KR101227835B1 - The battery charger with battery management system - Google Patents

Abstract

PURPOSE: A charging device with a storage battery management function is provided to reduce maintenance costs by allowing charging part operations, a charging current control, and an operation status monitoring to be performed locally and remotely. CONSTITUTION: A control part(200) includes a charging part voltage monitoring part(211), a charging part output setting part(212), a storage battery cell monitoring part, and a storage battery defect determination part(230). The charging part voltage monitoring part detects the voltage of a charging part. The charging part output setting part sets up the output voltage of the charging part. The storage battery cell monitoring part detects the storage battery cell voltage during a preset unit testing time. The storage battery cell monitoring part includes a cell voltage input part and a reference voltage setting part. [Reference numerals] (100) Charging part; (211) Charging part voltage monitoring part; (212) Charging part output setting part; (220) Storage battery cell monitoring part; (230) Storage battery defect determination part; (240) Communication part; (300) Cell; (400) Display part; (600) Load; (700) Remote monitoring device; (AA) Commercial power input; (BB) Network

Description

Battery charger with battery management function {The Battery Charger with Battery Management System}

The present invention relates to a charging device having a battery management function. More particularly, the present invention relates to a charging device having a battery management function capable of efficiently managing a battery by detecting a battery operating state and determining whether a battery is defective.

In most cases, a battery connected to a charging device is used by connecting several cells in series or in parallel depending on the voltage and capacity used. In this case, when one or two cells are in a bad state, if the abnormality of the commercial power is generated, the problem of inability to supply stable power to the load equipment during the planned outage compensation time occurs, so the battery management is a very important management item. .

However, in the current system, it is very difficult to cut off the power supply to important loads that must be operated at all times because the power supply is to be stopped and the battery must be checked at the time of battery check. Therefore, if the system is configured to check the battery without interrupting the power supply during the load, the efficiency of battery management can be greatly improved.

As a prior art, Korean Patent Laid-Open Publication No. 1999-0073842 discloses a method for determining a failure of a backup battery, which includes a technique of sequentially measuring cell voltages of a backup battery in a unit of time during a forced discharge and remotely transmitting them to an operator. As the cell voltage is measured, the voltage variation between cells due to the difference in measurement time may be different, and there is a problem in that continuity of the power supplied to the load cannot be maintained when the voltage suddenly drops due to a bad cell during a forced discharge.

The present invention has been made to solve the above problems, an object of the present invention is to maintain the continuity of the power supply to the load while determining the failure of the battery through the charge and discharge test of the battery storage battery that can replace the defective battery It is to provide a charging device having a management function.

In order to solve the above problems, a charging device having a battery management function according to an embodiment of the present invention is a charging unit for supplying power to a load and a battery by converting the commercial power into a DC power, a battery consisting of at least one cell, each battery The display unit for displaying the operation state information of the cell, and the charging unit voltage monitoring unit for detecting the voltage of the charging unit, the output voltage of the charging unit, and the cell voltage of each battery detected during the discharge test is within the range of the predetermined voltage variation tolerance If it is determined that the deviation, the charging unit output setting unit for controlling the charging unit outputs the rated output voltage, the battery cell monitoring unit for detecting the battery cell voltage for a set unit test time and the voltage of each cell of the battery generated by the battery cell monitoring unit Use the data to calculate the average voltage of each cell and compare them The battery cell determination unit detects a battery cell discharged to a predetermined value or less relative to an average voltage, and determines that the battery cell is a defective cell. The battery cell monitoring unit is connected to each photo relay output terminal of each cell of the battery cell. According to the first selection signal applied, the cell voltage input unit for sequentially outputting the nth cell voltage and the (n + 1) th cell voltage to the reference voltage setting unit and the first photo relay or the second photo relay according to the second selection signal And a reference voltage setting unit configured to set the n-th cell voltage to be input to the differential amplifier as a reference voltage for detecting the (n + 1) -th cell voltage.

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According to an aspect of an embodiment of the present invention, the charging unit output setting unit may control the discharge end voltage to be set higher than the battery end voltage during the discharge test.

According to an aspect of an embodiment of the present invention, the control unit transmits management information such as battery charge and discharge test result data, whether a cell is defective, operation state of a charging device, and measurement data to a remote monitoring device through a network. It is characterized by.

According to the present invention as described above, by measuring the voltage of each individual cell of the battery at the same time at the time of charging and discharging the battery of the battery and at the same time detect the voltage level according to the difference between the two cell voltage to generate the cell voltage data, respectively Minimize errors in voltage fluctuations that occur when each individual cell is measured sequentially (within a few seconds), and cell defects can be more accurately determined even with a slight difference in the remaining capacity of the battery.

In addition, if the output voltage of the battery input to the load exceeds the allowable range of the load device during the discharge test of the battery, the continuity of the power supply can be maintained by immediately stopping the discharge test of the battery and supplying power to the load by the charging unit. have.

In addition, since the operation of the charging unit, the charging current control, and the monitoring of the operation state can be performed locally and remotely, the integrated charging device can be managed efficiently, thereby securing the safety of the power supplied to the load and reducing the maintenance cost. It is effective.

1 is a block diagram of a charging device having a battery management function according to an embodiment of the present invention.
2 is a flowchart illustrating a process of determining a storage battery failure according to an embodiment of the present invention.
Figure 3 is a graph showing the battery charge and discharge test results according to an embodiment of the present invention.
4 is a view illustrating an external display of a state of a storage battery according to an exemplary embodiment of the present invention.
5 is a circuit diagram illustrating an operation of a battery cell monitoring unit according to an exemplary embodiment of the present invention.

The following detailed description is only illustrative, and merely illustrates embodiments of the present invention. In addition, the principles and concepts of the present invention are provided for the purpose of explanation and most useful.

Accordingly, various forms that can be implemented by those of ordinary skill in the art, as well as not intended to provide a detailed structure beyond the basic understanding of the present invention through the drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a charging device having a battery management function according to an embodiment of the present invention.

As shown in FIG. 1, the charging device 1000 having a battery management function of the present invention receives a commercial power source and converts the DC power into a charging unit 100 that supplies power to the load 600 and the battery 300. A battery 300 including at least one cell, a display unit 400 for displaying operation state information of each cell of the battery, and an output voltage of the charging unit are set, and a voltage input from each cell of the battery is sensed during a charge and discharge test. And a control unit 200 for determining whether the storage battery is defective. In addition, the control unit 200 of the charging device 1000 controls the battery charging and discharging test result data, whether the cell is defective, the operating state of the charging device, measurement data, and the like, to the remote monitoring apparatus 700 through the network. Can transmit

The charging unit 100 converts commercial power (AC power) into DC power by using an electric transformer, a rectifier, a filter, and the like to supply a safe power to the load 600 and a plurality of loads. Supplying power to the battery 300 made of a cell performs a function to charge the battery. In addition, the charging unit 100 uses the DC power charged in the storage battery 300 by setting the output voltage of the controller during charging and discharging tests when an abnormality occurs in the power supply from the commercial power source or to determine the failure of each battery cell. The battery is discharged to supply the load. That is, the charging unit 100 supplies DC power to the load and the storage battery under the control of the control unit 200, and when an abnormality (outage, etc.) occurs in the commercial power supply, the charging unit 100 discharges the accumulator so that stable power is supplied to the load. .

The display unit 400 may receive a control of an administrator, perform a function of displaying management information such as an operation state of the charging device to the outside, and may include a touch screen. That is, the display unit 400 displays the various control parameters, operation modes, and communication methods of the charging device to the outside to perform a function as an input unit for receiving a control command from an administrator, and at the same time, the rated voltage, rated capacity, and total load current of the battery. The state of the storage battery such as information can be displayed to the outside in real time under the control of the controller (see FIG. 4).

The controller 200 generally controls the operation of the charging apparatus 1000.

The charging unit voltage monitoring unit 211 detects the current state of the charging unit 100 by sensing the magnitude of the charging voltage input from the charging unit 100, and the charging unit output setting unit 212 may detect the charging current when the charging voltage is detected. By outputting a control command, the charging of the storage battery 300 may be controlled by controlling the amount of current output from the charging unit 100. In addition, the charging unit output setting unit 212 controls to drop the voltage output from the charging unit 100 during the discharge or charge test to test the failure of each cell of the battery 300 to supply power to the load from the battery 300. The battery 300 may be discharged during the test measurement time.

The battery cell monitoring unit 220 detects a voltage output from each cell constituting the battery 300 in real time when discharging and charging to generate respective cell voltage data, and the battery failure determining unit 230 is the battery cell. By comparing the cell voltage data generated by the monitoring unit 200 with each other after arithmetic processing, it is possible to determine whether a cell is defective.

The communication unit 240 is composed of communication modules such as RS-232C, RS-485, MODBUS, TCP / IP, and the like, such as battery charge and discharge test result data, whether a cell is defective, operation state of a charging device, measurement data, etc. By transmitting the management information to the remote monitoring apparatus 700 or another device, the administrator can manage the operating state of the charging device even from a remote location.

On the other hand, in order to accurately accumulate battery cell defects, the charging and discharging test must be performed while the battery is fully charged, so that the control unit 200 checks the latest discharge record of the charging device stored in the storage unit (not shown), and then after the charging and discharging test. When the 48 hours have not elapsed and the abnormality of the commercial power is detected through the charging unit voltage monitoring unit 211 during the charging and discharging test, the charging and discharging test is controlled. In addition, the controller 200 immediately stops the charging and discharging test when it is determined that a sudden voltage drop occurs out of the range of the voltage variation tolerance of the cell through the battery cell monitoring unit 220 during the charging and discharging test. By controlling the charging unit to output the rated output voltage through the setting unit 212 it is possible to maintain the continuity of the power supplied to the load.

In addition, when setting the discharge end voltage below the end voltage of the battery through the charging unit output setting unit 212 during the discharge test, the control unit 200 is discharged to the end battery voltage in a short time due to a defective cell of the battery 300 load ( Since the low voltage is supplied to 600), the continuity of the power supply cannot be maintained during the discharge test, so that the discharge end voltage cannot be set below the battery end voltage.

Hereinafter, a process of controlling the charging apparatus 1000 having the battery management function to perform a charge and discharge test to determine a failure of each cell of the battery will be described.

Here, the discharge end voltage and the rated output voltage outputted from the charging unit under the control of the charging unit output setting unit 212 are voltages within the allowable range of the load device capable of maintaining the continuity of the power supply without interrupting the power supply of the load device. .

2 is a flowchart illustrating a process of determining a storage battery failure according to an embodiment of the present invention.

When each battery cell is connected in series, each battery cell drops rapidly from full charge voltage to nominal voltage at the beginning of discharge, and the discharge time varies depending on the load, but especially for cells with insufficient capacity or bad cells. The voltage drop in the same time is greater than that of the normal cell. In addition, when the battery starts to be recharged after discharge, the battery cell rapidly rises to a certain voltage within a short time, and the charging time varies depending on the amount of charging current, but in the case of a cell in which the remaining capacity is insufficient or a defective cell, the voltage rise within the same time is higher than that of the normal cell. Even bigger.

As shown in FIG. 2 using the characteristics of the battery having the defective cell described above, the control unit 200 receives the discharge end voltage setting command input by the user through the display unit, and the charging unit outputs the discharge end voltage at the rated output voltage. The battery is discharged so that power is supplied from the battery to the load by controlling the battery to be supplied (S20). Thereafter, the controller 200 senses each cell voltage at the time of discharge and determines whether it exceeds the range of the voltage variation tolerance. If the controller 200 determines that there is a sudden voltage drop outside the range of the voltage variation allowance, the controller 200 may control the charging unit to output the rated output voltage to maintain the continuity of power supply to the load (S30). ).

Next, the control unit 200 calculates the average voltage of each cell using the voltage data of each cell of the storage battery generated by the battery cell monitoring unit during the set unit test time, and compares and judges the average voltage of the cells, and discharges it below a predetermined value compared to the average voltage. The defective battery cell is detected and judged to be a defective cell (see S22, FIG. 3A).

Next, when each cell is discharged to the discharge end voltage, the controller 200 controls the charging unit to output the rated output voltage (S24), thereby charging and storing the battery by supplying power to the load. Next, the control unit 200 calculates the average voltage of each cell using the voltage data of each cell of the storage battery generated by the battery cell monitoring unit during the set unit test time, and compares and determines the average voltage of each of the cells, and charges a predetermined value or more with respect to the average voltage. The defective battery cell is determined to be defective (S25, see FIG. 3B).

Finally, the controller 200 transmits the detected defective cell information (battery status information) to the remote sensing device through the network, and the remote manager immediately checks the received battery status information and exchanges the defective cells. Maintenance can be performed easily.

5 is a circuit diagram illustrating an operation of a battery cell monitoring unit according to an exemplary embodiment of the present invention.

As shown in FIG. 5, the battery cell monitoring unit 220 of the controller is configured such that each cell of the battery is connected to each photo relay output terminal, and the n-th cell voltage is sequentially changed by a first selection signal applied to the photo relay input terminal. According to the cell voltage input unit 510 for outputting the (n + 1) th cell voltage to the reference voltage setting unit and the second selection signal, the first photo relay or the second photo relay is operated so that the n th cell voltage is (n + 1). The reference voltage setting unit 520 is set to be input to the differential amplifier as a reference voltage for detecting the) th cell voltage.

When the cell voltage input unit 510 is connected to the output terminal of each photo relay and each cell is applied to the input terminal of the photo relay, the cell voltage is input from the output terminal of the photo relay to which the battery cell is connected. 520). The first selection signal is controlled to output cell voltages of cells 0 and 1 at T0 time, cells 1 and 2 at T1 time, and cells 2 and 3 at T2 time, that is, at Tn time. The n-th cell and the (n + 1) -th cell voltages may be sequentially input to the first photo relay 521 and the second photo relay 522 of the reference voltage setting unit 520. Here, the test time from T0 to Tn, which measures the cell voltage during the discharge test, is measured at almost the same time within several tens of ms, thereby minimizing the variation error of the battery cell voltage caused by the external environment.

On the other hand, the n-th and (n + 1) -th cell voltages input to the first photo relay 521 and the second photo relay 522 may be the first photo relay 521 or the operation selected by the second selection signal. The nth cell voltage is set to a reference voltage for detecting the voltage level of the (n + 1) th cell voltage by the second photo relay. Here, when the second selection signal is HIGH, the Va voltage becomes LOW by the inverter 524, the Vb voltage becomes HIGH by the inverter 523, and the second photo relay is operated by the Vcc power supply. When the signal is LOW, the Va voltage becomes HIGH by the inverter 524, the Vb voltage becomes LOW by the inverter 523, and the first photo relay is operated by the Vcc power supply.

Referring to the operation of the reference voltage setting unit 520 in detail by the second selection signal, the cell voltage input unit 510 outputs the cell 0 and the cell 1 voltage by the first selection signal at time T0. 2 Since the selection signal becomes HIGH and only the second photo relay 522 is operated, the first output terminal a of the second photo relay 522 to which the cell No. O is input is the inverting terminal (-) of the differential amplifier 800. The second output terminal (b) of the second photo relay 522, which is inputted as a reference voltage and the first cell voltage is input, is input to a non-inverting (+) terminal of the differential amplifier 800. The differential amplifier 800 amplifies and outputs the voltage level corresponding to the difference between the positive voltages, and the first cell voltage data is generated through the AD converter 900.

The cell voltage input unit 510 continuously outputs the first and second cell voltages by the first selection signal at T1 time, and the second selection signal becomes LOW so that only the first photo relay 521 is operated. The first output terminal c of the first photo relay 521 to which the cell voltage is input is input to the inverting (-) terminal of the differential amplifier 800 to become a reference voltage, and the first photo relay to which the second cell voltage is input. The second output terminal d of 521 is input to the non-inverting (+) terminal of the differential amplifier 800. The differential amplifier 800 amplifies and outputs a voltage level corresponding to a difference between positive voltages, and second cell voltage data is generated through the AD converter 900.

Accordingly, the cell voltage data may be generated according to the continuous operation of the cell voltage input unit 510 and the reference voltage setting unit 520 of the battery cell monitoring unit 220, and the n th cell voltage is (n + 1). Since the voltage level equal to the difference between the positive voltages is input to the AD converter 900 as the reference voltage for detecting the first cell voltage, the voltage fluctuation even if the battery cell voltage is changed due to the external environment such as the fluctuation of commercial power. There is little error of.

Therefore, the charging device 1000 having the battery management function continuously performs the charging and discharging tests to detect the defective cells, and minimizes the error of the voltage variation by measuring the cell voltage of each battery at about the same time within the same test time. Defects can be judged more accurately.

The present invention has been described in detail with reference to exemplary embodiments, but those skilled in the art to which the present invention pertains can make various modifications without departing from the scope of the present invention. Will understand.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

100: charging unit 200: control unit
211: charging unit voltage monitoring unit 212: charging unit output setting unit
220: battery cell monitoring unit 230: battery failure determination unit
240: communication unit 300: storage battery
400: display unit 510: cell voltage input unit
520: reference voltage setting unit 521: first photo relay
522: second photo relay 523,523: inverter
600: Load 700: Remote monitoring device
800: differential amplifier 900: AD converter
1000: charging device

Claims (5)

Charging unit for supplying power to the load and storage battery by converting the commercial power into DC power,
A battery consisting of at least one cell,
Display unit for displaying the operation status information of each cell of the battery and
The charging unit voltage monitoring unit for detecting the voltage of the charging unit sets the output voltage of the charging unit, and when it is determined that the cell voltage of each battery detected during the discharge test is outside the preset voltage variation tolerance range, the charging unit is rated output voltage. The charging unit output setting unit for controlling the output unit, the battery cell monitoring unit for detecting the battery cell voltage during the set unit test time and the average voltage of each cell using the voltage data of each cell of the battery generated by the battery cell monitoring unit Comprising a control unit including a battery failure determination unit for calculating and comparing them to each other and detects the battery cells discharged below a certain value compared to the average voltage to determine the defective cells,
The battery cell monitoring unit
Each cell of the storage battery is connected to each photo relay output terminal, and the cell voltage sequentially outputs the n-th cell voltage and the (n + 1) -th cell voltage to the reference voltage setting unit by the first selection signal applied to the photo relay input terminal. Input section and
A reference voltage setting unit configured to operate the first photo relay or the second photo relay according to the second selection signal so that the n th cell voltage is input to the differential amplifier as a reference voltage for detecting the (n + 1) th cell voltage; Charging device having a battery management function comprising.
delete delete The method of claim 1,
The charging unit output setting unit is a charging device having a battery management function, characterized in that for controlling the discharge end voltage is set higher than the battery end voltage during the discharge test.
The method of claim 4, wherein
The control unit
The charging device having a battery management function further comprises a communication unit for transmitting the management information including the battery charge and discharge test result data, whether the cell is defective, the operating state of the charging device, the measurement data to the remote monitoring device through the network.

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