KR20220147953A - Apparatus for measuring state of rechargeable batteries and method for measuring state of rechargeable batteries using it - Google Patents

Abstract

The present invention relates to an apparatus and method for measuring the state of a rechargeable battery. According to the present invention, to solve a problem of conventional rechargeable batteries which had limitations in being unable to control charging in various ways because a method for accurately checking the charge rate and state of a battery changing over time with respect to in various cases, such as charging, discharging, charging simultaneously with discharging, non-charging, and non-discharging of a rechargeable battery, has not been provided, the apparatus is configured to precisely measure the initial charging rate at the time of battery use and the change in charging rate after the start of use by using a charging current sensor, a discharging current sensor, a voltage measuring circuit, and a microcontroller (MCU) such that the state of charge (SOC) of the battery can be accurately measured in various cases and the state of health and remaining life (remnant cycles) of the battery can be accurately predicted by comparing the current maximum energy, which can be discharged, with a rated discharge energy value. The apparatus comprises a voltage measurement unit, a charging current measurement unit, a discharging current measurement unit, a charging unit, a discharging unit, and a control unit.

Description

Apparatus for measuring state of rechargeable batteries and method for measuring state of rechargeable batteries using it

The present invention relates to an apparatus and method for measuring the state of a rechargeable battery, and more particularly, in general, in the case of a rechargeable battery, when in use, it discharges up to 10 to 20% of the battery's energy capacity, and when charging, the state of charge (State) Of Charge (SOC) It is desirable to charge from 10 to 20% to 80 to 90% of the charging rate and use it in terms of extending battery life and saving charging time. Problems of rechargeable batteries of the prior art, which cannot control the charging of the battery in various ways, because a method for accurately grasping the charging rate and state of the battery that varies over time in various cases, such as overdischarge and non-discharge, is not provided. In order to solve the problem, the present invention relates to an apparatus for measuring a state of a rechargeable battery configured to accurately measure a charge rate (SOC) of a rechargeable battery in various cases, and a method for measuring a state of a rechargeable battery using the same.

In addition, the present invention, as described above, does not provide an apparatus or method for accurately grasping the charging rate and state of the battery that varies with time in various cases as described above. In order to solve the problem of rechargeable batteries of the technology, it is possible to precisely measure the initial charge rate at the time of battery use and the change in the charge rate after the start of use by using a charge current sensor, a discharge current sensor, a voltage measurement circuit, and a microcontroller (MCU). By being configured so that, for example, when the battery is charged without discharging, when only discharging without charging, when discharging at the same time as charging, when not charging and not discharging, etc. The present invention relates to an apparatus for measuring the state of a rechargeable battery and a method for measuring the state of a rechargeable battery using the same, which is configured to accurately measure an initial charge rate of a battery and a charge rate that changes over time.

In addition, the present invention can accurately measure the charging rate of the battery in various cases such as charging, discharging, discharging the battery at the same time as charging, not using, etc., when starting to use the battery, as described above, and at the same time, The state of health (SOH) and residual cycle (Remnant Cycles) of the battery are accurately predicted by comparing the energy and the rated discharge energy value. it's about

Recently, with the development of information and communication technology, for example, the demand for portable personal information communication devices, such as a smart phone, a tablet PC, and a notebook computer, is increasing. The supply and demand of electric vehicles are increasing, and accordingly, the demand for batteries provided in such various information and communication devices or electric vehicles is also increasing.

Here, these batteries are configured to be rechargeable, so that they can be recharged and used again after being discharged after being used for a certain period of time after charging. do.

However, in general, since the performance and charging efficiency of such rechargeable batteries decrease as charging and discharging are repeated, in order to use the battery efficiently for a longer period of time, charging and discharging are required in an appropriate manner according to the state of the battery.

That is, in the case of a rechargeable battery, in general, it is used to discharge only 10 to 20% of the battery capacity during use, and when charging, it is recommended to charge from 10 to 20% to 80 to 90% of the battery capacity. It is known to be preferable in terms of time saving.

In addition, in recent years, for example, by appropriately controlling the charging of the battery according to the needs of the user for various cases, such as charging, discharging, and discharging at the same time as charging, uncharging and non-discharging of the battery, the lifespan of the battery and Research to improve efficiency is being actively conducted.

Here, as an example of the prior art related to a method and an apparatus for improving the life and efficiency of a rechargeable battery as described above, first, for example, a "high-speed and a method of improving charging time efficiency through low-speed charging."

More specifically, the above-mentioned Korean Patent Application Laid-Open No. 10-2021-0027583 discloses a first step of determining whether an external power source for charging is connected to an electric vehicle; a second step of checking whether the refrigerator of the electric vehicle is turned off; a third step of turning on an On-Board Charger (OBC) in an electric vehicle when the refrigerator is turned off in the second step; a fourth step of determining the charge rate of the battery by measuring the voltage of the electric vehicle battery when the OBC is turned on; When the charge rate of the battery is below a certain level, including the fifth step of charging with a high current, in the initial stage, it is quickly charged through fast charging, and when it reaches a certain rate, it is fully charged through low-speed charging, so that 100% with fast charging It relates to a charging time efficiency method through high-speed and low-speed charging, which is configured to compensate for excessive charging time due to low-speed charging while improving the problem of impossible charging.

In addition, as another example of the prior art related to the management method and apparatus for improving the life and efficiency of the rechargeable battery as described above, for example, "electronic Battery management methods in devices and electronic devices".

More specifically, the aforementioned Korean Patent Application Laid-Open No. 10-2016-0060476 discloses a battery; and a processor controlling the battery to be charged at a second charging rate smaller than the first charging rate set for the battery according to the battery charging condition. The present invention relates to an electronic device and a battery management method in an electronic device configured to reduce battery charging time or to reduce battery damage by managing the battery so as to prevent a decrease in battery capacity thereby.

As described above, in the related art, various technical contents have been presented with respect to methods and apparatuses for improving the lifespan and efficiency of rechargeable batteries, but the contents of the prior art as described above have the following problems.

More specifically, in general, in order to adaptively charge the battery according to the use of the battery, for example, when the battery is only charged without discharging, when the battery is only discharged without being charged, when the battery is discharged simultaneously with charging It is required to control charging by accurately grasping the initial state of charge (SOC) of the battery and the charging rate that varies with the lapse of time in various cases, such as when neither charging nor discharging.

However, in the prior art as described above, only the technical content of controlling the charging according to the charging rate is presented, and there is no presentation of the technical content for accurately measuring the charging rate (SOC).

Moreover, since the efficiency and capacity of the rechargeable battery decrease as charging and discharging are repeated, for example, the number of times it can be recharged and used, ie, the lifespan, is fixed, such as 500 times, 1,000 times, etc. The contents have not been presented with respect to a configuration that can measure and inform the current state of health (SOH) or residual cycle (Remnant Cycles) of the battery as described above.

Therefore, as described above, in order to solve the problems of the rechargeable battery of the prior art in which the charge rate (SOC), the state of health (SOH), and the remaining life of the rechargeable battery cannot be accurately determined, in order to solve the problem of the rechargeable battery in the related art, it is recharged with a relatively simple configuration and low cost. It is possible to accurately measure the charge rate (SOC) of a battery at the start of use, charging, discharging, discharging at the same time as charging, not using, etc., and at the same time, the current state of health (SOH) and residual life (Remnant Cycles) of the battery, etc. It is desirable to present an apparatus and method for measuring the state of a rechargeable battery of a new configuration that is configured to provide comprehensive information on the state of the battery. to be.

Korean Patent Publication No. 10-2021-0027583 (2021.03.11.) Korean Patent Publication No. 10-2016-0060476 (2016.05.30.)

The present invention is to solve the problems of the prior art as described above, and therefore, an object of the present invention is, in general, in the case of a rechargeable battery, discharging up to 10 to 20% of the battery's energy capacity when in use and charging at a charge rate of 10 It is advantageous in terms of extending battery life and saving charging time to use it by charging from ~ 20% to 80 to 90% of charging rate, but for example, charging, discharging, discharging the battery at the same time as charging, non-charging and non-discharging, etc. In order to solve the problem of rechargeable batteries of the prior art, which has a limitation in that it is impossible to control the charging of the battery in various ways because a method for accurately grasping the charging rate and state of the battery that varies with time in various cases is not provided, An object of the present invention is to provide an apparatus for measuring a state of a rechargeable battery configured to accurately measure a state of charge (SOC) of the rechargeable battery, and a method for measuring a state of a rechargeable battery using the same.

In addition, another object of the present invention is that, as described above, a method for accurately grasping the charging rate and state of the battery that varies with time in various cases as described above is not provided, so there is a limitation in that it is not possible to control the charging of the battery in various ways. In order to solve the problems of the rechargeable batteries of the prior art, the initial charge rate at the time of battery use and the change in the charge rate after the start of use are precisely measured using a charge current sensor, a discharge current sensor, a voltage measurement circuit, and a microcontroller (MCU). By being configured so that, for example, when the battery is charged without discharging, when only discharging without charging, when discharging simultaneously with charging, when neither charging nor discharging, etc. An object of the present invention is to provide an apparatus for measuring the state of a rechargeable battery and a method for measuring the state of a rechargeable battery using the same, which is configured to accurately measure the initial charge rate of the battery and the charge rate that changes over time.

In addition, another object of the present invention is to accurately measure the charge rate of the battery in various cases such as charging, discharging, discharging at the same time as charging, not using, etc., when starting to use the battery, as described above, and By comparing the current maximum discharging energy and the rated discharging energy value, the state of health (SOH) and residual life (Remnant Cycles) of the battery can be accurately predicted, and the state of the rechargeable battery using the same It is intended to provide a state measurement method.

In order to achieve the above object, according to the present invention, there is provided an apparatus for measuring the state of a rechargeable battery, comprising: a voltage measuring unit for measuring the voltage of the rechargeable battery; a charging current measuring unit including a charging current sensor for measuring the charging current of the rechargeable battery; a discharge current measuring unit including a discharge current sensor for measuring a discharge current of the rechargeable battery; a charging unit including a charging circuit for charging the rechargeable battery; a discharging unit including a load for discharging the rechargeable battery; and controlling the overall operation of the measuring device, and based on the measured values of the charging voltage, charging current, discharging voltage, and discharging current of the rechargeable battery, the state of charge (SOC), the state of health (State) of the rechargeable battery A state measuring device of a rechargeable battery, characterized in that it comprises a control unit configured to perform a process of calculating and outputting information on the state of the rechargeable battery including SOH (SOH) and Remnant Cycles provided

Here, the voltage measuring unit includes: a reference voltage generator for generating a predetermined reference voltage under the control of the control unit; a voltage multiplier amplifier for reducing the measured voltage of the rechargeable battery by a predetermined constant multiple; and a voltage comparison amplifier for amplifying a difference between the voltage of the rechargeable battery and the reference voltage by inputting the voltage reduced through the voltage multiplier amplifier and the reference voltage generated through the reference voltage generator, respectively characterized in that

In addition, the voltage multiplier amplifier is characterized in that it is composed of an amplifier circuit including a plurality of operational amplifiers (OP AMP) and a low-pass filter (LPF) for reducing noise.

In addition, the voltage comparison amplifier is characterized in that it is configured in the form of a symmetrical differential amplifier including a plurality of operational amplifiers (OP AMP) and an EMI filter provided at an input terminal to remove noise.

Furthermore, the control unit may include: an AD converter for converting a charging voltage measurement signal and a discharge voltage measurement signal of the rechargeable battery received from the voltage measurement unit into a digital signal; a low-pass filter for removing noise from the digital signal converted through the AD converter; Measured values for charging voltage, discharging voltage, charging current, discharging current, charging time and discharging time according to the time and charging rate measured for each type of rechargeable battery, and data on the rated characteristics predetermined for each rechargeable battery A battery characteristic information database constructed by collecting each type of each rechargeable battery and storing it in a database form is stored in advance, and includes a data storage means for storing various data including each measured value and calculated value A data storage unit made by; and receiving the charging voltage measuring signal and the discharging voltage measuring signal from which noise is removed through the low-pass filter, the charging current measuring signal from the charging current measuring unit, and the discharging current measuring signal from the discharging current measuring unit, respectively. and, based on each measurement value and data stored in the battery characteristic information database, the initial charge rate (SOC) of the rechargeable battery, the cumulative charge rate in the charged or discharged state (SOC), the state of health (SOH), and the remaining and a data processing unit configured to perform data processing for calculating the lifespan, respectively, and control processing for controlling the overall operation of the measuring device.

Here, the controller controls the reference voltage of the reference voltage generator until the output of the voltage comparison amplifier becomes 0, and sets the value of the reference voltage when the output of the voltage comparison amplifier becomes 0 to the rechargeable battery It is characterized in that it is configured to perform a process of calculating a voltage value of and storing it in the data storage unit.

In addition, the control unit, when the charging voltage at the charging time t ₁ is V ₁ , and the charging voltage at the charging time t ₂ is V ₂ , in the section between t ₁ and t ₂ using the following equation Calculate the charging voltage Vc,

When the charging current at the charging time t ₁ is I ₁ and the charging current at the charging time t ₂ is I ₂ , the charging current Ic in the section between t ₁ and t ₂ is calculated using the following equation, ,

Calculate the charging power Pc supplied from the calculated charging voltage (Vc) and charging current (Ic) from time t ₁ to time t ₂ using the following equation,

The energy W _1,2 supplied between time t ₁ and time t ₂ is calculated using the following equation,

The charging energy W _i,i+1 in each measurement section between the time of full discharge t0 and the time of full charge tn is calculated using the following equation,

Using the following equation, calculate the initial charge rate SOC(t _i ) at each measurement time t _i for the rechargeable battery,

At each measurement time t _i , the charging voltage Vci, the charging energy W(t _i ), and the charging rate SoC(ti) are calculated, respectively, and the charging voltage, the charging energy and the charging time according to the charging rate are calculated respectively using a linear interpolation method. It is characterized in that the information on the charging characteristics is calculated, and the information on the discharging characteristics is calculated in the same way, respectively, and a process of storing the information in the data storage unit is configured to be performed.

In addition, when discharging is performed simultaneously with charging, the control unit calculates the charging energy Wc from the measured voltage and charging current value, calculates the discharging energy Wd from the measured voltage and the discharging current value, and sets the initial charging rate to SoC _i , When the rated total energy that can be stored in the rechargeable battery is Wt, the charging rate SoC is calculated using the following equation and stored in the data storage unit.

Furthermore, when the rechargeable battery is neither charged nor discharged, when the rechargeable battery is in an unused state, the charging current stored in advance in the battery characteristic information database to prevent an error due to hysteresis of the battery After charging with a predetermined charging current for a corresponding charging transient time based on the charging transient time information according to

In addition, the control unit, the current dischargeable maximum energy of the rechargeable battery calculated on the basis of the measured values respectively measured through the voltage measuring unit, the charging current measuring unit, and the discharging current measuring unit and the rated discharge stored in the database and calculating the health state of the rechargeable battery and storing it in the data storage unit by comparing the energy values and expressing it as a Depth of Discharge (DoD (%)) .

In addition, the control unit stores the number of charge-discharge cycles (N) of the rechargeable battery as a function of the degree of discharge (DoD (%)) in the data storage unit using the following equation, and stores the rechargeable battery and calculating a difference between the current number of cycles and the number of cycles when the degree of discharge (DoD) is 50% as a residual life and storing the difference in the data storage unit is configured to be performed.

(Here, N ₁ and N ₀ each represent a predetermined constant according to the characteristics of the battery)

Furthermore, the measuring device is configured to further include a display means or an output means including an LCD or LED, and display means for displaying various data including each measured value and calculated value as information on the state of the rechargeable battery. It is characterized in that it is configured such that the processing for displaying through or outputting through the output means is performed through the control unit.

In addition, the measuring device is configured to further include a communication means capable of communicating in at least one of wired or wireless communication, and includes at least one of a smartphone, a tablet PC, or a notebook computer for information about the state of the rechargeable battery. It is characterized in that it is configured to remotely check and manage the state of the rechargeable battery by being configured to perform a process of transmitting to a user terminal or an external device including a server through the control unit.

In addition, according to the present invention, in the method for measuring the state of a rechargeable battery using the state measuring device of the rechargeable battery described above, measurement data and rating data for the charging and discharging characteristics are collected for each type of the rechargeable battery, and the rechargeable battery A database building step in which the process of building a database for the charging characteristics and discharging characteristics is performed; a charging rate calculation step in which a process of calculating a charging rate (SOC) of the rechargeable battery is performed based on the measured values of the voltage, charging current and discharging current of the rechargeable battery and data stored in the database; A health in which a process of calculating the health state (SOH) and the residual life (Remnant Cycles) of the rechargeable battery by comparing the current maximum dischargeable energy of the rechargeable battery obtained through measurement with the rated discharge energy value stored in the database is performed state and remaining life calculation step; and a battery state information providing step in which a process of displaying information on the state of the rechargeable battery or providing corresponding information according to a user's request is performed based on each of the measured values and calculated values A method for measuring the state of a rechargeable battery is provided.

As described above, according to the present invention, the state of charge (SOC) at the time of battery use and the charge rate after the start of use using a charging current sensor, a discharging current sensor, a voltage measuring circuit and a microcontroller (MCU) By providing an apparatus for measuring the state of a rechargeable battery and a method for measuring the state of a rechargeable battery using the same, which are configured to accurately measure the change, for example, when the battery is charged without discharging, when only discharging without charging , when charging and discharging at the same time, when neither charging nor discharging, etc., can accurately measure the initial charging rate of the battery and the charging rate that varies with the passage of time.

In addition, according to the present invention, there is provided an apparatus for measuring the state of a rechargeable battery and a method for measuring the state of a rechargeable battery using the same, which are configured to accurately grasp the charging rate and state of the battery that varies with time in various cases as described above. , In general, in the case of a rechargeable battery, it is recommended to discharge 10 to 20% of the battery's energy capacity when in use and charge it at a charge rate of 10 to 20% to 80 to 90% of the charge rate when charging, in terms of extending battery life and saving charging time. However, for various cases such as charging, discharging, discharging at the same time as charging, non-charging and non-discharging of the battery, a method for accurately identifying the charging rate and state of the battery that varies with time is not provided. Therefore, it is possible to solve the problems of the rechargeable batteries of the prior art, which had a limit in which the charging of the battery could not be controlled in various ways.

In addition, according to the present invention, in addition to being able to accurately measure the charging rate and state of the battery that varies with time in various cases as described above, the current maximum energy that can be discharged and the rated discharge energy value of the battery are compared to improve the health of the battery. By providing a state measuring device for a rechargeable battery and a method for measuring the state of a rechargeable battery using the same, which are configured to accurately predict the State of Health (SOH) and Remnant Cycles, when starting to use the battery, charging the battery, It is possible to provide comprehensive information about the overall state of the battery by accurately measuring the health state and remaining life of the battery as well as the charge rate of the battery in various cases such as discharging and discharging at the same time as discharging and charging, and not using the battery.

1 is a diagram schematically showing the overall configuration of an apparatus for measuring a state of a rechargeable battery according to an embodiment of the present invention.
FIG. 2 is a diagram schematically illustrating a specific configuration of a voltage measuring unit and a control unit of the apparatus for measuring the state of a rechargeable battery according to the embodiment of the present invention shown in FIG. 1 .
FIG. 3 is a diagram schematically showing a specific configuration of a voltage multiplier amplifier of the voltage measuring unit shown in FIG. 2 .
FIG. 4 is a diagram schematically showing a specific configuration of a voltage comparison amplifier of the voltage measuring unit shown in FIG. 2 .
5 is a view showing the results of measurements on the charging characteristics of the battery arranged in a table.
6 is a view showing the measurement results of the charging voltage, the charging energy, and the charging time according to the charging rate arranged in a table.
7 is a view showing the results of measurements on the discharge characteristics of the battery arranged in a table.
8 is a view showing the measurement results of the discharge voltage, the discharge energy, and the discharge time according to the charging rate in a table.
9 is a flowchart schematically illustrating an overall configuration of a method for measuring a state of a rechargeable battery according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus for measuring a state of a rechargeable battery and a method for measuring a state of a rechargeable battery using the same according to the present invention will be described with reference to the accompanying drawings.

Here, it should be noted that the content described below is only one embodiment for carrying out the present invention, and the present invention is not limited to the content of the embodiment described below.

In addition, in the following description of the embodiments of the present invention, for parts that are the same as or similar to those of the prior art, or that can be easily understood and implemented at the level of those skilled in the art, the detailed description is provided for the sake of brevity. It should be noted that o was omitted.

That is, in the present invention, as will be described later, in general, in the case of a rechargeable battery, when used, it is discharged to 10 to 20% of the battery's energy capacity, and when charging, it is charged from a charging rate of 10 to 20% to a charging rate of 80 to 90%. Although it is advantageous in terms of extending battery life and saving charging time, for example, the charging rate of the battery and In order to solve the problems of the rechargeable batteries of the prior art in which a method for accurately grasping the state was not provided and thus the charge of the battery could not be controlled in various ways, the charge rate (SOC) of the rechargeable battery was accurately measured in various cases. It relates to an apparatus for measuring the state of a rechargeable battery and a method for measuring the state of a rechargeable battery using the same.

In addition, the present invention, as will be described later, in the prior art in which a method for accurately grasping the charging rate and state of the battery, which varies with time in various cases, is not provided, and thus there is a limitation in that it is not possible to control the charging of the battery in various ways. In order to solve the problems of rechargeable batteries of By being configured so that, for example, when the battery is charged without discharging, when only discharging without charging, when discharging simultaneously with charging, when neither charging nor discharging the battery, for various cases, such as when the battery is not discharged The present invention relates to an apparatus for measuring the state of a rechargeable battery and a method for measuring the state of a rechargeable battery using the same, configured to accurately measure the initial charge rate of the battery and the charge rate that changes over time.

Furthermore, as described later, the present invention can accurately measure the charge rate of the battery in various cases such as charging, discharging, discharging the battery simultaneously with charging, non-use, etc. The present invention relates to an apparatus for measuring the state of a rechargeable battery and a method for measuring the state of a rechargeable battery using the same, configured to accurately predict the health state (SOH) and residual life (Remnant Cycles) of the battery by comparing the maximum energy and the rated discharge energy value.

Subsequently, with reference to the drawings, the specific content of the apparatus for measuring the state of the rechargeable battery and the method for measuring the state of the rechargeable battery using the same according to the present invention will be described.

First, referring to FIG. 1 , FIG. 1 is a diagram schematically showing the overall configuration of an apparatus 10 for measuring a state of a rechargeable battery according to an embodiment of the present invention.

As shown in FIG. 1 , the apparatus 10 for measuring the state of a rechargeable battery according to an embodiment of the present invention is largely divided into a voltage measuring unit 12 comprising a voltage comparison circuit for measuring the voltage of the battery 11 . ), a charging current measuring unit 13 including a charging current sensor for measuring the charging current, a discharging current measuring unit 14 including a discharging current sensor for measuring the discharging current, and the battery 11 ), the charging unit 15 including a charging circuit for charging, the discharging unit 16 including a load for discharging the battery 11, and the above-mentioned each unit and the overall operation of the measuring device 10 It may be configured to include a control unit 17 comprising a microcontroller (MCU) for controlling.

In addition, referring to FIG. 2 , FIG. 2 schematically shows a specific configuration of the voltage measuring unit 12 and the controlling unit 17 of the rechargeable battery state measuring device 10 according to the embodiment of the present invention shown in FIG. 1 , respectively. It is a drawing showing

As shown in FIG. 2 , the voltage measuring unit 12 includes a voltage multiplier amplifier 21 for reducing the measured voltage (V _B ) of the battery 11 by a predetermined multiple, and the battery 11 reduced by a predetermined multiple. The voltage comparison amplifier 22 for amplifying the difference between the voltage V _B ' and the reference voltage V _R and the reference voltage generator 23 for generating the above-described reference voltage V _R under the control of the control unit 17 . ) may be included.

More specifically, referring to FIGS. 3 and 4 , FIG. 3 is a diagram schematically showing a specific configuration of the voltage multiplier amplifier 21 shown in FIG. 2 , and FIG. 4 is a voltage comparison amplifier 22 shown in FIG. 2 . It is a diagram schematically showing a specific configuration of each.

Here, the specific configuration and operation of the amplification circuit using the operational amplifier as shown in FIGS. 3 and 4 are obvious to those skilled in the art. Therefore, in the present invention, in order to simplify the description, as described above, those skilled in the art It should be noted that detailed descriptions of contents that can be easily understood and implemented by referring to prior art documents have been omitted.

In addition, as shown in FIG. 2, the control unit 17 includes an AD converter 24 for converting the output signal of the voltage measuring unit 12 into a digital signal, and for removing noise from the converted digital signal. The low-pass filter 25 and the voltage measurement signal from the voltage measurement unit 12 and the charging current and discharge current measurement signals from the charging current measurement unit 13 and the discharge current measurement unit 14 are respectively received, and each A data processing unit 26 configured to perform data processing for calculating various types of information such as a battery charge rate, a health state, and a remaining lifespan based on the measured values and a control processing for controlling the overall operation of the measurement device 10; In order to calculate each of the above-mentioned information, a database for charging and discharging characteristics of each type of battery is built in advance and stored, and data storage comprising a data storage means such as a memory for storing each measured value and calculated value. It may be configured to include the unit 27, and preferably, each of the above units may be configured in the form of a microcontroller (MCU) formed of a single chip.

That is, the control unit 17 of the apparatus 10 for measuring the state of a rechargeable battery according to an embodiment of the present invention includes the charging and discharging voltage (unit: V) and the charging and discharging current (unit: By measuring A), a database for charging and discharging characteristics for each battery type is built and stored in the above-described data storage unit 27, and based on the contents of the database and each measurement value, The processing for calculating the filling rate, the health state, and the remaining life may be configured to be performed through the data processing unit 26 .

More specifically, if the charging voltage at the charging time t ₁ is V ₁ , and the charging voltage at the charging time t ₂ is V ₂ , the charging voltage Vc in the section between t ₁ and t ₂ is [ It can be approximated by a linear function as in Equation 1].

[Equation 1]

Here, in the above [Equation 1], the time variable t is substituted with a new variable x for convenience of calculation, and in the same way, the charging current at the charging time t ₁ is I ₁ , the charging current at the charging time t ₂ . If the charging current is I ₂ , the charging current Ic in the section between t ₁ and t ₂ can be approximated by a linear function as shown in Equation 2 below.

[Equation 2]

In addition, the charging power (Pc) supplied to the battery from the time t ₁ to the time t ₂ from the charging voltage (Vc) and the charging current (Ic) obtained as described above can be expressed as in the following [Equation 3] have.

[Equation 3]

At this time, the energy (W _1,2 ) supplied to the battery between times t ₁ and t ₂ is obtained as in [Equation 4] below.

[Equation 4]

In addition, the total energy W _t supplied to the battery is the sum of the charging energy (W _i,i+1 ) obtained in each measurement section between the complete discharge time t ₀ and the full charge time t _n as in [Equation 5] below. can be saved by

[Equation 5]

Therefore, the filling factor [SoC(ti)] at time t _i can be obtained using the following [Equation 6].

[Equation 6]

The data of the charging voltage Vci, the charging energy W(t _i ), and the charging rate SoC(ti) at each measurement time t _i can be constructed in the same way as described above. Using these data and linear interpolation, the charging rate (SoC) The charging voltage Vc, the charging energy Jc, and the charging time tc according to each can be calculated.

That is, referring to FIGS. 5 and 6 , FIG. 5 is a table showing the measurement results for the charging characteristics of the battery, and FIG. 6 is a table showing the measurement results for the charging voltage, charging energy, and charging time according to the charging rate. It is a schematic drawing.

Here, FIG. 5 shows the results of measuring the charging characteristics according to the charging current of a lithium iron phosphate (LiFePO4; LFP) battery rated at 24V 3.3Ah, and FIG. 6 is a lithium iron phosphate battery rated at 24V 3.3Ah at 7.2A. It shows the result of calculating the charging characteristics at the time of charging, and in the case of a charging rate not listed in the table, it may be configured to calculate the charging voltage, charging energy, and charging time at any charging rate using a linear interpolation method.

More specifically, the result shown in FIG. 6 is a result of calculating the charging characteristics when charging a lithium iron phosphate battery with a rating of 24V 3.3Ah at 7.2A, and as shown in FIG. Since the battery charge voltage changes only 1.05V from 27.50V to 28.59V, accurate and precise battery voltage measurement is required to accurately measure the battery charge rate.

In addition, referring to Figs. 7 and 8, Figs. 7 and 8 are diagrams showing the results of measuring the discharge characteristics of the battery in the same manner as in the method for measuring the charging characteristics as described above. It is a diagram showing the measurement results for the discharge characteristics in a table, and FIG. 8 is a diagram showing the measurement results for the discharge voltage, the discharge energy, and the discharge time according to the charge rate, respectively.

As shown in FIG. 8 , the discharge voltage decreased from 25.29V to 23.66V while the charging rate was decreased from 90% to 10%, indicating a change of 1.63V, and when discharging occurs simultaneously with charging, the battery terminal voltage is the charging voltage The over-discharge voltage is the same.

Accordingly, the charging energy Wc can be obtained from the measured battery voltage and the measured battery charging current in the same manner as described above, and the discharging energy Wd can be obtained from the measured battery voltage and the measured battery discharging current.

That is, as shown in [Equation 7] below, the charging rate SoC can be obtained using the initial charging rate SoC _i and the total energy rating W _t that can be stored in the battery.

[Equation 7]

Here, when the battery is neither charged nor discharged, it is technically difficult to accurately obtain the charge rate from the open terminal voltage Voc of the battery due to hysteresis of the battery.

In addition, after charging the battery, the open-end voltage of the battery decreases with time to reach the final value, that is, the charging voltage curve when continuously charging from 0% charging rate to 100% charging rate is used as the reference charging voltage When referring to the curve, when charging starts at an arbitrary charge rate state (eg 40%), a certain period of time (eg, 1 minute to 2 minutes, hereinafter referred to as “charge transient time”) has elapsed to reach this reference charging voltage curve. Should be.

Accordingly, in the embodiment of the present invention, the charging transient time according to the predetermined charging current is measured in advance and stored in the memory, and when the battery is in an unused state, the battery is preset by the charging transient time to measure the charging rate. It may be configured to calculate a battery charge rate by measuring a battery charging voltage after charging with a charging current.

In addition, the state of health (SOH) and residual cycle (Remnant Cycles) of the battery can be measured by comparing the maximum amount of energy that can be discharged from the current battery with the rated discharge energy of the new battery.

That is, the health state of the battery is calculated by measuring the total discharge energy in the process of discharging the battery from a state in which the battery is charged at a charge rate of 100% until the charge rate becomes 0%. It is expressed in depth of discharge (DoD).

For example, when the current battery health state is 80%, it means that the current battery can only discharge 80% of the rated discharge energy, and the remaining life of the battery is when the battery's degree of discharge (DoD) is 50%. It is expressed as the number of possible charge-discharge cycles from now on.

More specifically, the number of cycles in the 100% to 50% discharge degree can be approximated by a logarithmic function of the discharge degree, that is, as shown in [Equation 8] below, the number of cycles N of the battery is Discharge can also be expressed as a function of DoD (%).

[Equation 8]

Here, in [Equation 8], N ₁ and N ₀ are constants determined according to the characteristics of the battery, and may be configured to use values calculated in advance and stored in a database.

From the above, using the information provided by the manufacturer, the number of cycles of the battery is expressed as a function of the degree of discharge DoD (%), and after storing it in the memory, the current cycle number and DoD are 50%. It may be configured to calculate the difference in the number of cycles as the remaining life.

Therefore, as described above, the charging voltage, charging current, discharging voltage, and discharging current of the battery can be measured, and the battery charge rate, battery health state, and remaining battery life can be calculated from these, and for this purpose, accurate and precise battery voltage measurement is required.

Accordingly, the apparatus 10 for measuring the state of a rechargeable battery according to an embodiment of the present invention is configured to enable accurate and precise voltage measurement using the voltage measuring unit 12 configured as shown in FIG. 2 .

More specifically, as shown in FIG. 2, the voltage terminal of the battery is connected to the voltage multiplier amplifier 21, and at this time, the voltage multiplier amplifier 21 has a very high input impedance (1 MΩ or more), and the withstand voltage is the battery voltage. should have more than one characteristic.

To this end, the voltage multiplier amplifier 21 may be implemented using an amplifier structure as shown in FIG. 3 , and an operational amplifier (OP AMP) may be used as each amplifier in the circuit configuration shown in FIG. 3 .

In addition, when the output voltage V _B ' of the voltage multiplier amplifier 21 configured as described above is the input voltage V _B , the gain G ₁ , and the resistance R ₁ , R ₂ , 9] can be expressed as

[Equation 9]

Here, when the voltage of the reference voltage generator 23 is controlled by 12 bits from 0V to 2.2V, the voltage resolution is 0.537mV, which can generate a sufficiently accurate reference voltage, and the voltage per cell of the rechargeable battery is 1.2V to 4.4V Therefore, the gain G ₁ of the voltage multiplier amplifier 21 may be configured as a reciprocal of twice the number of cells Nc of the battery pack as shown in Equation 10 below.

[Equation 10]

In addition, as shown in FIG. 3, a two-stage low-pass filter composed of R2-C2 is applied to reduce noise introduced to the voltage measured by the voltage multiplier amplifier 21, and at this time, the cut-off frequency fc of the low-pass filter may be expressed as in [Equation 11] below, and an appropriate cut-off frequency fc value may be configured as, for example, 10 Hz.

[Equation 11]

Subsequently, as shown in Fig. 2, the output signal from the voltage multiplier amplifier 21 and the reference voltage from the reference voltage generator 23 are respectively applied to the voltage comparison amplifier 23, and the difference with the reference voltage is amplified. .

More specifically, the voltage comparison amplifier 23 is implemented in the form of a symmetrical differential amplifier as shown in FIG. 4, and may be configured by applying an EMI filter to the input terminal to remove noise.

Here, the gain G ₂ of the voltage comparison amplifier 23 shown in FIG. 4 may be given as in [Equation 12] below, and may be configured as an appropriate gain value, for example, 2 .

[Equation 12]

Next, the output of the voltage comparison amplifier 22 is applied to the AD converter 24 of the control unit 17 to remove noise through the digital low-pass filter 25. For this purpose, the digital low-pass filter 25 is It may be configured to apply filtering in a manner of obtaining an average of N digitally converted voltage values by sampling at regular intervals.

For example, when the output of the voltage comparison amplifier 22 is measured 10,000 times every 1 second and the average is taken, the noise is reduced by about 100 times in the band above 1 Hz, and the output of the low-pass filter 25 is The controller/data processor 26 controls the reference voltage generator 23 to be the minimum (ie, zero) so that the reference voltage V _R equals the multiplied amplified battery voltage V _B ′.

That is, the control unit 17 controls the reference voltage of the reference voltage generator 23 until the output of the voltage comparison amplifier 22 becomes 0, and when the output of the voltage comparison amplifier 22 becomes 0 It may be configured to perform a process of calculating the reference voltage value of the rechargeable battery as a charging voltage or a discharging voltage value of the rechargeable battery.

Therefore, it is possible to measure the battery voltage V _B more accurately and precisely by using the method as described above, thereby using the measured battery voltage, battery charging current, battery discharging current, and battery characteristic data stored in the memory 27 . According to the above method, it is possible to measure the charge rate, the health state, and the remaining life of the battery, respectively.

In addition, although not shown, the apparatus 10 for measuring the state of a rechargeable battery according to an embodiment of the present invention further includes, for example, a separate display means or output means such as LCD or LED, as described above. By outputting various data including each measured value and calculated value measured and calculated as information on the battery state, it can be configured so that the user can easily check information such as the charge rate, health state, and remaining life of the battery. .

Furthermore, although not shown, the apparatus 10 for measuring the state of a rechargeable battery according to an embodiment of the present invention further includes a communication means capable of communicating in at least one of wired or wireless communication, the battery as described above It may be configured to remotely check and manage the battery state by transmitting information on the state, for example, to a user terminal such as a smart phone, tablet PC, or notebook computer, or to an external device such as a server.

As described above, the state measuring apparatus 10 of a rechargeable battery according to an embodiment of the present invention can be implemented, and then, the rechargeable battery using the rechargeable battery state measuring apparatus 10 configured as described above. The detailed contents of the state measurement method will be described.

That is, referring to FIG. 9 , FIG. 9 is a flowchart schematically illustrating an overall configuration of a method for measuring a state of a rechargeable battery according to an embodiment of the present invention.

As shown in FIG. 9 , the method for measuring the state of a rechargeable battery according to an embodiment of the present invention collects measurement data and rating data for charging characteristics and discharging characteristics for various rechargeable batteries and charging the batteries for each type. And a database construction step (S10) in which a process of building a database for the discharge characteristics is performed, and the battery charge rate (State of Charge) based on the measured values of the charging voltage, charging current and discharging current of the battery and data stored in the database The state of health (SOH) of the battery by comparing the charge rate calculation step (S20), in which the process of calculating the SOC) is performed, and the rated discharge energy value stored in the database with the current maximum dischargeable energy of the battery obtained through the measurement ) and the remaining life cycle (Remnant Cycles), the health state and residual life calculation step (S30) in which the processing is performed, and output information on the battery state based on the respective measured values and calculated values through the display means, or It may be configured to include a battery state information providing step (S40) in which a process of providing corresponding information according to a user's request is performed.

Here, the processing of each step may be performed using the apparatus 10 for measuring the state of the rechargeable battery according to the embodiment of the present invention described above with reference to FIGS. 1 to 8 .

More specifically, in the database building step (S10), the charging voltage and the charging voltage when charging from a charging rate of 0% to a charging rate of 100% for various rechargeable batteries using the state measuring device 10 of the rechargeable battery The data on the charging current and the data on the discharge voltage and the discharge current when discharging the battery from 100% of the charge rate to 0% of the charge rate are measured, respectively, and data on the rated discharge energy of the new battery is obtained from the battery manufacturer. It may be configured to construct a database for the charging and discharging characteristics of the and store the data in the data storage unit 27 of the control unit 17 to be performed.

In addition, the charging rate calculation step (S20) is performed by the hysteresis of the battery through the voltage measuring unit 12 to which the analog feedback and digital voltage control method of the state measuring device 10 of the rechargeable battery are applied. To eliminate the charging rate measurement error, the charging voltage of the battery is measured while charging the battery during the charging transient time (approximately 1 to 2 minutes), the measured value is compared with the data stored in the database, and linear interpolation is applied to the charging rate at the time It may be configured such that the processing of calculating and storing in the data storage unit 27 is performed through the control unit 17 of the above-described apparatus 10 for measuring the state of the rechargeable battery.

At this time, when the battery is charging, discharging, or charging and discharging at the same time, the battery voltage, the battery charging current, and the battery discharging current are periodically measured and the energy supplied to the battery is calculated therefrom. It may be configured to calculate a changing charging rate by reflecting the energy charged additionally to the initial charging rate.

In addition, the health state and remaining life calculation step (S30), the voltage measuring unit 12, the charging current measuring unit 13, and the discharging current measuring unit 14 of the state measuring device 10 of the rechargeable battery A process of calculating the health state and remaining life of the battery by comparing the current maximum discharging energy calculated based on the measured values measured through the rated discharge energy value stored in the database and storing it in the data storage unit 27, respectively may be configured to be performed through the control unit 17 of the apparatus 10 for measuring the state of the rechargeable battery.

Furthermore, in the battery state information providing step ( S40 ), each of the measured values and calculated values obtained as described above is output as information on the battery state through a separate display means, or a user terminal or server It may be configured to perform a process for transmitting to an external device, such as.

Accordingly, as described above, the apparatus for measuring the state of a rechargeable battery and the method for measuring the state of a rechargeable battery using the same according to the embodiment of the present invention can be implemented, and thereby, according to the present invention, the charging current sensor, the discharging current sensor, and the voltage State of charge (SOC) at the time of battery use using a measurement circuit and a microcontroller (MCU) and a state measuring device for rechargeable batteries configured to precisely measure changes in the charge rate after the start of use and using the same By providing a method for measuring the state of a rechargeable battery, for example, when the battery is charged without discharging, when only discharging without charging, when discharging simultaneously with charging, when neither charging nor discharging, etc. , it is possible to accurately measure the initial charging rate of the battery and the charging rate varying with the passage of time for various cases.

In addition, according to the present invention, there is provided an apparatus for measuring the state of a rechargeable battery and a method for measuring the state of a rechargeable battery using the same, which are configured to accurately grasp the charging rate and state of the battery that varies with time in various cases as described above. , In general, in the case of a rechargeable battery, it is recommended to discharge 10 to 20% of the battery's energy capacity when in use and charge it at a charge rate of 10 to 20% to 80 to 90% of the charge rate when charging, in terms of extending battery life and saving charging time. However, for various cases such as charging, discharging, discharging at the same time as charging, non-charging and non-discharging of the battery, a method for accurately identifying the charging rate and state of the battery that varies with time is not provided. Therefore, it is possible to solve the problems of the rechargeable batteries of the prior art, which had a limit in which the charging of the battery could not be controlled in various ways.

In addition, according to the present invention, in addition to being able to accurately measure the charging rate and state of the battery that varies with time in various cases as described above, the current maximum energy that can be discharged and the rated discharge energy value of the battery are compared to improve the health of the battery. By providing a state measuring device for a rechargeable battery and a method for measuring the state of a rechargeable battery using the same, which are configured to accurately predict the State of Health (SOH) and Remnant Cycles, when starting to use the battery, charging the battery, It is possible to provide comprehensive information about the overall state of the battery by accurately measuring the health state and remaining life of the battery as well as the charge rate of the battery in various cases such as discharging and discharging at the same time as discharging and charging, and not using the battery.

As described above, the detailed content of the apparatus for measuring the state of a rechargeable battery and the method for measuring the state of a rechargeable battery using the same according to the present invention have been described through the embodiments of the present invention as described above, but the present invention relates to the contents described in the above embodiments Therefore, the present invention is that various modifications, changes, combinations and substitutions are possible according to design needs and other various factors by those of ordinary skill in the art to which the present invention pertains. I'd say it's normal.

10. Rechargeable battery status measurement device
11. Battery 12. Voltage measuring unit
13. Charging current measuring unit 14. Discharging current measuring unit
15. Charging part 16. Discharging part
17. Control unit 21. Voltage multiplier amplifier
22. Voltage Comparison Amplifier 23. Reference Voltage Generator
24. AD converter 25. Low pass filter
26. Data processing unit 27. Data storage unit

Claims (14)

In the state measuring device of a rechargeable battery,
a voltage measuring unit for measuring the voltage of the rechargeable battery;
a charging current measuring unit including a charging current sensor for measuring the charging current of the rechargeable battery;
a discharge current measuring unit including a discharge current sensor for measuring a discharge current of the rechargeable battery;
a charging unit including a charging circuit for charging the rechargeable battery;
a discharging unit including a load for discharging the rechargeable battery; and
Controls the overall operation of the measuring device, and based on the measured values for the charging voltage, charging current, discharging voltage, and discharging current of the rechargeable battery, the state of charge (SOC) of the rechargeable battery, the state of health (State of and a control unit configured to perform a process of calculating and outputting information on the state of the rechargeable battery including Health (SOH) and Remnant Cycles.
The method of claim 1,
The voltage measuring unit,
a reference voltage generator for generating a predetermined reference voltage under the control of the controller;
a voltage multiplier amplifier for reducing the measured voltage of the rechargeable battery by a predetermined constant multiple; and
and a voltage comparison amplifier for amplifying the difference between the voltage of the rechargeable battery and the reference voltage by inputting the voltage reduced through the voltage multiplier amplifier and the reference voltage generated through the reference voltage generator, respectively A device for measuring the state of a rechargeable battery.
3. The method of claim 2,
The voltage multiplier amplifier,
An apparatus for measuring the state of a rechargeable battery, comprising an amplifier circuit including a plurality of operational amplifiers (OP AMP) and a low-pass filter (LPF) for reducing noise.
3. The method of claim 2,
The voltage comparison amplifier,
A state measuring apparatus for a rechargeable battery, characterized in that it is configured in the form of a symmetrical differential amplifier including a plurality of operational amplifiers (OP AMP) and an EMI filter provided at an input terminal to remove noise.
The method of claim 1,
The control unit is
an AD converter for converting a charging voltage measuring signal and a discharging voltage measuring signal of the rechargeable battery received from the voltage measuring unit into a digital signal;
a low-pass filter for removing noise from the digital signal converted through the AD converter;
Measured values for charging voltage, discharging voltage, charging current, discharging current, charging time and discharging time according to the time and charging rate measured for each type of rechargeable battery, and data on the rated characteristics predetermined for each rechargeable battery A battery characteristic information database constructed by collecting each type of each rechargeable battery and storing it in a database form is stored in advance, and includes a data storage means for storing various data including each measured value and calculated value A data storage unit made by; and
Receive the charging voltage measurement signal and the discharge voltage measurement signal from which noise is removed through the low-pass filter, the charging current measurement signal from the charging current measurement unit, and the discharge current measurement signal from the discharge current measurement unit, respectively, , based on each measurement value and data stored in the battery characteristic information database, the initial charge rate (SOC) of the rechargeable battery, the cumulative charge rate (SOC) in the charged or discharged state, the state of health (SOH) and the remaining lifespan and a data processing unit configured to perform data processing for respectively calculating , and control processing for controlling the overall operation of the measuring device, respectively.
6. The method of claim 5,
The control unit is
Control the reference voltage of the reference voltage generator until the output of the voltage comparison amplifier becomes 0, and calculate the value of the reference voltage when the output of the voltage comparison amplifier becomes 0 as the voltage value of the rechargeable battery, The apparatus for measuring the state of a rechargeable battery, characterized in that the data storage unit is configured to perform a storage process.
7. The method of claim 6,
The control unit is
When the charging voltage at the charging time t ₁ is V ₁ and the charging voltage at the charging time t ₂ is V ₂ , the charging voltage Vc in the section between t ₁ and t ₂ is calculated using the following equation ,

When the charging current at the charging time t ₁ is I ₁ and the charging current at the charging time t ₂ is I ₂ , the charging current Ic in the section between t ₁ and t ₂ is calculated using the following equation, ,

Calculate the charging power Pc supplied from the calculated charging voltage (Vc) and charging current (Ic) from time t ₁ to time t ₂ using the following equation,

The energy W _1,2 supplied between time t ₁ and time t ₂ is calculated using the following equation,

The charging energy W _i,i+1 in each measurement section between the time of full discharge t0 and the time of full charge tn is calculated using the following equation,

Using the following equation, calculate the initial charge rate SOC(t _i ) at each measurement time t _i for the rechargeable battery,

At each measurement time t _i , the charging voltage Vci, the charging energy W(t _i ), and the charging rate SoC(ti) are calculated, respectively, and the charging voltage, the charging energy and the charging time according to the charging rate are calculated respectively using a linear interpolation method. and calculating information on charging characteristics, calculating information on discharging characteristics in the same manner, respectively, and storing the information in the data storage unit.
8. The method of claim 7,
The control unit is
When discharging is performed simultaneously with charging, the charging energy Wc is calculated from the measured voltage and charging current values, and the discharging energy Wd is calculated from the measured voltage and discharging current values,
When the initial charging rate is SoC _i and the rated total energy that can be stored in the rechargeable battery is Wt, the charging rate SoC is calculated using the following equation and stored in the data storage unit, characterized in that A device for measuring the condition of a rechargeable battery.

9. The method of claim 8,
The control unit is
When the rechargeable battery is in an unused state that is neither charged nor discharged, charging transient time information according to the charging current stored in advance in the battery characteristic information database to prevent an error due to hysteresis of the battery The state measuring device of a rechargeable battery, characterized in that after charging with a predetermined charging current for a corresponding charging transient time based on the above, measuring the charging voltage, calculating the charging rate, and storing the charging rate in the data storage unit.
10. The method of claim 9,
The control unit is
A percentage by comparing the current maximum discharging energy of the rechargeable battery calculated based on the measured values measured by the voltage measuring unit, the charging current measuring unit and the discharging current measuring unit with the rated discharge energy value stored in the database A device for measuring the state of a rechargeable battery, characterized in that it is configured to perform a process of calculating the health state of the rechargeable battery and storing it in the data storage unit by expressing it in a unit Depth of Discharge (DoD (%)) .
11. The method of claim 10,
The control unit is
Using the following equation, the number of charge-discharge cycles (N) of the rechargeable battery is expressed as a function of the degree of discharge (DoD (%)) and stored in the data storage unit, and the current number of cycles of the rechargeable battery and and a process for calculating a difference in the number of cycles when the degree of discharge (DoD) is 50% as a residual life and storing the difference in the data storage unit is performed.

(Here, N ₁ and N ₀ each represent a predetermined constant according to the characteristics of the battery)
The method of claim 1,
The measuring device is
It is configured to further include a separate display means or output means including LCD or LED,
Displaying various data including respective measured values and calculated values as information on the state of the rechargeable battery through the display means or outputting them through the output means is configured to be performed through the control unit A device for measuring the condition of a rechargeable battery.
The method of claim 1,
The measuring device is
It is configured to further include a communication means capable of communicating in at least one of wired or wireless communication,
The process of transmitting information on the state of the rechargeable battery to a user terminal including at least one of a smartphone, a tablet PC, or a notebook computer, or an external device including a server is configured to be performed through the control unit, so that remotely The apparatus for measuring the state of a rechargeable battery, characterized in that it is configured to check and manage the state of the rechargeable battery.
In the method for measuring the state of a rechargeable battery using the apparatus for measuring the state of a rechargeable battery according to any one of claims 1 to 13,
a database construction step in which a process of collecting measurement data and rating data on charging characteristics and discharging characteristics for each type of rechargeable battery and building a database on charging characteristics and discharging characteristics of the rechargeable battery is performed;
a charging rate calculation step in which a process of calculating a charging rate (SOC) of the rechargeable battery is performed based on the measured values of the voltage, charging current and discharging current of the rechargeable battery and data stored in the database;
A health in which a process of calculating the health state (SOH) and the residual life (Remnant Cycles) of the rechargeable battery by comparing the current maximum dischargeable energy of the rechargeable battery obtained through measurement with the rated discharge energy value stored in the database is performed state and remaining life calculation step; and
and a battery state information providing step in which a process of displaying information on the state of the rechargeable battery or providing corresponding information according to a user's request is performed based on each of the measured values and calculated values How to measure the state of a rechargeable battery.

Images