KR102658099B1 - Battery management system for battery having plateau and operating method thereof - Google Patents

Abstract

A battery management device according to an embodiment of the present invention is a battery management device that manages and controls a battery configured to be connected in parallel with another battery, and includes at least one processor; and a memory storing at least one instruction executed through the at least one processor.
Here, the at least one command includes: a command for diagnosing whether the battery is abnormal based on status information of the battery; And when the battery is determined to be in an abnormal state, whether to release the parallel connection between the battery and another battery based on whether the state of charge (SOC) of the battery is within a critical SOC range predefined as an SOC estimation impossible section. It may include commands to control.

Description

Battery management device and control method for a battery having a voltage plateau section {BATTERY MANAGEMENT SYSTEM FOR BATTERY HAVING PLATEAU AND OPERATING METHOD THEREOF}

The present invention relates to a battery management device and a control method thereof, and more specifically, to a battery management device and a control method thereof for stable operation of a battery system including a battery having a voltage plateau section.

Secondary batteries are batteries that can be reused by charging even after discharge, and can be used as an energy source for small devices such as portable phones, tablet PCs, and vacuum cleaners, and as an energy source for medium to large devices such as automobiles and ESS (Energy Storage System) for smart grids. It is also used as a

Secondary batteries are applied to the system in the form of an assembly such as a battery module in which multiple battery cells are connected in series or parallel, or a battery pack in which battery modules are connected in series or parallel, depending on the requirements of the system.

Carbon materials are mainly used as negative electrode active materials for lithium secondary batteries, and lithium-containing cobalt oxide (LiCoO2) is mainly used as positive electrode active materials. In addition, lithium-containing manganese oxide (LiMnO2, LiMn2O4, etc.) and lithium-containing nickel oxide (LiNiO2) ) is also being considered.

Recently, lithium iron phosphate (LiFePO4)-based compounds are being used as cathode active materials for lithium secondary batteries. LFP (Lithium Iron Phosphate) batteries, which use lithium iron phosphate as a positive electrode active material, are superior to other batteries in terms of thermal stability and cost efficiency. However, LFP batteries exhibit flat characteristics with a voltage plateau in the charging characteristic curve (relationship curve between open-circuit voltage and SOC), and there is a problem in which SOC (State of Charge) cannot be accurately estimated in the plateau. there is.

During the operation of a battery system composed of battery assemblies connected in parallel, if an abnormal condition occurs in a specific battery assembly, the battery assembly is blocked (disconnected in parallel) from the battery system, and when the abnormal condition is resolved, it is re-entered into the battery system. can be connected Here, the battery assembly may be reconnected to the battery system when its SOC is the same or very similar to the SOC of other battery assemblies.

However, in the case of a battery system with an LFP battery, if an abnormal condition occurs in a specific battery assembly during the voltage flat section, the battery assembly must be fully charged or fully discharged in order to be disconnected from the battery system and then reconnected. It has to be. This is because the SOC of the LFP battery cannot be accurately estimated in the voltage flat section. Accordingly, there is a problem in that it may take a considerable amount of time until the corresponding battery assembly is reconnected to the battery system.

Korean Patent Publication No. 10-2022-0102453

The purpose of the present invention to solve the above problems is to provide a battery management device for stable operation of a battery system including a battery having a voltage plateau section.

Another object of the present invention to solve the above problems is to provide a control method for such a battery management device.

Another purpose of the present invention to solve the above problems is to provide a battery system including such a battery management device.

A battery management device according to an embodiment of the present invention for achieving the above object is a battery management device that manages and controls a battery configured to be connected in parallel with another battery, and includes at least one processor; and a memory storing at least one instruction executed through the at least one processor.

Here, the at least one command includes: a command for diagnosing whether the battery is abnormal based on status information of the battery; And when the battery is determined to be in an abnormal state, whether to release the parallel connection between the battery and another battery based on whether the state of charge (SOC) of the battery is within a critical SOC range predefined as an SOC estimation impossible section. It may include commands to control.

Here, the critical SOC range may be predefined as a SOC section in which the amount of change in voltage compared to the amount of change in SOC is less than or equal to a predefined threshold value in the corresponding curve between the SOC and voltage of the battery.

The command for controlling whether to release the parallel connection may include a command for disconnecting the parallel connection between the battery and another battery when the SOC of the battery is outside the critical SOC range.

The command for controlling whether to release the parallel connection is, when the SOC of the battery is within the threshold SOC range, depending on whether the parallel connection maintenance condition predefined based on the status information of the battery is satisfied, It may include a command that controls whether to release the parallel connection between batteries.

The command for controlling whether to release the parallel connection is to establish a parallel connection between the battery and another battery when the first condition is satisfied, which is defined as a state in which the change in the accumulated current value of the battery is less than or equal to a predefined threshold value. It may contain commands to maintain.

The command for controlling whether to release the parallel connection is a state in which the state value including at least one of the temperature value, current value, and voltage value of the battery is less than or equal to a predefined threshold value, or the amount of change in the state value is predefined. When the second condition defined as a state of being less than or equal to the specified threshold is satisfied, a command for maintaining a parallel connection between the battery and another battery may be included.

The command for controlling whether to release the parallel connection may include a command for disconnecting the parallel connection between the battery and another battery when the parallel connection maintenance condition is not satisfied.

A control method according to an embodiment of the present invention for achieving the above other object is a control method of a battery management device that manages and controls a battery configured to be connected in parallel with another battery, based on status information of the battery, Diagnosing whether the battery is abnormal; And when the battery is determined to be in an abnormal state, whether to release the parallel connection between the battery and another battery based on whether the state of charge (SOC) of the battery is within a critical SOC range predefined as an SOC estimation impossible section. It may include; controlling.

The critical SOC range may be predefined as an SOC section in which the amount of change in voltage compared to the amount of change in SOC is less than or equal to a predefined threshold value in the corresponding curve between the SOC and voltage of the battery.

The step of controlling whether to release the parallel connection may include disconnecting the parallel connection between the battery and another battery when the SOC of the battery is outside the critical SOC range.

The step of controlling whether to release the parallel connection includes, when the SOC of the battery is within the threshold SOC range, depending on whether a predefined parallel connection maintenance condition is satisfied based on the state information of the battery, It may include a step of controlling whether to release the parallel connection between batteries.

The step of controlling whether to release the parallel connection includes, when the first condition is satisfied, which is defined as a state in which the amount of change in the accumulated current value of the battery is less than or equal to a predefined threshold, the parallel connection between the battery and another battery is performed. It may include a maintenance step.

The step of controlling whether to release the parallel connection may include a state in which a state value including at least one of the temperature value, current value, and voltage value of the battery is less than or equal to a predefined threshold value, or the amount of change in the state value is predefined. When the second condition defined as a state of being less than or equal to the specified threshold is satisfied, the step of maintaining a parallel connection between the battery and another battery may be included.

The step of controlling whether to release the parallel connection may include disconnecting the parallel connection between the battery and another battery when the parallel connection maintenance condition is not satisfied.

A battery system according to an embodiment of the present invention for achieving the above still other object includes a plurality of batteries connected in parallel; and a plurality of battery management devices provided in correspondence with each of the plurality of batteries and managing and controlling the corresponding batteries. Here, the battery management device diagnoses whether the battery is abnormal based on the battery status information, and when the battery is determined to be in an abnormal state, the SOC (State of Charge) of the battery is adjusted to the SOC estimation impossible section. Based on whether it is within a defined critical SOC range, it is possible to control whether to release the parallel connection between the battery and another battery.

The critical SOC range may be predefined as an SOC section in which the amount of change in voltage compared to the amount of change in SOC is less than or equal to a predefined threshold value in the corresponding curve between the SOC and voltage of the battery.

If the SOC of the battery is outside the critical SOC range, the battery management device may disconnect the parallel connection between the battery and another battery.

When the SOC of the battery is within the critical SOC range, the battery management device releases the parallel connection between the battery and another battery depending on whether a parallel connection maintenance condition predefined based on the status information of the battery is satisfied. You can control whether or not

The battery management device may maintain a parallel connection between the battery and another battery when the first condition, which is defined as a state in which the amount of change in the accumulated current value of the battery is less than or equal to a predefined threshold, is satisfied.

The battery management device is configured to operate in a state in which a state value including at least one of a temperature value, a current value, and a voltage value of the battery is less than or equal to a predefined threshold value, or the amount of change in the state value is less than or equal to a predefined threshold value. When the second condition defined as is satisfied, parallel connection between the battery and other batteries can be maintained.

The battery management device may disconnect the parallel connection between the battery and another battery when the parallel connection maintenance condition is not satisfied.

According to the embodiment of the present invention as described above, the operational stability of the battery system can be improved by minimizing abnormal battery blocking measures in the voltage plateau section.

1 is a block diagram of a general energy storage system.
Figure 2 shows the charging characteristic curve of the LFP battery.
Figure 3 is a block diagram of a battery system according to an embodiment of the present invention.
Figure 4 is an operation flowchart of a method for controlling a battery management device according to an embodiment of the present invention.
Figure 5 is an operation flowchart of a control method of a battery management device according to another embodiment of the present invention.
Figure 6 is a block diagram of a battery management device according to an embodiment of the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention. While describing each drawing, similar reference numerals are used for similar components.

Terms such as first, second, A, B, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be named a second component without departing from the scope of the present invention, and similarly, the second component may also be named a first component. The term “and/or” includes any of a plurality of related stated items or a combination of a plurality of related stated items.

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted in an ideal or excessively formal sense unless explicitly defined in the present application. No.

Some terms used in this specification are defined as follows.

A battery cell is the smallest unit that stores power, and a battery module refers to an assembly of multiple battery cells electrically connected.

A battery rack refers to a system with a minimal single structure that can be monitored and controlled through a BMS (Battery Management System) by connecting module units set by the battery manufacturer in series/parallel. It consists of multiple battery modules and one BPU or It may be configured to include a protective device.

A battery bank may refer to a group of large-scale battery rack systems consisting of connecting multiple racks in parallel. Monitoring and control of the rack BMS (RBMS) at the battery rack level can be performed through the BMS at the battery bank level.

A battery assembly refers to an assembly that includes a plurality of electrically connected battery cells and is applied to a specific system or device to function as a power source. Here, the battery assembly may mean a battery module, battery pack, battery rack, or battery bank, but the scope of the present invention is not limited to these entities.

BSC (Battery Section Controller) is a device that performs top-level control of the battery system, including the battery system at the battery bank level, and is also used as a control device in battery systems with multiple bank level structures.

SOC (State of Charge; Charging Rate) expresses the current charged state of the battery as a percentage [%], and SOH (State of Health; Remaining Rate) expresses the current remaining state of the battery as a percentage [%].

1 is a block diagram of a general energy storage system.

The smallest unit of a battery that stores power in an energy storage system (ESS) is usually a battery cell. A series/parallel combination of battery cells forms a battery module, and multiple battery modules can form a battery rack. In other words, a battery rack can be the minimum unit of a battery system by combining battery modules in series/parallel. Here, depending on the device or system in which the battery is used, the battery rack may also be referred to as a battery pack.

Referring to FIG. 1, one battery rack 10 may include a plurality of battery modules and one BPU or protection device. Battery racks can be monitored and controlled through RBMS (Rack BMS). RBMS monitors the current, voltage, and temperature of each battery rack it oversees, calculates the SOC (Status Of Charge) of the battery based on the monitoring results, and controls charging and discharging.

Meanwhile, the BPU (Battery Protection Unit) is a device to protect the battery from abnormal current and fault current in the battery rack unit. The BPU may include a main contactor (MC), fuse, circuit breaker (CB), or disconnect switch (DS). The BPU can control the battery system on a rack basis by controlling the main contactor on/off according to the control of the RBMS. The BPU can also protect the battery from short-circuit current using a fuse in the event of a short circuit. In this way, existing battery systems can be controlled through protection devices such as BPU and switchgear.

Meanwhile, a BSC (Battery Section Controller) 20 is installed in each battery section that includes multiple batteries and peripheral circuits and devices to monitor and control control objects such as voltage, current, temperature, and circuit breakers. The BSC is the top control device of a battery system including a bank-level battery system including a plurality of battery racks, and is also used as a control device in a battery system with multiple bank-level structures.

In addition, the Power Conversion System (PCS) 40 installed in each battery section is a device that performs actual charging and discharging based on charging/discharging commands from the EMS 30, and is a power conversion unit (DC/AC inverter) ) and a controller. Meanwhile, the output of each BPU may be connected to a power generation device (e.g., a solar power generation device) and the PCS 40 through a DC bus, and the PCS 40 may be connected to the grid. In addition, EMS (Energy Management System) 30 or PMS (Power Management System) manages the ESS system as a whole.

Figure 2 shows the charging characteristic curve of the LFP battery.

More specifically, Figure 2 shows the charging characteristic curve of an LFP (Lithium Iron Phosphate) battery using lithium iron phosphate as a positive electrode active material. The charging characteristic curve represents the correspondence between open circuit voltage (OCV) and SOC measured during the charging process of the battery.

During the operation of the battery system, the battery management system (BMS) may perform battery balancing control based on the SOC of the battery or reconnect a battery that has been disconnected from the battery system to the battery system. Here, in order to calculate the SOC of the battery, a method of measuring the open-circuit voltage value of the battery and estimating the SOC of the battery based on the measured open-circuit voltage value is mainly used.

Referring to FIG. 2, the charging characteristic curve of the LFP battery has a voltage plateau (Plateau) in the SOC range of about 10% to about 90%. In the case of an LFP battery with such flat characteristics, it is difficult to accurately estimate SOC in a flat section, and accurate estimation is possible only in a non-flat section (for example, a section where SOC is 90% or more, or a section where SOC is 10% or less). In other words, a battery system using an LFP battery can accurately estimate SOC only in a very limited SOC section.

In FIG. 1, if an abnormal condition occurs in a specific battery rack among the plurality of battery racks 10 included in the battery system, the battery rack may be disconnected from the battery rack in parallel with other battery racks and may be blocked from the battery system. there is. Thereafter, if the abnormal condition is resolved by inspection of the battery rack, the battery rack may be reconnected to the battery system. Here, for stable operation of the battery system, the blocked battery rack must be reconnected to the battery system when the SOC between the blocked battery rack and other battery racks is very similar.

However, in the case of a battery rack with LFP batteries, accurate estimation of SOC is possible only in non-flat sections (for example, sections where SOC is 90% or more, or sections where SOC is 10% or less), so the battery rack must be fully charged or Full discharge must be performed. Accordingly, it takes a considerable amount of time for the disconnected battery rack to be reconnected to the battery system.

The present invention was made to solve the problems of the prior art, and is a battery management device and device that can improve the operational stability of the battery system by minimizing abnormal battery blocking measures in sections where accurate estimation of SOC is not possible. It's about control methods.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings.

Figure 3 is a block diagram of a battery system according to an embodiment of the present invention.

Referring to FIG. 3, the battery system according to an embodiment of the present invention includes a plurality of batteries 100 and a plurality of battery management devices that are provided in correspondence with each of the plurality of batteries and manage and control the corresponding batteries. It may be configured to include (200). Here, a plurality of batteries 100 may be configured to be connected in parallel with each other.

The battery 100 may refer to a battery rack, but the scope of the present invention is not limited thereto. That is, the battery 100 according to the present invention may correspond to a battery module, battery pack, or battery bank.

In an embodiment, the battery 100 may correspond to a battery assembly that includes one or more battery cells (eg, LFP battery cells) having at least a partial voltage flat section in the charging characteristic curve.

The battery management device 200 can manage and control the corresponding battery 100 by collecting state information about the corresponding battery 100 and performing predefined control operations based on the collected state information. there is. Here, the battery management device 200 can control charging and discharging of the battery and diagnose whether battery cells are broken based on battery status information.

The battery management device 200 controls a switching device provided at the input/output terminal of the battery 100 to disconnect or reconnect parallel connections with other batteries.

Each of the plurality of battery management devices 200 is connected to the upper battery management device 300 through a network, transmits battery status information to the upper battery management device 300, and receives control from the upper battery management device 300. It may be configured to receive commands and operate. Here, the upper battery management device 300 may correspond to a Battery Section Controller (BSC), an Energy Management System (EMS), or a Power Management System (PMS).

Each of the battery management devices 200 can diagnose abnormalities in each battery based on status information of the corresponding battery. For example, the battery management device 200 may detect the occurrence of a fault, such as a short circuit or ignition, based on status information including one or more of the voltage value, current value, and temperature value of the battery.

When an abnormal state occurs in a specific battery, the battery management device 200 corresponding to the abnormal battery may determine whether the SOC of the battery is within a critical SOC range that is predefined as an SOC estimation impossible section. Here, the battery management device 200 checks the voltage value of the battery at the time of detecting an abnormal state of the battery, and checks the SOC corresponding to the confirmed voltage value through a previously stored relationship table between voltage and SOC. , the current SOC of the battery can be determined.

The critical SOC range may be predefined as a SOC section in which the amount of change in voltage compared to the amount of change in SOC is less than or equal to a predefined threshold value in the correspondence curve between the SOC and voltage of the battery. For example, the critical SOC range may be defined as 5 to 95, or 10 to 90.

Thereafter, the battery management device 200 may control whether to release the parallel connection between the defective battery and other batteries based on whether the SOC of the defective battery is within the critical SOC range.

If the SOC of the abnormal battery is outside the predefined critical SOC range, the battery management device 200 may control the input/output switch of the relevant battery to be in an open state, thereby disconnecting the parallel connection with the other battery. That is, when the abnormal battery is in a state where SOC can be estimated, the battery management device 200 blocks the abnormal battery from the battery system, and when the abnormal state of the battery is resolved, the battery is transferred to the battery system based on the calculated SOC. You can control reconnection.

If the SOC of the abnormal battery is within a predefined critical SOC range, the battery management device 200 may maintain a parallel connection between the battery in question and other batteries. Here, the battery management device 200 may disconnect the parallel connection with another battery after the corresponding battery leaves the critical SOC range. That is, when a defective battery is in a state where SOC cannot be estimated, the battery management device 200 may not immediately block the defective battery from the battery system, but may block it from the battery system after it is converted to a state where SOC can be estimated. Accordingly, unnecessary time consumed until a defective battery is reconnected to the battery system can be shortened.

Figure 4 is an operation flowchart of a method for controlling a battery management device according to an embodiment of the present invention.

The control method shown in FIG. 4 can be performed in a battery management device that manages and controls a battery configured to be connected in parallel with other batteries. Here, the battery management device may correspond to a BMS that directly manages the battery, or a higher BMS (eg, BSC, EMS, or PMS) of the BMS.

The battery management device can collect battery status information and diagnose whether there is an abnormality in the battery based on the collected status information (S410). For example, the battery management device collects status information including one or more of the voltage value, current value, and temperature value of the battery, and determines whether an abnormal state such as a short circuit or ignition occurs based on the collected status information. can be judged.

When an abnormal state occurs in the battery (Y in S420), the battery management device may determine whether the SOC of the battery is within a critical SOC range predefined as an SOC inestimable section (S430). Here, the battery management device can control whether to release the parallel connection depending on whether the SOC of the battery is within the critical SOC range.

The critical SOC range may be predefined in the correspondence curve between the SOC and voltage of the battery as a SOC section in which the amount of change in voltage compared to the amount of change in SOC is less than or equal to a predefined threshold, for example, 5 to 95, or 10 or more. It can be defined as 90 or less.

If the SOC of the battery is outside the predefined critical SOC range (N in S430), the battery management device may control the input/output switch of the battery to be in an open state to disconnect the parallel connection with another battery (S440). That is, if the battery in which an abnormal state has occurred is in a state in which SOC can be estimated, the battery management device can disconnect the battery from the battery system.

If the SOC of the battery is within a predefined critical SOC range (Y in S430), the battery management device may maintain a parallel connection with another battery (S450).

Afterwards, the battery management device re-determines whether an abnormal state has occurred in the battery (S410, S420), and if the battery is outside the critical SOC range (N in S430), the parallel connection with the other battery can be released (S440) ).

Figure 5 is an operation flowchart of a control method of a battery management device according to another embodiment of the present invention. Meanwhile, the control method shown in FIG. 5 is an embodiment in which decision logic for a parallel connection maintenance condition is added to the control method shown in FIG. 4.

The battery management device can collect battery status information and diagnose whether there is an abnormality in the battery based on the collected status information (S510).

When an abnormal state occurs in the battery (Y in S520), the battery management device may determine whether the SOC of the battery is within a critical SOC range predefined as an SOC inestimable section (S530).

If the SOC of the battery is outside the predefined critical SOC range (N in S530), the battery management device may control the input/output switch of the battery to be in an open state to disconnect the parallel connection with another battery (S540).

If the SOC of the battery is within the predefined critical SOC range (Y in S530), the battery management device determines whether the predefined parallel connection maintenance condition is satisfied based on the battery status information (S550), and determines the result. Depending on this, you can control whether to release the parallel connection. Here, the battery management device, if the parallel connection maintenance condition is not satisfied (N in S550), releases the parallel connection with the other battery (S540), and if the parallel connection maintenance condition is satisfied (Y in S550), Parallel connection with other batteries can be maintained (S560).

The parallel connection maintenance condition may include a first condition defined as a state in which the amount of change in the accumulated current value of the battery is less than or equal to a predefined threshold value.

More specifically, when the abnormal battery is within the critical SOC range (SOC estimation impossible state), the battery management device may check the accumulated current amount of the battery during a preset period. If the change in the amount of leakage current of the battery exceeds a predefined threshold (dissatisfaction of the first condition), the parallel connection with the other battery is disconnected, and if it is less than the predefined threshold (satisfaction of the first condition), the other battery is disconnected. A parallel connection with the battery can be maintained.

In other words, even if the battery is in a state where SOC cannot be estimated (within the critical SOC range) at the time of abnormality determination, if the voltage changes due to the accumulated current and switches to a state where SOC can be estimated (unsatisfaction of the first condition), another battery The parallel connection with may be configured to be released.

The parallel connection maintenance condition may include a second condition defined as a stable state of the battery. In an embodiment, the second condition may be defined as a state in which the state value including at least one of the temperature value, current value, and voltage value of the battery is less than or equal to a predefined threshold value. In another embodiment, the second condition may be defined as a state in which the amount of change in the state value including at least one of the temperature value, current value, and voltage value of the battery is less than or equal to a predefined threshold value.

More specifically, when the abnormal battery is within the critical SOC range (SOC estimation impossible state), the battery management device may monitor the state value of the battery for a preset period. If the state value of the battery exceeds the predefined threshold (dissatisfaction of the second condition), the parallel connection with the other battery is disconnected, and if it is below the predefined threshold (satisfaction of the second condition), the parallel connection with the other battery is disconnected. A parallel connection can be maintained.

In other words, even if the battery is in a state where SOC cannot be estimated (within the critical SOC range) at the time of abnormality determination, if the battery is in an unstable state (for example, a critical state where the temperature value exceeds the threshold) (the second condition is not satisfied) , it can be configured to disconnect from parallel connection with other batteries.

In an embodiment, the battery management device maintains a parallel connection with another battery when both the first and second conditions included in the parallel connection maintenance condition are satisfied, and when any one of the first and second conditions is not satisfied. If not, the parallel connection with other batteries can be disconnected.

Figure 6 is a block diagram of a battery management device according to an embodiment of the present invention.

The battery management device 600 according to an embodiment of the present invention is located within a battery system and may correspond to a device that manages and controls a battery connected in parallel with other batteries. For example, the battery management device 600 may correspond to RBMS, BSC, EMS, or PMS, or may be implemented as included in any one of them.

The battery management device 600 may include at least one processor 610, a memory 620 that stores at least one command executed through the processor, and a transceiver 630 that is connected to a network and performs communication. You can.

The at least one command may include: a command for diagnosing an abnormality in the battery based on status information of the battery; And when the battery is determined to be in an abnormal state, whether to release the parallel connection between the battery and another battery based on whether the state of charge (SOC) of the battery is within a critical SOC range predefined as an SOC estimation impossible section. It may include commands to control.

Here, the critical SOC range may be predefined as a SOC section in which the amount of change in voltage compared to the amount of change in SOC is less than or equal to a predefined threshold value in the corresponding curve between the SOC and voltage of the battery.

The command for controlling whether to release the parallel connection may include a command for disconnecting the parallel connection between the battery and another battery when the SOC of the battery is outside the critical SOC range.

The command for controlling whether to release the parallel connection is, when the SOC of the battery is within the threshold SOC range, depending on whether the parallel connection maintenance condition predefined based on the status information of the battery is satisfied, It may include a command that controls whether to release the parallel connection between batteries.

The command for controlling whether to release the parallel connection is to establish a parallel connection between the battery and another battery when the first condition is satisfied, which is defined as a state in which the change in the accumulated current value of the battery is less than or equal to a predefined threshold value. It may contain commands to maintain.

The command for controlling whether to release the parallel connection is a state in which the state value including at least one of the temperature value, current value, and voltage value of the battery is less than or equal to a predefined threshold value, or the amount of change in the state value is predefined. When the second condition defined as a state of being less than or equal to the specified threshold is satisfied, a command for maintaining a parallel connection between the battery and another battery may be included.

The command for controlling whether to release the parallel connection may include a command for disconnecting the parallel connection between the battery and another battery when the parallel connection maintenance condition is not satisfied.

The battery management device 600 may further include an input interface device 640, an output interface device 650, a storage device 660, etc. Each component included in the battery management device 600 is connected by a bus 670 and can communicate with each other.

Here, the processor 610 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present invention are performed. . Memory (or storage device) may be comprised of at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory may consist of at least one of read only memory (ROM) and random access memory (RAM).

The operation of the method according to an embodiment of the present invention can be implemented as a computer-readable program or code on a computer-readable recording medium. Computer-readable recording media include all types of recording devices that store data that can be read by a computer system. Additionally, computer-readable recording media can be distributed across networked computer systems so that computer-readable programs or codes can be stored and executed in a distributed manner.

Although some aspects of the invention have been described in the context of an apparatus, it may also refer to a corresponding method description, where a block or device corresponds to a method step or feature of a method step. Similarly, aspects described in the context of a method may also be represented by corresponding blocks or items or features of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as a microprocessor, programmable computer, or electronic circuit, for example. In some embodiments, one or more of the most important method steps may be performed by such an apparatus.

Although the present invention has been described with reference to preferred embodiments of the present invention, those skilled in the art may modify and change the present invention in various ways without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that it is possible.

100: battery
200: Battery management device
300: Parent battery management device
600: Battery management device

Claims (21)

A battery management device that manages and controls a battery that is connected in parallel with other batteries,
at least one processor; and
Includes a memory that stores at least one instruction executed through the at least one processor,
The at least one command is:
A command for diagnosing whether the battery is abnormal based on the battery status information; and
When the battery is determined to be in an abnormal state, the parallel connection between the battery and other batteries is determined based on whether the SOC (State of Charge) of the battery is within the critical SOC range predefined as the SOC estimation impossible section. Contains commands to control;
The command for controlling whether to release the parallel connection is:
If the SOC of the battery is outside the critical SOC range, the parallel connection between the battery and the other battery is disconnected, and if the SOC of the battery is within the critical SOC range, a parallel connection predefined based on the status information of the battery is performed. Containing a command to control whether to release the parallel connection between the battery and another battery, depending on whether the connection maintenance condition is satisfied,
Battery management device. In claim 1,
The critical SOC range is,
In the correspondence curve between the SOC and voltage of the battery, the SOC section is predefined as the SOC section in which the amount of change in voltage relative to the amount of change in SOC is less than or equal to a predefined threshold,
Battery management device. delete delete In claim 1,
A command for controlling whether to release the parallel connection between the battery and another battery, depending on whether the parallel connection maintenance condition is satisfied, is:
When the first condition is satisfied, which is defined as a state in which the amount of change in the accumulated current value of the battery is less than or equal to a predefined threshold, comprising an instruction to maintain a parallel connection between the battery and another battery,
Battery management device. In claim 1,
A command for controlling whether to release the parallel connection between the battery and another battery, depending on whether the parallel connection maintenance condition is satisfied, is:
A second condition defined as a state in which the state value including at least one of the temperature value, current value, and voltage value of the battery is less than or equal to a predefined threshold value, or a state in which the amount of change in the state value is less than or equal to a predefined threshold value. When satisfied, including an instruction to maintain a parallel connection between the battery and another battery,
Battery management device. In claim 1,
A command for controlling whether to release the parallel connection between the battery and another battery, depending on whether the parallel connection maintenance condition is satisfied, is:
If the parallel connection maintenance condition is not satisfied, including a command to disconnect the parallel connection between the battery and another battery,
Battery management device. A control method of a battery management device that manages and controls a battery configured in parallel connection with other batteries, comprising:
Diagnosing whether the battery is abnormal based on the battery status information; and
When the battery is determined to be in an abnormal state, the parallel connection between the battery and other batteries is determined based on whether the SOC (State of Charge) of the battery is within the critical SOC range predefined as the SOC estimation impossible section. Including; controlling,
The step of controlling whether to release the parallel connection is,
If the SOC of the battery is outside the critical SOC range, the parallel connection between the battery and the other battery is disconnected, and if the SOC of the battery is within the critical SOC range, a parallel connection predefined based on the status information of the battery is performed. Comprising a step of controlling whether to release the parallel connection between the battery and another battery, depending on whether the connection maintenance condition is satisfied.
Control method of battery management device. In claim 8,
The critical SOC range is,
In the correspondence curve between the SOC and voltage of the battery, the SOC section is predefined as the SOC section in which the amount of change in voltage relative to the amount of change in SOC is less than or equal to a predefined threshold,
Control method of battery management device. delete delete In claim 8,
The step of controlling whether to release the parallel connection between the battery and another battery, depending on whether the parallel connection maintenance condition is satisfied, includes:
Comprising the step of maintaining a parallel connection between the battery and another battery when the first condition, defined as a state in which the change in the accumulated current value of the battery is less than or equal to a predefined threshold, is satisfied,
Control method of battery management device. In claim 8,
The step of controlling whether to release the parallel connection between the battery and another battery, depending on whether the parallel connection maintenance condition is satisfied, includes:
A second condition defined as a state in which the state value including at least one of the temperature value, current value, and voltage value of the battery is less than or equal to a predefined threshold value, or a state in which the amount of change in the state value is less than or equal to a predefined threshold value. When satisfying, comprising maintaining a parallel connection between the battery and another battery,
Control method of battery management device. In claim 8,
The step of controlling whether to release the parallel connection between the battery and another battery, depending on whether the parallel connection maintenance condition is satisfied, includes:
If the parallel connection maintenance condition is not satisfied, including the step of disconnecting the parallel connection between the battery and another battery,
Control method of battery management device. A plurality of batteries connected in parallel; and
A plurality of battery management devices are provided in correspondence with each of the plurality of batteries and manage and control the corresponding batteries,
The battery management device,
Based on the battery status information, diagnose any abnormalities in the battery,
If the battery is determined to be in an abnormal state, control whether to release the parallel connection between the battery and other batteries based on whether the SOC (State of Charge) of the battery is within the critical SOC range predefined as the SOC estimation impossible section. do,
If the SOC of the battery is outside the critical SOC range, the parallel connection between the battery and the other battery is disconnected, and if the SOC of the battery is within the critical SOC range, a parallel connection predefined based on the status information of the battery is performed. Controlling whether to release the parallel connection between the battery and another battery, depending on whether the connection maintenance condition is satisfied.
Battery system. In claim 15,
The critical SOC range is,
In the correspondence curve between the SOC and voltage of the battery, the SOC section is predefined as the SOC section in which the amount of change in voltage relative to the amount of change in SOC is less than or equal to a predefined threshold,
Battery system. delete delete In claim 15,
The battery management device,
Maintaining a parallel connection between the battery and another battery when the first condition, which is defined as a state in which the change in the accumulated current value of the battery is less than or equal to a predefined threshold, is satisfied,
Battery system. In claim 15,
The battery management device,
A second condition defined as a state in which the state value including at least one of the temperature value, current value, and voltage value of the battery is less than or equal to a predefined threshold value, or a state in which the amount of change in the state value is less than or equal to a predefined threshold value. When satisfying, maintaining a parallel connection between the battery and other batteries,
Battery system. In claim 15,
The battery management device,
If the conditions for maintaining the parallel connection are not satisfied, disconnecting the parallel connection between the battery and another battery,
Battery system.