KR20120136120A - Battery evaluation method having charging and discharging function - Google Patents

Abstract

PURPOSE: A battery test method is provided to make it possible that charging and discharging of a battery continuous by controlling charge voltage of a battery. CONSTITUTION: A controlling unit measures(S910) an open circuit voltage. The controlling unit discharges a battery. The controlling unit obtains(S920) information of a current state. The controlling unit charges(S930) a battery. The controlling unit evaluates the current state of a battery based on the information of a state. [Reference numerals] (AA) Start; (BB) End; (S910) Measuring battery opening voltage; (S920) Obtaining information on current battery condition; (S930) Charging battery

Description

Battery evaluation method having a charge and discharge function {Battery evaluation method having charging and discharging function}

The present invention relates to a battery evaluation method having a charge / discharge function, and more specifically, charge and discharge function for charging and discharging a battery at regular intervals and calculating the remaining capacity of the battery by using a discharge voltage or a discharge current. It relates to a battery evaluation method having a.

Rectifiers are devices that charge batteries that supply energy for operation during high-voltage switchboard power outages. When the power is always outage is extremely limited, so the battery is less used time, that is, the discharge time is almost always maintained the state of charge. In order to maintain the life of the battery, the charging and discharging must be properly maintained. Since the rectifier focuses on the charging function, there is no discharge control. Therefore, the battery used in the rectifier has a problem that the charge and discharge cycles are extremely small and the service life is short.

On the other hand, similar to the rectifier, induction light or lighting that operates in an emergency is an evacuation mechanism that allows people to evacuate by operating for a predetermined time when a power outage occurs. Induction and emergency lighting use batteries as energy sources to operate for a certain period of time. In order to faithfully perform the magnetic functions of the induction lamp and the emergency lamp, the state of charge of the battery is very important. When the storage battery ages and the storage capacity drops, the induction lamp and the emergency light cannot operate for a predetermined time (about 60 minutes).

Conventional induction lamps and emergency lamps have to black out the induction lamp and the emergency lamp for a certain time to check the remaining capacity of the battery. If a large number of induction lights and emergency lights are installed, it takes time to check the operation. If a certain time passes during the inspection, it is difficult to evaluate the effectiveness of the operation for the induction lights and emergency lights after that time.

For this reason, the user generally operates the check switch without powering down the induction lamp and the emergency lamp to determine only the operation and failure. However, even if there is no abnormality by operating the check switch, there is a problem in that it is not guaranteed that the induction lamp and the emergency lamp can be maintained for a certain time.

Therefore, in the technical field to which the present invention belongs, it has been required to develop an invention that can extend the service life of the battery and check the remaining capacity of the battery in real time.

Accordingly, the present invention has been made to solve the problems described above, to extend the service life of the battery, to display the remaining capacity of the battery during charging, and to provide an invention that can self-diagnose the failure of the battery The purpose is.

In addition, an object of the present invention is to provide a charge and discharge of the battery can be made continuously by controlling the charge voltage of the battery.

However, the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

An object of the present invention described above, the control means 300, the step of measuring the open voltage of the battery 100 (S910); Obtaining, by the control means 300, the current state information of the battery 100 by discharging the battery 100 (S920); And charging the battery 100 by the control means 300 (S930), wherein the control means 300 evaluates the current state of the battery 100 based on the current state information. It can be achieved by providing a battery evaluation method having a discharge function.

In addition, the step S910, the control means 300 outputs a control signal to the mode switching means 400 (S911); Acquiring the open voltage by separating the battery 100 from the power supply means 600 and the load 800 according to the control signal by the mode switching means 400 (S913); And calculating, by the control means 300, the initial residual capacity of the battery 100 by using the open voltage (S915).

In addition, the current state information, characterized in that at least one of the remaining capacity, available time, and the discharge current of the battery 100.

In addition, the current state of the battery 100 is a failure of the battery 100, the determination of the failure of the battery 100 is characterized by determining by measuring the amount of change of the discharge current.

In operation S920, as the battery 100 is discharged from the current voltage to a predetermined voltage, the current state information is measured by measuring at least one of the discharge current, the discharge capacity, the discharge time, and the voltage change amount of the battery 100. It is characterized by obtaining.

In operation S920, the control unit 300 calculates a predetermined capacity from the current voltage to the predetermined voltage by discharging the battery 100 according to the discharge characteristic curve of the battery 100 from the current voltage to a predetermined constant voltage. (S921); Calculating, by the control means 300, the usable capacity of the battery 100 by obtaining the arrival time from the current voltage to a predetermined minimum voltage according to the discharge characteristic curve (S923); And calculating, by the control means 300, the current capacity of the battery 100 by obtaining the time of arrival from the current voltage to a predetermined end voltage according to the discharge characteristic curve (S925).

In addition, the discharge characteristic curve is characterized by a 10-hour rate.

In addition, the minimum voltage is characterized in that the minimum voltage of the battery 100 to operate at least one of the rectifier, induction lamp, and emergency light.

In operation S923, the available time of the battery 100 may be calculated by differentiating the usable capacity by the discharge current.

In addition, the final voltage is characterized in that the lowest voltage of the battery 100 that can be recharged after discharging the battery (100).

In addition, the constant capacity, usable capacity, and the current capacity is characterized by calculating based on the following [Equation].

[Mathematical Expression]

Where Q is the capacitance of the capacitor, i is the discharge current, and t is the time.

The display unit 500 may further include displaying at least one of a failure of the battery 100, an available time of the battery 100, and a remaining capacity of the battery 100. .

According to the present invention as described above, by monitoring the remaining use time and rated capacity of the battery, it is effective to extend the service life of the battery by controlling the charge and discharge cycle of the battery.

In addition, according to the present invention it is possible to continuously supply the energy of the battery to the rectifier or induction lamps and lights operated in an emergency, there is an effect that does not become a power failure.

In addition, according to the present invention, the use time of the induction lamp and the emergency lamp, the percent capacity of the battery, or the failure diagnosis without the need of shutting down the induction lamp and the emergency lamp or operating the check switch for a predetermined time to check the remaining capacity of the battery. There is an effect that can be done.

The following drawings, which are attached to this specification, illustrate one preferred embodiment of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention. It should not be construed as limited.
1 is a configuration diagram showing the configuration of a battery evaluation device having a charge and discharge function according to the present invention,
2 is a block diagram showing the configuration of the battery monitoring means according to the present invention,
3 is a view showing a discharge characteristic curve of a battery according to the present invention,
Figure 4 is a block diagram showing the configuration of the mode switching means according to the present invention,
5 is a configuration diagram showing a configuration of an open voltage mode according to the present invention;
6 is a configuration diagram showing the configuration of the discharge mode according to the present invention,
7 is a block diagram showing a configuration of a charging mode according to the present invention,
8 to 10 are flowcharts sequentially showing a battery evaluation method having a charge and discharge function according to the present invention.

Hereinafter, with reference to the drawings will be described a preferred embodiment of the present invention. In addition, the embodiment described below does not unduly limit the content of the present invention described in the claims, and the entire structure described in this embodiment is not necessarily essential as the solution means of the present invention.

<Configuration of Battery Evaluator with Charge / Discharge Function>

1 is a block diagram showing the configuration of a battery evaluation device having a charge and discharge function according to the present invention, Figure 2 is a block diagram showing the configuration of a battery monitoring means according to the present invention, Figures 3 to 6 the present invention Fig. 7 is a view showing the configuration of the mode switching means and the configuration of the state mode according to the present invention. Fig. 7 is a view showing a discharge characteristic curve of a battery according to the present invention.

As shown in FIG. 1, the battery evaluating apparatus having the charge / discharge function according to the present invention has a battery 100, a battery monitoring means 200, a control means 300, a mode switching means 400, and a display means. 500, the power supply means 600 performs a battery abnormality and charge / discharge function. Hereinafter, a configuration of a battery evaluating apparatus having a charge / discharge function according to the present invention will be described with reference to FIGS. 1 to 7.

The battery 100 according to the present invention is a standby power supply device used in a rectifier for supplying emergency power to an induction lamp or a lighting lamp that is driven in an emergency, or for supplying power in case of a high voltage switchboard power failure. At this time, since the battery is extremely limited in case of constant power failure, the battery is almost always kept in a state of charge because it is less used time, that is, discharge time. Charging and discharging must be maintained properly for the battery to maintain its life. A typical rectifier focuses on the charging function, so there is no control over discharge. Therefore, batteries used in rectifiers, induction lamps, or lamps tend to have a short life cycle due to extremely low charge and discharge cycles.

Therefore, the control means 600 which will be described later may extend the life of the battery by performing the charging and discharging functions of the battery.

On the other hand, the battery 100 outputs a voltage of 3.3v, it can be implemented as a secondary battery of Ni-MH or Li-ion type.

The battery monitoring means 200 according to the present invention is a means for monitoring the state of the battery 100 to obtain state information of the battery. The battery monitoring means 200 updates the state information of the battery based on information of any one of temperature, current, and voltage from the battery 100. The control means 300 to be described later based on the state information of the battery determines the available remaining capacity or failure of the battery 100.

2 is a configuration diagram showing the configuration of the battery monitoring means 200. As shown in FIG. 2, the battery monitoring means 200 is an internal block diagram of the DS2756, which is a dedicated battery gauge chip, and measures and transmits state information of the battery in real time through the 1-Wire communication protocol and the control means 300 to be described later. . Therefore, it is possible to implement a simple dedicated chip without a separate hardware configuration for measuring the state information of the battery, thereby reducing the data throughput of the control means 300.

The control means 300 according to the present invention outputs a signal for selectively controlling any one of the state modes of the open voltage mode, the discharge mode, and the charge mode to obtain the state information of the battery to the mode switching means 400 to be described later. do. In addition, the current state of the battery 100 is diagnosed based on the state information obtained according to the change of the state mode.

Here, in the charging mode, the charging is performed when the charging voltage is higher than the battery voltage. In contrast, in the discharging mode, the charging is performed when the charging voltage is lower than the battery voltage.

At this time, the current state of the battery indicates the remaining capacity of the current battery 100 or whether the battery 100 is broken based on the state information. The failure of the battery may be determined by detecting a change amount of the discharge current measured in the discharge mode, which will be described later. That is, when the discharge current of the battery becomes zero or the discharge current is not constantly discharged while being discharged while being discharged, it is possible to detect the abnormality of the battery 100.

On the other hand, the remaining capacity of the battery 100 can be calculated as follows. As shown in FIG. 3, the discharge characteristics of the battery according to the 10-hour rate may be described by a graph of a straight line, which will be described below. In addition, the discharge characteristic curve shown in FIG. 3 may be stored in advance by a look-up table or the like, and the control means 300 may calculate the remaining capacity of the current battery as follows.

First, the control means 300 discharges the current voltage of the battery 100 to a constant voltage. At this time, by discharging the discharge current discharged over time, the capacity up to a constant voltage lowered from the current voltage of the battery 100 can be obtained, as shown in Equation 1 below.

Where Q is the capacitance of the capacitor, i is the discharge current, and t is the time.

The time from the moment when the voltage is lowered by the control means 300 to the minimum voltage reaches the minimum voltage by extending the falling curve according to the time from the current voltage of the battery to the constant voltage lowered to the minimum voltage at which the rectifier or emergency light operates. Obtain

The available capacity of the battery 100 is obtained by extending the capacity from the current voltage of the battery down to a constant voltage until the reaching moment up to the minimum voltage by the discharge curve. At this time, it is calculated by Equation 1, t ₀ is the time of the current voltage and t ₁ is the time when the minimum voltage is reached. The available time of the battery is determined by differentiating the available capacity of the battery by the discharge current of the battery.

The falling curve according to the time from the current voltage of the battery down to the constant voltage is extended to the end voltage of the battery to obtain the time from the moment when the control means 300 falls to the end time of reaching the end voltage of the battery.

In this case, the termination voltage is the minimum voltage at which the battery 100 can perform the functions of charging and discharging. In other words, the battery is not recharged when discharged below the final voltage. Moreover, it becomes the rated capacity of the battery 100 up to a terminal voltage.

On the other hand, the current capacity of the battery is obtained by extending the capacity from the current voltage of the battery 100 down to a constant voltage until the moment of reaching the terminal voltage of the battery by the discharge curve. At this time, it is calculated by Equation 1, t ₀ is the time of the current voltage and t ₁ is the time when the end voltage is reached.

Divide the battery's current capacity by the battery's rated capacity and multiply by 100 to find the current percentage capacity of the battery. By knowing the current capacity of the battery, you can find the available time of the current battery.

The control means 300 having the above-described function may be implemented by an analog circuit, a digital circuit, or a combination thereof. In particular, digital circuits may be implemented using MCUs, MPUs, DSPs, and the like, and may also be implemented by integrated circuit designs such as FPGAs or ASICs. Of course, it will be apparent to those skilled in the art that a memory (not shown) in which a program for driving the control means 300 is stored is required.

Mode switching means 400 according to the present invention is a means for switching to the state mode for checking the current state of the battery based on the signal of the above-described control means 300. At this time, the state mode is switched to the open voltage measurement mode, the discharge mode, or the charge mode as necessary.

Here, as shown in FIG. 4, the mode switching means 400 includes relay switches 410 and 420 including relay driving units 411 and 421 for mode switching. The relay driving units 411 and 421 are excited by the control signal of the control unit 300 to induce switching of the switch.

Meanwhile, as shown in FIG. 5, the open voltage mode is a mode for measuring the open voltage of the battery for determining the initial remaining capacity before performing the battery life prediction. Therefore, in order to measure the initial remaining capacity of the battery 100, the battery is separated from the load 800 and the power supply means 600 to measure the battery cell voltage in the open state.

Meanwhile, as shown in FIG. 6, the discharge mode is a mode constituting an artificial discharge state of the battery in an uninterruptible state for calculating the remaining life through the change in the discharge amount and the battery voltage required for discharge in the actual load driving state. to be.

Meanwhile, as shown in FIG. 7, the charging mode recharges the battery 100 to a maximum charging point when the lowest charging point of the battery that guarantees the minimum operating time of the emergency induction lamp or the rectifier is determined in the discharge mode. Mode to do this.

The display means 500 according to the present invention displays whether the battery 100 has failed, the expected operating time of the battery 300, or the remaining capacity of the battery based on the signal of the control means 300. The display means 500 may be implemented by 7-segment or LCD.

The power supply unit 600 according to the present invention converts the AC power supplied from the AC power supply unit 700 into DC power to supply the mode switching means 400, the control circuit, and a voltage for charging the battery. The power supply unit 600 may be implemented as an SMPS switching power supply.

< Charging and discharging  Battery evaluation method with function>

8 to 10 are flowcharts sequentially showing a battery evaluation method having a charge and discharge function according to the present invention. An embodiment of a battery evaluation method that can be performed by a battery evaluating apparatus having a charge / discharge function having the above-described configuration is shown in FIG. 8. Hereinafter, a battery evaluation method having a charge / discharge function according to the present invention will be described in detail with reference to FIGS. 8 to 10.

First, the control means 300 performs a step (S910) of measuring the open voltage of the battery 100. In order to measure the open voltage of the battery 100, the control means 300 outputs a control signal capable of performing the open voltage measurement mode to the mode switching means 400.

Here, by measuring the open voltage, the control means 300 may calculate the initial remaining capacity of the battery 100. The initial remaining capacity calculation of the battery 100 is as follows.

First, the control means 300 outputs a control signal to the mode switching means 400 to switch to the open voltage measurement mode (S911).

Next, the mode switching unit 400 separates the battery 100 from the power supply unit 600 and the load 800 according to the control signal to obtain an open voltage (S913).

Next, the control means 300 calculates the initial residual capacity of the battery 100 using the open voltage (S915). In this case, the initial residual capacity can be calculated by the above Equation 1, but the initial residual capacity can be calculated by applying the current value obtained by dividing the open voltage of the battery by the resistance of the battery to Equation 1. have.

Next, after performing the above-described step S910, the control means 300 discharges the battery 100 to obtain the current state information of the battery 100 (S920). At this time, the current state information of the battery 100 is obtained by using the discharge current, the discharge capacity, the discharge time, or the voltage change amount measured as the battery 100 is discharged to a predetermined voltage from the current voltage. The current state information of the battery thus obtained is at least one of remaining capacity, usable time, and discharge current of the battery 100.

Here, in step S920, the remaining capacity or available time of the battery 100 is obtained by the following steps in detail.

First, the control means 300 calculates a predetermined capacity from the current voltage to a constant voltage by discharging the battery 100 according to the 10-hour rate discharge characteristic curve of the battery 100 from the current voltage to a predetermined constant voltage ( S921). The calculation is based on [Equation 1], where t ₀ is the time of the current voltage and t ₁ is the time when the constant voltage is reached.

Next, the control means 300 calculates the usable capacity of the battery 100 by obtaining the time of arrival from the current voltage to the predetermined minimum voltage according to the discharge characteristic curve (S923). In this case, the minimum voltage is the lowest voltage of the battery 100 to operate at least one of the rectifier, the induction lamp, and the emergency lamp.

Here, the usable capacity of the battery 100 is based on [Equation 1] described above, where t ₀ is the time of the current voltage and t ₁ is the time when the minimum voltage is reached. On the other hand, by differentiating the usable capacity of the battery 100 by the discharge current, it is also possible to calculate the usable time of the battery 100, as shown in Equation 2 below.

(T: available time, Q: battery capacity, i: discharge current)

Next, the control means 300 calculates the current capacity of the battery 100 by obtaining the time of arrival from the current voltage to a predetermined end voltage according to the discharge characteristic curve (S925). In this case, the final voltage is the lowest voltage of the battery 100 that can be recharged after discharging the battery 100 and becomes a voltage for calculating the rated capacity of the battery 100.

Here, the current capacity of the battery 100 is based on [Equation 1] described above, t ₀ is the time of the current voltage and t ₁ is the time when the end voltage is reached. On the other hand, dividing the current capacity of the battery 100 by the rated capacity and multiply by 100 to obtain the current percentage capacity of the battery 100.

Next, after performing the step S920, the control means 300 performs a step (S930) for charging the battery 100. In order to charge the battery 100, the control means 300 should be switched to the charging mode by outputting a control signal to the mode switching means 400.

In the discharge mode, when the control means 300 calculates the current capacity of the battery 100 by discharging the battery 100 to a predetermined voltage, the control means 300 switches to the charging mode again to charge the battery 100 to the maximum charging voltage. By charging / discharging the battery 100 at regular intervals, the life of the battery 100 can be extended, and the current capacity and the available time of the battery 100 can be predicted.

Finally, after performing step S930, the display means 500 displays in real time at least one of whether the battery 100 has failed, the available time of the battery 100, and the remaining capacity of the battery 100. To perform.

Meanwhile, in addition to periodically charging / discharging the battery 100, the current state of the battery 100 may be evaluated using discharge current which is current state information of the battery 100. At this time, the current state of the battery 100 is a failure of the battery 100, the determination of the failure of the battery 100 is determined by measuring the change amount of the discharge current. In other words, when the battery 100 is inoperable, the discharge current is zero or the flow value of the fluctuation is severely drawn during discharge. Therefore, it is determined whether or not the battery 100 is broken by measuring the change amount of the discharge current.

As mentioned above, although demonstrated with reference to one Embodiment of this invention, this invention is not limited to this, A various deformation | transformation and an application are possible. In other words, those skilled in the art can easily understand that many variations are possible without departing from the gist of the present invention.

100: Battery
200: battery monitoring means
300 control means
400: mode switching means
410,420: Relay switch
411,421: relay drive unit
500: display means
600: power supply means
700: AC power supply means
800: load

Claims (12)

The control means 300 measuring an open voltage of the battery 100 (S910);
Acquiring current state information of the battery (100) by discharging the battery (100) by the control means (S920); And
The control means 300 charging the battery 100 (S930); and
The control means (300) is a battery evaluation method having a charge and discharge function, characterized in that for evaluating the current state of the battery (100) based on the current state information.
The method of claim 1,
The step S910,
Outputting a control signal to the mode switching means 400 by the control means 300 (S911);
Acquiring (S913) the mode switching means (400) by separating the battery (100) from the power source (600) and the load (800) according to the control signal; And
And calculating, by the control means (300), an initial remaining capacity of the battery (100) using the open voltage (S915).
The method of claim 1,
The current state information,
Battery evaluation method having a charge and discharge function, characterized in that at least one of the remaining capacity, available time, and discharge current of the battery (100).
The method of claim 3, wherein
The current state of the battery 100 is whether or not the battery 100 is broken,
The battery evaluation method having a charge and discharge function, characterized in that the determination of the failure of the battery 100 by determining the amount of change of the discharge current.
The method of claim 1,
The step S920,
Acquiring the current state information by measuring at least one of a discharge current, a discharge capacity, a discharge time, and a voltage change amount of the battery 100 by discharging the battery 100 from a current voltage to a predetermined voltage. Battery evaluation method having a charge and discharge function characterized in.
The method of claim 1,
The step S920,
Calculating the predetermined capacity from the current voltage to the predetermined voltage by discharging the battery 100 according to the discharge characteristic curve of the battery 100 from the current voltage to a predetermined constant voltage ( S921);
Calculating, by the control means (300), the usable capacity of the battery (100) by obtaining a time of arrival from the current voltage to a predetermined minimum voltage according to the discharge characteristic curve (S923); And
And calculating, by the control means 300, a current capacity of the battery 100 by obtaining a time of arrival from the current voltage to a predetermined end voltage according to the discharge characteristic curve (S925). Battery evaluation method having a charge and discharge function.
The method according to claim 6,
The discharge characteristic curve is a battery evaluation method having a charge and discharge function, characterized in that according to the rate of 10 hours.
The method according to claim 6,
The minimum voltage is,
Battery evaluation method having a charge and discharge function, characterized in that the lowest voltage of the battery (100) to operate at least one of the rectifier, induction lamp, and emergency light.
The method according to claim 6,
The step S923,
Battery charging method with a charge and discharge function, characterized in that for calculating the available time of the battery (100) by differentiating the usable capacity by the discharge current.
The method according to claim 6,
The final voltage is,
Battery evaluation method having a charge and discharge function, characterized in that the lowest voltage of the battery 100 that can be recharged after discharging the battery (100).
The method according to claim 6,
The constant capacity, usable capacity, and the current capacity is a battery evaluation method having a charge and discharge function, characterized in that calculated based on the following [Equation].
[Mathematical Expression]

Where Q is the capacitance of the capacitor, i is the discharge current, and t is the time.
The method of claim 1,
And displaying, by the display means 500, at least one of whether the battery 100 is broken, the available time of the battery 100, and the remaining capacity of the battery 100. Battery evaluation method having a charge and discharge function.

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