KR101947490B1 - SOC(State of Charge) Algorithm on the battery and measure method - Google Patents

Abstract

The present invention relates to a method of displaying a state of charge (SOC) of a battery and measuring remaining battery power which can check accurate remaining battery power. The method of displaying a state of charge of a battery and measuring remaining battery power comprises: a first process of setting designated voltage range, insulation resistance, internal cell resistance, and driving temperature range in a battery pack, and driving an SOC algorithm of a battery; a second process of measuring a voltage of the battery pack to check whether the battery is driven within the set voltage range; a third process of measuring insulation resistance of both polarities of the battery when the voltage range is not abnormal after the second process is performed; a fourth process of measuring internal resistance of the battery if the insulation resistance is normal to determine whether the battery is old; a fifth process of measuring a temperature of the battery if the internal resistance of the battery is lower than or equal to a set value; and a sixth process of checking whether a current flows through the battery if the temperature of the battery is within a normal range in the fifth process or the battery can be driven by heat management to measure a current value flowing through the battery if a current flows through the battery and integrate the current over time in real time as shown in the following mathematical equation to measure the SOC of the battery.

Description

[0001] The present invention relates to a method for measuring the remaining capacity of a battery,

The present invention relates to a method for measuring the remaining state of a battery, and more particularly, to a method for measuring the remaining state of a battery by applying a battery display algorithm when driving an existing battery, The present invention relates to a method for measuring the remaining battery state of a battery capable of accurately checking the battery remaining amount by applying a SOC table of a used battery pack to a failure state in real time by displaying advance warning when a problem occurs.

2. Description of the Related Art Generally, a battery is used in a robot system and an electric driving apparatus when an electric vehicle is driven. The remaining amount of the battery is a very important factor in controlling the electric driving apparatus. When a problem occurs in the battery, the electric drive stops. These problems are caused by a large problem in electric carts, electric trains and electric vehicles. If there is a problem caused by a specific cause of the battery pack while driving on the road and it stops because the output does not come out, it is impossible to move along with the sudden stop, so there is a great risk of accidents and difficulty in handling the problem. In order to prevent this, when the remaining amount of the battery and a serious problem occur, the user informs the situation before the occurrence of the situation, recognizes the situation in terms of the control system, gives time to move to a safe place, To prevent accidents that may occur.

One battery pack is used for the electric drive unit. These battery packs indicate the current usable capacity based on the current voltage. If a problem occurs without a separate fault situation warning, the battery pack will suddenly stop the electric drive. If such phenomena occur in electric vehicles, it can lead to human accidents.

In addition, the conventional method of displaying the battery state of charge (SOC) is indicated by the voltage level, and the SOC is displayed as shown in [Table 1].

Battery SOC indication Battery voltage Number of lights LED Display One 24.05V or more 10 lights Red 3 + Yellow 4 + Green 3 2 23.9 ± 0.15 V 9 lights Red 3 + Yellow 4 + Green 3 3 23.6 ± 0.15 V 8 lights  Red 3 + Yellow 4 + Green 3 4 23.3 ± 0.15 V 7 lights Red 3 + Yellow 4 5 23.0 ± 0.15 V 6 lights Red 3 + Yellow 3 6 22.7 ± 0.15 V 5 lights Red 3 + Yellow 2 7 22.4 ± 0.15 V 4 lights Red 3 + Yellow 1 8 22.1 ± 0.15 V 3 lights Red 3 9 21.8 ± 0.15 V 2 lights Red 2 10 21.75 or less One lit Red 1

If the SOC is displayed according to the voltage level, the voltage is not constantly output as shown in FIG.

Therefore, in terms of the life span of the battery pack, it is important to use the correct capacity and take temperature and other environmental conditions into consideration, and the battery pack is determined by the service life and the service life, and accordingly, the capacity and temperature of the battery.

Accordingly, the present invention proposes a method of measuring the battery status and remaining amount through an algorithm in a battery pack.

1. DECISION APPARATUS OF THE SOC OF BATTERY AND DECISIONMETHOD THEREOF (Patent Registration No. 10-077844) 2. SYSTEM AND METHOD FOR ADJUSTING THE BATTERY SOC (Patent Registration No. 10-1749383) 3. Battery management system and method for adjusting SOC value of the system (Patent Application No. 10-2012-0032241)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a battery indication algorithm, The present invention provides a method of measuring the remaining battery state of a battery capable of accurately checking the battery remaining amount by applying a SOC table of the used battery pack to a faulty state in real time by displaying a warning before a problem occurs.

In order to solve the problem that a motor, a sensor, and an actuator, which are electric driving devices, do not operate when a trouble occurs in a robot system and an electric vehicle and an output is not outputted, The present invention provides a method for displaying the remaining state of the battery, which can provide an environment for accurately displaying the residual amount of the battery through the knowing method and informing the user of the type of the problem in case of a problem with the battery, have.

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According to another aspect of the present invention, there is provided a method of measuring the remaining battery state of a battery, the method comprising: setting a voltage range, an insulation resistance, a cell internal resistance, and a driving temperature range of the battery pack; A first process; A second step of measuring a voltage of the battery pack to confirm whether the battery is driven within a set voltage range; A third step of measuring an insulation resistance of the battery anode when the voltage range is not abnormal after the second process is performed; A fourth step of determining whether the battery is aged by measuring an internal resistance of the battery if the insulation resistance is normal; A fifth step of measuring a temperature of the battery when the internal resistance of the battery is less than a set value; In the fifth step, if the temperature of the battery is within the normal range, or if it is possible to drive through the thermal management, it is checked whether the battery is conducting current, and if the current flows through the battery, the current flowing through the battery is measured, And a sixth step of integrating the current according to time with respect to time to measure the battery SOC.

The present invention provides a method for measuring the remaining state of a battery, which includes applying a battery display algorithm to a battery to display a state of the battery cell, a temperature of the battery, information on the battery state of the battery, And provides an effect to check the remaining battery level by applying the SOC table of the used battery pack.

The present invention also provides a method for measuring remaining battery status of a battery, which accurately estimates a current status of a battery, thereby detecting a secondary accident that may occur due to a shortage of remaining battery power, It is possible to provide an environment for operating a safer electric drive apparatus by securing a time for evacuation to a safe zone by warning.

A method of measuring the remaining state of a battery according to the present invention is a method of measuring the remaining state of a battery by using a motor, a sensor, and an actuator as an electric driving device when a trouble occurs in a battery system and an electric vehicle, In order to solve the non-operation problem, the remaining charge amount of the battery can be accurately displayed, so that the charge state and remaining charge amount of the battery can be grasped so that the trouble caused by the battery and the information can be known.

The present invention also provides a method for measuring the remaining state of a battery according to the present invention, which can accurately grasp a charged state and a remaining state of a battery in a system in which electric power is used, such as an autonomous robot or an electric vehicle, In consideration of the influence of the temperature and the output characteristics, the total amount of the usable energy can be changed, so that the capacity of the usable battery is displayed at the time, So that the safety time can be secured.

1 shows a conventional battery status display graph
2 is a block diagram for driving a battery status display algorithm according to the present invention.
3 is a block diagram showing an internal configuration of the SOC board according to FIG.
4 is a flowchart illustrating a battery remaining amount measurement method using a battery status display algorithm according to the present invention.
5 to 6 show a battery SOC Lookup Table
FIG. 7 is a graph showing battery SOC and actual SOC comparison graph according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be given with reference to the accompanying drawings. In the following description of the present invention, 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.

FIG. 2 is an internal cross-sectional view of a battery status display algorithm and a residual amount measuring method according to the present invention. FIG. 2 is a block diagram illustrating an external peripheral device and its configuration. The battery peripheral 10, the SOC board 20, And an external device 30. Looking at its operation,

The battery unit 10 is operatively coupled to an external device to convert the charging power generated from the power generation module rotor into a power output by driving a charging device such as a vehicle and a driving motor to an electrical output to supply power, Store the required power in the battery pack.

The SOC board 20 measures the voltage, current, temperature, and resistance of the battery to provide power to the battery unit 10, calculates the battery status, calculates a required output value, and compares the remaining battery level for output Thereby controlling the switching operation for charging.

The external device 30 is interlocked with the SOC board 30 to drive a cooling fan for cooling the battery unit 10 according to a set temperature range through battery operation of the SOC or to drive a heater for heating, So that the unit 10 can be efficiently managed and maintained.

3 is a block diagram showing an internal configuration of the SOC board 20 according to the present invention. The detailed configuration of the SOC board 20 includes a control unit 21, a sensor unit 22, an operation unit 23, a switch unit 24, A measurement unit 25 and an output unit 27. [ 2 and 3, the control unit 21 controls the voltage and current of the battery to provide power to the battery unit 10, Temperature and resistance values of the SOC board 20, calculates the required output value by calculating the battery state value, compares the remaining battery value for output, and controls the overall operation of the SOC board 20 so that the switching operation for charging is performed.

The sensor unit 22 responds to the control signal of the control unit 21 and senses a state for measuring the voltage, current, temperature, and resistance of the battery in cooperation with the battery unit 10, The operation unit 23 reads the voltage, current, temperature and resistance value of the battery sensed by the sensor unit 22 according to the control signal of the control unit 21 to the voltage of the basic battery unit, the insulation resistance, And calculates the state information of the internal temperature.

The switch unit 24 is responsive to the control signal of the control unit 21 to perform a crossing operation for sending out or shorting an actual output value considering the voltage of the battery unit, the insulation resistance, the internal resistance, Lt; / RTI >

The measurement unit 25 measures an output current value that is output from the battery unit to be a crossing operation for power supply or short circuit considering the actual output value for driving the battery unit 24 of the switch unit 24. [

The output unit 26 outputs a control signal for overcharging, over-discharging, over-discharging, over-discharging, and over-discharging of the battery unit according to the charging / discharging characteristics and state of the corresponding battery unit according to the output current value measured by the measuring unit 25, Overvoltage, and overheat.

FIG. 4 is a flowchart illustrating a battery remaining amount measurement method using a battery status display algorithm according to the present invention. Referring to FIGS. 2 to 4, a battery remaining amount measurement method for an SOC algorithm according to the present invention will be described first. The sensor unit 22 measures the voltage range, the insulation resistance, the internal resistance of the cell, the current, and the driving temperature of the initial battery unit 10 according to the state of the battery pack. That is, according to the battery pack, the voltage range, the insulation resistance, the internal resistance of the cell, and the driving temperature range are set, and the battery SOC algorithm is driven.

The battery voltage is measured according to the sensing of the sensor unit 22 to check whether the battery is driven within a predetermined voltage range. If the battery voltage is out of the range, the controller 21 determines that the battery is in a fault condition.

Thereafter, if the value is higher than the set range, state information according to the overvoltage fault is displayed through the output unit 27, and if the value is lower than the set range, the low voltage fault is displayed through the output unit 27.

When the voltage range is not abnormal, the insulation resistance of the battery anode is measured through the measuring unit 25. If this value is not larger than the initial insulation resistance value, it is calculated that there is a problem in battery driving, And stops the battery operation.

On the other hand, there is no problem with the insulation resistance, and next step is to measure the internal resistance of the battery, and the internal resistance of the battery can judge whether or not the battery is aged.

That is, when the internal resistance of the battery is larger than the initial set value, the battery is indicated as a battery aging fault state so that the user can be recognized. The internal resistance of the battery is less than the set value and the temperature of the battery is measured in the next step.

If it is determined that the battery temperature is outside the initially set battery temperature range according to the battery temperature measurement, it is determined that battery operation is not smooth, and the procedure proceeds to the temperature management procedure.

On the other hand, when the temperature of the battery is higher than the initially set range, the cooling fan inside the battery is driven through the external device, the internal battery heat management is started, and the battery over temperature warning is notified to the user.

When the temperature of the battery is lower than the initial set range, the battery is heated by driving a heater within the battery and notifies the user of the battery low temperature warning.

However, if the value outside the temperature range is higher than a predetermined value, it is determined that there is a problem in driving the thermal management system in parallel, so that the user is informed of the fault and stops the battery operation.

If the temperature of the battery is within the normal range, or if it can be driven through thermal management, the battery SOC is measured.

In order to measure the accurate SOC of the battery, the battery is checked for current conduction. When current is flowing through the battery, the current flowing through the battery is measured.

At this time, the battery SOC can be known by integrating the current according to time with respect to time.

That is, the SOC of the battery is calculated by integrating the current according to time with respect to time as shown in the following Equation (1).

[Equation 1]

From here

SOC: final state, i: current flowing in the battery

On the other hand, when no current flows in the battery, the current temperature and voltage of the battery are measured to determine the SOC. As a condition for determining the SOC through the temperature and voltage of the battery, the battery SOC is determined based on the battery SOC lookup table as shown in FIGS. 5 to 6, and the battery SOC at the corresponding voltage and temperature value is displayed.

In addition, the SOC amount calculated by the calculated lookup table for each temperature is displayed, and the SOC amount that is changed by charging (+) or discharging (-) by integrating the current is finally displayed .

By repeating the above process, the state of the battery can be known in real time, and when the electric current flows or does not flow, the accurate SOC value can be known, so that the efficient electric driving device can be operated.

The SOC battery value measured by the above procedure is represented by the SOC calculated according to the battery display algorithm and the actual SOC of the actual battery as shown in FIG. 0 or 100%, so that the slope is changed.

The reason why the separate SOC is needed is that the calculated SOC according to the battery display algorithm is used through a separate calculation due to the chemical characteristics of the battery cell and the safety problem.

First of all, the lithium ion battery is chemically characterized in that the life of the battery is shortened when the battery is repeatedly used after the full charge fully discharged. This limits the range of charge and discharge in the controller, thus further extending the life of the battery.

In addition, the safety problem is that when the SOC of the equipment becomes 0%, it is difficult to secure the time to evacuate to the safety zone since the electric driving device can not be operated. Even in such an emergency situation, a small amount of battery remains in the battery, so that the electric drive can be operated in a low power state to avoid an accident in a safe situation.

As described above, preferred embodiments of the present invention have been disclosed in the present specification and drawings, and although specific terms have been used, they have been used only in a general sense to easily describe the technical contents of the present invention and to facilitate understanding of the invention , And are not intended to limit the scope of the present invention. It is to be understood by those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10: Battery section
20: SOC board
21: control unit 22:
23: operation unit 24:
25: measuring section 26: output section
30: External device

Claims (9)

delete A battery that is interlocked with the external device by power supply to convert the charging power generated from the power generation module into electric output by driving the charging device of the vehicle and the driving motor to supply power, Current, temperature, and resistance value of the battery to provide power to the battery unit 10 and the battery unit 10, calculates a battery state, calculates a necessary output value, compares the remaining battery value for output, And a SOC board (20) for performing a switching operation for the battery,
A first step of setting a voltage range, an insulation resistance, a cell internal resistance, and a drive temperature range set in the battery pack and driving the SOC algorithm of the battery;
If the battery is out of the set voltage range, the battery pack is determined to be in a fault condition. If the battery pack is higher than the set range, the battery pack state information is displayed according to the overvoltage fault. If the battery pack is lower than the set range, A second step of checking whether the set voltage range is driven;
If the measured insulation resistance is not greater than the initially set insulation resistance value after the second process has been performed and the voltage resistance of the battery anode is measured when there is no abnormality in the voltage range, A third step of displaying an error and interrupting battery operation;
Measuring the internal resistance of the battery if the insulation resistance is normal, and determining whether the battery is aged so that the internal resistance of the battery is greater than an initial set value;
If the internal resistance of the battery is less than the preset value, the battery temperature is measured. If the internal resistance of the battery is outside the initial set battery temperature range according to the battery temperature measurement, it is determined that the battery is not smoothly operated. If the temperature is higher than the initial set range, it will drive the cooling fan inside the battery, manage the internal heat of the battery, display the battery over temperature warning, or if the temperature of the battery is lower than the initial set range, A fifth step of performing heating and displaying a battery low temperature warning; And
In the fifth step, if the temperature of the battery is within the normal range, or if it is possible to drive through the thermal management, it is checked whether the battery is conducting current, and if the current flows through the battery, the current flowing through the battery is measured, A sixth step of integrating the current according to time with respect to time to measure the battery SOC;
[Equation 1]

The remaining capacity of the battery is measured.
delete delete delete delete delete delete 3. The method of claim 2,
In the sixth step,
If no current flows in the battery, the current temperature and voltage of the battery are measured to determine the SOC. The condition for determining the SOC is determined by the battery SOC Lookup Table, and the battery SOC at the corresponding voltage and temperature is displayed. (SOC) amount by accumulating the current (+) or discharging (-) at the time of charging.

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