KR20170006400A - Device for checking of battery SOC on vehicle and method thereof - Google Patents

Abstract

The present invention relates to an apparatus and method for estimating the state of charge (SOC) of a battery. The apparatus for estimating the SOC of a battery according to an exemplary embodiment of the present invention includes a measurement part for measuring the voltage and current of the battery of the vehicle, a calculating part for calculating the current capacity of the battery by using a predetermined open circuit voltage (OCV) of the battery and a voltage value and a current value measured by the measurement part, a memory for storing an OCV table in which an OCV value and a state of charge (SOC) value corresponding to the OCV value are tabulated, and an estimation part for estimating the SOC value of the battery by using the OCV table or estimating the SOC value using the current capacity of the battery. So, the SOC of the battery can be accurately estimated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for estimating a state of charge (SOC)

The present invention relates to an apparatus and method for estimating a state of charge of a battery for a vehicle, and more particularly, to an apparatus and method for estimating a state of charge of a battery of a high voltage battery for environmental vehicles.

Recently, the eco-car market such as Hybrid Electric Vehicle (HEV) and Fuel Cell Electric Vehicle (FCEV) is growing rapidly.

At present, hybrid type environmental cars that use fuel and battery as a power source due to limitations in performance and efficiency of environment-borne batteries such as charging time, charging facility infrastructure, and distance after full charge can be marketable compared to pure electric cars. to be.

However, as the environment car battery and research and development to improve the performance and efficiency of the vehicle design are continuously made, the center of the market is expected to move toward pure electric cars powered by batteries only in the future.

According to this prospect, there is a demand for a technology for estimating the precise state of charge of a vehicle battery in order to improve user convenience and merchandise.

A conventional technique for estimating the state of charge (SOC) of a vehicle is as follows.

The BMS (Battery Management System) that manages the battery of the environment vehicle receives the measured voltage value and current value from the voltage sensor and the current sensor at the battery output terminal. This value is the voltage value and current value of the load side, and the internal resistance value is calculated from the relationship between voltage and current (voltage / current = internal resistance).

)을 계산하여 손실 출력을 구할 수 있다. 또한, 배터리 출력단의 전압센서와 전류센서로부터 측정된 전압 값과 전류 값의 곱을 부하측 출력(부하측 출력 = 전압 * 전류)이라 한다.Joule heat loss due to calculated internal resistance (

) Can be calculated to obtain the loss output. The product of the voltage value and the current value measured from the voltage sensor at the battery output terminal and the current sensor is called the load side output (load side output = voltage * current).

The battery output is the sum of the load side output and the loss output (battery output = loss output + load side output) obtained in the above procedure. By integrating the battery output with respect to time, the amount of battery energy actually being output from the battery (battery energy amount = battery output * time) can be obtained.

Since the battery energy amount is the product of the average capacity of the battery and the average voltage to the discharge end voltage (battery energy amount = the battery rated capacity * the average voltage to the discharge end voltage), the amount of battery energy actually output The current capacity of the battery (battery current capacity = battery energy / voltage) can be calculated.

Finally, the SOC value is estimated by dividing the calculated capacity of the battery by the design capacity. At this time, since the SOC value represents the current capacity of the design capacity of the battery, it can have a specific numerical value of 0 or more and 1 or less.

On the other hand, since the magnitude of the internal resistance value is proportional to the temperature, when the temperature of the internal resistance rises, the internal resistance value becomes large. Since the current value is inversely proportional to the magnitude of the internal resistance value, if the internal resistance value becomes unreasonably large, the current value approaches zero or zero, and an error of the battery output value as described above appears.

The error of the battery output value leads to an accumulation error of the battery energy amount. As a result, if the SOC value is estimated through the conventional output accumulation method, there is a problem that an incorrect SOC value is derived.

The present invention relates to a method of estimating a state of charge (SOC) of a battery using an OCV (Open Circuit Voltage) table that is hardly influenced by a temperature and a method of estimating a state of charge of a battery using an output integration method, And a method for estimating the state of charge of the battery.

According to an aspect of the present invention, there is provided an apparatus for estimating a state of charge (SOC) of a battery, including a measurement unit for measuring a voltage and a current of a battery of a vehicle, a voltage value measured by the measurement unit, An operation unit for calculating a current capacity of the battery using an initial measured voltage (Open Circuit Voltage) value of the battery, an OCV value indicating a state of charge (SOC) value corresponding to the OCV value, A memory for storing a table, and an estimator for estimating an SOC value of the battery using the OCV table or an SOC value using a current capacity of the battery.

The measuring unit determines whether the voltage value and the current value are measured for the first time, and sets the voltage value to the OCV value when it is determined that the measured value is the first measured value.

Wherein the calculation unit calculates an internal resistance value of the battery using the voltage value, the current value, and the OCV value as a result of the determination by the measurement unit, and if the internal resistance value is less than a predetermined threshold resistance value .

Wherein the calculation unit transmits the OCV value to the estimation unit when the internal resistance value is determined to be equal to or greater than the threshold resistance value or the current value is determined to be 0, The current capacity of the battery is calculated using the internal resistance value if the current value is smaller than a predetermined threshold resistance value and the current value is greater than zero.

The calculation unit calculates the loss output value and the load side output value of the battery using the internal resistance value, the voltage value, and the current value, and calculates the battery energy amount using the calculated loss output value and the load side output value And calculates the current capacity of the battery using the calculated amount of battery energy.

The estimating unit estimates the SOC value of the battery by acquiring the SOC value corresponding to the OCV value from the OCV table or the SOC value of the battery by dividing the current capacity of the battery by the predetermined capacity of the battery .

The estimator updates the OCV table using the estimated SOC value based on the current capacity of the battery.

According to another aspect of the present invention, there is provided a method for estimating a state of charge (SOC) of a battery, comprising the steps of measuring a voltage and a current of a battery of a vehicle, measuring a measured voltage value, Calculating an OCV value of the battery based on the OCV value of the battery, and calculating an SOC value of the battery using an OCV table in which a value of a state of charge (SOC) corresponding to the OCV value is tabulated, Estimating an SOC value of the battery using the current capacity of the battery.

The calculating step may include determining whether the voltage value and the current value are initially measured, and setting the voltage value to the OCV value when it is determined that the voltage value is the first measured value.

Calculating the internal resistance value of the battery using the voltage value, the current value, and the OCV value when the determination is not the first measurement as a result of the determination, And comparing the magnitude of the resistance value.

The calculating step calculates the current capacity of the battery using the internal resistance value if the internal resistance value is smaller than the preset threshold resistance value and the current value is greater than zero.

Calculating the loss output value and the load side output value of the battery using the internal resistance value, the voltage value, and the current value, calculating the battery output value using the calculated loss output value and the load side output value, Calculating an amount of energy, and calculating a current capacity of the battery using the calculated amount of battery energy.

The estimating step may estimate the SOC value of the battery using the OCV value and the OCV table if the internal resistance value is determined to be equal to or greater than the threshold resistance value or the current value is determined to be 0 And estimating an SOC value of the battery by dividing a current capacity of the battery by a predetermined design capacity of the battery.

The method further includes updating the OCV table using the SOC value of the battery estimated through the current capacity of the battery.

According to the embodiment of the present invention, the SOC value (SOC) using the open circuit voltage (OCV) table of the battery which is hardly influenced by the temperature characteristic in estimating the state of charge (SOC) By using the estimation method and the SOC value estimation method using the output integration method, it is possible to estimate the SOC value of the battery with higher accuracy.

In addition, according to the embodiment of the present invention, by applying a feedback loop type feedback loop that updates the OCV table using the estimated SOC value of the battery, the accumulated error can be minimized, As a result, an accurate SOC value can be estimated.

1 is a block diagram of an apparatus for estimating the state of charge of a battery for a vehicle according to an embodiment of the present invention;
2 is a view for explaining the OCV and internal resistance of a battery according to an embodiment of the present invention;
3 is a flowchart illustrating a method for estimating a charged state of a battery for a vehicle according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. And is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined by the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that " comprises, " or "comprising," as used herein, means the presence or absence of one or more other components, steps, operations, and / Do not exclude the addition.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals refer to like elements throughout. In the drawings, like reference numerals are used to denote like elements, and in the description of the present invention, In the following description, a detailed description of the present invention will be omitted.

Prior to the description, a vehicle battery applicable in the present invention will be briefly described.

The vehicle battery is used as a power source in an electric vehicle (EV), which is a typical eco-car. Hybrid Electric Vehicle (HEV) and Plug-in Hybrid Electric Vehicle (PHEV), which use fossil fuel as a power source in addition to batteries, are also included in the electric vehicle category. Currently, Lithium Polymer batteries are widely used as electric batteries.

The battery can be a high voltage battery for supplying energy to the high output motor of the environment vehicle, and the voltage can be about 180V to 280V. At this time, the battery is a battery module assembly (BMA), and may be in the form of a battery pack in which a plurality of batteries are connected in series.

The charging method of the high voltage battery is rapid charging using a large capacity power source and a slow charging using a household power source. Rapid charging has a faster charging time than slow charging but may cause deterioration of the battery. Therefore, the life of the high-voltage battery can be guaranteed, and the constant charging with the convenience of being able to be charged with a general domestic power source of about 100 to 200 V is widely used.

As described above, when the battery is charged, a technique for estimating a more accurate state of charge (hereinafter referred to as SOC) is required for the convenience of the user and improvement of the merchantability.

Hereinafter, a battery charging state estimating apparatus for a vehicle according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2. FIG.

1 is a block diagram of an apparatus for estimating the state of charge of a battery for a vehicle according to an embodiment of the present invention. 2 is a reference view for explaining the OCV and internal resistance of a battery according to an embodiment of the present invention.

1, an apparatus 200 for estimating charged state of a vehicle according to an exemplary embodiment of the present invention includes a measurement unit 210, an operation unit 220, an estimation unit 230, and a memory 240 can do. Here, the battery state estimation apparatus 200 may be a battery management system (BMS) that generally manages the battery of the environment vehicle.

The measuring unit 210 may include a voltage sensor 211 and a current sensor 212 connected to an output terminal of the battery 100 and measuring voltage and current. A voltage sensor (211) is connected to the output of the battery (100) to periodically monitor the voltage within the battery system. Here, the voltage in the battery system is a load voltage, which means a voltage applied to the load when an actual current is applied to the battery 100 and the system (battery system) connected to the battery as shown in Fig. In addition, the current sensor 212 periodically monitors the current in the battery system.

The measurement unit 210 measures the voltage and current of the battery system through the voltage sensor 211 and the current sensor 212 and determines whether the measured value (voltage value, current value) is the initial measurement value. For example, the measuring unit 210 may determine a voltage value and a current value measured within a predetermined time (e.g., one second) after the battery system is started or restarted as an initial measurement value.

As a result of the determination by the measurement unit 210, when the measured voltage value and the current value are the initial measured values, the system connected to the battery 100 and the battery may be regarded as a no-load state. At this time, the voltage value (initial measured voltage value) measured by the voltage sensor 211 may be referred to as an OCV (Open Circuit Voltage) value of the battery 100. Here, the OCV value is a voltage value when the current is not applied to the battery 100, and is an intrinsic voltage value of the battery 100.

The OCV value of the battery 100 may be stored in the memory 240. The memory 240 may be a random access memory (RAM) or a programmable read only memory (PROM), which can be embedded in a predetermined location in the battery state estimation apparatus 200, Memory), and the like.

The initial measured voltage (OCV) value measured by the measuring unit 210 is transmitted to the estimator 230 and used to estimate the initial SOC value of the battery 100. [ This will be described in detail later when the estimation unit 230 is described.

If the measured voltage value and the measured current value are not the initial measured values, the voltage value and the current value are transmitted to the operation unit 220. [ At this time, the OCV value of the battery 100 is also transmitted. Here, the OCV value may be transferred from the memory 240 to the operation unit 220.

The calculating unit 220 calculates the internal resistance value using the voltage value, the current value, and the OCV value received from the measuring unit 210. At this time, the internal resistance value can be obtained from the relationship between the voltage and the current, and refers to a loss value exiting to the outside through a lead wire or the like.

The internal resistance value can be calculated according to Equation 1 or Equation 2 according to charge and discharge.

The magnitude of the internal resistance value is proportional to the temperature. Therefore, when the temperature of the internal resistance of the battery system rises, the internal resistance value becomes large. In addition, since the current value of the battery system is inversely proportional to the magnitude of the internal resistance value, the current value approaches 0 or 0 when the internal resistance value becomes non-idealized by the temperature.

As described above, when the internal resistance value is abnormally large or the current value approaches zero, an error may occur in the process of integrating the battery output value for obtaining the SOC value using the internal resistance value and the current value.

Therefore, in the present invention, in order to detect that the internal resistance value becomes abnormally large, a threshold resistance value may be set in advance. At this time, the threshold resistance value may be set as a result of a test conducted in advance in the system connected to the battery 100 and the battery. The predetermined threshold resistance value through the above process can be stored in the memory 240 or in a separate storage means.

The operation unit 220 compares the internal resistance value calculated in the above-described processes (Equations 1 and 2) with the predetermined threshold resistance value, and determines whether the magnitude of the current value is zero.

If the internal resistance value is equal to or greater than the threshold resistance value or the current value is 0 as a result of comparing the internal resistance value and the threshold resistance value, the operation unit 220 determines that the battery system is in a no-load state.

For example, it is assumed that a voltage value measured by the measuring unit 210 is 273 V, a current value is 0.1 A, an OCV value is 270 V, and a threshold resistance value is set in advance.

(R = (273-270) /0.1=30), the internal resistance value is calculated as 30 OMEGA. Since the calculated internal resistance value is 30?, Which is greater than the critical resistance value 10 ?, in this case, the operation unit 220 determines that the battery system is in a no-load state.

When the battery system is determined to be in a no-load state, that is, when the internal resistance value is equal to or greater than the threshold resistance calculation value, or when the current value is 0, the operation unit 220 calculates the OCV value used for calculating the internal resistance value (230). The OCV value transmitted to the estimating unit 230 is used to estimate the SOC value of the battery 100. This will be described in more detail later when the estimation unit 230 is described.

Meanwhile, when the internal resistance value is smaller than the critical resistance value and the current value is larger than 0 as a result of comparing the internal resistance value and the threshold resistance value, the operation unit 220 determines that the internal resistance is in a normal state.

For example, it is assumed that a voltage value measured by the measuring unit 210 is 265 V, a current value is 0.2 A, an OCV value is 270 V, and a threshold resistance value is set to 30 OMEGA.

(R = (270-265) /0.2=25), the internal resistance value is calculated as 25Ω. The calculated internal resistance value is less than the threshold resistance value of 30 OMEGA, so that the operation unit 220 determines the size of the internal resistance of the battery system as a normal state.

When the internal resistance value is determined to be a normal state, that is, when the internal resistance value is smaller than the threshold resistance value and the current value is larger than 0, the operation unit 220 calculates the amount of energy of the battery 100 according to the output integration method , And converts the energy amount into the present capacity (computes). The process is as follows.

First, the operation unit 220 can calculate the loss output value by calculating Joule heat loss by the internal resistance as shown in Equation (3).

The calculating unit 220 calculates a load side output value by multiplying a voltage value and a current value received from the measuring unit 210, as shown in Equation (4).

The sum of the loss output value and the load side output value obtained through Equations (3) and (4) is an output value of the battery 100 as shown in Equation (5).

The operation unit 220 integrates the calculated battery output value with respect to time to calculate the amount of battery energy actually being output from the battery 100. [ At this time, a calculation formula for obtaining the battery energy amount may be as shown in Equation (6).

Since the amount of battery energy obtained in Equation (6) is a product of the average voltage to the discharge end voltage and the rated capacity of the battery 100, the calculation unit 220 substitutes the amount of battery energy into Equation (7) Can be calculated.

The operation unit 220 transmits the current capacity of the battery 100 calculated through the above process to the estimation unit 230. The current capacity of the battery 100 delivered in this way is used by the estimation unit 230 to estimate the SOC value.

The estimator 230 can estimate the SOC value of the battery 100 using the OCV value or estimate the SOC value using the current capacity of the battery 100. [

When the OCV value is received from the measuring unit 210 or the calculating unit 220, the estimating unit 230 estimates the SOC using the OCV value of the battery 100 and the OCV table. Here, the OCV table may mean a table type (one table) in which SOC values of the battery 100 are matched one-by-one corresponding to a voltage value (OCV value).

The estimator 230 estimates the SOC value of the battery 100 in such a manner that the SOC value corresponding to the OCV value received from the OCV table previously stored in the memory 240 is obtained.

If the current capacity of the battery 100 is received from the calculator 220, the estimator 230 calculates the current capacity of the battery 100 according to the design capacity of the battery 100, And estimates the SOC value of the battery 100. Here, the design capacity may be predetermined by the full charge capacity at the time of shipment of the battery.

In this way, the estimation unit 230 can estimate the SOC value using the result of the output integration method of the calculation unit 220 (the current capacity of the battery 100). The estimated SOC value through the above process represents the current capacity of the battery design capacity, and thus can have a numerical value of 0 or more and 1 or less.

On the other hand, the estimated SOC value using the result of the output accumulation method (current capacity of the battery 100) can be used to update the OCV table stored in the memory 240. [ For example, the estimated SOC value using the current capacity of the battery 100 is sent to the memory 240 and stored in the position of the SOC data corresponding to the OCV value used in the output accumulation method, whereby the OCV table can be updated.

Accordingly, the memory 240 may include a random access memory (RAM) or a programmable read-only memory (PROM), which is capable of recording data several times in order to update the OCV table. In addition, the memory 240 may be configured as a non-volatile memory to hold data even when power is not supplied.

As described above, the present invention provides an SOC value estimation method using an Open Circuit Voltage (OCV) table of a battery which is hardly influenced by temperature characteristics in estimating the state of charge (SOC) of the battery And the SOC value estimation method using the output integration method, it is possible to estimate the SOC value of the battery with higher accuracy.

In addition, the present invention minimizes accumulated errors by applying a feedback loop type feedback loop that updates the OCV table using the estimated SOC value of the battery, and as a result, Value can be estimated.

3 is a flowchart illustrating a battery charging state estimation method according to another embodiment of the present invention.

The operations described below are considered to be performed by the device 200 for estimating battery charge state (SOC) unless otherwise noted.

First, the battery charging state estimation apparatus 200 measures voltage and current of a system connected to the battery 100 of the vehicle and the battery through a sensor (S301). Here, the sensor may be a voltage sensor and a current sensor connected to the output terminal of the battery 100 to periodically measure voltage and current in the system.

When the voltage value and the current value are measured, it is determined whether the measured voltage value and the current value are the first measured values (S302). For example, the battery charge state estimation device 200 can determine a voltage value and a current value measured within a predetermined time (for example, one second) after the system is started or restarted as an initial measurement value.

At this time, the measured voltage value (initial measured voltage value) can be referred to as OCV (Open Circuit Voltage) of the battery 100. Here, the OCV of the battery 100 is a voltage when no current is applied, and is an intrinsic voltage value of the battery 100. The OCV value of the battery 100 may be stored in a memory in the battery charge state estimation device 200. [

If it is determined in step S302 that the measured voltage value and the current value are the first measured values, the battery charging state estimation apparatus 200 determines the SOC of the battery 100 using the initial measured voltage (OCV) State of Charge, charge state) value (S303). The battery charge state estimation apparatus 200 estimates the SOC value of the battery 100 by searching the OCV table stored in advance based on the OCV value of the battery 100 and acquiring the SOC value corresponding to the retrieved OCV value. At this time, the OCV table may mean a table of a table type in which the SOC value of the battery 100 with respect to the voltage value is matched on a one-to-one basis.

On the other hand, if it is determined in step S302 that the measured voltage value and the current value are not the initial measured values, the battery charge state estimation device 200 determines the battery voltage and current value measured by the sensor, The internal resistance value can be calculated using the OCV value (S304). Herein, the internal resistance value refers to a loss value of the battery system, which passes through the lead wire, etc., and can be calculated as Equation (1) or Equation (2).

The battery charge state estimation apparatus 200 compares the internal resistance value calculated in step S304 with the predetermined threshold resistance value and determines whether the magnitude of the current value is 0 (S305). Here, the threshold resistance value can be set in advance to prevent the internal resistance value from becoming abnormally large. This threshold resistance value can be set as a result of a test or the like previously conducted in the battery system. Through this process, the predetermined threshold resistance value can be stored in a separate storage means (memory).

If the internal resistance value is equal to or greater than the threshold resistance value or the current value is 0 as a result of the determination in step S305, the battery charging state estimation apparatus 200 determines that the battery system is in a no-load state as in step S303, Can be used to estimate the SOC value. At this time, the battery charge state estimation apparatus 200 searches for the OCV value of the battery 100 in the pre-stored OCV table, and obtains the SOC value corresponding to the OCV value as a result of the search, Can be estimated.

On the other hand, if it is determined in step S305 that the internal resistance value is smaller than the threshold resistance value and the current value is greater than 0, the battery charge state estimation apparatus 200 calculates a battery output value (S306). When the internal resistance value is smaller than the critical resistance value and the current value is larger than 0, the battery charging state estimation apparatus 200 determines the size of the internal resistance as a normal state. If it is determined that the magnitude of the internal resistance is in a normal state, the loss output value due to the internal resistance is obtained as shown in Equation (3), and the load side output value can be obtained as a product of the measured voltage value and the current value as shown in Equation (4). At this time, the battery output value can be calculated by Equation (5) as the sum of the loss output value and the load side output value.

The battery charge state estimation apparatus 200 calculates the battery energy amount using the obtained battery output value (S307). The battery output value calculated in step S306 may be integrated with respect to time and calculated as the amount of battery energy actually being output from the battery 100. [ At this time, Equation (6) can be used as a method of calculating the amount of battery energy.

The battery charge state estimation apparatus 200 converts the calculated amount of battery energy into a current capacity of the battery (S308). Here, since the amount of battery energy is a product of an average voltage to the discharge end voltage and a rated capacity of the battery 100, the amount of battery energy is divided by the current value of the battery 100 Capacity.

The battery charge state estimation apparatus 200 estimates the SOC value of the battery 100 by dividing the current capacity of the battery 100 by the design capacity of the battery 100 as shown in Equation 8 ). Here, the design capacity may be a predetermined capacity as the full charge capacity at the time of shipment of the battery. The estimated SOC value through the above procedure represents the present capacity of the battery design capacity, and thus can have a numerical value of 0 or more and 1 or less.

In addition, the battery charge state estimation apparatus 200 updates the pre-stored OCV table using the estimated SOC value in step S309 (S310). As in step S309, the estimated SOC value using the current capacity of the battery 100 is sent to the memory and stored in the position of the SOC data corresponding to the OCV value used in the output accumulation method, so that the OCV table can be updated.

As described above, the present invention provides an SOC value estimation method using an Open Circuit Voltage (OCV) table of a battery which is hardly influenced by temperature characteristics in estimating the state of charge (SOC) of the battery And the SOC value estimation method using the output integration method, it is possible to estimate the SOC value of the battery with higher accuracy.

Further, by applying a Close Loop method of a feedback type in which the OCV table is updated by using the SOC value of the estimated battery, the accumulated error is minimized, and as a result, the SOC value with high accuracy is estimated can do.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention may be embodied in other specific forms. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the scope of the claims and their equivalents shall be construed as being included within the scope of the present invention.

100: battery 200: state of charge (SOC) estimation device
210: Measuring unit 211: Voltage sensor
212: current sensor 220:
230: Estimation unit 240: Memory

Claims (14)

A measuring unit for measuring voltage and current of the battery of the vehicle;
An arithmetic unit for calculating a current capacity of the battery using a voltage value and a current value measured by the measuring unit and a predetermined initial circuit voltage (Open Circuit Voltage, OCV) value of the battery;
A memory for storing an OCV table in which the OCV value and an SOC (State of Charge) value corresponding to the OCV value are tabulated; And
Estimating an SOC value of the battery using the OCV table or estimating an SOC value of the battery using a current capacity of the battery;
And a battery state estimation unit. The apparatus according to claim 1,
Determining whether the voltage value and the current value are initially measured, and setting the voltage value to the OCV value when it is determined to be the first measured value as the determination result
Battery charge state estimation device. The image processing apparatus according to claim 2,
Calculating an internal resistance value of the battery using the voltage value, the current value, and the OCV value as a result of the determination by the measurement unit; comparing the internal resistance value with a predetermined threshold resistance value To do
Battery charge state estimation device. The image processing apparatus according to claim 3,
If the internal resistance value is determined to be equal to or greater than the threshold resistance value or the current value is determined to be 0, the OCV value is transmitted to the estimator, and if the internal resistance value is less than the predetermined threshold value Calculating the current capacity of the battery using the internal resistance value if the current value is smaller than the resistance value and the current value is greater than 0
Battery charge state estimation device. 5. The apparatus according to claim 4,
Calculating a loss output value and a load side output value of the battery using the internal resistance value, the voltage value, and the current value, calculating a battery energy amount using the calculated loss output value and the load side output value, Calculating the current capacity of the battery using the calculated amount of battery energy
Battery charge state estimation device. 6. The apparatus according to claim 5,
Estimating an SOC value of the battery by acquiring an SOC value corresponding to the OCV value from the OCV table or estimating an SOC value of the battery by dividing a current capacity of the battery by a design capacity of a predetermined battery
Battery charge state estimation device. 7. The apparatus of claim 6,
And updating the OCV table using the SOC value estimated through the current capacity of the battery
Battery charge state estimation device. Measuring voltage and current of the battery of the vehicle;
Calculating a current capacity of the battery using a measured voltage value and a current value and an initial measured voltage (Open Circuit Voltage, OCV) value of the battery; And
Estimating an SOC value of the battery using an OCV table in which an OCV value and an SOC (State of Charge) value corresponding to the OCV value are tabulated, or estimating an SOC value of the battery using the current capacity of the battery ;
And estimating a state of charge of the battery. 9. The method of claim 8,
Determining whether the voltage value and the current value are initially measured; And
Setting the voltage value to the OCV value if it is determined to be the first measured value as a result of the determination;
And estimating the state of charge of the battery. 10. The method of claim 9,
Calculating an internal resistance value of the battery using the voltage value, the current value, and the OCV value as a result of the determination; And
Comparing the internal resistance value with a predetermined threshold resistance value;
Further comprising the steps of: 11. The method of claim 10,
Calculating a current capacity of the battery using the internal resistance value if the internal resistance value is smaller than the preset threshold resistance value and the current value is greater than 0;
Lt; / RTI > 12. The method of claim 11,
Calculating a loss output value and a load side output value of the battery using the internal resistance value, the voltage value, and the current value;
Calculating a battery energy amount using the calculated loss output value and the load side output value; And
Calculating a current capacity of the battery using the calculated amount of battery energy;
And estimating the state of charge of the battery. 13. The method of claim 12,
Estimating an SOC value of the battery using the OCV value and the OCV table when the internal resistance value is determined to be equal to or greater than the threshold resistance value or the current value is determined to be 0; And
Estimating an SOC value of the battery by dividing a current capacity of the battery by a predetermined design capacity of the battery;
And estimating the state of charge of the battery. 14. The method of claim 13,
Updating the OCV table using the SOC value of the battery estimated through the current capacity of the battery;
Further comprising the steps of:

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