KR20210114758A - Battery management system and controlling method of the same - Google Patents

Abstract

The present invention relates to a battery management system and a control method thereof for enabling a stable operation of an energy storage apparatus. The battery management system comprises: a calculating unit calculating a charge state of a battery module; a monitoring unit monitoring the amount of electricity consumption of an end user; a charge and discharge limit calculating unit calculating a charge and discharge limit value based on the charge state; a margin rate calculating unit calculating a margin rate for the charge and discharge limit value based on the charge and discharge limit value and monitored data; and an alarm generating unit providing an alarm to the end user when the margin rate is lower than or equal to a reference value.

Description

BATTERY MANAGEMENT SYSTEM AND CONTROLLING METHOD OF THE SAME

The present invention relates to a battery management system and a method for controlling the same.

Recently, with the spread of electronic devices such as smartphones, uninterruptible power supply (UPS) and electric vehicles, and the spread of infrastructure of energy storage systems (ESS, Energy Storage System), research on secondary batteries as a power supply source is being actively conducted.

In the case of an energy storage device, it is necessary to store a large amount of electrical energy, and a high output is required. To this end, the energy storage device is used in the form of a battery rack including a plurality of battery modules connected in series and/or in parallel and a charging/discharging device for charging and discharging the plurality of battery modules.

In the secondary battery, a charge/discharge limit value that is an upper limit of chargeable/dischargeable power is determined according to a state of charge thereof. In general electronic devices, the range of power consumption is small, but power consumption may vary greatly depending on the number of loads used in factories, buildings, homes, etc. where energy storage devices are installed. Accordingly, when the load consumes power exceeding the set charge/discharge limit value or the energy storage device is charged beyond the charge/discharge limit value, the secondary battery may deteriorate or be damaged. Therefore, it is required to appropriately adjust the charge/discharge amount of the secondary battery.

Embodiments of the present invention have been made in view of the above problems, and provide a battery management system and a control method thereof that prevent the charge/discharge amount of the energy storage device from exceeding the charge/discharge limit value to enable stable operation of the energy storage device intended to provide

In order to solve the above technical problem, according to one aspect of the embodiments of the present invention, the state of charge calculation unit for calculating the state of charge of the battery module; a monitoring unit for monitoring the end user's power consumption; a charge/discharge limit calculation unit for calculating a charge/discharge limit value based on the state of charge; a margin rate calculation unit for calculating a margin rate for the charging/discharging limit value based on the charging/discharging limit value and the monitored data; and an alarm generator that provides an alarm to the end user when the margin rate is less than or equal to the reference value.

According to another feature of this embodiment, the state of charge calculator may calculate the state of charge by additionally considering a temperature value from the temperature detecting means for detecting the temperature of the battery module.

According to another feature of this embodiment, the monitoring unit may directly measure the power consumption of the end user.

According to another feature of this embodiment, the monitoring unit may receive data on power usage from an end user's power usage device.

According to another feature of this embodiment, a communication unit for transmitting the alarm generated by the alarm generating unit to the user device of the end user may be further included.

According to another feature of this embodiment, the communicator may further include a communication unit configured to transmit an alarm to an alarm device configured to recognize the alarm generated by the alarm generation unit to the end user.

According to another feature of this embodiment, the alarm may be configured such that the margin rate is displayed to the end user.

According to another feature of this embodiment, the alarm generating unit may vary the level of the alarm according to the size of the margin calculated by the margin rate calculating unit.

According to another feature of this embodiment, the battery management system may be mounted in the home ESS.

In order to solve the above technical problem, according to another aspect of the embodiments of the present invention, calculating the state of charge of the battery module; monitoring the end user's power usage; calculating a charge/discharge limit value based on the state of charge; calculating a margin for the charge/discharge limit value based on the charge/discharge limit value and the monitored data; and providing an alarm to the end user when the margin rate is less than or equal to the reference value.

According to another feature of this embodiment, the alarm may be configured such that the margin rate is displayed to the end user.

According to another feature of this embodiment, the monitoring may include receiving data on the power usage from the power usage device of the end user.

According to the battery management system and the control method thereof as described above, it is possible to prevent the charge/discharge amount of the energy storage device from exceeding the charge/discharge limit value, thereby enabling the stable operation of the energy storage device.

1 is a diagram schematically illustrating an example to which a battery system according to an embodiment of the present invention is applied.
2 is a diagram showing the configuration of a battery system according to an embodiment of the present invention.
3 is a block diagram illustrating a function of a battery management system according to an embodiment of the present invention.
4 is a flowchart illustrating a control method of a battery management system according to an embodiment of the present invention.
5 is a graph for explaining the effect of using the battery management system according to an embodiment of the present invention.
6 is a flowchart illustrating a control method of a battery management system according to another embodiment of the present invention.
7 is a diagram schematically illustrating another example to which a battery system according to an embodiment of the present invention is applied.
8 is a block diagram illustrating a function of an alarm device according to an embodiment of the present invention.
9 is a hardware configuration diagram of a battery management system according to an embodiment of the present invention.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this document, the same reference numerals are used for the same components in the drawings, and duplicate descriptions of the same components are omitted.

For various embodiments of the present invention disclosed in this document, specific structural or functional descriptions are only exemplified for the purpose of describing the embodiments of the present invention, and various embodiments of the present invention may be implemented in various forms. and should not be construed as being limited to the embodiments described in this document.

Expressions such as "first", "second", "first", or "second" used in various embodiments may modify various components regardless of order and/or importance, do not limit For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be renamed to the first component.

Terms used in this document are only used to describe specific embodiments, and may not be intended to limit the scope of other embodiments. The singular expression may include the plural expression unless the context clearly dictates otherwise.

1 is a diagram schematically illustrating an example to which a battery system according to an embodiment of the present invention is applied.

Referring to FIG. 1 , a battery system 1 is connected between a load 3 and a system 2 and used. The battery system 1 may be an energy storage device. The battery system 1 may include a battery module including a rechargeable battery. The battery system 1 may supply stored power to the load 3 or to the system 2 . Also, the battery system 1 may be charged by receiving power from the system 2 . The battery system 1 may include a battery module for storing electrical energy and a battery management system for controlling the operation of the battery module. A detailed configuration of the battery system 1 will be described later.

In the battery system 1 according to the present embodiment, when charging or discharging is performed close to the charging/discharging limit value during charging and discharging, a function of notifying the end user of this fact is provided. The battery system 1 provides an alarm to the end user when the margin rate (difference) between the charge/discharge limit value and the actual charge/discharge power of the battery module is less than or equal to a reference value.

The battery system 1 may calculate the state of charge of the battery module in order to calculate the charge/discharge limit value. In addition, the battery system 1 may monitor the power consumption of the load 3 in order to calculate the amount of discharge during discharging. In addition to the method of measuring the power discharged by the battery system 1 directly to the load 3 , the monitoring of the power usage is data on the power usage from the individual loads 3a , 3b , ... 3n in the load 3 . It can also be implemented as a method of receiving .

When the margin ratio is less than or equal to the reference value, when the charging amount during charging of the battery module increases or the power consumption of the load increases during discharging, there is a risk that the charge/discharge amount may exceed the charge/discharge limit value. If the charge/discharge amount exceeds the charge/discharge limit value, the secondary battery in the battery module may deteriorate or be damaged. Therefore, by providing an alarm to the end user in the battery system 1 in advance, it is possible to prevent the charge/discharge amount from exceeding the charge/discharge limit value.

The grid 2 is a power grid that supplies power to loads that consume power, such as factories, buildings, and homes. The grid 2 supplies power to the load 3 so that the load 3 can operate. In addition, the system 2 may supply power to the battery system 1 to charge the battery system 1 , and vice versa, may receive power from the battery system 1 .

The load 3 is a configuration that consumes power, such as factories, buildings, and homes, as described above. The load 3 may include one device that consumes power, but may include a plurality of loads 3a, 3b, ... 3n. For example, when the load 3 is a household, the individual loads 3a, 3b, ... 3n may include various home appliances such as a lighting device, a refrigerator, an air conditioner, and a washing machine. In addition, when the load 3 is a factory, the individual loads 3a, 3b, ... 3n may include a lighting device, a driving device such as a motor, and a device such as a heater or an air conditioner. These individual loads are exemplary and will not be limited to the above example if the device consumes power.

Additionally, in the system to which the battery system 1 according to the present embodiment is applied, the user device 4 may be further included. The user device 4 may be a target to be notified of a notification from the battery system 1 . For example, the user device 4 may be a smartphone or the like. The user device 4 may provide various types of alarms to the end user according to the alarm provided from the battery system 1 .

2 is a diagram showing the configuration of the battery system 1 according to an embodiment of the present invention.

The battery system 1 stores power and supplies power to the load 3 when an abnormality occurs in the system 2 . The battery system 1 may be an energy storage device. For example, the battery system 1 may be a battery rack of an energy storage device. Also, the battery system 1 may be a household energy storage device. The battery system 1 may include a battery module 10, a battery management system (BMS) 20, a switching unit 30, a battery protection unit (BPU) 40, and the like. have.

The battery module 10 is a configuration that is mounted on a battery rack to store power. Although one battery module 10 is illustrated in FIG. 2 , a plurality of battery modules 10 may be provided according to specifications required for the battery system 1 . A plurality of battery modules 10 may be connected in series and/or parallel within the battery system 1 to provide a required output.

The battery module 10 may include a plurality of battery cells as a configuration for storing power. The battery module 10 may include a plurality of battery cells connected in series and/or in parallel. The number and connection type of battery cells may be determined according to a required output of the battery module 10 . The battery cells included in the battery module 10 include lithium ion (Li-ion) batteries, lithium ion polymer (Li-ion polymer) batteries, nickel cadmium (Ni-Cd) batteries, nickel hydrogen (Ni-MH) batteries, and the like. It may be a secondary battery, but is not limited thereto as long as it is a rechargeable battery.

The BMS 20 controls and manages the overall operation of the battery system 1 . The BMS 20 may detect the temperature of the battery module 10 (or the battery battery system 1 ), the voltage and current output from the battery module 10 , and the like. The battery module 10 may calculate parameters such as SOC in the state of charge or SOH indicating the degree of degradation from values such as temperature, voltage, and current detected by direct measurement or receiving from the outside. The BMS 20 may provide measuring means such as a sensor at an appropriate location in the battery system 1 for detecting voltage, current, temperature, and the like.

The BMS 20 may transmit values such as temperature, voltage, and current or calculated values such as SOC and SOH to an external device. The external device may be an upper-level controller when there is an upper-level device that manages the battery system 1 .

In addition, the BMS 20 according to the present embodiment calculates a charge/discharge limit value according to the calculated state of charge. The charge/discharge limit value means the amount of charge and/or discharge allowed in the current state of charge of the battery module 10 . The BMS 20 may calculate a margin rate based on the calculated charge/discharge limit value and the actual charge or discharge amount. To this end, the BMS 20 may include means capable of detecting the amount of charge or the amount of actual discharge. In addition, when the calculated margin rate is less than or equal to the reference value, the BMS 20 may generate an alarm and provide it to the end user.

The BMS 20 executes a computer program to control and manage the overall operation of the battery module 10 and a microcomputer as a controller that controls the overall operation of the BMS 20, and a computer program necessary for the operation of the BMS 20. It may include various components such as a memory for storing, an input/output device such as a sensor or measuring means, a communication device for communicating with an external device, and other peripheral circuits.

The switching unit 30 may be a device for supplying power to or from the system 2 to the system 2 or the load 3 during charging or discharging of the battery module 10 . The switching unit 30 may be a relay or a contactor. The operation of the switching unit 30 may be controlled by the BMS 20 .

BPU 40 may include components for stable operation of the battery module 10 . The BPU 40 may include cooling means such as a cooling fan for controlling the temperature in the battery system 1 . The BPU 40 may include a circuit breaker or the like for blocking the current path when an overcurrent occurs.

Although not shown, a power conversion device may be provided in the battery system 1 , between the battery system 1 and the load 3 , or between the battery system 1 and the system 2 . DC power output from the battery system 1 may be converted into AC power through the power conversion device. In addition, AC power supplied from the system 2 through the power conversion device may be converted into DC power and supplied to the battery system 1 .

Hereinafter, the functions of the BMS 20 will be described in detail.

3 is a block diagram illustrating a function of the battery management system 20 according to an embodiment of the present invention.

Referring to FIG. 3 , the BMS 20 includes a charging state calculation unit 100 , a monitoring unit 110 , a charge/discharge limit value calculation unit 120 , a margin rate calculation unit 130 , an alarm generation unit 140 , and a communication unit ( 150) and the like.

The state of charge calculation unit 100 calculates the state of charge of the battery module 10 . The state of charge calculator 100 may detect a voltage, a temperature, and the like for calculating the state of charge. The state of charge calculation unit 100 may include a voltage detection unit 101 to detect a voltage. In addition, the state of charge calculation unit 100 may include a temperature detection unit 102 to detect a temperature. The voltage detection unit 101 and/or the temperature detection unit 102 included in the state of charge calculation unit 100 may directly measure a voltage or a temperature. Or alternatively, the voltage detection unit 101 and/or the temperature detection unit 102 may detect the voltage and temperature in a manner of receiving data regarding the voltage or temperature from the outside through the communication unit 150 . The state of charge calculator 100 calculates the state of charge of the battery module 10 based on the detected voltage and temperature.

However, the state of charge calculation unit 100 is not limited to calculating the state of charge in the above-described manner. For example, the state of charge may be calculated using only the voltage of the battery module 10 . Alternatively, the BMS 20 may include a current detection means for detecting the charge/discharge current, and calculate the state of charge by integrating the detected charge/discharge current. In this case, the calculated state of charge may be corrected by additionally considering the temperature value detected by the temperature detection means such as the temperature detection unit 102 .

The monitoring unit 110 monitors the power consumption of the end user. The monitoring unit 110 may include a load power detection unit 111 to monitor power usage by loads on the end user side. In this embodiment, the monitoring unit 110 may monitor the power usage by directly measuring the power usage of the end user. To this end, the load power detecting unit 111 may additionally provide a power detecting means for the individual loads 3a, 3b, ... 3n of the load 3 side. Alternatively, the load power detection unit 111 may provide a power detection means for measuring the total amount of power used by the load 3 between the node and the load 3 to which the battery system 1 and the grid 2 are connected. it might be

The monitoring unit 110 may further include a grid power detection unit 112 , and may detect power supplied from the grid 2 to the load 3 . In this case, the monitoring unit 110 may determine that the remainder obtained by subtracting the amount of power supplied from the system 2 from the power consumption of the end user is the amount of power output or to be output by the battery module 10 . Conversely, the monitoring unit 110 may determine that the remainder obtained by subtracting the power consumption of the end user from the amount of power supplied from the system 2 is the amount of power supplied to the battery module 10 for charging.

The charge/discharge limit value calculator 120 calculates a charge/discharge limit value based on the state of charge of the battery module 10 calculated by the state of charge calculator 100 . The charge/discharge limit value calculation unit 120 may calculate the charge/discharge limit value based on a pre-created lookup table or a preset function. In the parameters considered in the lookup table or function, not only the state of charge but also the temperature may be additionally considered. In addition, a lookup table or a function for calculating the charge/discharge limit value may be previously stored in a storage medium such as a memory.

The margin rate calculator 130 calculates a margin rate based on the charge/discharge limit value calculated by the charge/discharge limit value calculator 120 and the data monitored by the monitoring unit 110 . The margin rate may be a value obtained by subtracting the end user's power usage from the charge/discharge limit value. Alternatively, the margin rate may be a value obtained by subtracting the charge/discharge limit value by subtracting the power supplied from the system 2 from the end user's power usage. That is, the margin rate may be a difference between the charge/discharge limit value and the amount of power to be supplied by the battery module 10 . Alternatively, the margin rate may be a difference between the charge/discharge limit value and the amount of power to be supplied to the battery module 10 for charging.

The alarm generating unit 140 generates an alarm to provide to the end user when the calculated margin ratio is less than or equal to a reference value. For example, the alarm generator 140 may generate an alarm including the content that the margin ratio is less than or equal to a reference value. Alternatively, the alarm generator 140 may generate an alarm including data indicating how much the margin ratio is in addition to the content that the margin ratio is less than or equal to the reference value. Based on this, the margin rate itself may be displayed in the user device 4 . The generated alarm may include data for display for display, or may include content indicating an alarm method. As the alarm method, various methods such as a warning by sound, a warning by a light emitting device, and a warning by a display on a display may be used.

The alarm generating unit 140 may vary the generated alarm according to the size of the margin ratio. That is, the alarm generating unit 140 may vary the degree of informing the end user according to the size of the margin rate. For example, when the margin ratio is less than or equal to a reference value or a relatively large value, a notification that the margin ratio has dropped below the reference value may be generated, or an alarm for causing the light emitting device to emit light may be generated. Conversely, when the margin ratio is less than the reference value and the end user's power consumption is close to the charging/discharging limit value, an alarm may be generated or an alarm causing the user device 4 to vibrate.

The communication unit 150 transmits the alarm generated by the alarm generation unit 140 to the user device 4 of the end user. When the user device 4 receives an alarm by the communication unit 150 , the user device 4 performs an operation corresponding to the received alarm so that the end user knows that the margin rate is less than or equal to the reference value. That is, the BMS 20 provides an alarm to the end user via the user device 4 .

4 is a flowchart illustrating a control method of a battery management system according to an embodiment of the present invention.

Referring to FIG. 4 , during operation of the battery system 1 , the state of charge calculation unit 100 of the BMS 20 calculates the state of charge of the battery module 10 ( S1 ). Data necessary for calculating the state of charge, for example, at least one of voltage and current may be detected. A temperature may also be additionally detected.

In addition, the monitoring unit 110 of the BMS 20 monitors the power consumption by directly measuring the load power (S2). That is, the monitoring unit 110 directly measures and acquires the power consumption by the load 3 of the end user. In addition, the monitoring unit 110 detects the power supplied from the system (2) (S3).

The charge/discharge limit value calculation unit 120 of the BMS 20 calculates a charge/discharge limit value based on the calculated state of charge (S4). In this case, the charge/discharge limit value calculator 120 may additionally consider the temperature of the battery module 10 .

And based on the charge/discharge limit value calculated by the margin rate calculator 130 of the BMS 20 and the monitored data, a margin rate for the charge/discharge limit value is calculated (S5). That is, the margin ratio calculator 130 may calculate the difference between the charge/discharge limit value and the amount of power to be supplied by the battery module 10 as the margin ratio. Alternatively, the margin rate calculator 130 may calculate the difference between the charge/discharge limit value and the amount of power to be supplied to the battery module 10 for charging as the margin rate.

Thereafter, it is determined whether the calculated margin ratio is less than or equal to the reference value (S6), and when the margin ratio is less than or equal to the reference value, the alarm generating unit 140 generates an alarm (S7), and the end user's alarm generating means through the communication unit 150 to transmit an alarm (S8).

The BMS 20 determines whether the operation of the battery system 1 is terminated (S9), and returns to step S1 while the battery system 1 is operating (No in S9) and repeats the above-described operation.

5 is a graph for explaining the effect of using the battery management system according to an embodiment of the present invention.

5A illustrates a method of operating a battery management system in a conventional battery system. The graph (x) represents the charge/discharge limit value, and the graph (y) represents the end user's power usage (or the amount of power that the battery module needs to discharge).

The charge/discharge limit value may be changed as shown in graph (x) according to the state of charge. When the state of charge is large, the limited amount of charge/discharge may be relatively large, and when the state of charge is small, the limited amount of charge and discharge may be small.

At this time, when the load usage on the end user side is as shown in the graph (y), the battery module must discharge power greater than the charge/discharge limit value set in the battery module at a specific time. In this case, it may lead to deterioration or damage of the battery cell.

FIG. 5B illustrates a method of operating the battery management system 20 in the battery system 1 according to an embodiment of the present invention. The graph (x) similarly shows the charge/discharge limit value, and the graph (z) shows a case in which the end user's power consumption is induced to be reduced by the alarm according to the present invention.

As shown in (b) of FIG. 5 , when the margin rate is d1, it is determined that it is greater than the reference value and no alarm is provided. On the other hand, when the margin ratio is d2, it is determined that the margin ratio is equal to or less than the reference value, and an alarm is provided to the user device 4 . The user of the user device 4 provided with the alarm recognizes that the power usage of the load 3 exceeds the range that the battery system 1 can handle, and stops using some of the individual loads. consumption can be reduced. As a result, it is possible to prevent the battery module from having to discharge power greater than the charge/discharge limit value set in the battery module, thereby preventing deterioration or damage of the battery cell.

Although the discharging operation of the battery system 1 has been described in FIG. 5 , it will be appreciated that the same method may be applied to the charging operation of the battery system 1 .

6 is a flowchart illustrating a control method of the battery management system 20 according to another embodiment of the present invention.

This embodiment may be implemented using the BMS 20 having the same configuration as that described in FIG. 3 . However, some operations are different in the following points.

The monitoring unit 110 may receive data on the power usage from each of the individual loads 3a, 3b, ... 3n of the end user, instead of directly measuring the power usage of the end user. That is, the monitoring unit 110 may individually receive power from each of the end user's power-using devices. Alternatively, the monitoring unit 110 may collectively receive data from devices that collect data of power-using devices of the end user. The monitoring unit 110 may receive data on the power usage of these individual power-using devices through the communication unit 150 .

Referring to FIG. 6 , during operation of the battery system 1 , the state of charge calculation unit 100 of the BMS 20 calculates the state of charge of the battery module 10 ( S11 ). Data necessary for calculating the state of charge, for example, at least one of voltage and current may be detected. A temperature may also be additionally detected.

In addition, the monitoring unit 110 of the BMS 20 receives power consumption from the loads (S12). The monitoring unit 110 may individually receive data on power usage from each of the power usage devices of the load, or may receive it collectively from any one device.

Thereafter, since the operations of calculating the charge/discharge limit value, calculating the margin rate, and generating an alarm performed in steps S13 to S19 are the same as in steps S3 to S9 of FIG. 4 , a detailed description thereof will be omitted.

However, in the present embodiment, the BMS 200 can individually determine the power consumption of the loads 3a, 3b, ... 3n of the load 3. Therefore, the alarm generating unit 140 depends on the size of the margin ratio. Therefore, it may be possible to specify a load that can be stopped or reduce usage and suggest it to the end user.

In addition, the user device 4 to which the alarm generating unit 140 transmits the alarm may be adjusted to stop the use of a specific load or reduce the amount of use directly in a program for delivering the received alarm to the user. That is, by allowing the user device 4 to operate in conjunction with the individual loads 3a , 3b , ... 3n in the load 3 , it will be possible to more easily manage the power usage. In addition, if the user device 4 is implemented to operate in conjunction with the individual loads 3a, 3b, ... 3n as described above, the above-described monitoring unit 110 monitors the power consumption of the power-using device. Batch reception through the user device 4 may also be considered.

7 is a view schematically showing another example to which the battery system 1 according to an embodiment of the present invention is applied. Referring to FIG. 7 , this embodiment differs from the embodiment of FIG. 1 in that a dedicated alarm device 5 is provided instead of the user device 4 of FIG. 1 .

That is, the BMS 20 of the battery system 1 transmits the generated alarm to the alarm device 5 . The alarm device 5 is a device configured to recognize the alarm generated by the BMS 20 to the end user. The alarm device 5 may be a dedicated device manufactured to operate in response to all types of alarms that can be generated by the BMS 20 .

8 is a block diagram showing the function of the alarm device 5 according to an embodiment of the present invention.

Referring to FIG. 8 , the alarm device 5 may include at least a control unit 50 , a communication unit 51 , and an alarm generating unit 52 .

The controller 50 controls the overall operation of the alarm device 5 . The control unit 50 detects an alarm generation method from the alarm received through the communication unit 51 . In addition, the control unit 50 generates data related to the alarm generated from the received alarm. Data related to the alarm may include sound (size, duration, etc.), light emission method (illuminance, light emission time, blink method, etc.), display method (display content, etc.), vibration (vibration time, etc.).

The communication unit 51 receives the alarm generated from the BMS 20 and provides it to the control unit 50 .

The alarm generating unit 52 generates an alarm based on the data related to the alarm provided by the control unit 50 . The alarm generator 52 may include at least one of a speaker, a light emitting device, a display device, and a vibration device. The alarm generator 52 may provide an appropriate alarm by controlling the above-described devices based on the control of the controller 50 .

As described above, by providing the dedicated alarm device 5 instead of the user device 4 , the alarm generated by the alarm generating unit 140 can be optimally provided to the end user. As a result, it is possible to effectively prevent the power consumption from becoming larger than the charge/discharge limit value by effectively inducing a reduction in the power usage on the end user side.

9 is a hardware configuration diagram of the battery management system 20 according to an embodiment of the present invention.

Referring to FIG. 9 , the BMS 20 may include a controller (MCU) 200 , a memory 210 , an input/output interface 220 , and a communication interface 230 .

The MCU 200 processes various operations and calculations in the BMS 20 and controls each configuration.

In the memory 210 , an operating system program and a program for performing a function of the MCU 200 are recorded. The memory 210 may include a volatile memory and a non-volatile memory. For example, the memory 210 may be at least one of various storage media such as a semiconductor memory such as a RAM, a ROM, and a flash memory, a magnetic disk, and an optical disk. The memory 210 may be a memory built into the MCU 200 or an additional memory installed separately from the MCU 200 .

The input/output interface 220 performs input/output of various input signals and output signals.

The communication interface 230 is configured to communicate with the outside by wire and/or wirelessly.

By executing the program stored in the memory 210 by the MCU 200, the charge state calculation unit 100, the monitoring unit 110, the charge/discharge limit value calculation unit 120, the margin rate calculation unit 130 of the BMS 20, A module that performs a function as the alarm generator 140 may be implemented. The memory 210 may function as a storage means. Also, the MCU 200 may operate together with the communication interface 230 to perform a function as the communication unit 150 .

Terms such as "include", "compose", or "have" described above mean that the corresponding component may be inherent unless otherwise stated, so excluding other components is not recommended. It should be construed as being able to further include other components. All terms, including technical or scientific terms, may be interpreted as having the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Terms commonly used, such as those defined in the dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and are not interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1 battery system 2 system
3 load 4 user device
5 Alarm device 100 Charging state calculator
110 Monitoring unit 120 Charge/discharge limit value calculation unit
130 Margin rate calculator 140 Alarm generator
150 Department of Communications

Claims (12)

a state of charge calculation unit for calculating a state of charge of the battery module;
a monitoring unit for monitoring the end user's power consumption;
a charge/discharge limit calculation unit for calculating a charge/discharge limit value based on the state of charge;
a margin rate calculator configured to calculate a margin rate for the charge/discharge limit value based on the charge/discharge limit value and the monitored data; and
and an alarm generating unit configured to provide an alarm to the end user when the margin rate is less than or equal to a reference value. The method according to claim 1,
The battery management system, characterized in that the state of charge calculation unit calculates the state of charge by further considering a temperature value from a temperature detection means for detecting the temperature of the battery module. The method according to claim 1,
The battery management system, characterized in that the monitoring unit directly measures the power consumption of the end user. The method according to claim 1,
The battery management system, characterized in that the monitoring unit receives data on the power usage from the power usage device of the end user. The method according to claim 1,
The battery management system further comprising a communication unit for transmitting the alarm generated by the alarm generating unit to the user device of the end user. The method according to claim 1,
The battery management system according to claim 1, further comprising: a communication unit configured to transmit the alarm to an alarm device configured to recognize the alarm generated by the alarm generation unit to the end user. 7. The method according to claim 5 or 6,
The alarm is configured such that the margin rate is displayed to the end user. The method according to claim 1,
The alarm generating unit is configured to vary the degree of the alarm according to the magnitude of the margin calculated by the margin rate calculating unit. The method according to claim 1,
The battery management system is a battery management system, characterized in that mounted on the home ESS. calculating the state of charge of the battery module;
monitoring the end user's power usage;
calculating a charge/discharge limit value based on the state of charge;
calculating a margin for the charge/discharge limit value based on the charge/discharge limit value and the monitored data; and
and providing an alarm to the end user when the margin rate is less than or equal to a reference value. 11. The method of claim 10,
The alarm is a control method of a battery management system, characterized in that the margin is configured to be displayed to the end user. 11. The method of claim 10,
The monitoring may include receiving data on the power usage from the power usage device of the end user.

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