KR20170048991A - Method for operating heater of energy storage device - Google Patents

Abstract

The present invention relates to a method for operating a heater in energy storage devices. According to an embodiment of the present invention, the method for operating the heater in the energy storage devices comprises the following steps; measuring a first internal temperature in a housing where the energy storage device is accommodated; setting a first standard temperature to start operating the heater depending on the measured first internal temperature; measuring a temperature of batteries; and start operating the heater if the measured temperature of the battery is below the first standard temperature.

Description

[0001] METHOD FOR OPERATING HEATER OF ENERGY STORAGE DEVICE [0002]

The present invention relates to an energy storage device, and more particularly, to a heater driving method of an energy storage device capable of selectively driving a heater according to a temperature of a battery.

Energy Storage System is a system that stores generated power in each link system including power plant, substation and transmission line, and then uses energy selectively and efficiently at necessary time to enhance energy efficiency.

The energy storage system can reduce the power generation cost when the overall load ratio is improved by leveling the electric load with large time and seasonal variation, and it is possible to reduce the investment cost and the operation cost required for the electric power facility expansion, can do.

These energy storage systems are installed in power generation, transmission, distribution, and customer in power system. Frequency regulation, generator output stabilization using peak energy, peak shaving, load leveling, , And emergency power supply.

Energy storage systems are divided into physical energy storage and chemical energy storage depending on the storage method. Physical energy storage includes pumped storage, compressed air storage, and flywheel. Chemical storage includes lithium ion batteries, lead acid batteries, and Nas batteries.

Such an energy storage system discharges the charged electric power to supply electric power when necessary. This allows the energy storage system to supply power flexibly.

Specifically, an energy storage system including a power generation system operates as follows. The energy storage system discharges stored electrical energy when the load or system is overloaded. In addition, when the load or system is light, the energy storage system receives power from the generator or system to charge.

Also, when the energy storage system is independent of the power generation system, the energy storage system charges and receives the idle power from the external power supply. Also, when the system or load is overloaded, the energy storage system discharges the charged power to provide power.

The embodiments of the present invention provide a method of driving a heater of an energy storage device capable of supplying power for driving a repeater and a camera using electric power generated by a power generation device and charging the battery using power remaining at the same time.

In addition, the embodiment of the present invention provides a method of driving a heater of an energy storage device capable of driving a heater in consideration of not only a battery temperature but also a relationship between a heater internal power consumption and a battery internal power consumption.

It is to be understood that the technical objectives to be achieved by the embodiments are not limited to the technical matters mentioned above and that other technical subjects not mentioned are apparent to those skilled in the art to which the embodiments proposed from the following description belong, It can be understood.

A method of driving a heater of an energy storage device according to an embodiment of the present invention includes the steps of: measuring a first internal temperature inside a housing in which the energy storage device is accommodated; Setting a first reference temperature for starting driving of the heater according to the measured first internal temperature; Measuring battery temperature; And driving the heater when the measured battery temperature is lower than the first reference temperature.

Further, the method may further include confirming a driving condition of a converter constituting the energy storage device, wherein the first reference temperature is determined by a heating temperature generated in a switching element of the converter according to a driving condition of the converter .

Further, the method may further include checking a state of charge of the battery, wherein the first reference temperature is determined based on power consumption of the heater when the battery is charged.

Setting a second reference temperature for terminating driving of the heater; And stopping the driving of the heater when the temperature of the battery reaches the set second reference temperature or more.

The method may further include the step of measuring a second internal temperature inside the housing which changes according to the driving of the heater, wherein the second reference temperature changes according to the measured second internal temperature.

The second reference temperature decreases as the second internal temperature increases.

Further, the method may further include confirming a driving condition of a converter constituting the energy storage device, wherein the second reference temperature is a temperature of the converter, which is generated in the switching element of the converter according to the second internal temperature and the driving condition of the converter It is determined by the heat generation temperature.

The method may further include checking a state of charge of the battery, wherein the second reference temperature is determined based on power consumption of the heater when the battery is charged.

According to the embodiment of the present invention, by supplying power to the load composed of the repeater and the camera using the power generated by the power generator, stable power can be supplied to the load in an area where the power can not be provided independently.

In addition, according to the embodiment of the present invention, the final output of the energy storage device is DC power instead of AC power, it is possible to eliminate an inverter that is necessarily included in a load such as a repeater, And the product volume can be made slim.

According to the embodiment of the present invention, when the operation of the battery management system is stopped due to the full discharge of the battery, the driving power of the battery management system is preferentially supplied using the power generated through the power generation device, An additional operation for restarting the operation of the battery management system is unnecessary and the system abnormal phenomenon caused by the operation stop of the battery management system can be prevented in advance.

According to the embodiment of the present invention, the driving condition of the heater is determined based on the internal temperature of the housing, the battery temperature, and the power consumption of the battery due to the heat generated in the heating element according to the temperature of the battery, The maximum cooling effect can be obtained.

FIG. 1 is a diagram showing a schematic configuration of an energy storage system according to an embodiment of the present invention.
2 is a detailed configuration diagram of the energy storage device 200 according to the first embodiment of the present invention.
3 is a view showing a detailed configuration of a load according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating a configuration of a first repeater and a second repeater shown in FIG.
5 is a graph showing output power of each converter of the energy storage device 200 according to an embodiment of the present invention.
FIGS. 6 to 11 are views showing the flow of power supply according to each operation mode of the energy storage device 200 according to the embodiment of the present invention.
12 shows an operation mode according to a charged state of a battery according to an embodiment of the present invention.
13 is a diagram showing a power supply flow to a load according to an embodiment of the present invention.
FIG. 14 is a detailed configuration diagram of the energy storage device 200 according to the second embodiment of the present invention.
FIGS. 15 to 17 are flowcharts for explaining an operation method of the energy storage system according to an embodiment of the present invention, step by step.
18 to 20 are flowcharts for explaining the steps of the method of driving the heater of the energy storage device 200 according to the embodiment of the present invention.

Hereinafter, embodiments related to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

Combinations of the steps of each block and flowchart in the accompanying drawings may be performed by computer program instructions. These computer program instructions may be embedded in a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus so that the instructions, which may be executed by a processor of a computer or other programmable data processing apparatus, Thereby creating means for performing the functions described in the step. These computer program instructions may also be stored in a computer usable or computer readable memory capable of directing a computer or other programmable data processing apparatus to implement the functionality in a particular manner so that the computer usable or computer readable memory It is also possible to produce manufacturing items that contain instruction means that perform the functions described in each block or flowchart illustration in each step of the drawings. Computer program instructions may also be stored on a computer or other programmable data processing equipment so that a series of operating steps may be performed on a computer or other programmable data processing equipment to create a computer- It is also possible for the instructions to perform the processing equipment to provide steps for executing the functions described in each block and flowchart of the drawings.

Also, each block or each step may represent a module, segment, or portion of code that includes one or more executable instructions for executing the specified logical function (s). It should also be noted that in some alternative embodiments, the functions mentioned in the blocks or steps may occur out of order. For example, two blocks or steps shown in succession may in fact be performed substantially concurrently, or the blocks or steps may sometimes be performed in reverse order according to the corresponding function.

FIG. 1 is a diagram showing a schematic configuration of an energy storage system according to an embodiment of the present invention.

Referring to FIG. 1, an energy storage system includes a power generation apparatus 100, an energy storage device 200, and a load 300.

The power generation apparatus 100 produces electrical energy. The power generation apparatus 100 may be a solar power generation apparatus, or alternatively, it may be a wind power generation apparatus.

When the power generation apparatus 100 is a solar power generation apparatus, the power generation apparatus 100 may be a solar cell array.

A solar cell array is a combination of a plurality of solar cell modules. The solar cell module is a device for generating a predetermined voltage and current by converting solar energy into electric energy by connecting a plurality of solar cells in series or in parallel. Thus, a solar cell array absorbs solar energy and converts it into electric energy.

In addition, when the power generation apparatus 100 is a wind power generation apparatus, the power generation apparatus 100 may be a fan that converts wind energy into electric energy.

Meanwhile, the power generation apparatus 100 is not limited to the solar power generation apparatus and the wind power generation apparatus, and may be a tidal power generation apparatus. However, this is an illustrative example. The power generation apparatus 100 is not limited to the above-mentioned type, and may include all power generation systems that generate electric energy using renewable energy such as solar heat or geothermal energy.

The energy storage device 200 supplies the charging power for charging the battery 240 or the driving power for driving the load 300 using the electric energy converted through the power generation device 100.

To this end, the energy storage device 200 includes a power conversion unit constituting a power condition system (PCS) and an energy storage unit constituting an energy storage system (ESS).

The power conversion unit includes a plurality of DC-to-DC converters connected to the power generation apparatus 100 and configured to receive the DC power output from the power generation apparatus 100 and supply the charging power and the driving power using the received DC power, DC converter.

The energy storage unit may be connected to any one of the plurality of DC-DC converters to perform a charging operation in accordance with the power output through the DC-DC converter, or to supply power to another DC- And a battery management system (BMS) 250 for managing the state of the battery 240.

The load (300) receives electric energy from the energy storage device (200) and consumes electric power. In an embodiment, the load 300 is formed integrally with the energy storage device 200, thereby consuming power by receiving electrical energy supplied through the energy storage device 200.

Preferably, the load 300 includes a repeater for relaying signals between a mobile communication terminal (not shown) and a mobile communication server (not shown), and a controller 300 installed at a location where the repeater is installed, .

The energy storage system according to the present invention can be installed in the same place as a mountainous area classified as a shaded area. The power generation apparatus 100 is installed in a structure such as a platform, and the energy storage apparatus 200 is preferably installed on the floor in consideration of weight and the like.

Hereinafter, the energy storage system constructed as above will be described in more detail.

2 is a detailed configuration diagram of the energy storage device 200 according to the first embodiment of the present invention.

2, the energy storage device 200 includes a first converter 210, a second converter 220, a third converter 230, a battery 240, a BMS 250, and a system controller 260 . The energy storage device 200 further includes a heater 280 for maintaining the temperature of the battery 240 within a standard range according to the temperature of the battery 240.

The first converter 210, the second converter 220, the third converter 230, the battery 240, the BMS 250 and the system control unit 260 of the energy storage device 200 are connected to the housing Not shown).

The heater 280 is mounted on the housing. Preferably, the heater 280 is disposed at the bottom of the housing, and the battery 240 is disposed on the heater 280. The first converter 210, the second converter 210, The converter 220, the third converter 230, the BMS 250, and the system controller 260 may be sequentially housed in the housing.

One end of the first converter 210 is connected to the power generator 100 and the other end is connected to the second converter 220, the third converter 230 and the battery 240. Also, the first converter 210 may be further connected to the BMS 250 according to the embodiment.

The first converter 210 converts the voltage of the DC power output through the power generation device 100. That is, the first converter 210 is a DC-DC converter, and converts the DC power of the first level outputted through the power generator 100 into the DC power of the second level.

That is, to apply the power supplied from the power generation apparatus 100 to the battery 240, the second converter 220, and the third converter 230, a step-down is required. Accordingly, the first converter 210 can input the voltage of the power generated by the power generation apparatus 100 to the second converter 220, the third converter 230, and the battery 240 To the magnitude of the voltage.

For example, the voltage of the DC power generated through the power generation apparatus 100 may be 120V, and thus the first converter 210 reduces the DC voltage to 52V and outputs the DC voltage.

The first converter 210 may further include a rectifier circuit (not shown) that converts the AC power into DC power when the power output from the power generation apparatus 100 is AC power.

In addition, the first converter 210 performs maximum power point tracking (MPPT) control so as to maximize the power generated by the power generation apparatus 100 in accordance with a change in a radiation amount, a temperature, Lt; RTI ID = 0.0 > MPPT < / RTI > Meanwhile, the first converter 210 can minimize power consumption when there is no power generated by the power generation apparatus 100.

One end of the second converter 220 is connected to the first converter 210 and the battery 240, and the other end is connected to the load 300.

The second converter 220 converts the voltage of the DC power output through the first converter 210 or the voltage of the DC power output through the battery 240. The second converter 220 is a DC-DC converter that converts DC power of the first level into DC power of another level.

That is, in order to input the power output from the first converter 210 and / or the battery 240 to the load 300, the voltage needs to be converted into a voltage required by the load 300.

Accordingly, the second converter 220 converts the voltage of the DC power output from the first converter 210 and / or the battery 240 to the voltage required by the load 300.

For example, the second converter 220 may receive DC power of 52V from the first converter 210 and / or the battery 240 through the one end, It can output 48V DC power to the other end connected.

One end of the third converter 230 is connected to the first converter 210 and the battery 240, and the other end is connected to the load 300.

The third converter 230 converts the magnitude of the voltage of the DC power output through the first converter 210 or the voltage of the DC power output through the battery 240. The third converter 230 is a DC-DC converter that converts DC power of the first level into DC power of another level.

That is, in order to input the power output from the first converter 210 and / or the battery 240 to the load 300, the voltage needs to be converted into a voltage required by the load 300.

Therefore, the third converter 230 converts the voltage of the DC power output from the first converter 210 and / or the battery 240 to a voltage level required by the load 300.

For example, the third converter 230 may receive DC power of 52V from the first converter 210 and / or the battery 240 via the one end, The other end connected can output DC power of 27V.

One end of the battery 240 is connected to the first converter 210 and the other end is connected to the second converter 220 and the third converter 230.

The battery 240 receives the charging power from the first converter 210 connected through the one end in the charging mode, and performs the charging operation based on the received charging power.

Also, the battery 240 outputs the stored power in the discharge mode to the second converter 220 and the third converter 230 connected to the other end.

The battery 240 includes a battery pack composed of a plurality of battery cells for performing the charging operation and the discharging operation.

A plurality of battery cells included in the battery pack need to uniformly maintain the voltage of each battery cell in order to improve stability, life span, and high output.

A battery management system (BMS) 250 manages each battery cell to maintain a proper voltage while charging or discharging battery cells of the battery pack.

On the other hand, it is difficult for the plurality of battery cells to stably maintain the equilibrium state due to various factors such as a change in internal impedance. Accordingly, in the battery management system (BMS) 250, Function.

For example, a difference in charging state (STATE OF CHARGE, hereinafter referred to as SOC) between battery cells in the battery pack occurs due to a difference in discharge rates of battery cells in the battery pack. In order to overcome the capacity imbalance between the battery cells, a separate circuit for charging (BOOST) and / or discharging (BUCK) is configured for each battery cell.

The battery cells in the battery pack may be managed by a battery management system (BMS) 250 to maintain a constant voltage, and may be discharged by a battery management system (BMS) 250.

For example, the battery management system (BMS) 250 may detect the voltage of the battery cells and transmit the detected voltage to the system controller 260. The system controller 260 may supply DC power output through the first converter 210 to the battery 240 when the battery voltage falls below a lower limit value. In addition, when the battery voltage rises above the upper limit value, the system controller 260 can supply the electric power charged in the battery 240 to the second converter 220 and the third converter 230.

The battery cells constituting the battery 240 are preferably composed of a secondary battery capable of charging and discharging, but the present invention is not limited thereto.

Meanwhile, the battery management system (BMS) 250 may monitor the battery state including the SOC level, which is the state of charge of the battery 240. [ The battery management system (BMS) 250 may transmit the battery state information on the state of the battery 240 to the system control unit 260. For example, the battery management system (BMS) 250 monitors at least one of a voltage, a current, a temperature, a residual power amount, a life span, and a charging state of the battery 240, To the system control unit 260.

In addition to the balancing function, the battery management system (BMS) 250 may perform at least one of overcharge protection function, over discharge protection function, over current protection function, overvoltage protection function, and overheat protection function for the battery 240 can do.

Also, the battery management system (BMS) 250 may adjust the SOC level of the battery 240. [ Specifically, the battery management system (BMS) 250 receives a control signal from the system control unit 260 and can adjust the SOC level of the battery 240 based on the received control signal.

The heater 280 may include an exothermic resistance. The heater 280 can generate heat by the DC voltage as the DC voltage is input. The heater 280 may include not only the heating resistor but also a circulation member (not shown) for circulating heat generated in the heating resistor into the housing. The circulation member may include a fan for circulating heat generated in the heating resistor inside the housing by rotational movement.

The system controller 260 controls the power conversion operation of the first converter 210, the second converter 220 and the third converter 230 and controls the charging and discharging operations of the battery 240.

The system controller 260 causes the discharge of the battery 240 when the load 300 is overloaded so that the drive power of the load 300 is supplied by the power output by the discharge of the battery 240 . At this time, the system controller 260 may control the power output from the battery 240 to be supplied to the second converter 220 and the third converter 230.

The system controller 260 supplies DC power converted by the first converter 210 to the battery 240 when the load 300 is light load and supplies the DC power to the battery 240 To be charged. At this time, the system controller 260 can control the operation mode (charge mode and discharge mode) of the battery 240 according to the state of charge (SOC) of the battery 240.

Meanwhile, the system control unit 260 stores operating condition information of the load 300 and controls power supplied to the load 300 based on the stored operating condition information. The operating condition information may include driving time information of the load 300. The system control unit 260 may control the load 300 only when the operation of the load 300 is required, So that the driving power is supplied.

The system controller 260 may compare the power output from the first converter 210 with the output command value and control the path of the power output from the first converter 210 according to the comparison result. Here, the output command value may mean a command value for a driving power value required by the load 300, that is, an output power to be output to the load 300. [

For example, when the power output from the first converter 210 exceeds the output command value, the system controller 260 calculates the difference between the power output from the first converter 210 and the output command value And the corresponding power is supplied to the battery 240 so that the battery 240 can be charged. Accordingly, the battery 240 operates in the charging mode, and the second converter 220 and the third converter 230 operate in the charging mode, And can supply the corresponding power to the load 300. Fig.

If the power output from the first converter 210 is less than the output command value, the system controller 260 responds to the difference between the power output from the first converter 210 and the output command value The battery 240 can be controlled to discharge electric power. Accordingly, the battery 240 can operate in the discharge mode.

The second converter 220 and the third converter 230 convert the power output through the first converter 210 and the battery 240 so that the output command value As shown in Fig.

In this way, the system controller 260 can control the overall operation of the energy storage device 200 and determine the operation mode of the energy storage device 200 accordingly.

The operation mode of the energy storage device 200 includes a first operation mode in which the driving power of the load 300 is supplied using the power generated in the power generation apparatus 100 and a second operation mode in which the power generated in the power generation apparatus 100 is supplied A second operation mode for supplying the charging power of the battery 240 and the driving power of the load 300 by using the electric power and the electric power generated by the electric power generating apparatus 100 and the electric power charged in the battery 240 A third operation mode for supplying driving power to the load (300), a fourth operation mode for supplying charging power of the battery (240) using the electric power generated by the power generation apparatus (100) A fifth operation mode for supplying driving power to the load 300 using the electric power charged in the battery 240, and a fifth operation mode for supplying driving power for the battery 240 and the driving power for the load 300, 6 operation modes.

The system controller 260 controls the operation mode of the energy storage device 200 in consideration of the power generation amount of the power generation apparatus 100, the charging state of the battery 240, The operation of the first converter 210, the second converter 220, the third converter 230, and the battery 240 is set to one of the first to sixth operation modes, .

The system controller 260 may output control signals for controlling the switching operations of the switching elements included in the first to third converters 210, 220 and 230 according to the set operation mode. Here, the control signal may mean a signal capable of minimizing a loss due to power conversion of each converter through optimal control of a duty ratio according to an input voltage of each converter. To this end, the system controller 260 senses voltage, current, and temperature values at at least one of an input terminal and an output terminal of each converter, and generates and outputs the control signal based on the sensed voltage, can do.

In addition, the system controller 260 checks the state of charge of the battery 240, and controls supply of driving power to the battery management system (BMS) 250 according to the determined state of charge.

That is, the battery management system (BMS) 250 receives power required for driving from the battery 240, controls the operation of the battery 240 based on the supplied power, or controls the state of the battery 240 Monitoring.

At this time, when the output command value for the power to be supplied to the load 300 is high or the power output from the power generation apparatus 100 is low, the battery 240 does not operate in the charge mode, Mode. When the SOC level of the battery 240 is lowered to a predetermined lower limit value (for example, 5%) by continuous operation in the discharge mode or the sleep mode, the battery 240 is operated Shut down.

In this case, the battery management system (BMS) 250 does not receive the driving power due to the operation stop of the battery 240, so that the operation of the battery 240 can not be normally performed.

Accordingly, when the operation of the battery 240 is stopped, the system controller 260 determines whether or not there is power output from the power generation apparatus 100. When the power is output from the power generation apparatus 100, When power is present, the driving power of the battery management system (BMS) 250 is preferentially supplied by the power converted through the first converter 210.

The system control unit 260 drives the battery management system (BMS) 250 by the supplied driving power so that the battery management system (BMS) 250 charges the battery 240 .

The system control unit 260 controls the power consumption of the battery management system (BMS) 250 by the electric power charged in the battery 240 when the state of charge of the battery 240 reaches the SOC level of a certain level or more, To be supplied again.

That is, when the battery 240 is shut down, the operation of the battery management system (BMS) 250 is normally performed by resetting the entire system or performing a separate additional operation for normal operation of the battery 240 Respectively. However, according to the present invention, the battery power management system (BMS) 250 supplies different driving power to the battery 240 according to the state of the battery 240, thereby solving the above problems.

On the other hand, the system control unit 260 stores a heater driving condition for driving the heater 280. The system controller 260 outputs a control signal for driving the heater 280 according to the stored heater 280.

That is, the energy storage device 200 may be installed in the mountainous region according to the use environment of the load 300. [ At this time, the place where the energy storage device 200 is installed is lowered to minus 20 to 30 degrees in one winter, so that the temperature of the battery 240 may deviate from the standard range.

That is, the battery 240 may be a lithium ion battery, and the lithium ion battery should operate within a range of 0 to 40 degrees in order to realize a stable performance in terms of characteristics. Accordingly, the system controller 260 drives the heater 280 to control the temperature of the battery 240 to fall within the standard range.

At this time, the heater driving condition includes a heater driving start temperature, which is a reference for starting the driving of the heater 280, and a heater driving end temperature, which is a reference of driving end of the heater 280.

When the temperature of the battery 240 decreases below the heater driving start temperature, the system controller 260 drives the heater 280 to generate heat by the heater 280.

When the temperature of the battery 240 rises due to the driving of the heater 280 and the temperature of the battery 240 increases to be higher than the heater driving termination temperature, the system controller 260 controls the heater 280 are stopped.

At this time, the heater driving condition is considered by the temperature inside the housing, the charged state of the battery 240, the power consumption due to the driving of the heater, and the like.

That is, when the temperature of the battery 240 drops to 0 degrees or less, the heater 280 is driven, and when the temperature of the battery 240 rises to a certain level or more, the heater 280 is stopped The optimum heater driving is performed according to the current state by varying the driving conditions of the heater according to the state of charge of the battery 240 and the temperature inside the housing.

To this end, it is necessary to know the state of the inside of the housing, the battery temperature, the temperature change amount, the battery charge state, and the change state of the battery charge state change amount with time.

Table 1 shows changes in the temperature inside the housing, the battery temperature, the temperature change amount, the battery charge state, and the battery charge state change amount with the passage of time.

time chamber
Set
(-20 ° C) chamber
Temperature (℃) Shame
Temperature (℃) Battery HIGH (℃) Battery temperature
Change (℃) Battery LOW
(° C) SOC (%) SOC
Change (%) heater
condition 0 hours 9.0 9.0 9.0 9.6 7.7 35.3 OFF 0 hours and a half -20.0 -18.4 -2.6 9.5 0.0 7.6 35.3 0.0 OFF 1 hours -20.0 -19.2 -9.6 9.0 0.5 7.0 35.2 0.1 OFF 1 and a half hours -20.0 -19.1 -11.2 8.0 1.0 5.6 35.1 0.1 OFF 2 hours -20.0 -19.3 -12.6 6.8 1.2 4.2 35.1 0.0 OFF 2 and a half hours -20.0 -19.1 -12.9 5.4 1.4 2.3 35.0 0.1 OFF 3 hours -20.0 -19.2 -13.3 4.1 1.3 1.2 35.0 0.0 OFF 3 and a half hours -20.0 -19.1 -13.6 2.7 1.4 0.2 34.9 0.1 OFF 4 hours -20.0 -19.4 -14.2 1.6 1.1 -1.4 34.8 0.1 OFF Four and a half hours -20.0 -19.4 -14.3 0.4 1.2 -2.7 34.8 0.0 OFF 5 hours -20.0 -19.9 -14.3 -0.6 1.0 -3.8 34.0 0.8 ON 5 and a half hours -20.0 -19.4 -109 -1.6 1.0 -4.6 32.2 1.8 ON 6 hours -20.0 -19.3 -10.1 -1.5 -0.1 -5.1 30.4 1.8 ON 6 and a half hours -20.0 -19.4 -9.8 -0.8 -0.7 -5.4 28.7 1.7 ON 7 hours -20.0 -19.4 -9.9 0.0 -0.8 -5.7 27.5 1.2 OFF 7 and a half hours -20.0 -19.3 -12.4 0.0 0.0 -6.0 27.5 0.0 OFF 8 hours -20.0 -19.3 -11.7 -0.5 0.5 -6.6 26.6 0.9 ON 8 and a half hours -20.0 -19.2 -10.4 -0.8 0.3 -6.9 25.0 1.6 ON 9 hours -20.0 -19.3 -10.0 -0.6 -0.2 -7.0 23.4 1.6 ON 9 and a half hours -20.0 -19.3 -9.9 0.0 -0.6 -7.1 22.3 1.1 OFF 10 hours -20.0 -19.2 -13.0 -0.1 0.1 -7.3 22.3 0.0 OFF 10 and a half hours -20.0 -19.2 -10.9 -0.6 0.5 -7.7 20.7 1.6 ON 11 hours -20.0 -19.2 -10.2 -0.6 0.0 -7.7 19.1 1.6 ON 11 and a half hours -20.0 -19.2 -10.1 -0.5 -0.4 -7.7 17.5 1.6 ON 12 hours -20.0 -19.3 -12.9 0.0 -0.2 -7.8 17.5 0.0 OFF

According to Table 1, the internal temperature of the housing and the temperature of the battery 240 were at least about 9 ° C, and the power consumption per hour was about 4% at the time of operation of the heater 280.

Accordingly, in the present invention, when the temperature of the battery 240 is reduced to 0.5 DEG C or less in consideration of the internal temperature of the housing, the heater power consumption, and the battery temperature, the heater 280 is driven basically.

At this time, each of the converters constituting the energy storage device 200 includes a plurality of switching elements inside for energy conversion operation. The switching element may be a FET (Field Effect Transistor).

On the other hand, heat is generated in the switching elements of the respective converters in the state where the energy storage device 200 operates (in other words, the time when electric power is supplied to the load). The generated heat may raise the temperature of the battery 240. In other words, under the condition that the energy storage device 200 operates, the switching elements of the respective converters may perform some of the same functions as those performed by the heater 280.

In addition, the heat generated in the switching device of the converter varies according to the operating conditions of the energy storage device 200.

Accordingly, the system controller 260 can adjust the heater driving conditions according to the driving conditions of the respective converters according to the operation mode of the energy storage device 200. [

For example, if the operation mode of the energy storage device 200 is a mode in which only the battery charging is performed, only some of the plurality of converters operates, so that the amount of heat generated in the converter can be reduced, In a mode in which the supply is performed, all of the plurality of converters operate, and the amount of heat generated in the converter can be increased.

Therefore, the heater driving start temperature at the time of performing only the battery charging may be set to be higher than the heater driving starting temperature at the time when the power supply to the load is performed.

Also, the amount of change in the temperature of the battery 240 due to the heater driving is affected by the temperature inside the housing, and as the temperature inside the housing is lower, the rate of rise of the battery temperature is lowered.

Therefore, the heater driving termination temperature may be lowered as the internal temperature of the housing is higher. For example, when the temperature of the battery 240 reaches 0.5 ° C, the system controller 260 drives the heater 280 to generate heat in the heater 280.

The system controller 260 measures the temperature of the battery 240 and the temperature inside the housing while the heater 280 is being driven.

The system control unit 260 sets a driving termination temperature for terminating the driving of the heater 280 according to the measured inside temperature of the housing.

For example, if the inside temperature of the housing is -15 ° C or more, the heater driving end temperature may be set to 2 ° C, and if the inside temperature of the housing is less than -15 ° C, .

As described above, the system controller 260 sets the driving conditions of the heater 280 in consideration of the relationship between the heater internal power, the battery temperature, and the battery charging power.

According to the embodiment of the present invention, by supplying power to the load composed of the repeater and the camera using the power generated by the power generator, stable power can be supplied to the load in an area where the power can not be provided independently.

In addition, according to the embodiment of the present invention, the final output of the energy storage device is DC power instead of AC power, it is possible to eliminate an inverter that is necessarily included in a load such as a repeater, And the product volume can be made slim.

According to the embodiment of the present invention, when the operation of the battery management system is stopped due to the full discharge of the battery, the driving power of the battery management system is preferentially supplied using the power generated through the power generation device, An additional operation for restarting the operation of the battery management system is unnecessary and the system abnormal phenomenon caused by the operation stop of the battery management system can be prevented in advance.

3 is a view showing a detailed configuration of a load according to an embodiment of the present invention.

Referring to FIG. 3, the load 300 includes a camera 310, a first relay 320, and a second relay 330.

The camera 310 is disposed at a position where the load 300 is installed to acquire an image of the circumstance of the load 300 and transmits the acquired image to the system controller 260.

The camera 310 may be connected to the output terminal of the third converter 230 and may be driven by the DC power converted through the third converter 230.

The camera 310 may be selectively operated only at the time when the first repeater 320 and the second repeater 330 are driven in conjunction with the operations of the first repeater 320 and the second repeater 330, . ≪ / RTI >

The first repeater 320 and the second repeater 330 are a load 300 and perform signal relay between the mobile communication terminal and the mobile communication server.

In general, communication between the mobile communication terminal and the mobile communication server can not be smoothly performed in a mountainous area classified as a shaded area, and thus, a signal is relayed between the mobile communication terminal and the mobile communication server in the mountainous area, A repeater is installed.

At this time, the repeater is driven with a separate system power, which makes it difficult to control the power of the repeater.

Accordingly, in the present invention, the load 300 including the energy storage device 200 and the repeater is designed as one system as described above, so that the load So that the driving power is supplied to the repeater constituting the repeater 300.

The repeater may include a first repeater 320 and a second repeater 330 according to a product standard.

The first repeater 320 may be an RRH (Radio Remote Head), and its specification may be as shown in Table 2 below.

More information product name RRH (L8HU) Dimension (mm / WxDxH) 350.5 * 125 * 465 Input voltage (V) + 27DC Input current (A) 6.45A Power consumption (W) 175

The first repeater 320 is connected to the third converter 230 and receives the DC power converted through the third converter 230 and is driven by the received DC power.

Also, the second repeater 330 may be a mmWave repeater, and its specification may be as shown in Table 3 below.

More information product name mmWave Dimension (mm / WxDxH) 265 * 265 * 80 Input voltage (V) -48DC Input current (A) 1A Power consumption (W) 55

The second repeater 330 is connected to the second converter 220 and receives the converted DC power through the second converter 220 and is driven by the received DC power.

The operating conditions of the load 300 controlled by the system control unit 260 may be as shown in Table 3 below.

The first repeater 180W, The second repeater 60W Operating Hours / Day 12 Required Energy / Days 180W * 12hr = 2160W 60W * 12hr = 720W Controller Consumption 2W * 24h = 48Wh Power Conversion Efficiency > 85% Daily Consumption Energy 2160 / 0.85 + 48 = 2590 W 720 / 0.85 + 48 = 895 W Generator Specifications 300W * 6 = 1800W Sunshine 4hr / day Sunless Days 1day Battery Operation Range (SOC) 10 to 90% Required Battery Capacity 7843Wh Output 300W Operating Temperature -10 to 40 ° C

The system control unit 260 sets the operation conditions of the load 300 and sets the operation conditions of the respective converters, the operation state of the battery 240, and the operation state of the battery 240 so as to satisfy the above- An operation plan including a power generation state of the apparatus 100, and the operation of the energy storage device 200 according to the established operation plan.

FIG. 4 is a diagram illustrating a configuration of a first repeater and a second repeater shown in FIG.

Referring to FIG. 4, the repeater of any one of the first and second repeaters includes a DC-DC converter 321, an amplifier 322, and a controller 323.

The repeater receives DC power from the energy storage device 200. That is, in the conventional repeater, an inverter is disposed at a power input terminal, receives AC power from the outside, and converts the AC power into DC power through the inverter.

However, according to the present invention, DC power is outputted through the energy storage device 200 as described above, and the DC power outputted through the repeater is directly received, thereby eliminating the inverters provided in the repeater .

Accordingly, the amplifier 322 is driven by the power output through the energy storage device 200. [

Also, the power output from the energy storage device 200 is input to the DC-DC converter 321, and the DC-DC converter 321 converts the input power into the power required by each component of the repeater As shown in FIG.

That is, the DC-DC converter 321 converts DC power of 27V or 48V output from the energy storage device 200 to 5V or 12V according to the required power of the controller 323 that controls the overall operation of the repeater do.

5 is a graph showing output power of each converter of the energy storage device 200 according to an embodiment of the present invention.

Referring to FIG. 5, as shown in (a), the first converter 210 receives 120 V of DC power from the power generation apparatus 100. The first converter 210 converts the DC power of 120V into DC power of 52V according to the operation mode, and supplies the converted DC power to the second converter 220, the third converter 230, And the battery 230, respectively.

 5 (b), the second converter 220 receives DC power of 52 V from the first converter 210 and the battery 240. As shown in FIG. The second converter 220 converts the direct current power of 52V to the direct current power of 48V according to the operation mode, and outputs the converted direct current power to the second repeater 330 accordingly.

 5 (c), the third converter 230 receives DC power of 52 V from the first converter 210 and the battery 240. The third converter 230 converts the direct current power of 52V into the direct current power of 27V according to the operation mode and outputs the converted direct current to the first repeater 320 and the camera 310 do.

FIGS. 6 to 11 are views showing the flow of power supply according to each operation mode of the energy storage device 200 according to the embodiment of the present invention.

6 shows a power supply flow when the operation mode of the energy storage device 200 is the first operation mode for supplying the drive power of the load 300 using the power generated by the power generation apparatus 100 .

6, the first operation mode may be performed when the load 300 needs to be driven, and when the output command value of the load 300 is equal to the production power of the power generation apparatus 100 .

Accordingly, the power produced by the power generation apparatus 100 is supplied to the first converter 210, and the power is converted by the first converter 210. The DC power converted through the first converter 210 is supplied to the second converter 220 and the third converter 230 so that the DC power is converted into the DC power required by the load 300 And is output to the load (300). At this time, the power converted through the first converter 210 is not supplied to the battery 240, and the power charged in the battery 240 is also supplied to the second converter 220 and the third converter 230, .

7 is a flowchart illustrating an operation mode of the energy storage device 200 according to an embodiment of the present invention when the operation mode of the energy storage device 200 is a second operation mode in which the charging power of the battery 240 and the driving power of the load 300 are supplied It shows the power supply flow in case.

7, the second operation mode may be performed when the load 300 needs to be driven and the output command value of the load 300 is lower than the production power of the power generator 100 .

Accordingly, the power produced by the power generation apparatus 100 is supplied to the first converter 210, and the power is converted by the first converter 210. The DC power converted through the first converter 210 is supplied to the second converter 220 and the third converter 230 so that the DC power is converted into the DC power required by the load 300 And is output to the load (300). At this time, the power other than the power corresponding to the output command value among the power converted through the first converter 210 is supplied to the battery 240, and the battery 240 is charged accordingly.

8 is a timing chart illustrating an operation mode of the energy storage device 200 according to the third embodiment of the present invention. It shows the power supply flow when it is in operation mode.

8, the third operation mode may be performed when the load 300 needs to be driven and the output command value of the load 300 is higher than the production power of the power generator 100 .

Accordingly, the power produced by the power generation apparatus 100 is supplied to the first converter 210, and the power is converted by the first converter 210. The DC power converted through the first converter 210 is supplied to the second converter 220 and the third converter 230.

The battery 240 performs a discharging operation so that DC power output from the battery 240 by the discharge of the battery 240 is also supplied to the second converter 220 and the third converter 230, .

Accordingly, the second converter 220 and the third converter 230 receive the DC power from the power generation apparatus 100 and the battery 240, and supply the supplied DC power to the load 300 DC power, respectively, and then output.

9 is a flowchart illustrating a power supply flow in the case where the operation mode of the energy storage device 200 is the fourth operation mode of supplying the charging power of the battery 240 using the power generated by the power generation apparatus 100 Show.

Referring to FIG. 9, the fourth operation mode may be performed when the power of the load 300 is unnecessary and power generated by the power generation apparatus 100 exists.

Accordingly, the power produced by the power generation apparatus 100 is supplied to the first converter 210, and the power is converted by the first converter 210. The DC power converted through the first converter 210 is supplied to the battery 240 to charge the battery 240. At this time, the DC power converted through the first converter 210 is not supplied to the second converter 220 and the third converter 230, and the second converter 220 and the third converter 230 Is not performed.

10 shows a power supply flow when the operation mode of the energy storage device 200 is a fifth operation mode for supplying driving power to the load 300 using the electric power charged in the battery 240. [

Referring to FIG. 10, the fifth operation mode is a time required for driving the load 300, and may be performed when power generated by the power generation apparatus 100 does not exist.

Accordingly, the power output from the power generator 100 does not exist, so that the operation of the first converter 210 is not performed. As a result, the power output through the first converter 210 does not exist.

The battery 240 performs a discharging operation to output DC power to the second converter 220 and the third converter 230. The second converter 220 and the third converter 230 receive DC power from the battery 240 and convert the supplied DC power into DC power required by the load 300 Output.

11 shows a power supply flow that appears when the operation mode of the energy storage device 200 is the sixth operation mode that does not supply both the charging power of the battery 240 and the driving power of the load 300. [

Referring to FIG. 11, the sixth operation mode may be performed when the operation of the load 300 is unnecessary, and the power generated by the power generation apparatus 100 does not exist.

At this time, the first converter 210, the second converter 220, and the third converter 230 are all in an operation stop state, and accordingly, the battery 240 also stops operating or remains in a standby state for operation.

12 shows an operation mode according to a charged state of a battery according to an embodiment of the present invention.

Referring to FIG. 12, the SOC level of the battery can be divided into 0 to 100%. The maximum reference value of the SOC level may be limited to 95%, and the battery 240 maintains a normal operation state when the SOC level falls within the range of 95% to 10%.

When the SOC level drops below 10%, the battery 240 operates in the standby mode until the SOC level reaches 5%, which is the minimum reference value.

When the SOC level drops below 5%, the battery 240 is in an operation stop state.

13 is a diagram showing a power supply flow to a load according to an embodiment of the present invention.

Referring to FIG. 13, when all the energy of the battery 240 is discharged, a predetermined delay time T1 from the power generation apparatus 100 until sufficient power for operating the energy storage apparatus 200 is produced, And the size of the predetermined time T1 may be changed according to power generation conditions of the power generation device (for example, a plurality of solar conditions).

For example, in the morning after consuming all the energy of the battery 240, a T1 period is generated as shown in FIG. 13, and the interval of T1 may vary according to the solar radiation time.

Accordingly, the system controller 260 according to the present invention controls the battery 240 or the auxiliary battery (not shown) to be driven during the T1 interval such that the interval of T1 is minimized or the interval T1 does not exist. do.

That is, the system controller 260 can determine whether the T1 period is generated based on a time point at which driving power to the load 300 should be generated. This may be determined by the timing of supplying the driving power to the load 300, the state of charge of the battery 240, and the expected amount of electric power to be generated in the power generator 100.

Accordingly, when the T1 period occurs, the system controller 260 may drive a separate auxiliary battery or output information indicating that the T1 period is generated, thereby solving the problem caused by the occurrence of the T1 period .

FIG. 14 is a detailed configuration diagram of the energy storage device 200 according to the second embodiment of the present invention.

14, the energy storage device 200 includes a first converter 210, a second converter 220, a third converter 230, a battery 240, a BMS 250, and a system controller 260 . Hereinafter, in the description of FIG. 14, the description of the components that function substantially the same as those of the components shown in FIG. 2 will be omitted.

Referring to FIG. 14, in comparison with the energy storage device 200 shown in FIG. 2, the configuration of the system controller 260 and the configuration of the auxiliary battery 270 are the same as those of the energy storage device 200 according to the first embodiment of the present invention. Device 200 as shown in FIG.

The energy storage device 200 according to the second embodiment of the present invention includes a first controller 261 operating in a first charged state of the battery 240 and a second controller 262 operating in a second charged state of the battery 240. [ 2 < / RTI >

The first control unit 261 has the same function as the system control unit 260 shown in FIG. 2, and thus a detailed description thereof will be omitted.

The first controller 261 operates by the power supplied through the battery 240 when the battery 240 is charged, that is, when the SOC level is between 95% and 5%.

The battery management system (BMS) 250 periodically monitors the SOC level of the battery 240, and when the SOC level of the battery 240 is lowered to less than 5%, the first control unit 261 It is determined whether or not a situation in which normal driving can not be performed occurs.

When the SOC level of the battery 240 drops below 5%, the battery management system (BMS) 250 stops the operation of the first control unit 261, The operation of the energy storage device 200 is controlled by the second controller 262.

When the SOC level of the battery 240 drops below 5%, the battery management system (BMS) 250 drives the auxiliary battery 270 to discharge the auxiliary battery 270 .

The battery management system (BMS) 250 supplies driving power to the second control unit 262 by the electric power generated by the discharge of the auxiliary battery 270.

The second controller 262 controls the operations of the first converter 210, the second converter 220, and the third converter 230 according to the power supplied from the auxiliary battery 270. That is, do.

As described above, in the present invention, the system control unit 260 is configured by a plurality of control units, and the plurality of control units operate in accordance with the SOC level of the battery 240. Accordingly, the energy storage device 200 according to the present invention can accurately recognize the state of charge of the battery 240 and can detect the operation error of the energy storage device 200, which occurs according to the state of charge of the battery 240, So that it can be prevented in advance.

FIGS. 15 to 17 are flowcharts for explaining an operation method of the energy storage system according to an embodiment of the present invention, step by step.

First, referring to FIG. 15, the power generation apparatus 100 generates electric energy (operation 100).

Then, the system control unit 260 determines whether power supply to the load 300 is required (Step 110). That is, the system control unit 260 determines whether or not power supply to the load 300 is necessary based on whether the current time is the time at which power is supplied to the load 300, and whether the load 300 is overloaded or lightly loaded .

If the power supply to the load 300 is not required, the system controller 260 supplies power to the battery 240 according to the electric energy generated through the power generator 100, (Step 120). Accordingly, the first converter 210 receives the power generated through the power generation apparatus 100, and performs the power conversion operation to supply the generated power to the battery 240. At this time, the power converted through the first converter 210 is not supplied to the second converter 220 and the third converter 230, so that the second converter 220 and the third converter 230 230 are not operated.

If it is necessary to supply power to the load 300, the system controller 260 determines whether the battery 240 needs to be discharged (operation 130). That is, the system controller 260 can not satisfy the electric power demand of the load 300 only by the electric energy supplied by the power generation apparatus 100, and can determine whether the battery 240 needs to be discharged.

If it is necessary to discharge the battery 240, the system controller 260 controls the battery 240 to discharge the battery 240 (operation 140).

Accordingly, the power converted through the first converter 210 and the power discharged through the battery 240 are selectively supplied to the second converter 220 and the third converter 230. The second converter 220 and the third converter 230 receive the supplied power and convert the received power into DC power of a required magnitude in the load 300 (step 150).

The DC power converted through the second converter 220 and the third converter 230 is directly supplied to the respective components of the load 300 (operation 160).

Referring to FIG. 16, the system controller 260 communicates with the battery management system (BMS) 250 to periodically check the SOC level of the battery 240 (step 200).

Then, the system controller 260 determines whether the SOC level of the battery 240 has dropped below a minimum reference point (step 210). Here, the minimum reference point may be 5% of the SOC level, and accordingly, the system controller 260 determines whether the SOC level of the battery 240 is less than 5%.

If the SOC level of the battery 240 is less than 5%, the operation of the battery 240 and the operation of the battery management system (BMS) 250 are suspended (step 220).

In operation 230, the system controller 260 determines whether there is electric energy generated through the power generation apparatus 100 in the state where the system operation is suspended.

The system control unit 260 controls the operation of the battery management system (BMS) 250 using the electric energy generated through the power generation apparatus 100 when the electric energy generated through the power generation apparatus 100 exists Power is supplied (step 240).

Accordingly, the battery management system (BMS) 250 is resumed to operate by the supplied driving power, so that the battery 240 can be charged using electric energy generated through the power generation apparatus 100 (Step 250).

The system controller 260 determines whether charging of the battery 240 is equal to or greater than a reference point (step 260). That is, the system controller 260 determines whether the SOC level of the battery 240 has increased to 5% or more or 10% or more.

If the SOC level of the battery 240 rises to 5% or more, or 10% or more, the system controller 260 determines that the battery 240 is not powered by the power generation device 100, To supply the driving power of the battery management system (BMS) 250 (step 270).

Referring to FIG. 17, the system controller 260 communicates with the battery management system (BMS) 250 to periodically check the SOC level of the battery 240 (step 300).

Then, the system controller 260 determines whether the SOC level of the battery 240 has dropped below a minimum reference point (step 210). Here, the minimum reference point may be 5% of the SOC level, so that the system controller 260 determines whether the SOC level of the battery 240 is less than 5%.

If the SOC level has decreased to less than 5%, the system controller 260 determines whether the current state is a state in which power supply to the load 300 is required (operation 320). In this case, the present step 320 may be performed in the battery management system (BMS) 250.

If the current state requires power supply to the load 300, the system controller 260 drives the auxiliary battery 270 to discharge the auxiliary battery 270 (operation 330). At this time, the system controller 260 controls the energy storage device 200 by the first controller 261 of the plurality of controllers.

Subsequently, the driving power is supplied to the second controller 262 as the auxiliary battery 270 is driven, and the second controller 262 operates according to the supplied driving power (operation 340). At this time, the first control unit 261 is in a state in which the driving power is not supplied through the battery 240, and the operation is stopped.

The second controller 262 is operated by the driving power supplied through the auxiliary battery 270 and is connected to the first converter 210 and the second converter 220 constituting the energy storage device 200, And the third converter 230, thereby supplying power to the load 300 (step 350).

18 to 20 are flowcharts for explaining the steps of the method of driving the heater of the energy storage device 200 according to the embodiment of the present invention.

Referring to FIG. 18, the energy storage device 200 measures a temperature inside a housing (step 400). The internal temperature of the housing may vary according to an external temperature and a driving state of the converter provided in the housing.

The energy storage device 200 measures the temperature of the battery 240 (step 420).

Then, the energy storage device 200 calculates power consumption required for driving the heater 280 (step 420).

Next, the energy storage device 200 confirms the relationship between the internal temperature of the housing, the battery temperature, and thus the heater power consumption (step 430), determines a driving condition for driving the heater 280 according to the determined relationship (Step 440).

The driving condition of the heater 280 includes a heater driving start temperature at which driving of the heater 280 starts and a heater driving end temperature at which the driving of the heater 280 is terminated.

The driving start temperature of the heater may vary depending on the internal temperature of the housing and the state of charge of the battery 240 depending on the heater power consumption.

The driving termination temperature of the heater 280 may also vary depending on the internal temperature of the housing and the state of charge of the battery 240 depending on the heater power consumption.

Next, referring to FIG. 19, the energy storage device 200 measures the temperature of the heat generated in the switching device of the converter according to the operating condition of the converter (operation 500).

The energy storage device 200 measures a temperature inside the housing and a temperature of the battery which vary according to the measured heating temperature (operation 510).

Next, in step 520, the energy storage device 200 determines a temperature change according to the heating temperature based on the measured internal temperature of the housing and the battery temperature.

In step 530, the energy storage device 200 adjusts the previously set heater driving start temperature and the heater driving end temperature on the basis of the determined temperature change.

Referring to FIG. 20, the system controller 260 measures the temperature of the battery 240 (step 600).

Then, the system control unit 260 confirms the operating condition of the converter (step 610). Here, the operating condition of the converter is related to the inside temperature of the housing, and the system control unit 260 can check the inside temperature of the housing instead of checking the operating condition of the converter.

In operation 620, the system controller 260 sets a heater start temperature at which the heater starts to be driven according to an operating condition of the converter, that is, an internal temperature of the housing.

In operation 630, the system controller 260 determines whether the measured temperature of the battery 240 has decreased below the set heater start temperature.

As a result of the determination, when the temperature of the battery decreases to be lower than the heater driving start temperature, the system controller 260 supplies driving power to the heater 280 to generate heat in the heater 280 step).

In addition, the system controller 260 measures the temperature of the battery 240 that changes according to the driving of the heater 280 (operation 650).

In operation 660, the system controller 260 determines whether the temperature of the battery 240 has risen to or above a predetermined heater driving termination temperature.

If the temperature of the battery 240 rises above the predetermined heater driving end temperature, the system controller 260 stops driving the heater (step 670).

Here, the heater driving termination temperature may be set in accordance with the internal temperature of the housing in the step 620.

Alternatively, the temperature inside the housing may be further measured during driving of the heater, and the heater driving termination temperature for stopping the driving of the heater 280 may be additionally set according to the measured inside temperature of the housing. The heater driving termination temperature may be increased or decreased in inverse proportion to the internal temperature of the housing.

According to the embodiment of the present invention, by supplying power to the load composed of the repeater and the camera using the power generated by the power generator, stable power can be supplied to the load in an area where the power can not be provided independently.

In addition, according to the embodiment of the present invention, the final output of the energy storage device is DC power instead of AC power, it is possible to eliminate an inverter that is necessarily included in a load such as a repeater, And the product volume can be made slim.

According to the embodiment of the present invention, when the operation of the battery management system is stopped due to the full discharge of the battery, the driving power of the battery management system is preferentially supplied using the power generated through the power generation device, An additional operation for restarting the operation of the battery management system is unnecessary and the system abnormal phenomenon caused by the operation stop of the battery management system can be prevented in advance.

According to an embodiment of the present invention, the above-described method can be implemented as a code readable by a processor on a medium on which a program is recorded. Examples of the medium that can be read by the processor include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, etc., and may be implemented in the form of a carrier wave (e.g., transmission over the Internet) .

The embodiments described above are not limited to the configurations and methods described above, but the embodiments may be configured by selectively combining all or a part of the embodiments so that various modifications can be made.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention.

100: generator
200: Energy storage device
210: first converter 220: second converter
230: Third converter 240: Battery
250: Battery management system 260: System control unit
270: Secondary battery
300: load

Claims (8)

A method of driving a heater of an energy storage device,
Measuring a first internal temperature inside the housing in which the energy storage device is housed;
Setting a first reference temperature for starting driving of the heater according to the measured first internal temperature;
Measuring battery temperature; And
And driving the heater if the measured battery temperature is below the first reference temperature
A method of driving a heater of an energy storage device. The method according to claim 1,
Further comprising the step of confirming a driving condition of the converter constituting the energy storage device,
The first reference temperature may be, for example,
Is determined by the heat generation temperature generated in the switching element of the converter according to the driving condition of the converter
A method of driving a heater of an energy storage device. The method according to claim 1,
Further comprising the step of confirming a state of charge of the battery,
The first reference temperature may be, for example,
Is determined by the power consumption according to the driving of the heater based on the charged state of the battery
A method of driving a heater of an energy storage device. The method according to claim 1,
Setting a second reference temperature for driving termination of the heater; And
Stopping the operation of the heater when the temperature of the battery reaches the set second reference temperature or more
A method of driving a heater of an energy storage device. 5. The method of claim 4,
Further comprising the step of measuring a second internal temperature inside the housing that changes as the heater is driven,
The second reference temperature is a temperature
And the second internal temperature
A method of driving an energy storage device. 6. The method of claim 5,
The second reference temperature is a temperature
And decreases as the second internal temperature increases
A method of driving an energy storage device. 6. The method of claim 5,
Further comprising the step of confirming a driving condition of the converter constituting the energy storage device,
The second reference temperature is a temperature
Which is determined by the second internal temperature and the heat generation temperature generated in the switching element of the converter according to the driving condition of the converter
A method of driving a heater of an energy storage device. 6. The method of claim 5,
Further comprising the step of confirming a state of charge of the battery,
The second reference temperature is a temperature
Is determined by the power consumption according to the driving of the heater based on the charged state of the battery
A method of driving a heater of an energy storage device.

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