KR102007902B1 - System and method for estimated state of energy of battery - Google Patents

System and method for estimated state of energy of battery Download PDF

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Publication number
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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South Korea
Prior art keywords
battery
value
rate
input
soe
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KR1020150125098A
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Korean (ko)
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KR20170028183A (en
Inventor
윤성열
강정수
김진만
안현철
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주식회사 엘지화학
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392Determining battery ageing or deterioration, e.g. state of health
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3842Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396Acquisition 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 CP-rate estimator for estimating a CP-rate of the battery, and an SOC estimator and a CP-rate estimate. And an SOE estimator for estimating SOC values and SOE values corresponding to CP-rates estimated by the government.

Description

Battery remaining energy estimation system and estimation method {SYSTEM AND METHOD FOR ESTIMATED STATE OF ENERGY OF BATTERY}
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 CP-rate.
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 CP-rate, SOE (State Of Energy) cannot be introduced.
For example, even when the SOC of the battery is the same as 50%, using a high CP-rate may use less energy, and using a lower CP-rate may use more energy.
Since the voltage value input / output to the battery varies according to CP-rate 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 CP-rate, 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 CP-rate.
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 CP-rate estimator and a state of engey value corresponding to the CP-rate.
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 CP-rate estimating unit calculates the CP-rate 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 CP-rate.
The SOE estimator may receive a SOC value obtained through the SOC estimator and a CP-rate value obtained through the CP-rate 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 CP-rate of the battery, and the SOE value corresponding to the CP-rate at a specific time point And estimating.
The defining of the CP-rate may further include estimating the input / output power of the battery and calculating the CP-rate 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 CP-rate and the SOC value from a data table indicating the SOE value corresponding to the SOC value according to each CP-rate. 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 CP-rate 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 CP-rate and a real-time CP-rate.
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 CP-rate estimator 200 receiving the battery input / output power value measured by the battery input / output power measurement unit 100 is provided.
CP-rate 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 CP-rate is indicated by C.
CP-rate = 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 CP-rate 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 CP-rate 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 CP-rate value into the SOC estimator 250 and the CP-rate 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 CP-rate.
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 1CP-rate is 28%, the SOE of 2CP-rate is 26%, and the SOE of 3CP-rate is 24%. Similarly, SOE values are associated with each CP-rate.
The SOC value and the SOE value corresponding to the CP-rate 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 CP-rate, an SOE value corresponding to 1CP-rate 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 CP-rate of the battery is performed (step S120).
The step of defining the CP-rate of the battery may be defined through the input / output power value of the battery measured in step S100.
The formula for calculating CP-rate is as follows.
CP-rate = current input / output power value [W] / rated energy amount of battery [Wh]
In addition, the moving average CP-rate represents the average value of the CP-rate for a certain time, for example, the 5-minute moving average CP-rate can be obtained as the sum of the CP-rate 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 CP-rate value obtained in the above manner.
3 is a graph illustrating real time CP-rate (A) and moving CP-rate (B) measured in real time. Here, the X axis represents time and the Y axis represents CP-rate.
Referring to the graph as shown in FIG. 3, the value of the mobile CP-rate may be predicted according to the change of the CP-rate 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 CP-rate estimated in step S120.
A data table indicating an SOE value corresponding to the SOC value for each CP-rate 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 1CP-rate is 28%, the SOE of 2CP-rate is 26%, and the SOE of 3CP-rate is 24%. The values are mapped.
Through such a data table, the SOC value and the SOE value corresponding to the CP-rate 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 CP-rate, an SOE value corresponding to 1CP-rate 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 CP-rate and SOC values of the battery may be calculated, and the SOE value corresponding to the SOC value in the CP-rate may be estimated. By calculating the CP-rate 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: CP-rate estimator
250: SOC estimator
300: data storage
400: SOE estimator

Claims (13)

  1. 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 CP-rate estimator for estimating a moving average CP-rate which is an average value of CP-rates for a predetermined time of the battery; And
    SOE estimator for estimating the SOC value estimated by the SOC estimator and CP-rate estimator and a state of engey value corresponding to a moving average CP-rate at a specific time point
    Including;
    The CP-rate estimator calculates a moving average CP-rate based on the input / output power of the battery measured by the input / output power measuring unit.
  2. delete
  3. 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.
  4. 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.
  5. delete
  6. 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 CP-rate
    Residual energy estimation system of a battery, characterized in that it further comprises.
  7. 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 CP-rate value obtained through the CP-rate estimator from a data table stored in the data storage unit.
  8. 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.
  9. Estimating the SOC value of the battery;
    Defining a moving average CP-rate which is an average value of CP-rates for a predetermined time of the battery; And
    Estimating an SOE value corresponding to the moving average CP-rate 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.
  10. delete
  11. 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.
  12. 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 CP-rate and the SOC value in a data table showing the SOE value corresponding to the SOC value according to each moving average CP-rate.
  13. 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.
KR1020150125098A 2015-09-03 2015-09-03 System and method for estimated state of energy of battery KR102007902B1 (en)

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CN107238803B (en) * 2017-07-10 2019-11-01 安徽锐能科技有限公司 For estimating the method and computer readable storage medium of battery SOE
CN110824363A (en) * 2019-10-21 2020-02-21 江苏大学 Lithium battery SOC and SOE joint estimation method based on improved CKF

Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2002228730A (en) 2001-02-06 2002-08-14 Shikoku Electric Power Co Inc Residual electric energy estimating device for secondary battery
US20120112754A1 (en) 2010-11-10 2012-05-10 Denso Corporation Apparatus quantifying state-of-charge of vehicle-mounted rechargeable battery

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TW535308B (en) * 2000-05-23 2003-06-01 Canon Kk Detecting method for detecting internal state of a rechargeable battery, detecting device for practicing said detecting method, and instrument provided with said
KR101184081B1 (en) * 2010-09-17 2012-09-19 한국과학기술원 Battery Capacity Calculation Device for Electric Moving Bodies

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002228730A (en) 2001-02-06 2002-08-14 Shikoku Electric Power Co Inc Residual electric energy estimating device for secondary battery
US20120112754A1 (en) 2010-11-10 2012-05-10 Denso Corporation Apparatus quantifying state-of-charge of vehicle-mounted rechargeable battery

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