CN114744719A - Protection method, device and system for energy storage management system - Google Patents
Protection method, device and system for energy storage management system Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 95
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- 238000012544 monitoring process Methods 0.000 claims abstract description 29
- 239000000178 monomer Substances 0.000 claims abstract description 19
- 230000002159 abnormal effect Effects 0.000 claims description 22
- 238000003860 storage Methods 0.000 claims description 18
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- 230000003068 static effect Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 description 23
- 238000010586 diagram Methods 0.000 description 16
- 238000004590 computer program Methods 0.000 description 11
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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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
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge 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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or 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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00309—Overheat or overtemperature protection
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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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- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The application discloses a protection method, a device and a system for an energy storage management system, wherein the energy storage management system comprises a battery pack, a control unit and a PCS, and the method comprises the following steps: monitoring an electric energy parameter in each battery monomer in the battery pack; and issuing a preset control instruction to enable the connection switch unit to execute a corresponding protection action according to the condition of the electric energy parameter in a preset scene. Through this application realization to energy storage management system's automatic protection that can resume, when having solved the battery charge-discharge out of control that PCS gave the group battery effectively, can't effectively break off and bring the safety risk to and if a certain battery cell appears overcharging, inefficacy in the group battery, faults such as excess temperature can't effectively break off and bring a great deal of safety risk scheduling problem for energy storage system.
Description
Technical Field
The application relates to the technical field of energy management of a contact system, in particular to a protection method, a device and a system for an energy storage management system.
Background
In an energy storage system, battery equalization is an indispensable part of a BMS system, and plays a role in reducing the difference of battery cores of the whole system, the equalization efficiency also determines the efficiency of the whole system, and the active and passive equalization systems are more and more commonly applied at the same time.
In the related technology, the active and passive equalization system in the energy storage management system combines the advantages of low cost, space saving and easy realization of passive equalization, and the advantages of high equalization speed, low energy loss, low heat accumulation and the like of the active equalization technology. However, due to the complex control and high cost of the technical scheme, if a single battery in the battery pack has faults of overcharge, failure, over-temperature and the like and is not timely disconnected with the battery pack, important devices of the active and passive balance controllers can be punctured or plates are completely damaged and cannot be used, and even the battery pack is on fire and fails to damage the whole energy storage system. Not only causes irrecoverable economic loss, but also brings immeasurable safety risks to personnel, equipment, environment and the like.
Disclosure of Invention
The embodiment of the application provides a protection method, a device and a system for an energy storage management system, so as to realize recoverable automatic protection of the energy storage management system.
The embodiment of the application adopts the following technical scheme:
in a first aspect, an embodiment of the present application provides a protection method for an energy storage management system, where the energy storage management system includes a battery pack, a control unit, and a PCS, and the method includes: monitoring an electric energy parameter in each battery monomer in the battery pack; and issuing a preset control instruction to enable the connection switch unit to execute corresponding protection actions according to the condition that the electric energy parameters are in the preset scene.
In a second aspect, an embodiment of the present application further provides a protection device for an energy storage management system, where the energy storage management system includes a battery pack, a control unit, and a PCS, and the device includes: the monitoring module is used for monitoring the electric energy parameters in each single battery in the battery pack; and the protection module is used for issuing a preset control instruction according to the condition of the electric energy parameter in a preset scene so as to enable the connection switch unit to execute a corresponding protection action.
In a third aspect, an embodiment of the present application further provides a protection system for an energy storage management system, where the energy storage management system includes a battery pack, an active equalization control unit, a passive equalization control unit, and a PCS, and the system includes: the main control unit is used for feeding back the electric energy parameters in each battery monomer in the battery pack to the energy storage management system after processing the electric energy parameters, and receiving a preset control instruction sent by the energy storage management system so as to control the connection switch unit to execute corresponding protection actions; the connection switch unit is used for executing an active equalization strategy or a passive equalization method strategy to perform equalization processing by switching on or off the control switch, and disconnecting the control unit from the battery pack and disconnecting the PCS from the battery pack if a safety risk occurs; a control unit connector comprising: the active equalization connector is connected with the active equalization control unit and the battery pack; the passive equalization connector is connected with the passive equalization control unit and the battery pack; and the PCS connector is used for connecting the PCS and the battery pack and charging and discharging the battery pack through the PCS.
In a fourth aspect, an embodiment of the present application further provides an electronic device, including: a processor; and a memory arranged to store computer executable instructions that, when executed, cause the processor to perform the above method.
In a fifth aspect, embodiments of the present application further provide a computer-readable storage medium storing one or more programs which, when executed by an electronic device including a plurality of application programs, cause the electronic device to perform the above-mentioned method.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
the method comprises the steps of monitoring electric energy parameters in each battery cell in the battery pack and issuing a preset control instruction according to the condition of the electric energy parameters in a preset scene so as to enable a connection switch unit to execute corresponding protection actions. The problems that safety risks are caused due to the fact that the PCS cannot be effectively disconnected when the charging and discharging of the battery pack are out of control, and many safety risks are caused due to the fact that a single battery in the battery pack cannot be effectively disconnected if faults such as overcharge, invalidation and over-temperature occur.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic flowchart of a protection method for an energy storage management system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a protecting device for an energy storage management system according to an embodiment of the present application;
fig. 3 is a schematic diagram of an internal structure of a protection system for an energy storage management system according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an apparatus of an energy storage system in an embodiment of the present application;
FIG. 5 is a schematic diagram illustrating a protection method for an energy storage management system according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of an electronic device in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The PCS is a battery charging and discharging device, namely an energy storage converter, a Power Conversion System and can control the charging and discharging processes of a storage battery, perform alternating current and direct current Conversion and directly supply Power to alternating current loads under the condition of no Power grid. In general, the PCS is constituted by a DC/AC bidirectional converter, a control unit, and the like.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
An embodiment of the present application provides a protection method for an energy storage management system, and as shown in fig. 1, a flow diagram of the protection method for the energy storage management system in the embodiment of the present application is provided, where the method at least includes the following steps S110 to S120:
step S110, monitoring an electric energy parameter in each battery cell in the battery pack.
The monitoring process mainly collects the electric energy parameters in each battery monomer in the battery pack, carries out relevant operation on the collected electric energy parameters and feeds the electric energy parameters back to the energy storage management system.
And step S120, issuing a preset control instruction to enable the connection switch unit to execute a corresponding protection action according to the condition of the electric energy parameter in a preset scene.
During specific implementation, according to the condition of the electric energy parameter under different preset scenes, a preset control instruction can be issued to control the connection switch unit to execute corresponding protection operation actions.
Further, the issuing of the preset control is used for controlling the on-off condition between the battery pack and the PCS and between the battery pack and the (equalization) control unit.
It should be noted that the equalization control unit includes an active equalization control unit and a passive equalization control unit.
In an embodiment of the application, issuing a preset control instruction to enable a connection switch unit to execute a corresponding protection action according to the condition of the electric energy parameter in a preset scene includes: and issuing a preset control instruction according to the condition of the electric energy parameter in a preset scene so as to adjust the circuit in the connection switch unit and/or change the on-off state in the connection switch unit.
In specific implementation, the circuit protection action in the connection switch unit includes, but is not limited to, changing a route in the circuit connection switch unit and changing an on-off state of the circuit. That is to say, according to the condition that the electric energy parameter is in the preset scene, a preset control instruction is issued to adjust the line in the connection switch unit, corresponding to the enabled balancing strategy.
Furthermore, according to the condition that the electric energy parameter is in a preset scene, a preset control instruction is issued to change the on-off state in the connection switch unit, namely the on-off state or the open-circuit state of the connection switch unit.
In one embodiment of the present application, the on/off state in the circuit connection switch unit includes at least one of the following states: the control unit is connected with the battery pack in an on-off state, wherein the control unit comprises an active balance control unit and a passive balance control unit; and the positive and negative electrodes of the PCS and the positive and negative electrodes of the battery pack are in on-off state.
During specific implementation, the on-off state of the active balance control unit connected with the battery pack, the on-off state of the passive balance control unit connected with the battery pack, and the on-off states of the positive and negative electrodes of the PCS of the battery charging and discharging device and the positive and negative electrodes of the battery pack.
In an embodiment of the application, issuing a preset control instruction to enable a connection switch unit to execute a corresponding protection action according to the condition of the electric energy parameter in a preset scene includes: and when the residual capacity difference value between different battery packs is larger than a first preset threshold value, issuing a first preset control instruction, closing a first switch group in the connection switch unit and opening a second switch group in the circuit connection switch unit so as to execute a protection action corresponding to active equalization.
As shown in fig. 5, in specific implementation, when it is monitored that the remaining capacity difference between different battery packs is greater than a set threshold, the energy storage system issues a control instruction and generates a control signal through the main control unit, and the corresponding control switches of S0, S1, S2, k..., Sm-1, Sm are closed, so that all the control switches of K0, K1, K2, k..., Km-1, Km are simultaneously opened, thereby implementing an active equalization method strategy in the energy storage system.
A first switch set including S0, S1, S2, Sm-1, Sm.
A first switch set including K0, K1, K2.
In an embodiment of the application, the issuing a preset control instruction to enable the connection switch unit to execute a corresponding protection action according to the condition that the electric energy parameter is in a preset scene includes: and when the residual capacity difference value between different single batteries in the battery pack is larger than a second preset threshold value, issuing a second preset control instruction, closing a second switch group in the connection switch unit, and disconnecting a first switch group in the circuit connection switch unit to execute a protection action corresponding to passive equalization.
As shown in fig. 5, in specific implementation, when it is monitored that the residual capacity difference between different battery cells in the battery pack is greater than a set threshold, the energy storage management system issues a control instruction and generates a control signal through the main control unit, and closes the control switches K0, K1, K2,.., Km-1, Km, wherein the corresponding control switches simultaneously open all the control switches S0, S1, S2,..., Sm-1, Sm, so as to implement a passive equalization method strategy in the energy storage system.
In one embodiment of the present application, the monitoring the electric energy parameter in each battery cell in the battery pack includes: monitoring that the battery capacity of any one battery monomer in the battery pack reaches a preset capacity threshold value, and feeding back an abnormal charging state; the issuing of the preset control instruction to enable the connection switch unit to execute the corresponding protection action according to the condition of the electric energy parameter in the preset scene comprises the following steps: when the charging state of any one of the battery cells in the battery pack is abnormal, issuing a third preset control instruction, disconnecting a third switch group and a first switch group in the connection switch unit, and closing a preset switch in the second switch group to execute a protection action corresponding to temperature protection, wherein the third switch group comprises a control switch connected with the PCS, the preset switch in the second switch group comprises a part of switches connected with the passive equalization connector, the second switch group comprises a control switch connected with the passive equalization connector, and the first switch group comprises a control switch connected with the active equalization connector; and when the charging state of any one of the battery monomers in the battery pack is not abnormal, disconnecting the preset switch in the second switch group and simultaneously closing the control switch in the third switch group.
As shown in fig. 5, in specific implementation, when the system monitors that the charging state of any battery cell of the battery pack is abnormal, taking C2 as an example, if the battery cell C2 is overcharged, the CPU control unit (main control unit) monitors that the battery capacity of the battery cell C2 has reached a set capacity threshold, and feeds back information to the energy storage control system, and at the same time, the CPU control unit (main control unit) issues an instruction to automatically disconnect the control switches KM1 and KM2 connected to the charging and discharging PCS device, and automatically disconnect all the control switches S0, S1, S2, Sm-1, Sm, and close the control switches K1 and K2 to perform a passive equalization strategy, and when the battery capacity of the battery cell C2 reaches a normal capacity value, disconnect the control switches K1 and K2. At this time, the control switches KM1 and KM2 connected to the charging and discharging PCS device are automatically closed and the monitoring result is fed back to the energy storage management system, so that the system operates normally.
And a third switch group including KM1 and KM 2.
In one embodiment of the present application, the monitoring the electric energy parameter in each battery cell in the battery pack includes: monitoring that the battery temperature of any one battery monomer in the battery pack reaches a preset temperature threshold value, and feeding back an abnormal charging state; the issuing of a preset control instruction to execute a corresponding protection action according to the condition of the electric energy parameter in a preset scene comprises the following steps: when the temperature state of any one of the single batteries in the battery pack is abnormal, issuing a fourth preset control instruction, and disconnecting a third switch group, a second switch group and the first switch group in the connection switch unit; and when the temperature state of any one of the battery monomers in the battery pack is not abnormal, restarting the energy storage management system, and closing the third switch group at the same time.
As shown in fig. 5, in specific implementation, when the system monitors that the temperature state of any battery cell of the battery pack is abnormal, still taking C2 as an example, if the temperature of the battery cell C2 is abnormal, the CPU control unit monitors that the battery temperature T2 of the battery cell C2 has reached a set temperature threshold, and feeds back information to the energy storage control system, and at the same time issues an instruction to automatically disconnect the control switches KM1 and KM2 connected to the charging and discharging PCS device, and automatically disconnect all the control switches S0, S1, S2, Sm-1, Sm connected to the active equalization control unit, and automatically disconnect all the control switches K0, K1, K2, KM-1, KM connected to the passive equalization control unit. The battery pack failure caused by abnormal temperature is avoided, even the whole energy storage system is influenced by the fire of the battery, the loss is reduced to the minimum, and the energy storage system can be restarted after the corresponding abnormal battery is checked and maintained by a worker. At this time, the control switches KM1 and KM2 connected to the charging and discharging PCS device are automatically closed, and simultaneously receive the corresponding active and passive equalization strategies, and the corresponding control switches are automatically closed to implement the active and passive equalization strategies.
The embodiment of the present application further provides a protection device 200 for an energy storage management system, and as shown in fig. 2, a schematic structural diagram of the protection device for the energy storage management system in the embodiment of the present application is provided, where the protection device 200 for the energy storage management system at least includes: a monitoring module 210 and a protection module 220, wherein:
in an embodiment of the present application, the monitoring module 210 is specifically configured to: the monitoring process mainly collects electric energy parameters in each battery monomer in the battery pack, carries out related operation on the collected electric energy parameters and feeds the electric energy parameters back to the energy storage management system.
In an embodiment of the present application, the monitoring module 220 is specifically configured to: according to the condition of the electric energy parameters under different preset scenes, a preset control instruction can be issued to control the connection switch unit to execute corresponding protection operation actions.
Further, the issuing of the preset control is used for controlling the on-off condition between the battery pack and the PCS and between the battery pack and the (equalization) control unit.
It should be noted that the equalization control unit includes an active equalization control unit and a passive equalization control unit.
As shown in fig. 3, an embodiment of the present application further provides a protection system for an energy storage management system, where the energy storage management system includes a battery pack 3013, an active equalization control unit 3014, a passive equalization control unit 3012, and a PCS3011, and the protection system includes:
the main control unit 3021 is configured to feed back the processed electric energy parameters of each battery cell in the battery pack to the energy storage management system and receive a preset control instruction issued by the energy storage management system, so as to control the connection switch unit to execute a corresponding protection action;
a connection switch unit 3022 configured to perform equalization processing by turning on or off the control switch to execute an active equalization strategy or a passive equalization method strategy, and disconnect the control unit from the battery pack and the PCS from the battery pack if a safety risk occurs;
a control unit connector 3023 including: the active equalization connector is connected with the active equalization control unit and the battery pack; the passive equalization connector is connected with the passive equalization control unit and the battery pack;
a PCS connector 3024 for connecting the PCS and the battery pack to charge and discharge the battery pack through the PCS.
It can be understood that, the protection device for an energy storage management system described above can implement the steps of the protection method for an energy storage management system provided in the foregoing embodiment, and the explanations regarding the protection method for an energy storage management system are applicable to the protection device for an energy storage management system, and are not described herein again.
As shown in fig. 4 and 5, the method in the embodiment of the present application is applied to a mechanism capable of recovering automatic protection between a battery pack and a charging and discharging PCS device and between the battery pack and a balancing control unit in an energy storage management system, and can effectively solve the problems that when a charging and discharging main loop is out of control for charging and discharging a battery, a safety risk is brought due to the fact that the battery cannot be effectively disconnected, and if a single battery in the battery pack has faults such as overcharge, failure, and over-temperature, a plurality of safety risks are brought to the energy storage system due to the fact that the battery cannot be effectively disconnected.
In specific implementation, as shown in fig. 3, the energy storage management system includes a battery pack 3013, an active equalization control unit 3014, a passive equalization control unit 3012, and a PCS 3011.
As shown in fig. 3, the protection system includes: the main control unit 3021 is configured to feed back the electric energy parameters in each battery cell in the battery pack to the energy storage management system after processing the electric energy parameters, and receive a preset control instruction issued by the energy storage management system, so as to control the connection switch unit to execute a corresponding protection action; a connection switch unit 3022 configured to perform equalization processing by turning on or off the control switch to execute an active equalization strategy or a passive equalization method strategy, and disconnect the control unit from the battery pack and the PCS from the battery pack if a safety risk occurs; a control unit connector 3023 including: the active equalization connector is connected with the active equalization control unit and the battery pack; the passive equalization connector is connected with the passive equalization control unit and the battery pack; a PCS connector 3024 for connecting the PCS and the battery pack to charge and discharge the battery pack through the PCS.
Wherein, the first and the second end of the pipe are connected with each other,
the main control unit 3021 is a low-cost and high-efficiency microprocessor, and performs operation processing on the collected electrical parameters, feeds the electrical parameters back to the energy storage management system, and receives an instruction issued by the energy storage management system to control the action requirement of the connection switch unit.
The connection switch unit 3022 implements the equalization processing by applying an active equalization method strategy or applying a passive equalization method strategy by turning on or off the switch; if the safety risk occurs, the connection between the active and passive equalization units and the battery pack can be disconnected in time, and the connection between the charging main loop and the battery pack can be disconnected.
The battery pack connector connects the battery pack with the device of the invention through a connecting wire.
The control unit connector 3023 includes an active equalization connector that connects the battery pack to the apparatus of the present invention through a connection line and implements an active equalization method strategy by receiving an instruction, and a passive equalization connector that connects the battery pack to the apparatus of the present invention through a connection line and implements a passive equalization method strategy by receiving an instruction.
The PCS connector 3024 connects the positive and negative electrodes of the battery charging and discharging device PCS with the protection system through a connection line, so that the PCS can charge the battery pack.
In one embodiment of the present application, the system further comprises: a temperature acquisition unit, a battery pack connector and a power supply unit,
the battery pack connector is used for connecting the battery pack.
The temperature acquisition unit is used for monitoring the temperature of each battery monomer in the battery pack in the running state or the static state in real time and feeding data back to the control unit for processing;
and the power supply unit is used for supplying power to the control unit and the connecting switch unit.
In specific implementation, the power supply unit provides continuous and reliable electric energy to the main control unit 3021 and the connection switch unit 3022, so that the main control unit 3021 and the connection switch unit can be in an efficient and stable working state. The temperature acquisition unit is used for monitoring the temperature of the battery cell in the running state or the static state in real time and feeding data back to the CPU control unit (main control unit) for processing.
In order to better understand the protection method for the energy storage management system, the following explains the technical solutions with reference to preferred embodiments, but the technical solutions of the embodiments of the present invention are not limited.
The protection method for the energy storage management system in the embodiment of the application effectively solves the problems that safety risks are brought to the energy storage system due to the fact that when the PCS is out of control in charging and discharging of the battery pack, the PCS cannot be effectively disconnected, and if faults such as overcharge, invalidation and over-temperature occur to a single battery in the battery pack, a great number of safety risks are brought to the energy storage system due to the fact that the single battery cannot be effectively disconnected.
As shown in fig. 4 and 5, the protection system for the energy storage management system includes: the battery pack management system comprises a connection unit circuit, wherein the connection unit circuit is provided with a battery pack connector, an active equalization connector, a passive equalization connector and a PCS (Power distribution System) charging and discharging main loop connector, the battery pack connector is used for connecting battery pack cells of the energy storage management system, the active equalization connector is used for connecting an active equalization control unit in the energy storage management system, the passive equalization connector is used for connecting a passive equalization control unit in the energy storage management system, and the PCS charging and discharging main loop connector is used for connecting the positive electrode and the negative electrode of a PCS of a battery charging and discharging device.
In the energy storage system equipment, an active equalization connector in a protection system is connected with an active equalization control unit in an energy storage management system, a passive equalization connector is connected with a passive equalization control unit in the energy storage management system, a battery pack connector is connected with a battery pack of the energy storage system, a PCS (personal computer system) charging and discharging main loop connector is connected with a positive bus and a negative bus of a PCS (personal computer) charging and discharging power unit, a temperature acquisition unit is connected with a temperature acquisition chip on a battery monomer, and a CPU (central processing unit) control unit interface is connected with a main controller of the energy storage management system.
As shown in fig. 5, on the basis of the above embodiment, the CPU control unit performs operation processing on the collected electrical parameters, feeds back the electrical parameters to the energy storage management system, and receives an instruction issued by the energy storage management system to control the action requirement of the connection switch unit, which is specifically as follows:
when the system monitors that the residual capacity difference between different battery packs is larger than a set threshold value, the energy storage system issues a control instruction and generates a control signal through a CPU control unit, and the control switches of all K0, K1, K2, Km-1 and Km are simultaneously opened by corresponding control switches of S0, S1, S2.
When the protection system monitors that the residual capacity difference between different battery single batteries in the battery pack is larger than a set threshold value, the energy storage system issues a control instruction and generates a control signal through a CPU control unit, and corresponding control switches of K0, K1, K2, Sm-1 and Km are closed, so that all control switches of S0, S1, S2, Sm-1 and Sm are simultaneously opened, and a passive balancing method strategy in the energy storage system is realized.
When the protection system monitors that the charging state of any battery cell of the battery pack is abnormal, if the battery cell C2 is overcharged, the CPU control unit monitors that the battery capacity of the battery cell C2 reaches a set capacity threshold value, information is fed back to the energy storage control system, meanwhile, the CPU control unit issues an instruction to automatically disconnect control switches KM1 and KM2 connected with the charging and discharging PCS device, automatically disconnect all control switches S0, S1, S2, Sm-1, Sm, close control switches K1 and K2 connected with the active equalization control unit to carry out a passive equalization strategy, and when the battery capacity of the battery cell C2 reaches a normal capacity value, disconnect the control switches K1 and K2. At this time, the control switches KM1 and KM2 connected to the charging and discharging PCS device are automatically closed and the monitoring result is fed back to the energy storage control system, so that the system operates normally.
When the protection system monitors that the temperature state of any battery cell of the battery pack is abnormal, if the temperature of the battery cell C2 is abnormal, the CPU control unit monitors that the battery temperature T2 of the battery cell C2 reaches a set temperature threshold value, information is fed back to the energy storage control system, meanwhile, the CPU control unit issues an instruction to automatically disconnect the control switches KM1 and KM2 connected with the charging and discharging PCS device, and automatically disconnects all control switches S0, S1, S2, Sm-1, Sm, and automatically disconnects all control switches K0, K1, K2, Km-1, Km connected with the passive equalization control unit. The battery pack failure caused by abnormal temperature is avoided, even the whole energy storage system is influenced by the fire of the battery, the loss is reduced to the minimum, and the energy storage system can be restarted after the corresponding abnormal battery is checked and maintained by a worker. At this time, the control switches KM1 and KM2 connected to the charging and discharging PCS device are automatically closed, and simultaneously receive the corresponding active and passive equalization strategies, and the corresponding control switches are automatically closed to implement the active and passive equalization strategies.
Fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application. Referring to fig. 6, at a hardware level, the electronic device includes a processor, and optionally further includes an internal bus, a network interface, and a memory. The Memory may include a Memory, such as a Random-Access Memory (RAM), and may further include a non-volatile Memory, such as at least 1 disk Memory. Of course, the electronic device may also include hardware required for other services.
The processor, the network interface, and the memory may be connected to each other via an internal bus, which may be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one double-headed arrow is shown in FIG. 6, but that does not indicate only one bus or one type of bus.
And the memory is used for storing programs. In particular, the program may include program code comprising computer operating instructions. The memory may include both memory and non-volatile storage and provides instructions and data to the processor.
The processor reads the corresponding computer program from the nonvolatile memory into the memory and then runs the computer program to form a protection device for the energy storage management system on a logic level. The processor is used for executing the program stored in the memory and is specifically used for executing the following operations:
monitoring electric energy parameters in each single battery in the battery pack;
and issuing a preset control instruction to enable the connection switch unit to execute a corresponding protection action according to the condition of the electric energy parameter in a preset scene.
The method executed by the protection device for the energy storage management system according to the embodiment shown in fig. 1 of the present application may be applied to or implemented by a processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.
The electronic device may further execute the method executed by the protection device for the energy storage management system in fig. 1, and implement the functions of the protection device for the energy storage management system in the embodiment shown in fig. 1, which are not described herein again in this embodiment of the present application.
An embodiment of the present application further provides a computer-readable storage medium storing one or more programs, where the one or more programs include instructions, which, when executed by an electronic device including a plurality of application programs, enable the electronic device to perform the method performed by the protection apparatus for an energy storage management system in the embodiment shown in fig. 1, and are specifically configured to perform:
monitoring electric energy parameters in each single battery in the battery pack;
and issuing a preset control instruction to enable the connection switch unit to execute corresponding protection actions according to the condition that the electric energy parameters are in the preset scene.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both permanent and non-permanent, removable and non-removable media, may implement the information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (12)
1. A protection method for an energy storage management system, wherein the energy storage management system comprises a battery pack, a control unit and a PCS, the method comprises the following steps:
monitoring an electric energy parameter in each battery monomer in the battery pack;
and issuing a preset control instruction to enable the connection switch unit to execute corresponding protection actions according to the condition that the electric energy parameters are in the preset scene.
2. The method of claim 1, wherein the issuing of a preset control command to cause a connection switch unit to execute a corresponding protection action according to the condition of the electric energy parameter in a preset scene comprises:
and issuing a preset control instruction according to the condition of the electric energy parameter in a preset scene so as to adjust the circuit in the connection switch unit and/or change the on-off state in the connection switch unit.
3. The method of claim 2, wherein the on-off state in the circuit connection switch unit comprises at least one of:
the control unit is connected with the battery pack in an on-off state, wherein the control unit comprises an active balance control unit and a passive balance control unit;
and the positive and negative electrodes of the PCS and the positive and negative electrodes of the battery pack are in on-off states.
4. The method of claim 1, wherein the issuing of a preset control command to cause a connection switch unit to execute a corresponding protection action according to the condition of the electric energy parameter in a preset scene comprises:
and when the residual capacity difference value between different battery packs is larger than a first preset threshold value, issuing a first preset control instruction, closing a first switch group in the connection switch unit and opening a second switch group in the circuit connection switch unit so as to execute a protection action corresponding to active equalization.
5. The method of claim 4, wherein the issuing of the preset control command to cause the connection switch unit to execute the corresponding protection action according to the condition of the electric energy parameter in the preset scene comprises:
and when the residual capacity difference value between different single batteries in the battery pack is greater than a second preset threshold value, issuing a second preset control instruction, closing a second switch group in the connection switch unit, and disconnecting a first switch group in the circuit connection switch unit to execute a protection action corresponding to the passive equalization.
6. The method of claim 1, wherein:
the monitoring of the electrical energy parameters in each cell in the battery pack includes:
monitoring that the battery capacity of any one battery monomer in the battery pack reaches a preset capacity threshold value, and feeding back an abnormal charging state;
the issuing of the preset control instruction to enable the connection switch unit to execute the corresponding protection action according to the condition of the electric energy parameter in the preset scene comprises the following steps:
when the charging state of any one of the battery cells in the battery pack is abnormal, issuing a third preset control instruction, disconnecting a third switch group and a first switch group in the connection switch unit, and closing a preset switch in the second switch group to execute a protection action corresponding to temperature protection, wherein the third switch group comprises a control switch connected with the PCS, the preset switch in the second switch group comprises a part of switches connected with the passive equalization connector, the second switch group comprises a control switch connected with the passive equalization connector, and the first switch group comprises a control switch connected with the active equalization connector;
and when the charging state of any one of the battery monomers in the battery pack is not abnormal, disconnecting the preset switch in the second switch group and simultaneously closing the control switch in the third switch group.
7. The method of claim 6, wherein:
the monitoring of the electrical energy parameters in each cell in the battery pack includes:
monitoring that the battery temperature of any one battery monomer in the battery pack reaches a preset temperature threshold value, and feeding back an abnormal charging state;
the issuing of a preset control instruction to execute a corresponding protection action according to the condition of the electric energy parameter in a preset scene comprises the following steps:
when the temperature state of any one of the single batteries in the battery pack is abnormal, a fourth preset control instruction is issued, and a third switch group, the second switch group and the first switch group in the connection switch unit are disconnected;
and when the temperature state of any one of the battery monomers in the battery pack is not abnormal, restarting the energy storage management system, and closing the third switch group at the same time.
8. A protection device for an energy storage management system, wherein the energy storage management system comprises a battery pack, a control unit, and a PCS, the device comprising:
the monitoring module is used for monitoring the electric energy parameters of each battery monomer in the battery pack;
and the protection module is used for issuing a preset control instruction according to the condition of the electric energy parameter in a preset scene so as to enable the connection switch unit to execute a corresponding protection action.
9. A protection system for an energy storage management system, wherein the energy storage management system comprises a battery pack, an active equalization control unit, a passive equalization control unit, and a PCS, the protection system comprising:
the main control unit is used for feeding back the electric energy parameters in each battery monomer in the battery pack to the energy storage management system and receiving a preset control instruction issued by the energy storage management system after processing the electric energy parameters so as to control the connection switch unit to execute corresponding protection actions;
the connection switch unit is used for executing an active equalization strategy or a passive equalization method strategy to perform equalization processing by switching on or off the control switch, and disconnecting the control unit from the battery pack and disconnecting the PCS from the battery pack if a safety risk occurs;
a control unit connector comprising: the active equalization connector is connected with the active equalization control unit and the battery pack; the passive equalization connector is connected with the passive equalization control unit and the battery pack;
a PCS connector for connecting the PCS and the battery pack for charging the battery pack through the PCS.
10. The system of claim 9, further comprising: a temperature acquisition unit, a battery pack connector and a power supply unit,
the battery pack connector is used for connecting the battery pack.
The temperature acquisition unit is used for monitoring the temperature of the running state or the static state of each battery monomer in the battery pack in real time and feeding data back to the control unit for processing;
and the power supply unit is used for supplying power to the control unit and the connecting switch unit.
11. An electronic device, comprising:
a processor; and
a memory arranged to store computer executable instructions which, when executed, cause the processor to perform the method of any of claims 1 to 7.
12. A computer readable storage medium storing one or more programs which, when executed by an electronic device comprising a plurality of application programs, cause the electronic device to perform the method of any of claims 1-7.
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