuclear capacity for the man-machine interaction terminal, can more make things convenient for audio-visual state of understanding monomer battery, guarantee system safety and stability's operation.
Preferably, the discharge unit includes a DC/AC inverter and a discharge switch connected in series, and the discharge switch is connected to the control unit.
By adopting the technical scheme, after the control unit receives the nuclear capacity instruction, the control unit controls the switch unit to be switched off and the discharge switch to be switched on, so that the DC/AC inverter and the single storage battery with the nuclear capacity form a discharge loop, the direct current is inverted into the alternating current to be fed back to the alternating current power grid, the online nuclear capacity is realized, the heat generated during the nuclear capacity of the single storage battery is reduced, and the purposes of energy conservation and environmental protection are achieved.
Preferably, the control unit is connected with an alarm unit; and if the state information of the single storage battery, the direct current bus and the alternating current power grid is abnormal compared with a preset threshold value, the control unit controls the alarm unit to give an alarm.
By adopting the technical scheme, when the state information of the single storage battery, the direct current bus and the alternating current power grid is abnormal compared with the preset threshold value, the alarm unit gives an alarm prompt to remind relevant workers to process in time, and the safe operation of the system is ensured.
To sum up, the beneficial technical effect of this application does:
according to the single storage battery, the plurality of single storage batteries are connected in parallel, each single storage battery is matched with the corresponding discharge unit, the single storage batteries can be independently checked for capacity without being separated from a direct current bus, and the plurality of single storage batteries can be output in parallel and can be independently withdrawn, so that the power consumption of a system is not influenced; the storage battery pack performs online check discharge, and inverts direct current into alternating current to feed back to an alternating current power grid, so that heat consumption can be reduced in the discharge process, the effects of energy conservation and environmental protection are achieved, the operation and maintenance cost of a direct current system is greatly reduced, the reliability is higher, and the production efficiency and the safety are improved; the maintenance personnel can timely master the running state of the storage battery pack, accurately obtain the actual capacity of the storage battery, pre-judge the usable time of the storage battery and ensure the reliable and safe running of a power supply system.
Drawings
FIG. 1 is a schematic structural diagram of the present application;
FIG. 2 is a block diagram of the present application;
fig. 3 is a schematic structural diagram of a connection current connector in a single storage battery.
Figure, 1, an alternating current grid; 2. a direct current bus; 3. a battery pack; 31. a single storage battery; 311. a single battery; 312. a flow continuing device; 4. a charger; 5. a direct current load; 6. a switch unit; 61. a normally closed contactor; 62. a diode; 7. a signal acquisition unit; 8. a discharge unit; 81. a DC/AC inverter; 82. a discharge switch; 9. a control unit; 10. a storage unit; 11. a human-computer interaction terminal; 12. and an alarm unit.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The application provides an online storage battery pack capacity checking system which can be applied to a direct-current uninterruptible power supply system.
As shown in fig. 1 and 2, an on-line battery pack capacity check system includes an ac power grid 1, a dc bus 2, the storage battery pack 3 is connected with the direct-current bus 2, the charger 4 is connected between the alternating-current power grid 1 and the direct-current bus 2, the storage battery pack 3 and the charger 4 jointly supply power to a direct-current load 5 on the direct-current bus 2 through the direct-current bus 2, the storage battery pack 3 comprises a plurality of single storage batteries 31, the single storage batteries 31 are connected with the direct-current bus 2 in parallel, a switch unit 6 is connected between the direct-current bus 2 and the positive electrode of the corresponding single storage battery 31, each single storage battery 31 is connected with the input end of a discharge unit 8 in a pairing mode, the output end of the discharge unit 8 is connected with the alternating-current power grid 1, the discharge units 8 are connected with a control unit 9 through respective interfaces, and the control unit 9 is further connected with the switch unit 6, a signal acquisition unit 7 and a storage unit 10 respectively; the signal acquisition unit 7 is used for acquiring the state information of the single storage battery 31, the direct current bus 2 and the alternating current power grid 1; the storage unit 10 is used for storing the state information, the analysis and processing result of the control unit 9 and a preset threshold; after receiving the nuclear capacity instruction, the control unit 9 controls the corresponding actions of the switch unit 6 and the discharge unit 8 to obtain the state information and the nuclear capacity data, and if the nuclear capacity single storage battery 31 reaches the nuclear capacity termination condition, the performance analysis result of the nuclear capacity single storage battery 31 is obtained; when the discharge unit 8 is in a discharge state, the switch unit 6 is turned off; when the discharging unit 8 does not work, the switch unit 6 is closed, and the charger 4 charges the single storage battery 31 through the direct current bus 2.
Specifically, after the control unit 9 receives the nuclear capacity instruction, if the charging current of the charger 4 is smaller than the preset charging current threshold of the charger 4 and the voltage of the alternating current power grid 1 is within the preset voltage threshold range of the alternating current power grid 1, the control unit 9 switches the switch unit 6 to the off state and controls the corresponding discharge unit 8 to discharge the paired single storage battery 31, the single storage battery 31 of the nuclear capacity and the discharge unit 8 form a loop, the direct current of the single storage battery 31 is converted into the alternating current through the discharge unit 8 and fed back to the alternating current power grid 1, the on-line nuclear capacity of the single storage battery 31 is realized, low heat dissipation in the nuclear capacity process is realized, the energy conservation and environmental protection are realized, and the reliable and safe operation of a power supply system is ensured.
The switching unit 6 of the present embodiment includes a normally closed contactor 61 and a diode 62 connected in parallel, the normally closed contactor 61 may adopt other controllable devices, and the diode 62 may adopt a schottky diode 62. The negative electrode of the diode 62 is connected with the direct current bus 2, the positive electrode of the diode 62 is connected with the positive electrode of the single storage battery 31, the normally closed contactor 61 is connected with the control unit 9, the opening switch unit 6 is used for opening the contact of the normally closed contactor 61, and the closing switch unit 6 is used for closing the contact of the normally closed contactor 61; the discharge unit 8 comprises a DC/AC inverter 81 and a discharge switch 82 connected in series, the discharge switch 82 is connected with the control unit 9, and the discharge switch 82 is a normally open contactor.
According to different fault positions of a power supply system, the method can be divided into direct current bus 2 voltage loss and alternating current power grid 1 voltage loss. At present, in an electric power system, a direct current load 5 is normally supplied with power by a charger 4, the charger 4 also charges a storage battery 3 in a floating manner, and the storage battery 3 is in a standby state. The switching unit 6 can switch the states of the respective cells 31. When the system normally works, the direct current bus 2 is directly connected with the storage battery pack 3 through a normally closed contact connected with the normally closed contactor 61; when discharging is needed, the normally closed contactor 61 is powered on, the normally closed contact is opened, and the diode 62 between the charger 4 and the single storage battery 31 ensures that the charger 4 cannot charge the corresponding single storage battery 31, but when the alternating current power grid 1 loses power, the single storage battery 31 can emergently supply power to the direct current load 5 through the corresponding diode 62.
When the system normally works, the storage battery 3 and the direct current bus 2 are directly connected through the normally closed contact of the normally closed contactor 61, and the storage battery 3 is used as a standby power supply. When the direct current bus 2 loses power, the normally closed contactor 61 is electrified, the normally closed contact is opened, and the single storage battery 31 can be connected with the direct current bus 2 through the corresponding diode 62, so that when the single storage battery 31 carries out nuclear capacity, the charger 4 only supplies power for the direct current load 5, does not participate in the discharging process, and does not charge the nuclear capacity single storage battery 31. And once the alternating current power grid 1 has a fault or loses power, the single storage battery 31 can supply power to the direct current load 5 in time through the diode 62, so that the continuity of the power supply of the direct current load 5 is ensured. In the process of the nuclear capacity discharge of the storage battery pack 3, the direct current of the single storage battery 31 is inverted into 380V alternating current through the discharge unit 8 and is fed back to the alternating current power grid 1 for recycling.
When the charger 4 charges the single storage battery 31, the contact of the normally closed contactor 61 is kept closed, and the charging current of the charger 4 charges the single storage battery 31 through the contact. During the nuclear capacity, the control unit 9 controls the contact of the normally closed contactor 61 to be opened and controls the discharge unit 8 to be started, namely, the normally open contactor is electrified, and the normally open contact is closed, so that the single storage battery 31 with the nuclear capacity and the DC/AC inverter 81 form a loop, and the normal nuclear capacity of the discharge unit 8 is ensured. When the direct current bus 2 is in voltage loss, the current of the single storage battery 31 with the nuclear capacity can quickly supply power to the direct current load 5 through the diode 62, and the safety of the power utilization of the direct current load 5 is ensured.
In order to solve the problems of a large amount of heat and heat dissipation generated in the discharging process of the storage battery pack 3, the DC/AC inverter 81 is selected as the discharging unit 8, energy conversion is realized, the energy stored by the single storage battery is converted into alternating current electric energy to be fed back to the alternating current power grid 1, and the energy storage device is safe and environment-friendly. The DC/AC inverter 81 has high efficiency, generates little heat during operation, and can safely and reliably realize the on-line capacity check of the battery pack 3.
Because the system comprises a plurality of single storage batteries 31 connected in parallel, when one single storage battery 31 is subjected to online capacity checking, if the direct current bus 2 is subjected to voltage loss, the fact that not only the power supply part of the alternating current power grid 1 fails, but also other single storage batteries 31 which are not subjected to capacity checking all fail is shown, and the direct current load 5 urgently needs the single storage battery 31 to supply power, so that no matter what state the single storage battery 31 in the online capacity checking state is, the single storage battery can ensure that the direct current bus 2 supplies power for the direct current load 5 through the diode 62 without delay, and the risk that the storage battery 3 is offline is avoided. Meanwhile, the control unit 9 also controls the coil of the normally closed contactor 61 of the switch unit 6 to lose power, the normally closed contact of the normally closed contactor is switched to a closed state, the current of the single storage battery 31 flows from the direct current bus 2 to the direct current load 5 through the normally closed contact, and the storage battery 3 is ensured to be always in a safe online state.
When one single battery 31 is subjected to online capacity checking, voltage loss of the alternating current power grid 1 occurs, which indicates that the alternating current power grid 1 has a fault, other single batteries 31 without capacity checking can provide direct current output, the single battery 31 with online capacity checking is connected with the other single batteries 31 without capacity checking in parallel through the diode 62, and if the switch unit 6 is closed at the moment, the other single batteries 31 without capacity checking can be charged. In order to avoid the situation of being charged, the control unit 9 analyzes and judges whether the voltage difference value between the single storage battery 31 with the current nuclear capacity and other storage batteries which are not in the nuclear capacity process is smaller than a preset voltage difference threshold value, if so, the control unit 9 closes the switch unit 6, namely the contact of the normally closed contactor 61 is closed, and correspondingly stops the work of the discharge unit 8; if not, the control unit 9 opens the switch unit 6, i.e. the coil of the normally closed contactor 61 is energized and its contacts are opened, avoiding the charging of the single battery 31 of the on-line nuclear capacity.
When the single storage battery 31 is in a normal operating state, that is, when the single storage battery 31 does not perform online capacity checking, the normally closed contactor 61 is switched to a closed state, and the charger 4 charges the single storage battery 31.
As shown in fig. 3, in an embodiment, the single battery 31 includes a plurality of single batteries 311 connected in series, each single battery 311 is connected in parallel with a current follower 312; if one of the single batteries 311 is open, the current of the single battery 31 flows through the current-continuing device 312 corresponding to the single battery 311. Under the impact of large current, the welding point between the polar plate of the single storage battery 311 and the bus bar is easy to be fused, if one single storage battery 311 in series connection is open, the whole single storage battery 31 is failed, after the current-continuing device 312 is arranged in parallel connection with each single storage battery 311, the single storage battery 311 of any section is open, the current of the single storage battery 31 can flow through the current-continuing device 312 corresponding to the current-continuing device, the open circuit of the single storage battery 31 is avoided, and the normal work of the single storage battery 31 is ensured.
The core capacity termination condition of this embodiment includes: during the capacity checking, if the discharge voltage of the single storage battery 31 is smaller than the preset discharge voltage threshold, or the discharge capacity of the single storage battery 31 reaches the preset discharge capacity threshold, or the discharge time of the single storage battery 31 reaches the preset discharge time threshold; when any one of the above conditions is satisfied, the control unit 9 controls the discharge unit 8 to stop discharging the corresponding cell storage battery 31, that is, controls the discharge switch 82 to be turned off. When the condition of terminating the nuclear capacity is reached, the nuclear capacity work of the single storage battery 31 is completed, and the control unit 9 processes the state information of the single storage battery 31 acquired by the signal acquisition unit 7 to obtain the discharge capacity information of the single storage battery 31 after the nuclear capacity is obtained, so as to judge whether the single storage battery 31 is aged or needs to be maintained or replaced.
The signal acquisition unit 7 of this embodiment includes a dc bus 2 voltage acquisition module, an ac power grid 1 voltage acquisition module, a charger 4 charging current acquisition module, and a single storage battery 31 state acquisition module, and the corresponding state information includes a dc bus 2 voltage, an ac power grid 1 voltage, a charger 4 charging current, a single storage battery 31 discharging voltage, a single storage battery 31 discharging time, a single storage battery 31 internal resistance, and a single storage battery 31 terminal temperature. The signal acquisition unit 7 acquires state information of the direct current bus 2, the alternating current power grid 1, the charging motor and the single storage battery 31 and transmits the state information to the control unit 9, the control unit 9 analyzes and compares the state information with a preset threshold value stored in the storage unit 10 according to the state information to make a judgment result, the control switch unit 6 and the discharge unit 8 perform corresponding actions, online capacity checking of the storage battery 3 is achieved, and the working state of the storage battery 3 can be known in time.
In one implementation, the control unit 9 is connected to a human-computer interaction terminal 11, and the human-computer interaction terminal is used for inputting a capacity checking instruction and a preset threshold value and displaying the discharged capacity information of the single storage battery 31 after the capacity checking. When the discharge unit 8 stops discharging, the control unit 9 obtains the discharge capacity information of the nuclear capacity single storage battery 31 according to the discharge current of the nuclear capacity single storage battery 31 and the discharge time of the single storage battery 31. Give the nuclear capacity instruction to the control unit 9 through the machine interactive terminal, the control unit 9 receives control switch unit 6 behind the nuclear capacity instruction, the unit 8 that discharges starts, nuclear capacity monomer battery 31 and the unit 8 that discharges form the return circuit, monomer battery 31 feeds back alternating current electric wire netting 1 with the direct current contravariant for the alternating current, when nuclear capacity termination condition satisfies, the control unit 9 transmits the capacity information of the monomer battery 31 after the nuclear capacity for man-machine interactive terminal 11, can be more convenient audio-visual understanding monomer battery 31's state, guarantee the operation of system safety and stability.
In an embodiment the control unit 9 is connected to an alarm unit 12. If the state information of the single storage battery 31, the direct current bus 2 and the alternating current power grid 1 is abnormal compared with a preset threshold value, the control unit 9 controls the alarm unit 12 to give an alarm prompt to remind relevant workers to process in time, and the safe operation of the system is guaranteed.
The specific core-volume process of the application is as follows: if the control unit 9 receives the core capacity instruction, the control unit 9 controls the switch unit 6 to be in a disconnected state, and simultaneously controls the discharge unit 8 to start discharging; when the discharging unit 8 reaches the termination condition, the control unit 9 controls the discharging unit 8 to stop working, controls the switch unit 6 to be in a conducting state, controls the charger 4 to uniformly charge the single storage battery 31, and enters floating charge after uniform charging is finished; after the unit storage battery 31 finishes the nuclear capacity, the process jumps to the nuclear capacity of the subsequent unit storage battery 31.
If the dc bus 2 loses voltage during the nuclear capacity, the single battery 31 supplies dc power to the dc load 5 on the dc bus 2 through the diode 62 of the switching unit 6.
If the alternating current power grid 1 loses power during the capacity checking, the control unit 9 analyzes and judges whether the voltage difference between the single storage battery 31 and the single storage battery 31 without the capacity checking in the capacity checking process is smaller than a voltage difference threshold value; if the current value is less than the preset value, the control unit 9 controls the switch unit 6 to be switched to the conducting state, and the control unit 9 controls the discharge unit 8 to stop working; if not, the control unit 9 controls the switch unit 6 to switch to the off state, preventing charging.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115877228A (en) * | 2023-02-28 | 2023-03-31 | 广东长实通信科技有限公司 | Storage battery charging and discharging monitoring method and system with remote nuclear capacity |
| CN116488316A (en) * | 2023-04-21 | 2023-07-25 | 国网浙江省电力有限公司建设分公司 | On-line nuclear capacity direct current power supply system |
| CN118259188A (en) * | 2024-04-19 | 2024-06-28 | 广东通顺能源技术发展有限公司 | An online accurate capacity verification system for power battery monomers |
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| CN112462289A (en) * | 2020-11-18 | 2021-03-09 | 江苏为恒智能科技有限公司 | Storage battery pack online capacity checking management device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112462289A (en) * | 2020-11-18 | 2021-03-09 | 江苏为恒智能科技有限公司 | Storage battery pack online capacity checking management device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115877228A (en) * | 2023-02-28 | 2023-03-31 | 广东长实通信科技有限公司 | Storage battery charging and discharging monitoring method and system with remote nuclear capacity |
| CN116488316A (en) * | 2023-04-21 | 2023-07-25 | 国网浙江省电力有限公司建设分公司 | On-line nuclear capacity direct current power supply system |
| CN116488316B (en) * | 2023-04-21 | 2024-04-05 | 国网浙江省电力有限公司建设分公司 | An online core capacity DC power supply system |
| CN118259188A (en) * | 2024-04-19 | 2024-06-28 | 广东通顺能源技术发展有限公司 | An online accurate capacity verification system for power battery monomers |
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Application publication date: 20220318 |