KR101638435B1 - Charge and discharge method of high precision smart charge and discharge apparatus for performance evaluation of redox flow battery - Google Patents

Abstract

In the present invention, disclosed are a high-precision smart charge and discharge apparatus to evaluate performance of a redox flow battery and a method thereof, capable of optimizing the efficiency of a battery and a charger/discharger by enabling temperature-dependent charge and discharge to minimize heating when charging or discharging while not only realizing optimized charge and discharge conditions by classifying charge and discharge in three steps and automatically detecting a type of the battery but also increasing the performance of charge and discharge. The high-precision smart charge and discharge apparatus to evaluate performance of a redox flow battery according to an embodiment of the present invention comprises: a converter to convert an analog signal into a digital signal in response to a control signal from a power conversion unit; a main controller to control an operation command from the converter; a central processing unit to receive various signals from the main controller and to perform calculation and control; and the power conversion unit to convert AC into DC or the DC into the AC in response to a driving signal from the central processing unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a high precision smart charge / discharge method for evaluating the performance of a redox flow cell,

The present invention relates to a high-precision smart charging and discharging apparatus and method thereof, and more particularly, to a smart-type charging and discharging apparatus and method thereof, which are capable of automatically detecting the type of battery by dividing charging and discharging into three stages and realizing optimum charging and discharging conditions, The present invention relates to a high-precision smart charge / discharge device for evaluating the performance of a redox flow cell capable of optimizing the efficiency of a battery and a charge / discharge device by performing charge / discharge in a temperature-dependent differential mode in order to minimize heat generation during charging / discharging.

An energy storage system (hereinafter abbreviated as ESS) is a storage device that stores excess power and transmits power when power shortage occurs. It is used to stabilize the output when producing renewable energy such as solar and wind power. In addition, as a new power storage system that can be used in emergencies such as power outages, a lot of research and development is under way.

ESS storage methods include Lithium Ion Battery (LIB), Sodium Sulfur Battery (SaS), Redox Flow Battery (RFB), and Compressed Air Storage System (CAFS).

Among them, Redox Flow Battery is increasing in utilization due to 10,000 cycle life and 10 years life.

However, most charging and discharging devices for evaluating the properties of secondary batteries are optimized for lithium ion batteries (nominal voltage 4.2V, driving voltage 3.7V). In other words, it is difficult to ensure reliability of data due to low precision due to the use of the conventional charge / discharge device, such as a redox flow battery, which is operated at 1.2 V or less, and a strict level of reliability is required. It is difficult to prove the reliability of product verification because no standard is established.

Therefore, in order to activate the ESS industry, it is necessary to develop a high-precision charge / discharge device for evaluating the characteristics of low-voltage operation such as redox flow battery.

A related prior art is Korean Patent Laid-Open Publication No. 10-2012-0088064 (published Aug. 8, 2012), which discloses a battery energy storage system.

Disclosure of the Invention The object of the present invention is to provide a method and an apparatus for separating charge and discharge by three stages and automatically detecting a battery type to realize optimum charge and discharge conditions, Discharging device to optimize the efficiency of the battery and the charge / discharge device, and to provide a high-precision smart charging / discharging device for evaluating performance of a redox flow cell.

According to an aspect of the present invention, there is provided a high-precision smart charge / discharge device for evaluating the performance of a redox flow cell, comprising: a converter for converting an analog signal into a digital signal in response to a control signal from a power conversion unit; A main controller for controlling an operation command from the converter; A central processing unit for receiving various signals from the main controller to perform calculation and control; And a power conversion unit for converting an alternating current into a direct current or converting a direct current into an alternating current in response to a drive signal from the central processing unit.

According to an aspect of the present invention, there is provided a high-precision smart charge / discharge method for evaluating the performance of a redox flow cell, including: (a) determining an Over-Voltage Protection (OVP) (CC / CV, CP, CR) current set value and a charge / discharge mode (CC / CV, CP, CR) voltage set value; (b) comparing and comparing the current set value of the charge / discharge mode (CC / CV, CP, CR) and the battery measured current value of the battery; (c) comparing and comparing the OTP set value and a battery temperature value that measures the battery temperature; And comparing the set voltage value of the charge / discharge mode (CC / CV, CP, CR) with the battery measured voltage value of the measured battery voltage.

A high-precision smart charge / discharge device for evaluating the performance of a redox flow cell according to the present invention divides charge and discharge into three stages to automatically detect a battery type to realize optimum charge and discharge conditions, The efficiency of the battery and the charge / discharge device can be optimized by charging / discharging by a temperature-dependent differential method in order to minimize heat generation during charging / discharging.

Also, since the high-precision smart charge / discharge device for evaluating the redox flow cell performance according to the present invention and the method thereof are optimized for evaluating physical properties of a redox-flow battery driven at a low voltage of 2 V or less, , Zinc-air secondary battery and so on.

As a result, the high-precision smart charge / discharge device for evaluating the performance of the redox flow cell according to the present invention has a high accuracy of ± 0.1% in order to evaluate the characteristics of redox flow cell driven at 1.2 V, The discharge function can measure voltage and current within ± 0.1% (FS) tolerance range.

In addition, the high-precision smart rechargeable discharge device and method for evaluating redox flow cell performance according to the present invention not only improves durability and reliability by securing charge / discharge control technology of redox flow battery, Storage System's bidirectional power control capability makes it possible to manage energy in real time by proper charge and discharge rather than fuel supply.

1 is a view for explaining a redox flow cell.
2 is a circuit schematic diagram showing a high-precision smart charge / discharge device for evaluating redox flow cell performance according to an embodiment of the present invention.
3 is a perspective view illustrating a high-precision smart charge / discharge device for evaluating redox flow cell performance according to an embodiment of the present invention.
4 and 5 are diagrams for explaining a high-precision smart charge / discharge method for evaluating redox flow cell performance according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but may 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 scope 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.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a high-precision smart charging and discharging device for evaluating redox flow performance according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view for explaining a redox flow cell.

1, the redox flow battery 1 is typically connected to a generator 30 or a power system or a demand generator 40 through an AC / DC converter 20, And discharges the electric power system or the demand source 40 as a power supply target.

The redox flow cell 1 includes a positive electrode cell 2 containing a positive electrode 4, a negative electrode cell 3 containing a negative electrode 5, a positive electrode 2 and a negative electrode 3, And a diaphragm 10 for separating and appropriately transmitting ions. A tank 6 for a positive electrode electrolyte is connected to the positive electrode cell 2 through a positive electrode electrolyte conduit 8 and a negative electrode electrolyte tank 7 is connected to the negative electrode cell 103 via a negative electrode electrolyte conduit 9. The positive and negative electrode electrolyte conduits 8 and 9 are provided with first and second pumps 11 and 12 for respectively circulating electrolytes of the positive and negative electrodes.

The redox flow cell 1 is connected to the positive electrode cell 2 and the negative electrode cell 3 by using the positive and negative electrode electrolyte conduits 8 and 9 and the first and second pumps 11 and 12, The positive and negative electrode electrolytes respectively stored in the tanks 6 and 7 are respectively circulated and supplied and the charge and discharge are carried out in response to the change reaction of the metal ions serving as the active material in the positive and negative electrode electrolytic solutions.

In order to evaluate the performance of the redox flow battery, the present invention provides a high-precision smart charge / discharge device and a method thereof, which will be described in detail with reference to the accompanying drawings.

FIG. 2 is a circuit diagram showing a high-precision smart charge / discharge device for evaluating the performance of a redox flow cell according to an embodiment of the present invention. FIG. 3 is a circuit diagram of a high- Fig.

Referring to FIGS. 2 and 3, a high-precision smart rechargeable discharge device 100 for evaluating redox flow cell performance according to an embodiment of the present invention includes a converter 110, a main controller 120, a central processing unit 130, And a conversion unit 140.

The converter 110 converts an analog signal into a digital signal in response to a control signal from the power conversion unit 140.

The main controller 120 serves to control an operation command from the converter 110.

The central processing unit 130 receives various signals from the main controller 110 and performs calculation and control. At this time, various signals include a PMW periodic pulse signal, a PMW duty pulse, a PMW delay pulse signal, a start signal, and a synchronization signal. can do.

The power conversion unit 140 converts an AC current into a DC current or converts a DC current into an AC current in response to a drive signal from the central processing unit 130.

Also, the high-precision smart rechargeable discharge device 100 for evaluating the redox flow cell performance according to the embodiment of the present invention may further include a main body 105, a display portion 150, and a grip portion 160.

The main body 105 accommodates the converter 110, the main controller 120, the central processing unit 130, and the power conversion unit 140. For this, the main body 105 may have a rectangular parallelepiped shape having a receiving space therein, but the present invention is not limited thereto.

The display unit 150 is mounted on one side of the main body 105 and displays performance evaluation items of the redox-flow battery. At this time, the display unit 150 may be a touch screen.

The grip portion 160 is mounted for the purpose of gripping the main body 105 by a user. The handle 160 may be mounted on both sides of one side of the main body 105 by welding or the like, but the present invention is not limited thereto.

The high-precision smart charging / discharging device for evaluating the performance of the redox flow cell according to the embodiment of the present invention divides the charging / discharging into three stages to automatically detect the battery type to realize the optimum charging / discharging condition, The efficiency of the battery and the charge / discharge device can be optimized by charging / discharging by a temperature-dependent differential method in order to minimize the heat generation during charging / discharging while increasing the characteristics.

Also, since the high-precision smart charge / discharge device for evaluating the performance of the redox flow cell according to the embodiment of the present invention is optimized for evaluating physical properties of a redox-flow battery driven at a low voltage of 2 V or less, , Zinc-air secondary battery and so on.

Hereinafter, a high-precision smart charging / discharging method for evaluating the redox flow cell performance according to an embodiment of the present invention will be described in more detail.

4 and 5 are diagrams for explaining a high-precision smart charge / discharge method for evaluating redox flow cell performance according to an embodiment of the present invention. At this time, FIG. 4 shows a charge control flow chart, and FIG. 5 shows a discharge control flowchart.

As shown in FIGS. 4 and 5, the high-precision smart charging and discharging method for evaluating redox flow cell performance according to an embodiment of the present invention includes a set value input step S1, a battery current measuring step S2, A step S3 and a battery voltage measurement step S4.

Enter setting value

In the set value input step S1, over-voltage protection (OVP), over-current protection (OCP) and over-temperature protection (OTP) And the charge / discharge mode (CC / CV, CP, CR) voltage setting value.

Battery current measurement

The battery current measuring step S2 compares the current value of the charging / discharging mode (CC / CV, CP, CR) with the battery measuring current value of the battery.

At this time, if the battery measurement current value is equal to the charge / discharge mode (CC / CV, CP, CR) current setting value, the battery temperature measurement step S3 is performed.

If the battery measured current value is smaller than the OCP set value, the cycle ends. At this time, when the battery measured current value is smaller than the OCP set value, the OCP alarm is transmitted to the display unit to inform the user of the cycle end time.

When the battery measured current value is smaller than the set value of the charge / discharge mode (CC / CV, CP, CR), the PWM duty is decreased. If it is greater than or equal to the set value, the PWM duty is increased.

Battery temperature measurement

In the battery temperature measuring step S3, the OTP set value and the battery temperature are compared to determine the battery temperature value.

If the battery temperature value is higher than or equal to the OTP setting value, the cycle ends. When the battery temperature value is lower than the OTP setting value, the current accumulation and energy state (SOC) are calculated.

Battery voltage measurement

In the battery voltage measuring step (S3), the charge / discharge mode (CC / CV, CP, CR) voltage set value and the battery voltage measured value are compared with each other.

At this time, when the battery measuring voltage value is greater than the charging mode (CC / CV, CP, CR) voltage setting value in the charging mode, the battery current measuring step S2 is executed again.

If the battery measurement voltage value is less than or equal to the charge mode (CC / CV, CP, CR) voltage setting value, the battery measurement voltage value is compared with the OVP setting value. If it is small, end the cycle. If the battery measurement voltage value is less than or equal to the OVP setting value, the PWM duty is decreased. At this time, if the battery measurement voltage value is smaller than the OVP set value, the OVP alarm is set to be notified to the user to inform the user of the cycle end time.

In addition, in the charge mode, after the PWM duty is reduced, the battery current remeasurement value re-measured is calculated, and when the battery current remeasurement value is 0, charging is terminated and the battery current remeasurement value Is not 0, the battery temperature measuring step (S3) is executed again.

On the other hand, in the discharge mode, the battery current measurement value is calculated based on the calculated values of the current integration and the energy state (SOC). When the battery current measurement value is 0, the discharge is ended. , The battery current measuring step S3 is executed again.

The high-precision smart charging and discharging method for evaluating the performance of the redox flow cell according to the embodiment of the present invention divides the charging and discharging into three stages to automatically detect the battery type to realize optimum charging and discharging conditions, The efficiency of the battery and the charge / discharge device can be optimized by charging / discharging by a temperature-dependent differential method in order to minimize the heat generation during charging / discharging while increasing the characteristics.

Also, since the high-precision smart charge / discharge method for evaluating redox flow cell performance according to the embodiment of the present invention is optimized for evaluating physical properties of a redox-flow battery driven at a low voltage of 2 V or less, , Zinc-air secondary battery and so on. Accordingly, the high-precision smart charge / discharge device for evaluating the performance of the redox flow cell according to the embodiment of the present invention has a high accuracy of ± 0.1% for evaluating the characteristics of redox flow cell driven at 1.2 V, The charge and discharge function of CP and CR mode can measure voltage and current within ± 0.1% (FS) tolerance range.

Also, according to the embodiment of the present invention, the high-precision smart charge / discharge method for evaluating the redox flow cell performance not only improves durability and reliability by securing charge / discharge control technology of the redox flow battery, Storage System's bidirectional power control capability makes it possible to manage energy in real time by proper charge and discharge rather than fuel supply.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. These changes and modifications may be made without departing from the scope of the present invention. Accordingly, the scope of the present invention should be determined by the following claims.

100: charge / discharge device
110: Converter
120: Main controller
130:
140:
S1: Setting value input step
S2: Battery current measurement step
S3: Battery temperature measurement step
S4: Battery voltage measurement step

Claims (10)

delete delete delete delete (a) Over-Voltage Protection (OVP), Over-Current Protection (OCP) and Over-Temperature Protection (OTP) set values and charge / discharge mode (CC / CV, CC / CV, CP, and CR) voltage setting values;
(b) comparing and comparing the current set value of the charge / discharge mode (CC / CV, CP, CR) and the battery measured current value of the battery;
(c) comparing and comparing the OTP set value and a battery temperature value that measures the battery temperature; And
(d) comparing and comparing the battery voltage measured value of the charge / discharge mode (CC / CV, CP, CR) voltage value and the measured battery voltage value. Smart charge / discharge method.
6. The method of claim 5,
In the step (b)
(C) if the battery measured current value is equal to the charge / discharge mode (CC / CV, CP, CR) current set value,
If the battery measured current value is less than the OCP set value, the cycle ends,
(CC / CV, CP, CR) current value when the battery measured current value is smaller than the set current value of the charge / discharge mode (CC / CV, Wherein the PWM duty is increased when the value is greater than or equal to the set value.
6. The method of claim 5,
In the step (c)
If the battery temperature value is equal to or higher than the OTP setting value, the cycle ends,
Wherein the current accumulation and the energy state (SOC) are calculated when the battery temperature value is lower than the OTP setting value.
6. The method of claim 5,
In the step (d)
In the charge mode, if the battery measurement voltage value is greater than the charge mode (CC / CV, CP, CR) voltage setting value,
If the measured battery voltage value is less than or equal to the set voltage value of the charging mode (CC / CV, CP, CR), the battery measured voltage value is compared with the OVP set value, Wherein the PWM duty is decreased when the measured battery voltage value is less than or equal to the OVP set value.
9. The method according to any one of claims 7 to 8,
In the step (d)
The battery current measurement value is calculated based on a value obtained by calculating the current integration and the energy state (SOC), and when the battery current measurement value is 0, the discharge is ended. When the battery current measurement value is 0 , The battery current measuring step is re-executed.
9. The method of claim 8,
In the charging mode,
After the PWM duty is reduced, the battery current remeasurement value re-measured is calculated. When the battery current remeasurement value is 0, charging is terminated. If the battery current remeasurement value is not 0 Wherein the step of measuring the temperature of the battery is repeated.

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