CN108683203B - Energy storage system - Google Patents
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- CN108683203B CN108683203B CN201810335469.9A CN201810335469A CN108683203B CN 108683203 B CN108683203 B CN 108683203B CN 201810335469 A CN201810335469 A CN 201810335469A CN 108683203 B CN108683203 B CN 108683203B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 162
- 238000007599 discharging Methods 0.000 claims abstract description 51
- 206010068065 Burning mouth syndrome Diseases 0.000 claims description 171
- 238000009413 insulation Methods 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 102220497670 Leukotriene B4 receptor 1_N38A_mutation Human genes 0.000 claims description 6
- 230000017525 heat dissipation Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 230000003111 delayed effect Effects 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 13
- 230000002457 bidirectional effect Effects 0.000 description 7
- 238000010248 power generation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 1
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- 239000003086 colorant Substances 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- 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
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H02J7/0026—
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- H02J7/008—
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- H02J7/0088—
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to the technical field of energy storage, in particular to an energy storage system, which comprises a battery system, a battery system control unit connected with the battery system and an energy storage inverter PCS; the battery system comprises at least one group of battery modules, wherein each battery module comprises a plurality of single batteries connected in series and a battery management system BMS corresponding to the battery modules one to one; the battery system control unit is connected with the energy storage inverter PCS; the battery system control unit acquires state parameters of the battery system, judges the fault type of the battery system according to the state parameters and reports the fault type to the energy storage inverter PCS, and the energy storage inverter PCS controls the charging/discharging of the battery system according to the fault type; the invention can report the fault type, is beneficial to a user to find the fault in time and take necessary measures, and the energy storage inverter PCS can control the charging/discharging of the battery system aiming at different faults and various types, thereby further improving the safety of the battery system and being beneficial to prolonging the service life of the battery system.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to an energy storage system.
Background
With the continuous aggravation of global energy crisis and the gradual worsening of environment, the revolution of the energy field is imminent, and new energy power generation modes such as wind and light are generated and gradually developed.
The current household energy storage system is diversified in application, MOS is mostly adopted as switch control, the burning protection function is easy to fail under the condition of large current, and no alarm and effective measures are taken, so that dangers such as combustion, explosion and the like occur; in addition, the existing product and the PCS are not effectively communicated, and a safer measure for a battery system is not taken when multi-level alarm occurs, so that the damage to the service life and the safety performance of the battery is finally caused to cause danger. And the indication of the existing energy storage system in the running state and after the fault is not clear enough, which is not beneficial to the maintenance of the user.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides the energy storage system which can report the fault type, is beneficial to a user to find the fault in time and take necessary measures, and the energy storage inverter PCS can control the charging/discharging of the battery system according to different fault types, thereby further improving the safety of the battery system and being beneficial to prolonging the service life of the battery system.
In order to achieve the purpose, the invention adopts the following technical scheme:
an energy storage system comprises a battery system, a battery system control unit connected with the battery system, and an energy storage inverter PCS; the battery system comprises at least one group of battery modules, wherein each battery module comprises a plurality of single batteries connected in series and a battery management system BMS corresponding to the battery modules one to one; the battery system control unit is connected with the energy storage inverter PCS;
the battery system control unit collects state parameters of the battery system, judges the fault type of the battery system according to the state parameters and reports the fault type to the energy storage inverter PCS, and the energy storage inverter PCS controls charging/discharging of the battery system according to the fault type.
Preferably, the battery system comprises a plurality of battery modules and a plurality of battery management systems BMS which are respectively in one-to-one correspondence with the battery modules, the battery management systems BMS are connected with each other and can automatically identify a master and a slave to form a battery system control unit, one of the battery management systems BMS of the battery modules is used as a master to collect state parameters of the battery system and is communicated with the energy storage inverter PCS, and the rest of the battery management systems BMS are used as slaves and provide state parameter information for the master.
Preferably, the battery system comprises a battery module and a battery management system BMS corresponding to the battery module, the battery management system BMS constitutes a battery system control unit, and the battery management system BMS serves as a host to collect state parameters of the battery system and communicates with the energy storage inverter PCS.
Preferably, the battery management system BMS collects the battery module temperatures of the respective battery modules through the temperature sensors, and the battery management system BMS as the host judges whether the energy storage system has a fault in which the temperature difference of the battery system is large according to the collected battery module temperatures of the plurality of battery modules.
Preferably, the battery management system BMS is respectively connected to the individual batteries of the battery module connected thereto, collects voltages of the individual batteries, calculates a voltage of the battery module and a voltage value of the module individual according to the voltages of the individual batteries, and determines whether a voltage imbalance fault of the individual batteries exists by comparing the voltages of the individual batteries with the voltage values of the module individual.
Preferably, the battery management system BMS is respectively connected to each of the individual batteries of the battery module connected thereto, collects voltages of the individual batteries, and calculates a voltage of the battery module according to the voltages of the individual batteries, and the battery management system BMS compares the collected voltages of the individual batteries with a voltage threshold of the individual battery to determine whether the individual battery has a fault that the voltage of the individual battery is low and the voltage of the individual battery is high; the battery management system BMS used as the host machine collects the voltages of all the battery modules to obtain the voltage of the battery system, compares the calculated voltage of the battery system with the voltage threshold value of the battery system and judges whether the battery system has the faults of low voltage of the battery system and high voltage of the battery system;
and/or the battery management system BMS collects the charging current and the discharging current of the battery modules through a current divider FL1, calculates the charging current and the discharging current of the battery system according to the charging current and the discharging current of the battery modules, compares the charging current of the battery system with the charging current threshold of the battery system, compares the discharging current of the battery system with the discharging current threshold of the battery system, and judges whether the battery system has the faults of large charging current and large discharging current;
and/or, battery management system BMS passes through temperature sensor and gathers battery module temperature, judges whether there is the trouble that battery module temperature is high, battery module temperature is low, gathers the battery module temperature of all battery modules as the battery management system BMS of host computer and obtains the battery system temperature, judges whether the battery system has the trouble that battery system temperature is high, battery system temperature is low.
Preferably, the battery management system BMS acquires an insulation signal of the battery module through the R + insulation monitoring terminal and the R-insulation monitoring terminal thereof to obtain an insulation value, and determines whether the battery module has a fault with a low insulation value according to the acquired insulation value;
and/or, the battery management system BMS detects whether the battery module has the fault of relay adhesion.
Preferably, the battery system control unit sets a plurality of alarm levels for the same fault type, sets a plurality of different level thresholds for the same state parameter, and performs a graded alarm for the different level thresholds.
Preferably, the battery system control unit calculates the maximum chargeable current and the maximum dischargeable current of the battery system in real time, and reports the maximum chargeable current and the maximum dischargeable current to the energy storage inverter PCS, and the energy storage inverter PCS controls the actual charging current and the actual discharging current of the battery system not to exceed the maximum chargeable current and the maximum dischargeable current of the battery system reported by the battery system control unit.
Preferably, the highest single battery voltage collected by the battery management system BMS is less than a, the maximum chargeable current reported to the energy storage inverter PCS by the battery system control unit is N × 72A, and N is the number of battery modules;
the battery management system BMS acquires the highest single battery voltage, and the highest single battery voltage, which is a, is not more than b, the maximum chargeable current reported to the energy storage inverter PCS by the battery system control unit is N38A, N is the number of battery modules, a and b are preset protection thresholds, and a is less than b;
and if the highest single battery voltage collected by the battery management system BMS is greater than b, the battery system control unit reports that the energy storage inverter PCS stops charging, and if the highest single battery voltage falls below b, the battery system control unit still reports that the energy storage inverter PCS stops charging until the battery system control unit detects that the battery system discharges and the discharge capacity is greater than 5% of the battery system capacity, the battery system control unit determines the maximum chargeable current again according to the collected highest single battery voltage and reports the maximum chargeable current to the energy storage inverter PCS.
Preferably, the lowest single battery voltage collected by the battery management system BMS is greater than c, the maximum dischargeable current reported to the energy storage inverter PCS by the battery system control unit is N × 72A, and N is the number of battery modules;
the lowest single battery voltage collected by the battery management system BMS meets the condition that d is less than or equal to the lowest single battery voltage and is less than or equal to c, the maximum dischargeable current reported to the energy storage inverter PCS by the battery system control unit is N38A, N is the number of battery modules, a and b are preset protection thresholds, and d is less than c;
and if the lowest single battery voltage collected by the battery management system BMS is less than d, the battery system control unit reports the energy storage inverter PCS to stop discharging, and if the lowest single battery voltage rises back to a value above d, the battery system control unit still reports the energy storage inverter PCS to stop discharging until the battery system control unit detects that the battery system is charged and the charging capacity is more than 5% of the capacity of the battery system, the battery system control unit determines the maximum dischargeable current according to the collected lowest single battery voltage and reports the maximum dischargeable current to the energy storage inverter PCS.
Preferably, at power-on, after power-on delay, the plurality of battery management systems BMS automatically perform master-slave recognition, each battery management system BMS respectively detects the state of the corresponding battery module and transmits the state to the battery management system BMS as the master, the battery management system BMS as the master judges that if the voltage difference between the battery modules is less than the power-on voltage difference threshold and there is no fault type alarm, the contactor KM1 of the battery module is controlled to be closed by each battery management system BMS,
if the voltage difference between the battery modules is larger than the voltage difference threshold value, the contactor KM1 of the battery module with the lowest voltage and the contactor KM1 of the battery module with the lowest voltage difference smaller than the voltage difference threshold value are closed, charging is started, and after the voltage difference between the battery modules is smaller than the voltage difference threshold value, the contactors KM1 of the other battery modules are closed again.
Preferably, the lowest cell voltage collected by the battery system control unit is less than e, and the energy storage inverter PCS does not charge the battery system within the time T, the battery management system BMS automatically enters a sleep state and the contactor KM1 is turned off;
or the lowest single battery voltage collected by the battery system control unit is less than e, the energy storage inverter charges the battery system within the time T, and the battery management system BMS keeps the contactor KM1 closed. For example, e is 3.4V and time T is 24 hours.
Preferably, the battery modules comprise a positive electrode output end DC + and a negative electrode output end DC-, the positive electrode output end DC + and the negative electrode output end DC-are used for connecting the plurality of battery modules in parallel, the positive electrode BAT + of the battery modules is connected with the positive electrode output end DC + through a fuse FR1 and a contactor KM1 which are sequentially connected in series, and the negative electrode BAT-of the battery modules is connected with the negative electrode output end DC-through a shunt FL 1; the positive electrode BAT + of the battery module is connected with the input end of the first DC/DC converter through a ship-shaped switch K2 and a fuse FR2 which are sequentially connected in series, the negative electrode BAT-of the battery module is connected with the input end of the first DC/DC converter, the output end of the first DC/DC converter is connected with a battery management system BMS to provide a working power supply for the battery management system BMS, the battery management system BMS is connected with a wake-up switch K4, and the battery management system BMS is respectively connected with each single battery and is connected with a temperature sensor arranged in the battery module.
Preferably, the battery management system BMS is connected to the temperature control device through the control interface, the temperature control device includes a heat dissipation fan and a heating mechanism, the heat dissipation fan is activated when the temperature of the battery module exceeds a high temperature threshold thereof, which is advantageous for rapid heat dissipation of the battery module, and the heating mechanism is activated when the temperature of the battery module is lower than a low temperature threshold thereof.
Preferably, the battery management system BMS is connected to the indicating lamp set to provide an operating power to the indicating lamp set and control an operating state of the indicating lamp set.
Preferably, the lamp set includes a lamp electric board connected to the battery management system BMS and a plurality of lamps connected to the lamp electric board.
The energy storage system comprises a battery system control unit connected with the battery system, wherein the battery system control unit acquires state parameters of the battery system and judges the fault type according to the state parameters, so that the problem of the energy storage system can be found out in time, and a user can take necessary measures according to the fault type to avoid the damage of the energy storage system in the fault state after long-term operation; the energy storage system also comprises an energy storage inverter PCS, wherein the battery system control unit is linked with the energy storage inverter PCS, the energy storage inverter PCS can control charging/discharging of the battery system according to fault types, and the energy storage inverter PCS adopts different charging/discharging schemes according to different fault types, so that the battery system is protected more intelligently and effectively, and danger is avoided.
In addition, the battery system of the invention can comprise one battery module and also can comprise a plurality of battery modules connected in parallel, and a user can flexibly adjust the number of the battery modules so as to use the power consumption requirement of the user. Preferably, when the battery module of the battery system can be identified by a master and a slave, the battery management system BMS used as the master collects the state parameters of the battery system and communicates with the energy storage inverter PCS without an additional control chip, so that the use is convenient and the cost is low.
In addition, the battery module is input/output through the contactor KM1, the large current endurance capacity of the contactor KM1 is good, and the possibility of burning under the large current condition can be effectively reduced.
Drawings
FIG. 1 is a schematic diagram of the energy storage system of the present invention;
FIG. 2 is a schematic view of another embodiment of the energy storage system of the present invention;
fig. 3 is a schematic diagram illustrating the connection between the battery module and the battery system control unit according to the present invention;
fig. 4 is a schematic circuit diagram of the inventive indicator light set.
Detailed Description
The following further describes a specific embodiment of the energy storage system according to the present invention with reference to the examples shown in fig. 1 to 3. The energy storage system of the invention is not limited to the description of the following embodiments.
The energy storage system comprises a battery system, a battery system control unit connected with the battery system and an energy storage inverter PCS; the battery system comprises at least one group of battery modules, and each battery module comprises a plurality of serially connected single batteries and a battery management system BMS corresponding to the battery modules one to one; the battery system control unit is connected with the energy storage inverter PCS; the battery system control unit collects state parameters of the battery system, judges the fault type of the battery system according to the state parameters and reports the fault type to the energy storage inverter PCS, and the energy storage inverter PCS controls charging/discharging of the battery system according to the fault type.
The energy storage system comprises a battery system, a battery system control unit and an energy storage inverter PCS, wherein the battery system control unit acquires state parameters of the energy storage system and judges the fault type according to the state parameters, so that the problem of the energy storage system can be found in time, and the energy storage system is prevented from being damaged due to long-term operation in the fault state; the battery system control unit reports the fault type to the energy storage inverter PCS, the energy storage inverter PCS can control charging/discharging of the battery system according to the fault type, and the energy storage inverter PCS adopts different charging/discharging schemes according to different fault types, so that the battery system is protected more intelligently and effectively, and danger is avoided.
The energy storage system of the invention is a household energy storage system, and the household energy storage system of the invention will be further described with reference to the drawings and the embodiments in the specification.
As shown in fig. 1, the energy storage system of the present invention includes a solar power generation system, a battery system control unit, an energy storage inverter PCS, and an energy management system EMS.
The solar power generation system comprises a solar power generation module and an MPPT tracker connected with the solar power generation module; the battery system comprises at least one group of battery modules, wherein one group of battery modules is connected with a battery system control unit, and the battery system control unit is connected with the energy storage inverter PCS and the energy management system EMS; the energy storage inverter PCS comprises a microprocessor and a first bidirectional DC/AC converter, the solar power generation module is connected with the direct current end of the first bidirectional DC/AC converter through the MPPT tracker, the battery system is connected with the direct current end of the first bidirectional DC/AC converter through the first DC/DC converter, the alternating current end of the first bidirectional DC/AC converter is connected with a public power grid, and a node between the alternating current end of the first bidirectional DC/AC converter and the public power grid is connected with a user load.
Preferably, as shown in fig. 2, the battery system is connected to the AC terminal of the first bidirectional DC/AC converter through the second bidirectional DC/AC converter.
As shown in fig. 3, the battery module includes a plurality of serially connected single batteries, a battery management system BMS corresponding to the battery module one to one, and a temperature sensor, a fuse FR1, a contactor KM1, a shunt FL1, a heat dissipation fan and the like which are arranged in the battery module; the battery management system BMS is connected with a plurality of battery cells and gathers the battery cell voltage of the battery cell in the battery module, and the battery management system BMS is connected with the temperature sensor and gathers the temperature of the battery module.
Specifically, as shown in fig. 3, the battery module includes a positive output terminal DC + and a negative output terminal DC-, the positive output terminal DC + and the negative output terminal DC-are used for connecting a plurality of battery modules in parallel, the battery module is formed by connecting 14 single batteries in series, and the specification of each single battery is 3.7V/63 Ah; the positive electrode BAT + of the battery module is connected with the positive electrode output end DC + through a fuse FR1 and a contactor KM1 which are sequentially connected in series, and the negative electrode BAT-of the battery module is connected with the negative electrode output end DC-through a shunt FL 1; the positive electrode BAT + of the battery module is connected with the input end of the first DC/DC converter through a ship-shaped switch K2 and a fuse FR2 which are sequentially connected in series, the negative electrode BAT-of the battery module is connected with the input end of the first DC/DC converter, the output end of the first DC/DC converter is connected with a battery management system BMS to provide a working power supply for the battery management system BMS, the battery management system BMS is connected with a wake-up switch K4, the battery management system BMS is respectively connected with each single battery and is connected with a temperature sensor arranged in the battery module, preferably, the temperature sensors are multiple and are NTC temperature sensors. The battery management system BMS is ESBMM-1613R, the main chips are ML5238 and STM32F107, and the method for acquiring the state parameters, judging the fault type and reporting the energy storage inverter PCS of the energy storage system is executed, and the PCS is SolDate3700 TLc.
It should be noted that, as a preferred embodiment, the battery system control unit of the present invention is directly formed by the battery management systems BMS of the battery modules, the plurality of battery management systems BMS are connected to each other and can automatically perform master-slave identification to form the battery system control unit, no additional control chip is needed, one of the battery management systems BMS of the plurality of battery modules serves as a master to summarize the state parameters of the battery system and communicate with the energy storage inverter PCS, and the rest serves as a slave to provide the state parameter information to the master, so that the cost of the energy storage system can be reduced, and the present invention is particularly suitable for the household energy storage system.
When the battery system is only provided with one group of battery modules, a battery management system BMS connected with the battery modules forms a battery system control unit, automatically defaults to be a host, collects the state parameters of the battery system and communicates with an energy storage inverter PCS; when the battery system comprises a plurality of groups of battery modules which are connected in parallel, the battery management systems BMS automatically identify the addresses of a host computer/a slave computer, and the host computer is responsible for data aggregation and communication with the energy storage inverter PCS; when the battery module is accidentally separated, if the host is separated, other slave machines perform host/slave machine address recognition again to determine that the host is communicated with the energy storage inverter PCS, and if the slave machines are separated, the host automatically modifies the number of the slave machines to be communicated with the energy storage inverter PCS.
The following is one embodiment of a plurality of battery management systems BMS performing master/slave recognition when a battery system includes a plurality of sets of battery modules: one simulation host in the battery management systems BMS sends a test signal to other battery management systems BMS through the connecting network, the battery management systems BMS is larger than or equal to the preset overtime time and fails to receive data sent by other battery management systems BMS through the connecting network, then the battery management systems BMS judges that no battery management systems BMS host exists, then the battery management systems BMS automatically determines as the host and communicates with the energy storage inverter PCS, and other battery management systems BMS automatically determine as the slave. When the battery system increases or decreases the battery modules, the above process is repeated.
The battery management system BMS is respectively connected with each single battery of the battery module connected with the battery management system BMS, collects the voltage of each single battery, calculates the voltage of the battery module according to the voltage of each single battery, compares the collected voltage of each single battery with the voltage threshold of each single battery, and judges whether each single battery has low voltage of each single battery and high voltage of each single battery. The voltage of the single battery can be calculated through sampling signals at two ends of the single battery or realized through a voltage acquisition circuit or a special chip connected with the two ends of the single battery; when the voltage of the single battery is lower than the low voltage threshold value of the single battery, judging that the voltage low fault of the single battery exists; when the voltage of the single battery is higher than the high voltage threshold value of the single battery, judging that the single battery has a high voltage fault; the voltage value of each single battery in the battery module can be calculated to obtain the voltage value of each single battery in the battery module, and when the difference value of the highest single battery voltage and the lowest single battery voltage in the battery module exceeds the unbalanced threshold value of each single battery, the fault of the voltage unbalance of each single battery is judged to exist; the voltage value of each single battery of the module can be the average value of the voltage of each single battery, also can be a variance value, or is a median or is calculated by other modes; the battery management system BMS as the host collects the battery module voltages of all the battery modules to obtain the battery system voltage, compares the calculated battery system voltage with the battery system voltage threshold value, and judges whether the battery system has the faults of low battery system voltage and high battery system voltage.
Battery management system BMS passes through temperature sensor and gathers battery module temperature, and battery module temperature can be the average value of a plurality of temperature sensor temperatures of gathering, also can be the highest value, and battery management system BMS compares battery module temperature and battery module temperature threshold value, judges whether there is the trouble that battery module temperature is high, battery module temperature is low.
The battery management system BMS used as the host collects the battery module temperatures of all the battery modules to obtain the battery system temperature, compares the battery system temperature with the battery system temperature threshold value, and judges whether the battery system has the faults of high battery system temperature, low battery system temperature, high battery module temperature, low battery module temperature and large temperature difference between battery system areas. When the temperature of the battery system is lower than a low temperature threshold value of the battery system, determining that a low temperature fault of the battery system exists; when the temperature of the battery system is higher than a high threshold value of the temperature of the battery system, determining that a high temperature fault of the battery system exists; when the difference value between the temperature of each battery module and the temperature of the battery system exceeds the temperature difference threshold value, the fault that the temperature difference of the battery system is large is judged to exist, and the temperature of the battery system can be calculated by the mean value, the highest value, the median or other modes of the temperature of each battery module.
The battery management system BMS collects the battery module charging current and the battery module discharging current of the battery modules through a shunt FL1, the battery management system BMS as a host calculates the charging of the battery system according to the battery module charging current and the battery module discharging current of each battery module, the method comprises the steps of comparing the charging current of a battery system of the battery system with a charging current threshold of the battery system, comparing the discharging current of the battery system with a discharging current threshold of the battery system, judging whether the battery system has the fault of large charging current and large discharging current of the battery system, comparing the charging current of a battery module with the charging current threshold of the battery module, comparing the discharging current of the battery module with the discharging current threshold of the battery module, and judging whether the battery module has the fault of large charging current and large discharging current of the battery module.
The battery management system BMS detects the insulation internal resistance value through the R + insulation monitoring end and the R-insulation monitoring end, compares the insulation internal resistance value with an insulation value threshold value, and judges whether the battery module has a fault with a low insulation value, wherein the insulation value threshold value is preferably 500M omega. When any battery module has a fault and the insulation value is low, the battery management system BMS serving as the host reports the fault to the energy storage inverter PCS and reports the serial number of the battery module with the low insulation value and the fault.
The battery management system BMS detects the DC + end through the relay state, detects the DC-end through the relay state, and detects whether the voltages at the two ends of the contactor KM1 are consistent or not so as to judge whether the battery module has the problem of relay adhesion or not. When the relay adhesion exists in any battery module, the battery management system BMS serving as the host reports the battery module to the energy storage inverter PCS, and reports the serial number of the battery module with the relay adhesion fault.
Further, the battery management system BMS also has a temperature compensation function, and is used for compensating the discharge of the single battery at low temperature and dissipating heat of the battery module at high temperature. Preferably, battery management system BMS passes through control interface and links to each other with temperature control device, temperature control device includes radiator fan and heating mechanism, when the temperature of battery module exceedes its high temperature threshold value, radiator fan starts, be favorable to battery module's quick heat dissipation, when the temperature of battery module is less than its low temperature threshold value, heating mechanism starts, with the temperature that improves battery module, radiator fan and heating mechanism cooperate and use, make battery module keep working in the best operating temperature interval, be favorable to guaranteeing battery module's service capacity, the life of extension battery module. As shown in fig. 3, the battery management system BMS is connected to the cooling fan to control the start/stop of the cooling fan; when the temperature of the battery module is more than or equal to 28 ℃, the battery management system BMS controls the cooling fan to start, and when the temperature of the battery module is less than or equal to 25 ℃, the battery management system BMS controls the cooling fan to stop. It should be noted that the cooling fan of the temperature control device is a standard configuration of the distributed household energy storage system of the present invention; the heating mechanism can be selectively configured according to the use environment of a user, for example, in the south area of China, the heating mechanism is not needed if the overall environment temperature is high, and in the north area of China, the heating mechanism is needed if the temperature in winter is too low.
Further, the battery management system BMS further has a balancing control function for balancing the voltages of the individual batteries, and the specific method is as follows: and when the highest single battery voltage is detected to be higher than a certain value and pressure difference exists between the single batteries, balancing the single batteries in a current overpower internal resistance consumption mode.
As another embodiment of the battery system control unit, the battery system control unit is composed of a battery management system BMS of each battery module and an additional control chip, and the control chip is connected to each battery management system BMS, collects state parameters of the battery system and communicates with the energy storage inverter PCS.
The state parameters of the battery management system BMS of the energy storage system of the present invention include a battery system voltage, a battery system charging current, a battery system discharging current, a cell voltage, a remaining capacity SOC of the battery system, a battery system temperature, a battery module temperature, an insulation value of the battery system, a relay terminal voltage, and the like. The fault types comprise high voltage of a battery system, high voltage of a single battery, low voltage of the battery system, low voltage of the single battery, unbalanced voltage of the single battery, high temperature of the battery system, low temperature of the battery system, large temperature difference of the battery system, large charging current of the battery system, large discharging current of the battery system, low insulation value, relay adhesion and the like, and one fault type is related to one state parameter.
Further, the battery management system BMS sets a plurality of alarm levels for the same fault type, may set a plurality of different level thresholds for the same state parameter, performs a hierarchical alarm for the different level thresholds, and takes different measures. The battery management system BMS calculates the maximum chargeable/dischargeable current of the battery system in real time, judges the fault type and the alarm level of the energy storage system and reports the fault type and the alarm level to the energy storage inverter PCS, and the energy storage inverter PCS can control the charging/discharging of the battery system according to the maximum chargeable/dischargeable current, the fault type and the alarm level of the battery system.
When the energy storage system normally operates, the battery management system BMS collects the voltage of the single batteries of the battery module in real time, calculates the maximum chargeable current and the maximum dischargeable current of the battery module in real time according to the voltage of the single batteries, calculates the maximum chargeable current and the maximum dischargeable current of the battery system as the battery management system BMS of the host, reports the maximum chargeable current and the maximum dischargeable current to the energy storage inverter PCS, and the energy storage inverter PCS controls the actual charging current and the actual discharging current of the battery system not to exceed the maximum chargeable current and the maximum dischargeable current of the battery system reported by the battery system control unit. The method comprises the following specific steps:
the battery module is formed by connecting 14 single batteries in series, and the specification of the single batteries is 3.7V/63 Ah.
(10) The highest single battery voltage collected by the battery management system BMS is less than 4.1V, the maximum chargeable current reported to the energy storage inverter by the battery management system BMS is N x 72A, and N is the number of the battery modules;
(11) the highest single battery voltage collected by the battery management system BMS meets the condition that the highest single battery voltage is less than or equal to 4.1V and less than or equal to 4.12V, the maximum chargeable current reported to the energy storage inverter PCS by the battery management system BMS is N38A, and N is the number of the battery modules;
(12) the battery management system BMS reports that the energy storage inverter PCS stops charging if the highest single battery voltage falls below 4.12V, and determines the maximum chargeable current again according to the highest single battery voltage and reports the maximum chargeable current to the energy storage inverter PCS until the battery management system BMS detects that the battery system is discharged and the discharge capacity is more than 5% of the battery system capacity;
(20) the lowest single battery voltage collected by the battery management system BMS is larger than 3.5V, the maximum dischargeable current reported to the energy storage inverter PCS by the battery management system BMS is N72, and N is the number of the battery modules;
(21) the lowest single battery voltage collected by the battery management system BMS meets the condition that the lowest single battery voltage is not less than 3.4 and not more than 3.5V, the maximum dischargeable current reported to the energy storage inverter PCS by the battery management system BMS is N38A, and N is the group number of the battery modules;
(22) and if the lowest single battery voltage collected by the battery management system BMS is less than 3.4V, the battery management system BMS reports that the energy storage inverter PCS stops discharging, and if the lowest single battery voltage rises back to be more than 3.4V, the battery management system BMS still reports that the energy storage inverter PCS stops discharging until the battery management system detects that the system is charged and the charging capacity is more than 5% of the capacity of the battery system, the battery management system BMS determines the maximum dischargeable current again according to the lowest single battery voltage at the moment and reports the maximum dischargeable current to the energy storage inverter PCS.
If the energy storage system of the invention gives an alarm, the charging and discharging are carried out according to the rules corresponding to the alarm type and grade, and the specific rules are described in detail later.
The table I and the table II show that the energy storage system has various fault types, the alarm level of each fault type and the trigger threshold value of the alarm level, the energy storage inverter PCS controls the charging/discharging of the battery system under different alarm level states of different fault types, and the message action after the energy storage inverter PCS receives the message of the battery system control unit under different alarm level states of different fault types;
the system comprises a battery system, a battery pack, a battery system, a battery controller, a power supply and the like, wherein the battery system is high in voltage, the single battery system voltage is low, the single battery system temperature is high, the battery system temperature is large in temperature difference in battery system temperature, and the insulation value is low; the single battery voltage is unbalanced, and the fault types are classified into two levels of alarm, namely a second level alarm and a third level alarm due to different trigger thresholds; the fault type is three-level alarm, wherein the charging current is large, the discharging current is large, the relays are adhered; the battery system is low in temperature, and the faults are classified into a first-level alarm and a second-level alarm due to different trigger thresholds. When the energy storage system of the invention sends out a primary alarm, the PCS allows the charging/discharging of the battery system and can automatically recover from the fault state; when a secondary alarm is sent, if the fault type is that the voltage of the battery system is high, the voltage of the single battery is high, and the temperature of the battery system is high, the energy storage inverter PCS prohibits the charging/discharging of the battery system, if the fault type is that the voltage of the battery system is low, and the voltage of the single battery is low, the energy storage inverter permits the charging/prohibiting the discharging of the battery system, if the fault type is that the voltage of the single battery is unbalanced, the temperature difference of the battery system is large, and the insulation value is low, the energy storage inverter PCS prohibits the charging/discharging of the battery system, and if the fault type is that the temperature of the battery system is low, the energy storage inverter PCS permits the charging/discharging of the battery system; when a three-level alarm is given, the PCS prohibits the charging/discharging of the battery system and cannot automatically recover in a fault state. In particular, see the following table:
TABLE I (ambient temperature ≧ 10 ℃):
TABLE II (ambient temperature < 10 ℃):
note: in the above table, (1) "PCS derate (0.3C)" means that the energy storage inverter PCS charges and discharges the battery system at a current value obtained by 0.3 × 0.3 of the rated capacity of the energy storage system; (2) "cut-off relay" means cut-off contactor KM 1; (3) the temperature of the battery system is obtained based on the temperature of the battery module; (4) "PCS forced cut-off" means that the energy storage inverter PCS connected to the battery system cuts off a loop inside itself to disconnect; (5) "relay adhesion" means that contactor KM1 was adhered.
The battery system control unit composed of the battery management system BMS enters a sleep state beneficial to reducing power consumption under the following three conditions:
a. the communication interruption time of the battery system control unit and the energy storage inverter PCS is more than or equal to 5min, and the battery system control unit formed by the battery management system BMS enters a dormant state;
b. the lowest single battery voltage is less than 3.4V or the lowest battery module voltage is less than 47.6V, and the battery system control unit detects that the energy storage inverter PCS does not charge the battery system within 24 hours, and then the battery system control unit enters a sleep state;
c. and if the three-level alarm occurs and the duration time of the three-level alarm is more than or equal to 5min, the battery system control unit enters a dormant state.
When the battery system control unit enters the dormant state, the control contactor KM1 is disconnected, and the power is less than 0.1W.
After the battery system control unit enters the dormant state, the battery system control unit can be awakened in the following mode:
a1. when the battery system control unit is in a dormant state, the battery system control unit tries to read and analyze messages of the energy storage inverter PCS every 15s, and if a heartbeat instruction of the energy storage inverter PCS is read, the battery system control unit is awakened;
b1. because the three-level alarm and the duration time of the three-level alarm are more than or equal to 5min, the battery system control unit enters a dormant state, and the battery system control unit can only be awakened through the ship-shaped switch K2.
The power-on process of the battery system control unit is as follows:
firstly, the method comprises the following steps: the battery system comprises 1 group of battery modules, wherein the battery modules are connected with a battery management system BMS; when the system is powered on, the ship-shaped switch K2 is manually closed, the battery management system BMS detects the states of the battery pack, the battery pack is single, the battery pack end, the temperature and the like, and if the battery management system BMS is not in fault, the control contactor KM1 is closed.
II, secondly: the battery system comprises a plurality of battery modules which are connected in parallel, one battery module is connected with one battery management system BMS, and the plurality of battery management systems BMSs are connected through communication connectors; when the system is powered on, the power-on is delayed for 10s, the plurality of battery management systems BMSs automatically identify the addresses of the host computer/the slave computer, each battery management system BMS respectively detects the state of the corresponding battery module and sends the state to the battery management system BMS serving as the host computer, the battery management system BMS serving as the host computer judges that if the voltage difference between the battery modules is less than the power-on voltage difference threshold value of 3V and no fault type alarm exists, the contactor KM1 of the battery module is controlled to be closed by each battery management system BMS,
if the voltage difference between the battery modules is larger than the upper voltage difference threshold value of 3V, closing the contactor KM1 of the battery module with the lowest voltage and the contactor KM1 of the battery module with the lowest voltage difference smaller than the upper voltage difference threshold value of 3V, starting charging, and closing the contactors KM1 of the other battery modules after the voltage difference between the battery modules is smaller than the upper voltage difference threshold value of 3V and the voltage is high.
The starting-up process of the battery system control unit is as follows:
if the lowest single battery voltage collected by the battery system control unit is less than 3.4V and the energy storage inverter PCS does not charge the battery system within 24 hours (at the moment, the battery management system BMS judges that no input is input at the input end of the PCS, namely, no commercial power or photovoltaic state), the battery management system BMS automatically enters a dormant state and the contactor KM1 is disconnected; if the lowest single battery voltage collected by the battery system control unit is less than 3.4V, the energy storage inverter charges the battery system within 24 hours, the battery management system BMS keeps the contactor KM1 closed, and the energy storage system enters a normal charging state.
Preferably, the battery management system is connected with the energy storage inverter PCS and the energy management system EMS in a CAN communication mode or an RS485 communication mode for communication.
Further, the energy storage system also comprises an indicator light group for indicating the states of the battery system and the electromagnetic module, and the battery management system BMS of the battery module is respectively connected with the indicator light group. The battery management system BMS controls the working state of the indicating lamp set, including lighting rules, indicating lamp set light colors and the like, so that a user can visually check the running state of the battery system 1 through the indicating lamp set, and the battery management system BMS is favorable for the user to find problems and process the problems in time
As shown in fig. 3 and 4, the lamp module includes a lamp board connected to the BMS and a plurality of lamps connected to the lamp board. The indicator lamp panel comprises a signal input end and a power input end, the signal input end comprises a CAN1H signal input end and a CAN signal input end, the power input end comprises a 12 or 24V positive electrode input end and a GND grounding end, and the indicator lamp panel is connected with corresponding pins on the battery management system BMS through the signal input end and the power input end. c. C
As shown in fig. 4, the BMS may control the indicating lamp sets according to the operation state of the battery system 1 as follows: the indicating lamp group comprises 20 indicating lamps which are linearly arranged from left to right, and the 20 indicating lamps are respectively No. 1-20 from left to right.
State one, (1) lighting rule: after a user closes the ship-shaped switch K2, the BMS is electrified for self-checking, 20 indicator lamps of the indicator lamp set are controlled to emit light and flicker for 15 seconds, and the flicker time interval is 1 second; (2) color of the light: green;
state two, (21) lighting rule: the PCS controls the battery system 1 to be normally charged, the BMS enables N indicator lamps of the indicator lamp set to be turned on one by one, the lighting time interval is 0.5 second, the number N of the turned-on indicator lamps corresponds to the real-time residual electric quantity SOC of the battery system 1, after all the N indicator lamps are turned on, the N indicator lamps are kept for 1 second and then turned off, and the process is repeated; (22) color of the light: green; (23) example (c): as shown in fig. 2, the PCS controls the battery system 1 to be normally charged, the BMS controls the 16 indicator lamps to be turned on, the numbers 1 to 16 are sequentially turned on from left to right at an interval of 0.5 seconds, after the number 16 indicator lamp is turned on, the 16 indicator lamps are kept on for 1 second and are all turned off for 1 second, and the above processes are repeated.
State three, (31) lighting rule: the PCS controls the battery system 1 to normally discharge, at the beginning, the BMS controls N indicator lamps of the indicator lamp set to be all lighted, the number N of the lighted indicator lamps corresponds to the real-time residual electric quantity SOC of the battery system 1, then the indicator lamps are turned off one by one, the turning-off time interval is 0.5 second, after the N indicator lamps are all turned off, the state is kept for 1 second, and the process is repeated; (32) color of the light: green; (33) example (c): as shown in fig. 2, the PCS controlled battery system 1 discharges normally, 16 indicators 1 to 16 are all turned on, then the 16 indicators are sequentially turned off from the indicator No. 16 to the indicator No. 1 at an off interval of 0.5 second, and after all the indicators are turned off, the PCS is kept off for 1 second, and the above process is repeated.
State four, (41) lighting rule: and in the dormant state or the energy-saving state, the BMS controls all the indicator lamps of the indicator lamp group to be turned off.
State five
In the alarm state, the BMS may control the operating states of the display lamps of the display lamp group according to the difference in the fault type and the alarm level, as shown in the following table:
when the ambient temperature is less than or equal to 10 ℃, the working state of the indicating lamp group in the fifth state is corrected, and the following table is specifically adopted:
the foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (16)
1. An energy storage system, characterized by: the system comprises a battery system, a battery system control unit connected with the battery system and an energy storage inverter PCS; the battery system comprises a plurality of groups of battery modules, each battery module comprises a plurality of single batteries connected in series and a battery management system BMS corresponding to the battery modules one to one; the battery system control unit is connected with the energy storage inverter PCS;
the battery system control unit acquires state parameters of the battery system, judges the fault type of the battery system according to the state parameters and reports the fault type to the energy storage inverter PCS, and the energy storage inverter PCS controls the charging/discharging of the battery system according to the fault type;
the battery management systems BMSs are connected with each other and can automatically identify a master machine and a slave machine to form a battery system control unit, one of the battery management systems BMSs of the battery modules is used as a master machine to collect state parameters of the battery system and is communicated with the energy storage inverter PCS, and the rest of the battery management systems BMSs are used as slave machines and provide state parameter information for the master machine;
and when the battery module is accidentally separated, if the host is separated, other slave machines carry out the host/slave machine address recognition again, the communication between the host and the energy storage inverter PCS is determined, and if the slave machines are separated, the host automatically modifies the number of the slave machines and communicates with the energy storage inverter PCS.
2. The energy storage system of claim 1, wherein: the battery system comprises a battery module and a battery management system BMS corresponding to the battery module, wherein the battery management system BMS forms a battery system control unit, and the battery management system BMS is used as a host for summarizing state parameters of the battery system and communicating with the energy storage inverter PCS.
3. The energy storage system of claim 1, wherein: the battery management system BMS passes through temperature sensor and gathers the battery module temperature of each battery module, and the battery management system BMS who is the host computer judges whether there is the big trouble of battery system difference in temperature of energy storage system according to the battery module temperature of a plurality of battery modules of gathering.
4. The energy storage system of claim 1, wherein: the battery management system BMS is respectively connected with each single battery of the battery module connected with the battery management system BMS, collects the voltage of each single battery, calculates the voltage of the battery module and the voltage value of the single battery of the module according to the voltage of the single battery, and judges whether the voltage imbalance fault of the single battery exists or not by comparing the voltage of the single battery with the voltage value of the single battery of the module;
the battery management system BMS has a balance control function, and when the highest single battery voltage is detected to be higher than a certain value and pressure difference exists among the single batteries, the single batteries are balanced in a mode of consuming through current overpower internal resistance.
5. The energy storage system according to claim 1 or 2, characterized in that:
the battery management system BMS is respectively connected with each single battery of the battery module connected with the battery management system BMS, collects the voltage of each single battery, calculates the voltage of the battery module according to the voltage of each single battery, compares the collected voltage of each single battery with the voltage threshold of each single battery, and judges whether the single battery has the faults of low voltage of each single battery and high voltage of each single battery; the battery management system BMS used as the host machine collects the voltages of the battery modules of all the battery modules to obtain the voltage of the battery system, compares the calculated voltage of the battery system with the voltage threshold value of the battery system and judges whether the battery system has the faults of low voltage of the battery system and high voltage of the battery system;
and/or the battery management system BMS collects the charging current and the discharging current of the battery modules through a current divider FL1, calculates the charging current and the discharging current of the battery system according to the charging current and the discharging current of the battery modules, compares the charging current of the battery system with the charging current threshold of the battery system, compares the discharging current of the battery system with the discharging current threshold of the battery system, and judges whether the battery system has the faults of large charging current and large discharging current;
and/or, battery management system BMS passes through temperature sensor and gathers battery module temperature, judges whether there is the trouble that battery module temperature is high, battery module temperature is low, gathers the battery module temperature of all battery modules as the battery management system BMS of host computer and obtains the battery system temperature, judges whether the battery system has the trouble that battery system temperature is high, battery system temperature is low.
6. The energy storage system of claim 1, wherein:
the battery management system BMS detects the insulation internal resistance value of the energy storage system through the R + insulation monitoring end and the R-insulation monitoring end of the battery management system BMS, and judges whether the energy storage system has a fault with a low insulation value or not according to the collected insulation internal resistance value;
and/or, the battery management system BMS detects whether the battery module has the fault of relay adhesion.
7. The energy storage system of claim 1, wherein:
the battery system control unit sets a plurality of alarm levels for the same fault type, sets a plurality of different level thresholds for the same state parameter, and performs graded alarm for the different level thresholds.
8. The energy storage system of claim 1, wherein:
the battery system control unit calculates the maximum chargeable current and the maximum dischargeable current of the battery system in real time and reports the maximum chargeable current and the maximum dischargeable current to the energy storage inverter PCS, and the energy storage inverter PCS controls that the actual charging current and the actual discharging current of the battery system do not exceed the maximum chargeable current and the maximum dischargeable current of the battery system reported by the battery system control unit.
9. The energy storage system of claim 8, wherein:
the highest single battery voltage < a acquired by the battery management system BMS is obtained, the maximum chargeable current reported to the energy storage inverter PCS by the battery system control unit is N x 72A, and N is the number of the battery modules;
the battery management system BMS acquires the highest single battery voltage, and the highest single battery voltage a is not more than b, the maximum chargeable current reported to the energy storage inverter PCS by the battery system control unit is N38A, N is the number of battery modules, a and b are preset protection thresholds, and a is less than b;
and if the highest single battery voltage collected by the battery management system BMS is greater than b, the battery system control unit reports that the energy storage inverter PCS stops charging, and if the highest single battery voltage falls below b, the battery system control unit still reports that the energy storage inverter PCS stops charging until the battery system control unit detects that the battery system discharges and the discharge capacity is greater than 5% of the battery system capacity, the battery system control unit determines the maximum chargeable current again according to the collected highest single battery voltage and reports the maximum chargeable current to the energy storage inverter PCS.
10. The energy storage system of claim 8, wherein:
if the lowest single battery voltage collected by the battery management system BMS is greater than c, the maximum dischargeable current reported to the energy storage inverter PCS by the battery system control unit is N x 72A, and N is the number of battery modules;
the lowest single battery voltage collected by the battery management system BMS meets the condition that d is less than or equal to the lowest single battery voltage and is less than or equal to c, the maximum dischargeable current reported to the energy storage inverter PCS by the battery system control unit is N38A, N is the number of battery modules, a and b are preset protection thresholds, and d is less than c;
and if the lowest single battery voltage collected by the battery management system BMS is less than d, the battery system control unit reports the energy storage inverter PCS to stop discharging, and if the lowest single battery voltage rises back to a value above d, the battery system control unit still reports the energy storage inverter PCS to stop discharging until the battery system control unit detects that the battery system is charged and the charging capacity is greater than 5% of the capacity of the battery system, the battery system control unit determines the maximum dischargeable current according to the collected lowest single battery voltage and reports the maximum dischargeable current to the energy storage inverter PCS.
11. The energy storage system of claim 1, wherein:
when the battery management system BMS is electrified and is delayed, the plurality of battery management systems BMS automatically identify the master and the slave, each battery management system BMS respectively detects the state of the corresponding battery module and sends the state to the battery management system BMS as a host, the battery management system BMS as the host judges that if the voltage difference between the battery modules is less than the upper voltage difference threshold value and no fault type alarm exists, the battery management system BMS controls the contactor KM1 of the battery module to be closed,
if the voltage difference between the battery modules is larger than the voltage difference threshold value, the contactor KM1 of the battery module with the lowest voltage and the contactor KM1 of the battery module with the lowest voltage difference smaller than the voltage difference threshold value are closed, charging is started, and after the voltage difference between the battery modules is smaller than the voltage difference threshold value, the contactors KM1 of the other battery modules are closed.
12. The energy storage system of claim 11, wherein:
the lowest single battery voltage < e acquired by the battery system control unit, and the energy storage inverter PCS does not charge the battery system within time T, the battery management system BMS automatically enters a sleep state and the contactor KM1 is turned off;
and/or the battery system control unit acquires the lowest single battery voltage < e, the energy storage inverter charges the battery system within the time T, and the battery management system BMS keeps the contactor KM1 closed.
13. The energy storage system of claim 1, wherein: the battery modules comprise a positive electrode output end DC + and a negative electrode output end DC-, the positive electrode output end DC + and the negative electrode output end DC-are used for connecting a plurality of battery modules in parallel, a positive electrode BAT + of each battery module is connected with the positive electrode output end DC + through a fuse FR1 and a contactor KM1 which are sequentially connected in series, and a negative electrode BAT-of each battery module is connected with the negative electrode output end DC-through a shunt FL 1; the positive electrode BAT + of the battery module is connected with the input end of the first DC/DC converter through a ship-shaped switch K2 and a fuse FR2 which are sequentially connected in series, the negative electrode BAT-of the battery module is connected with the input end of the first DC/DC converter, the output end of the first DC/DC converter is connected with a battery management system BMS to provide a working power supply for the battery management system BMS, the battery management system BMS is connected with a wake-up switch K4, and the battery management system BMS is respectively connected with each single battery and is connected with a temperature sensor arranged in the battery module.
14. The energy storage system of claim 13, wherein: the battery management system BMS is connected with the temperature control device through the control interface, the temperature control device comprises a cooling fan and a heating mechanism, when the temperature of the battery module exceeds a high-temperature threshold value, the cooling fan is started, the quick heat dissipation of the battery module is facilitated, and when the temperature of the battery module is lower than a low-temperature threshold value, the heating mechanism is started.
15. The energy storage system of claim 1, wherein: the battery management system BMS is connected with the indicating lamp set, provides working power supply for the indicating lamp set and controls the working state of the indicating lamp set.
16. The energy storage system of claim 15, wherein: the indicating lamp set includes an indicating lamp electric plate connected with the battery management system BMS and a plurality of indicating lamps connected with the indicating lamp electric plate.
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| CN111799828A (en) * | 2020-05-28 | 2020-10-20 | 珠海格力电器股份有限公司 | Energy storage operation control method and device |
| CN112152243A (en) * | 2020-08-21 | 2020-12-29 | 北京双登慧峰聚能科技有限公司 | Lithium battery energy storage system and control method |
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