CN112531853B - Main battery system management unit and protection method of battery single cabinet group parallel charging and discharging system - Google Patents
Main battery system management unit and protection method of battery single cabinet group parallel charging and discharging system Download PDFInfo
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- CN112531853B CN112531853B CN202011468524.5A CN202011468524A CN112531853B CN 112531853 B CN112531853 B CN 112531853B CN 202011468524 A CN202011468524 A CN 202011468524A CN 112531853 B CN112531853 B CN 112531853B
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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
- H02J7/00304—Overcurrent protection
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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
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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
- H02J7/00308—Overvoltage 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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- 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)
Abstract
The invention provides a main battery system management unit and a protection method of a parallel charging and discharging system of a battery single cabinet group, and relates to the field of energy storage. The main battery system management unit is positioned in a main control cabinet, the main control cabinet is connected to a battery single cabinet group through a main switch module, and the battery single cabinet group comprises more than two battery single cabinets connected in parallel; the master battery system management unit is configured to: receiving a feedback message sent by a first battery single cabinet in the battery single cabinet group, wherein the feedback message comprises a normal signal and an abnormal signal; under the condition of continuously receiving an abnormal signal of the first battery single cabinet within preset time, determining the first battery single cabinet as an abnormal battery single cabinet; the abnormal signal comprises a limit alarm signal or a fault signal; in order to acquire the number of the abnormal battery single cabinets, the main switch module is controlled to be in a disconnected state under the condition that the number of the abnormal battery single cabinets exceeds the number threshold of the safe operation single cabinets. The technical scheme of the invention can ensure the safety of the parallel charging and discharging system of the single battery cabinet group.
Description
The application is a divisional application provided by the invention with the application number of 201810039462.2, the application date of 2018, 16.01 and the name of 'parallel charging and discharging system and protection method of a single battery cabinet group', and the application is Ningde time New energy science and technology Co.
Technical Field
The invention relates to the field of energy storage, in particular to a main battery system management unit and a protection method of a parallel charging and discharging system of a battery single cabinet group.
Background
In order to satisfy a large amount of power consumption in various fields, a charge and discharge system may be provided. And under the condition of abundant electric energy, charging the charging and discharging system. Under the condition of electric energy shortage, a charging and discharging system is utilized to supply power to the outside.
The charging and discharging system can comprise an energy storage converter, a master control cabinet and a plurality of battery single cabinets, and the battery single cabinets comprise energy storage elements such as batteries. When dangerous conditions such as overvoltage, overcurrent or overhigh temperature occur in the single battery cabinet, the single battery cabinet can control the energy storage element to be disconnected with the outside, namely the single battery cabinet is disconnected with the outside so as to ensure the safety of the single battery cabinet. However, when the battery single cabinet is disconnected from the outside due to a dangerous condition, the energy storage converter does not receive the notification message, and the original power charging or discharging is still ensured. Therefore, the charging power or the discharging power borne by the disconnected battery cell is distributed to other battery cells which are not disconnected from the outside, so that the workload of other battery cells is increased, and the other battery cells may be damaged due to the overlarge workload.
Disclosure of Invention
The embodiment of the invention provides a parallel charging and discharging system of a single battery cabinet group and a protection method, which can ensure the safety of the parallel charging and discharging system of the single battery cabinet group.
On one hand, the embodiment of the invention provides a parallel charging and discharging system of a battery single cabinet group, which comprises a master control cabinet, a master switch module and the battery single cabinet group, wherein the master control cabinet is connected to the battery single cabinet group through the master switch module, and the battery single cabinet group comprises more than two battery single cabinets connected in parallel; the master control cabinet is configured to receive feedback messages sent by the battery single cabinet groups, and control the working state of the master switch module according to the feedback messages so as to control the on-off of charging and discharging paths between all the battery single cabinets arranged in parallel in the battery single cabinet groups and the outside, wherein the working state comprises an open state and a closed state.
On the other hand, the embodiment of the invention provides a protection method of a parallel charging and discharging system of a single battery cabinet group, which is applied to the parallel charging and discharging system of the single battery cabinet group in the technical scheme, and the protection method of the parallel charging and discharging system of the single battery cabinet group comprises the following steps: the master control cabinet receives a feedback message sent by the battery single cabinet group; and the master control cabinet controls the working state of the master switch module according to the feedback message so as to control the on-off of all the battery single cabinets arranged in parallel in the battery single cabinet group and an external charge and discharge passage, wherein the working state comprises an open state and a closed state.
The embodiment of the invention provides a parallel charging and discharging system of a single battery cabinet group and a protection method. The master control cabinet can judge the running state of each battery single cabinet in the battery single cabinet group according to the feedback message sent by the battery single cabinet group. Therefore, the main switch module is controlled to be in an open state or a closed state, and the purpose of controlling the on-off of the charging and discharging passages between all the battery single cabinets in the battery single cabinet group and the outside is achieved. When the main switch module is in a disconnected state, the charging and discharging paths between all the battery single cabinets and the outside are disconnected, so that the charging power or the discharging power of the battery single cabinets which are disconnected individually is prevented from being distributed to other battery single cabinets, the battery single cabinets are prevented from being damaged due to the fact that the working load is too heavy, and the safety of the parallel charging and discharging system of the battery single cabinet group is guaranteed.
Drawings
The present invention will be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters designate like or similar features.
Fig. 1 is a schematic structural diagram of a parallel charging and discharging system of a battery single cabinet set according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a parallel charging/discharging system of a single battery pack according to another embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for protecting a parallel charging/discharging system of a battery single-cabinet group according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a method for protecting a parallel charging/discharging system of a single battery pack according to another embodiment of the present invention;
fig. 5 is a flowchart illustrating a method for protecting a parallel charging/discharging system of a single battery pack according to another embodiment of the present invention;
fig. 6 is a flowchart of a protection method for a parallel charging and discharging system of a single battery cabinet group according to still another embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration and algorithm set forth below, but rather covers any modification, replacement or improvement of elements, components or algorithms without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.
The embodiment of the invention provides a parallel charging and discharging system of a single battery cabinet group and a protection method applied to the parallel charging and discharging system of the single battery cabinet group, which can ensure the safe operation of the parallel charging and discharging system of the single battery cabinet group and avoid the damage of the single battery cabinet in the single battery cabinet group due to the overweight working load.
Fig. 1 is a schematic structural diagram of a parallel charging and discharging system of a battery unit cabinet 12 in an embodiment of the present invention. As shown in fig. 1, the parallel charging and discharging system for the battery single cabinet 12 set includes a main control cabinet 10, a main switch module 11 and a battery single cabinet 12 set. The electric path is connected for charging and discharging, and the communication path is connected for transmitting communication signals.
Wherein, the main control cabinet 10 is connected to the battery single cabinet 12 group through the main switch module 11. The battery single cabinet 12 group comprises more than two battery single cabinets 12 connected in parallel. The battery single cabinet 12 may include energy storage elements such as a single battery cell, a battery module composed of a plurality of single battery cells, or a battery pack composed of a plurality of battery modules, which is not limited herein. The on-off of the main switch module 11 can control the on-off of the charging and discharging paths between all the battery electric cabinets in the battery single cabinet 12 group and the outside.
The master control cabinet 10 is configured to receive a feedback message sent by the battery single cabinet 12 group, and control the working state of the master switch module 11 according to the feedback message, so as to control the on/off of the charging and discharging paths between all the battery single cabinets 12 arranged in parallel in the battery single cabinet 12 group and the outside.
Each battery single cabinet 12 in the battery single cabinet 12 group can send a feedback message to the general control cabinet 10. The battery single cabinets 12 send feedback information to the main control cabinet 10, so that the main control cabinet 10 can obtain the operation state of each battery single cabinet 12 in the battery single cabinets 12. In one example, the feedback information may include a normal signal indicating that the battery unit 12 is operating normally and an abnormal signal indicating that an abnormal condition occurs in the battery unit 12. For example, the battery unit 12 has an over-voltage, over-temperature or over-current phenomenon, that is, an abnormal condition occurs in the battery unit 12.
The operating state of the main switch module 11 includes an open state and a closed state. If the master switch module 11 is in an off state, the charging and discharging paths between all the battery cells 12 connected in parallel in the battery cell 12 group and the outside are disconnected, and charging and discharging cannot be performed. If the main switch module 11 is in a closed state, the charging and discharging paths between all the battery single cabinets 12 arranged in parallel in the battery single cabinet 12 group and the outside are communicated, so that charging and discharging can be performed. In one example, to facilitate the control operation, the main switch module 11 has an electrical operation function, and the on/off of the main switch module 11 can be realized through signal control.
In one example, the main Control cabinet 10 can be externally connected to a Power Control converter (PCS) System. The parallel charging and discharging system of the battery single cabinet 12 group can receive electric energy transmitted from the outside or transmit the electric energy to the outside through the energy storage converter.
In the embodiment of the present invention, the main control cabinet 10 can control the on/off of the charging/discharging path between the battery single cabinets 12 and the outside by controlling the switch module to be in the open state or the closed state. When the main switch module 11 is in the off state, the charging and discharging paths between all the battery cells 12 and the outside are all disconnected, so that the charging power or the discharging power of the individually disconnected battery cells 12 is prevented from being distributed to other battery cells 12, the battery cells 12 are prevented from being damaged due to the overweight of the working load, and the safety of the parallel charging and discharging system of the battery cell 12 group is ensured.
Moreover, when the main switch module 11 is in the off state, the charge and discharge paths between the battery cells 12 and the outside can be synchronously disconnected, so that the damage of the switch module in the battery cell 12 which is finally disconnected, which may be caused by the asynchronous disconnection of the charge and discharge paths between the battery cells 12 and the outside, is avoided, and the safety of each component in the battery cell 12 is ensured.
Fig. 2 is a schematic structural diagram of a parallel charging and discharging system for 12 battery units in a single battery cabinet according to another embodiment of the present invention. Fig. 2 differs from fig. 1 in that the main control cabinet 10 in fig. 1 includes a main Battery system Management Unit 101(MBMU, Master Battery Management Unit) in fig. 2. The Battery Unit cabinet 12 in fig. 1 includes a sub-switch module 122 and a sub-Battery system Management Unit 121 (SBMU) in fig. 2.
The main battery system management unit 101 is configured to control the main switch module 11 to be in an off state according to the abnormal signal, so as to control all the battery cells 12 to be disconnected from the external charging and discharging path. The feedback message includes an exception signal. In one example, the anomaly signal may include a limit alarm signal or a fault signal. The limit alarm signal is a signal generated when some index or some indexes of the battery unit cabinet 12 reach a safety limit threshold value. The fault signal is a signal generated when the single battery cabinet 12 is in fault. For example, if the battery cell 12 has an over-voltage, over-temperature or over-current phenomenon, a limit alarm signal or a fault signal may be generated.
If the feedback message received by the master control cabinet 10 includes an abnormal signal, the master battery system management unit 101 may control the master switch module 11 to be in an off state, so that the charging and discharging paths between all the battery cells 12 and the outside are disconnected. The situation that the workload of other battery single cabinets 12 is increased due to the fact that only the battery single cabinet 12 generating the abnormal signal is disconnected is avoided, and the safety of all the battery single cabinets 12 in the parallel charging and discharging system of the battery single cabinet 12 group is guaranteed.
In one example, the sub battery system management unit 121 is configured to control the sub switch module 122 to be in an off state when the battery unit cabinet 12 generates an abnormal signal, so that the charge and discharge path of the battery unit cabinet 12 is disconnected from the outside.
When the sub-switch module 122 in the battery single cabinet 12 is turned off, the charge and discharge path between the battery single cabinet 12 and the outside is cut off, and the battery single cabinet 12 is no longer charged or discharged. When the battery single cabinet 12 has a detectable safety abnormity problem, an abnormity signal is generated. When the battery single cabinet 12 generates an abnormal signal, the sub-battery system management unit 121 in the battery single cabinet 12 controls the sub-switch module 122 in the battery single cabinet 12 to be in an off state, so that the battery single cabinet 12 is not charged or discharged any more, and the problem of safety abnormality is further avoided.
In one example, the sub-switch module 122 may include a relay, and when the battery unit cabinet 12 generates an abnormal signal, the battery unit cabinet 12 turns off its relay, thereby ensuring that the charge/discharge path between the battery unit cabinet 12 and the outside is disconnected. In another example, the sub-switch module 122 may further include other switch devices capable of controlling the on/off of the path, which is not limited herein.
The master control cabinet 10 is further configured to control each battery unit cabinet 12 to enable the sub-switch module 122 of each battery unit cabinet 12 to be in an off state when the master switch module 11 is controlled to be in the off state, so as to control each battery unit cabinet 12 to be disconnected from the external charging and discharging circuit.
In one example, the master switch module 11 includes a circuit breaker. Since the charging and discharging currents of all the battery cells 12 are collected at the main switch module 11, the current at the main switch module 11 is large. The breaker can bear large current, can safely protect the 12 groups of parallel charging and discharging systems of the single battery cabinet, and avoids the main switch module 11 from being burnt. For ease of operation, a circuit breaker with an electrically operated function is optional. In another example, the main switch module 11 may further include other switch devices capable of controlling the on/off of the path, which is not limited herein.
In order to further ensure the safety of the battery single cabinet 12 without generating safety abnormity in the parallel charging and discharging system of the battery single cabinet 12 group. When the master control cabinet 10 controls the master switch module 11 to be in the off state, a control instruction may also be sent to each battery unit cabinet 12, where the control instruction controls each battery unit cabinet 12 to control the slave switch module 122 to be in the off state. Therefore, the condition that the workload of the battery single cabinet 12 which is not disconnected with the external charging and discharging loop is increased due to the fact that the main switch module 11 does not respond to the command for controlling the main switch to be in the off state is prevented. Thereby avoiding the damage to the battery single cabinet 12 when the workload is seriously increased.
In another embodiment of the present invention, the general control cabinet 10 includes a main battery system management unit 101, and the single battery cabinet 12 includes a branch switch module 122 and a sub battery system management unit 121.
The master battery system management unit 101 in the master control cabinet 10 is configured to control the master switch module 11 to be in an off state if an abnormal signal is continuously received within a preset time, so as to control all the battery cells 12 to be disconnected from the external charging and discharging path.
The single battery cabinet 12 may jump from a normal signal to an abnormal signal due to external or internal influence. However, in this case, the battery cells 12 are normally operated, and if the charging and discharging paths between all the battery cells 12 and the outside are cut off, the efficiency of charging and discharging the battery cells 12 in parallel with the charging and discharging system is reduced.
The battery single cabinet 12 generates and sends an abnormal signal all the time in the process of abnormal conditions. The main battery system management unit 101 in the main control cabinet 10 may detect whether the abnormal signal is continuously received within a preset time, and if the abnormal signal is continuously received within the preset time, it may be determined that the abnormal condition of the battery unit cabinet 12 occurs, and the main switch module 11 needs to be turned off, so that the main switch module 11 is in an off state.
If the abnormal signal is not continuously received within the preset time, it may be determined that the abnormal condition of the battery unit 12 does not occur, and only the signal generated by the battery unit 12 jumps, so that the closed state of the main switch module 11 may be maintained, and the communication of the charge and discharge path between the battery unit 12 and the outside may be maintained.
In one example, the preset time may be set according to a working scene and a working requirement of the parallel connection charging and discharging system of the battery single cabinet 12 group. The preset time may be in the order of seconds, for example, the preset time is 2 seconds.
In the embodiment of the present invention, it is further determined whether the battery cell 12 is in an abnormal condition, and the abnormal condition of the battery cell 12 is determined, and the charging and discharging paths between all the battery cells 12 and the outside are cut off by controlling the main switch module 11 to be in the off state. Therefore, misjudgment of the abnormal condition of the battery single cabinet 12 is avoided, and the protection of the parallel charging and discharging system of the battery single cabinet 12 group can be more accurately realized.
In yet another embodiment of the present invention, the main control cabinet 10 includes a main battery system management unit 101.
The master battery system management unit 101 is configured to acquire the number of battery cells 12 that generate an abnormality signal based on the abnormality signal; if the number of the battery single cabinets 12 generating the abnormal signals exceeds the threshold value of the number of the safe operation single cabinets, the total switch module 11 is controlled to be in a disconnected state so as to control the charging and discharging paths of all the battery single cabinets 12 to be disconnected with the outside; and if the number of the battery single cabinets 12 generating the abnormal signals does not exceed the threshold value of the number of the safe operation single cabinets, controlling the total switch module 11 to be in a closed state.
In one example, each battery unit 12 can send a feedback message to the master control cabinet 10, and the master battery system management unit 101 in the master control cabinet can know which battery unit 12 the feedback message belongs to according to the feedback message. Therefore, the main battery system management unit 101 can know the battery cell 12 that has transmitted the abnormal signal according to the abnormal signal, and can count the number of the battery cells 12 that have generated the abnormal signal.
When the number of the battery single cabinets 12 generating the abnormal signals does not exceed the number of the safe operation single cabinets, the other battery single cabinets 12 not generating the abnormal signals share the input power or the output power of the battery single cabinets 12 generating the abnormal signals to normally operate, the overload state is not reached, the total switch module 11 can be controlled to be in the closed state, only the charging and discharging paths between the battery single cabinets 12 generating the abnormal signals and the outside are cut off, and the battery single cabinets 12 not generating the abnormal signals can be charged and discharged continuously. If the number of the battery single cabinets 12 generating the abnormal signal exceeds the safe operation single cabinet data, the other battery single cabinets 12 not generating the abnormal signal share the input power or the output power of the battery single cabinet 12 generating the abnormal signal, and an overload state is reached, the main switch module 11 needs to be controlled to be in a disconnection state, and all the battery single cabinets 12 stop charging and discharging.
For example, the battery single cabinet 12 group comprises 20 battery single cabinets 12 connected in parallel, and the number of the safe operation single cabinets is 2. If 1 battery single cabinet 12 in the battery electric cabinet group has an abnormal condition, the charging and discharging path between the 1 battery single cabinet 12 and the outside can be cut off. Specifically, the sub-switch modules 122 in 1 battery unit cabinet 12 can be controlled to be in an off state. If 3 battery single cabinets 12 in the battery electric cabinet group have abnormal conditions, the main switch module 11 is controlled to be in an off state, and accordingly, the charging and discharging paths between the 20 battery single cabinets 12 and the outside are all disconnected.
In the embodiment of the invention, the single battery cabinet 12 in the parallel charging and discharging system of the single battery cabinet 12 group can be ensured to work under normal load for charging and discharging to achieve the balance of charging and discharging efficiency and safety.
Fig. 3 is a flowchart of a protection method for a parallel charging and discharging system of a battery single cabinet set according to an embodiment of the present invention. The protection method of the parallel charging and discharging system of the single battery cabinet group can be applied to the parallel charging and discharging system of the single battery cabinet group in the embodiment. As shown in fig. 3, the method for protecting the parallel connection charge-discharge system of the battery single-cabinet group includes step 201 and step 202.
In step 201, the master control cabinet receives a feedback message sent by the battery single cabinet group;
in step 202, the master control cabinet controls the working state of the master switch module according to the feedback message, so as to control the on/off of the charging and discharging paths between all the battery single cabinets connected in parallel with the battery single cabinet set and the outside.
Wherein the working state comprises an open state and a closed state.
In the embodiment of the invention, the master control cabinet can control the on-off of the charging and discharging channel between the single battery cabinet and the outside by controlling the middle switch module to be in an off state or a closed state. When the main switch module is in a disconnected state, the charging and discharging paths between all the battery single cabinets and the outside are disconnected, so that the charging power or the discharging power of the battery single cabinets which are disconnected individually is prevented from being distributed to other battery single cabinets, the battery single cabinets are prevented from being damaged due to the fact that the working load is too heavy, and the safety of the parallel charging and discharging system of the battery single cabinet group is guaranteed.
Fig. 4 is a flowchart of a protection method for a parallel charging/discharging system of a battery unit in another embodiment of the present invention. Fig. 4 differs from fig. 3 in that step 202 in fig. 3 can be subdivided into step 2021 in fig. 4. The method for protecting the parallel charging and discharging system of the single battery cabinet group in fig. 4 may further include step 203 and step 204.
In step 2021, the master control cabinet controls the master switch module to be in a disconnected state according to the abnormal signal, so as to control the charging and discharging paths between all the battery single cabinets and the outside world to be disconnected.
Wherein the feedback message comprises an exception signal.
In step 203, when the battery unit cabinet generates an abnormal signal, the battery unit cabinet controls the sub-switch modules in the battery unit cabinet to be in an off state, so that the charging and discharging path between the battery unit cabinet and the outside is disconnected.
In step 204, when the master switch module is controlled to be in the off state, the master control cabinet controls each battery unit cabinet to enable the sub-switch module of each battery unit cabinet to be in the off state, so as to control each battery unit cabinet to be disconnected from the external charging and discharging circuit.
When the single battery cabinet generates an abnormal signal, the sub-battery system management unit in the single battery cabinet can control the sub-switch module in the single battery cabinet to be in a disconnected state, so that the single battery cabinet is not charged or discharged any more, and the further serious safety abnormal problem is avoided. The master control cabinet controls the disconnection of the charging and discharging path between the battery single cabinet which does not generate abnormal signals and the outside, thereby preventing the condition that the workload of the battery single cabinet which is not disconnected with the outside and has a charging and discharging loop between the master control cabinet and the outside is increased because the master switch module does not respond to the instruction for controlling the master switch to be in a disconnected state. And then avoid the work burden aggravate the damage to the battery single cabinet when serious.
Fig. 5 is a flowchart illustrating a protection method for a parallel charging/discharging system of a battery unit according to another embodiment of the present invention. Fig. 5 differs from fig. 3 in that step 202 in fig. 3 can be refined into steps 2022 to 2024 in fig. 5.
In step 2022, the main control cabinet detects whether the abnormal signal is continuously received within a preset time.
Wherein the feedback message comprises an exception signal.
In step 2023, if the abnormal signal in the feedback message is continuously received within the preset time, the main control cabinet controls the main switch module to be in the off state, so as to control the charging and discharging paths between all the battery single cabinets and the outside world to be disconnected.
In step 2024, if the abnormal signal in the feedback message is not continuously received within the preset time, the main control cabinet controls the main switch module to be in a closed state, so as to control the communication between the charging and discharging paths of all the battery single cabinets and the outside.
In the embodiment of the invention, whether the battery single cabinets are in abnormal conditions is further judged, the abnormal conditions of the battery single cabinets are determined, and the charging and discharging paths between all the battery single cabinets and the outside are cut off by controlling the main switch module to be in an off state. Therefore, misjudgment of the abnormal condition of the battery single cabinet is avoided, and the protection of the parallel charging and discharging system of the battery single cabinet group can be realized more accurately.
Fig. 6 is a flowchart illustrating a method for protecting a parallel charging/discharging system of a battery unit in accordance with another embodiment of the present invention. Fig. 6 differs from fig. 3 in that step 202 in fig. 3 can be refined into steps 2025 to 2027 in fig. 6.
In step 2025, the general control cabinet obtains the number of the battery single cabinets generating the abnormal signal based on the abnormal signal.
Wherein the feedback message comprises an exception signal.
In step 2026, if the number of the battery single cabinets generating the abnormal signal exceeds the threshold of the number of the safe operation single cabinets, the main control cabinet controls the main switch module to be in a disconnected state, so as to control the charging and discharging paths between all the battery single cabinets and the outside world to be disconnected.
In step 2027, if the number of the battery single cabinets generating the abnormal signal does not exceed the threshold of the number of the safe operation single cabinets, the main control cabinet controls the main switch module to be in a closed state.
In the embodiment of the invention, the single battery cabinet in the single battery cabinet group parallel charging and discharging system can be ensured to work under normal load as much as possible to carry out charging and discharging so as to achieve the balance of charging and discharging efficiency and safety.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For method embodiments, reference may be made to the description of the system embodiments for relevant points. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications and additions or change the order between the steps after appreciating the spirit of the invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
Claims (6)
1. A main battery system management unit is positioned in a main control cabinet, the main control cabinet is connected with a battery single cabinet group through a main switch module, the battery single cabinet group comprises more than two battery single cabinets connected in parallel, and the main battery system management unit is characterized in that,
the main battery system management unit is configured to receive a feedback message sent by a first battery single cabinet in a battery single cabinet group, wherein the first battery single cabinet is any one battery single cabinet in the battery single cabinet group, and the feedback message comprises a normal signal and an abnormal signal;
the main battery system management unit is further configured to determine that the first battery cell is an abnormal battery cell in the case that an abnormal signal of the first battery cell is continuously received within a preset time; the abnormal signal comprises a limit alarm signal or a fault signal;
the main battery system management unit is further configured to acquire the number of the abnormal battery single cabinets and control the main switch module to be in an off state when the number of the abnormal battery single cabinets exceeds a safe operation single cabinet number threshold.
2. The master battery system management unit according to claim 1, wherein the master battery system management unit is further configured to control the master switch module to be in a closed state if the number of abnormal battery cells does not exceed the safe operation cell number threshold.
3. The main battery system management unit according to claim 1, wherein the main battery system management unit is further configured to send a control instruction to the first battery cell, and the control instruction is used for instructing the first battery cell to control a branch switch module in the first battery cell to be in an off state.
4. A protection method of a battery single cabinet group parallel charging and discharging system is characterized by comprising the following steps:
receiving a feedback message sent by a first battery single cabinet in a battery single cabinet group, wherein the battery single cabinet group comprises more than two battery single cabinets connected in parallel, the first battery single cabinet is any one battery single cabinet in the battery single cabinet group, and the feedback message comprises a normal signal and an abnormal signal;
under the condition of continuously receiving an abnormal signal of the first battery single cabinet within preset time, determining that the first battery single cabinet is an abnormal battery single cabinet; the abnormal signal comprises a limit alarm signal or a fault signal;
acquiring the number of the abnormal battery single cabinets;
and under the condition that the number of the abnormal battery single cabinets exceeds the number threshold of the safe operation single cabinets, controlling a main switch module to be in a disconnected state, wherein the main switch module is connected with a main control cabinet and the battery single cabinet group.
5. The protection method according to claim 4, further comprising:
and under the condition that the number of the abnormal battery single cabinets does not exceed the threshold value of the number of the safe operation single cabinets, controlling the main switch module to be in a closed state.
6. The protection method according to claim 4, further comprising:
and sending a control instruction to the first battery single cabinet, wherein the control instruction is used for indicating the first battery single cabinet to control a branch switch module in the first battery single cabinet to be in a disconnected state.
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| CN201810039462.2A CN108155695B (en) | 2018-01-16 | 2018-01-16 | Parallel charging and discharging system and protection method for single battery cabinet group |
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| CN111786450B (en) * | 2019-04-04 | 2021-10-08 | 宁德时代新能源科技股份有限公司 | Control method of energy storage system |
| CN113640598B (en) * | 2021-07-20 | 2024-03-15 | 许继集团有限公司 | Circulation testing system and method for super-capacitor energy storage device |
| CN113759291B (en) * | 2021-09-30 | 2023-01-31 | 远景能源有限公司 | Fault detection method and device, energy storage system and readable storage medium |
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| CN102707178A (en) * | 2012-06-15 | 2012-10-03 | 中国电力科学研究院 | Method for prewarning and monitoring failures of secondary equipment of power system |
| CN106953396A (en) * | 2017-05-02 | 2017-07-14 | 安徽康力节能电器科技有限公司 | A kind of large-capacity battery pack charging system |
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| CN202513656U (en) * | 2012-03-31 | 2012-10-31 | 河北实华科技有限公司 | Modularized UPS system connected in parallel |
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| CN102707178A (en) * | 2012-06-15 | 2012-10-03 | 中国电力科学研究院 | Method for prewarning and monitoring failures of secondary equipment of power system |
| CN107076160A (en) * | 2014-08-21 | 2017-08-18 | 江森自控科技公司 | Battery monitoring system |
| CN106953396A (en) * | 2017-05-02 | 2017-07-14 | 安徽康力节能电器科技有限公司 | A kind of large-capacity battery pack charging system |
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