KR102007902B1  System and method for estimated state of energy of battery  Google Patents
System and method for estimated state of energy of battery Download PDFInfo
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 KR102007902B1 KR102007902B1 KR1020150125098A KR20150125098A KR102007902B1 KR 102007902 B1 KR102007902 B1 KR 102007902B1 KR 1020150125098 A KR1020150125098 A KR 1020150125098A KR 20150125098 A KR20150125098 A KR 20150125098A KR 102007902 B1 KR102007902 B1 KR 102007902B1
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 battery
 value
 rate
 input
 soe
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 238000005259 measurement Methods 0.000 claims description 3
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 G—PHYSICS
 G01—MEASURING; TESTING
 G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
 G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
 G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
 G01R31/392—Determining battery ageing or deterioration, e.g. state of health

 G—PHYSICS
 G01—MEASURING; TESTING
 G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
 G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
 G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
 G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC

 G—PHYSICS
 G01—MEASURING; TESTING
 G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
 G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
 G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
 G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
 G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements

 G—PHYSICS
 G01—MEASURING; TESTING
 G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
 G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
 G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
 G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
Abstract
According to an embodiment of the present invention, a system for estimating remaining energy of a battery includes an SOC estimator for estimating a state of charge (SOC) value of a battery, a CPrate estimator for estimating a CPrate of the battery, and an SOC estimator and a CPrate estimate. And an SOE estimator for estimating SOC values and SOE values corresponding to CPrates estimated by the government.
Description
The present invention relates to a system and a method for estimating the remaining energy of a battery, and more particularly, to a system and a method for estimating the remaining energy of a battery that depends on the CPrate.
The current efficiency of the battery is close to 100% and uses the concept of state of charge (SOC). However, in the case of the amount of energy of the battery, since the efficiency depends on the CPrate, SOE (State Of Energy) cannot be introduced.
For example, even when the SOC of the battery is the same as 50%, using a high CPrate may use less energy, and using a lower CPrate may use more energy.
Since the voltage value input / output to the battery varies according to CPrate or temperature, the amount of power available in the same SOC is changed. Since the amount of energy (Wh) of the reference battery cell varies according to CPrate, It is difficult to estimate the quantity.
An object of the present invention is to provide a technique that can estimate the remaining energy of the battery that depends on the CPrate.
Technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following descriptions.
In accordance with an aspect of the present invention, there is provided a system for estimating remaining energy of a battery, including: an SOC estimator estimating a state of charge (SOC) value of a battery; And an SOE estimator for estimating the SOC value estimated by the SOC estimator and the CPrate estimator and a state of engey value corresponding to the CPrate.
The apparatus may further include an input / output power measuring unit measuring an input / output power of the battery, wherein the input / output power measuring unit further includes a current sensor measuring a current of the battery, and a voltage sensor measuring a voltage of the battery. Characterized in that.
The input / output power measuring unit may measure the input / output power value of the battery using the current value and the voltage value measured by the current sensor and the voltage sensor.
The CPrate estimating unit calculates the CPrate through the input / output power of the battery measured by the input / output power measuring unit.
The apparatus may further include a data storage configured to store a data table indicating a SOE value corresponding to the SOC value according to each CPrate.
The SOE estimator may receive a SOC value obtained through the SOC estimator and a CPrate value obtained through the CPrate estimator from a data table stored in the data storage.
The amount of chargeable energy and the amount of dischargeable energy of the battery may be estimated at a specific time point through the SOE value estimated by the SOE estimator.
On the other hand, the battery residual energy estimation method according to an embodiment of the present invention, estimating the SOC value of the battery, defining the CPrate of the battery, and the SOE value corresponding to the CPrate at a specific time point And estimating.
The defining of the CPrate may further include estimating the input / output power of the battery and calculating the CPrate value using the input / output power of the battery.
The estimating input / output power of the battery may further include measuring input / output current and input / output voltage of the battery, and calculating input / output power based on the input / output current and input / output voltage values.
The estimating of the SOE value at the specific time point may include estimating the SOE value corresponding to the CPrate and the SOC value from a data table indicating the SOE value corresponding to the SOC value according to each CPrate. It is done.
The method may further include calculating a charge and discharge amount of energy using the estimated SOE value.
According to the present invention, the remaining energy of the battery can be easily estimated by estimating the amount of chargeable energy and the amount of dischargeable energy using the CPrate and SOC values of the battery at a specific time point.
1 is a block diagram illustrating a system for estimating battery remaining energy according to an embodiment of the present invention.
2 is a flowchart illustrating a method of estimating battery remaining energy according to an embodiment of the present invention.
3 is a graph illustrating a relationship between a mobile CPrate and a realtime CPrate.
2 is a flowchart illustrating a method of estimating battery remaining energy according to an embodiment of the present invention.
3 is a graph illustrating a relationship between a mobile CPrate and a realtime CPrate.
The terms or words used in this specification and claims are not to be construed as limiting in their usual or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best describe their invention. Based on the principle that it can, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.
Therefore, the embodiments described in the present specification and the configuration shown in the drawings are only one of the most preferred embodiments of the present invention, and do not represent all of the technical idea of the present invention. It should be understood that there may be various equivalents and variations. In addition, in the description of the present invention, if it is determined that related related arts and the like may obscure the gist of the present invention, detailed description thereof will be omitted.
1 is a block diagram illustrating a system for estimating battery remaining energy according to an embodiment of the present invention.
Referring to FIG. 1, the battery residual energy estimation system includes a battery input / output power measuring unit 100 for measuring input / output power of a battery. The battery input / output power measuring unit 100 includes a battery current sensor 100a measuring a current of a battery and a battery voltage sensor 100b measuring a voltage of the battery.
The battery input / output power measuring unit 100 reads the current A value and the voltage value V of the battery through the current sensor 100a and the voltage sensor 100b of the battery, respectively. Thereafter, the input / output power value of the battery may be measured by calculating in the following manner.
Battery input / output power value (Power; W) = battery input / output current value (Current; A) × battery voltage value (Voltage; V)
In addition, the CPrate estimator 200 receiving the battery input / output power value measured by the battery input / output power measurement unit 100 is provided.
CPrate means the charge / discharge rate of the battery, and represents the ratio of the input / output power of the battery to the rated capacity of the battery. In general, the unit of CPrate is indicated by C.
CPrate = current input / output power value [W] / rated energy amount of battery [Wh]
The rated capacity of the battery pack
For example, when the rated energy amount of the battery is 2000mAh, when charging with CPrate of 1.5C, the input and output power value is 3000W, the charging time may be 2/3 hours (h).
In addition, when the battery has a rated capacity of 2000mAh, when charging with a CPrate of 0.5C, the input and output power value is 1000W, the charging time may be 2 hours (h).
The SOC estimator 250 estimates a state of charge (SOC) value of the battery.
The SOC of the battery is a value representing the percentage of remaining capacity of the battery.
For example, assuming that 100 Ah of battery is used for 1 hour at 70 A, the remaining capacity of the battery is 30 Ah. In this case, the current SOC of the battery may be estimated at 30% based on 100 Ah.
A SOE estimator 400 for estimating a battery SOE value at a specific time is provided.
The SOE estimator 400 receives the SOC value and the CPrate value into the SOC estimator 250 and the CPrate estimator 200, respectively.
The SOE estimator 400 includes a data storage 300. The data storage unit 300 stores a data table indicating a state of energy (SOE) value corresponding to the SOC value according to each CPrate.
For example, in the data table stored in the data storage unit 300, when the SOC of the current battery is 30%, the SOE of 1CPrate is 28%, the SOE of 2CPrate is 26%, and the SOE of 3CPrate is 24%. Similarly, SOE values are associated with each CPrate.
The SOC value and the SOE value corresponding to the CPrate may be estimated using the data table stored in the data storage unit 300.
The SOE estimator 400 may estimate the amount of chargeable energy and the amount of dischargeable energy of the battery at a specific time point through the estimated SOE value.
For example, assuming that the SOC value is 50 at an energy of 100 Wh at 1 CPrate, an SOE value corresponding to 1CPrate and SOC value 50 is estimated on the data table. If the SOE value at this time is 48%, the amount of energy that can be charged becomes 52 Wh, and the amount of energy that can be discharged can be estimated to be 48 Wh.
2 is a flowchart illustrating a method of estimating battery remaining energy according to an embodiment of the present invention.
Referring to FIG. 2, the input / output power of the battery is measured through the battery input / output measuring unit (100 in FIG. 1) (S100).
The input / output power value of the battery (charge / discharge power value of the battery) measures the current value of the battery in the battery current sensor included in the input / output measuring unit of the battery, and measures the voltage value of the battery in the battery voltage sensor.
Subsequently, the input / output power value of the battery may be measured by calculating the battery input / output current value (C) × the battery voltage value (Voltage (V)).
Then, the step of estimating the SOC value of the battery proceeds (step S110).
The SOC value of the battery may be obtained through the SOC estimator 250 (see FIG. 1).
The SOC is a value indicating the remaining capacity ratio of the battery. When the 100Ah battery is used at 70A for 1 hour, the remaining capacity becomes 30Ah. Based on 100 Ah, the battery's current SOC can be estimated at 30%.
Next, a step of defining CPrate of the battery is performed (step S120).
The step of defining the CPrate of the battery may be defined through the input / output power value of the battery measured in step S100.
The formula for calculating CPrate is as follows.
CPrate = current input / output power value [W] / rated energy amount of battery [Wh]
In addition, the moving average CPrate represents the average value of the CPrate for a certain time, for example, the 5minute moving average CPrate can be obtained as the sum of the CPrate of the last five minutes / the number of samples. have.
When the pattern of the input / output power value of the battery is irregular, the following input / output power value pattern for the irregular input / output power value pattern may be estimated through the moving average CPrate value obtained in the above manner.
3 is a graph illustrating real time CPrate (A) and moving CPrate (B) measured in real time. Here, the X axis represents time and the Y axis represents CPrate.
Referring to the graph as shown in FIG. 3, the value of the mobile CPrate may be predicted according to the change of the CPrate measured in real time.
Then, a step of estimating the SOE value at a specific time point is performed (step S130.).
The SOE value at a specific time point may be estimated using the SOC value of the battery estimated in step S110 and the CPrate estimated in step S120.
A data table indicating an SOE value corresponding to the SOC value for each CPrate is stored in the data storage unit 300 (in FIG. 1).
For example, the data table shows that when the SOC of the current battery is 30%, the SOE of 1CPrate is 28%, the SOE of 2CPrate is 26%, and the SOE of 3CPrate is 24%. The values are mapped.
Through such a data table, the SOC value and the SOE value corresponding to the CPrate at a specific time point can be estimated. In this case, values between those not shown in the data table may be calculated through interpolation.
Next, a step of calculating the amount of energy that can be charged and discharged is performed using the estimated SOE value (step S140).
For example, assuming that the SOC value is 50 at an energy of 100 Wh at 1 CPrate, an SOE value corresponding to 1CPrate and SOC value 50 is estimated on the data table. If the SOE value at this time is 48%, the amount of chargeable energy is 52Wh, and the amount of dischargeable energy is 48Wh.
As described above, the CPrate and SOC values of the battery may be calculated, and the SOE value corresponding to the SOC value in the CPrate may be estimated. By calculating the CPrate in real time, it is possible to estimate the remaining energy of the battery by estimating the amount of chargeable and dischargeable energy of the battery.
The above description is merely illustrative of the technical idea of the present application, and those skilled in the art to which the present application pertains may various modifications and variations without departing from the essential characteristics of the present application.
Therefore, the embodiments disclosed in the present application are not intended to limit the technical spirit of the present application but to describe the present invention, and the scope of the technical spirit of the present application is not limited by these embodiments.
The scope of protection of the present application should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.
100: input and output power measurement unit
100a: current sensor
100b: voltage sensor
200: CPrate estimator
250: SOC estimator
300: data storage
400: SOE estimator
100a: current sensor
100b: voltage sensor
200: CPrate estimator
250: SOC estimator
300: data storage
400: SOE estimator
Claims (13)
 An input / output power measurement unit measuring an input / output power of the battery;
An SOC estimator estimating a state of charge (SOC) value of the battery;
A CPrate estimator for estimating a moving average CPrate which is an average value of CPrates for a predetermined time of the battery; And
SOE estimator for estimating the SOC value estimated by the SOC estimator and CPrate estimator and a state of engey value corresponding to a moving average CPrate at a specific time point
Including;
The CPrate estimator calculates a moving average CPrate based on the input / output power of the battery measured by the input / output power measuring unit.  delete
 The method according to claim 1,
The input / output power measuring unit
A current sensor measuring a current of the battery; And
A voltage sensor measuring the voltage of the battery
Residual energy estimation system of a battery, characterized in that it further comprises.  The method according to claim 3,
The input / output power measuring unit
Residual energy estimation system of the battery, characterized in that for measuring the input and output power value of the battery using the current value and the voltage value measured by the current sensor and the voltage sensor.  delete
 The method according to claim 1,
The SOE estimator
Data storage unit that stores data table showing SOE value corresponding to SOC value according to each moving average CPrate
Residual energy estimation system of a battery, characterized in that it further comprises.  The method according to claim 6,
The SOE estimator
And estimating a value corresponding to a SOC value obtained through the SOC estimator and a moving average CPrate value obtained through the CPrate estimator from a data table stored in the data storage unit.  The method according to claim 1,
The remaining energy estimation system of the battery, characterized in that for estimating the amount of chargeable and dischargeable energy of the battery at a specific time point through the SOE value estimated by the SOE estimator.  Estimating the SOC value of the battery;
Defining a moving average CPrate which is an average value of CPrates for a predetermined time of the battery; And
Estimating an SOE value corresponding to the moving average CPrate and SOC value at a specific time point
Including;
Defining the moving average CP rate
Estimating input / output power of the battery; And
Calculating the moving average CP rate using the input / output power of the battery
Residual energy estimation method of the battery, characterized in that it further comprises.  delete
 The method according to claim 9,
Estimating the input / output power of the battery
Measuring an input / output current and an input / output voltage of the battery; And
Calculating input / output power based on the input / output current and input / output voltage values
Residual energy estimation method of the battery, characterized in that it further comprises.  The method according to claim 9,
Estimating the SOE value at the specific time point
And estimating the SOE value corresponding to the moving average CPrate and the SOC value in a data table showing the SOE value corresponding to the SOC value according to each moving average CPrate.  The method according to claim 9,
Calculating the amount of energy that can be charged and discharged using the estimated SOE value
Residual energy estimation method of the battery, characterized in that it further comprises.
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JP2002228730A (en)  20010206  20020814  Shikoku Electric Power Co Inc  Residual electric energy estimating device for secondary battery 
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