KR101373150B1 - Apparatus for estimating soh of battery for vehicle and method thereof - Google Patents

Abstract

An apparatus and method for predicting life of a vehicle battery are disclosed. The present invention can determine whether to replace the battery from the internal resistance of the battery, and if it is determined that the battery is replaced, it is possible to accurately calculate the life of the battery even when the battery is replaced by initializing the life of the battery. In addition, the present invention can calculate the compensation coefficient according to the degree of battery aging using the internal resistance of the battery, it is possible to calculate the life of the battery more accurately by compensating the life consumption according to the compensation coefficient.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for predicting the life of a battery in a vehicle,

The present invention relates to an apparatus and method for predicting the life of a vehicle battery, and more particularly, to determine whether to replace the battery using the internal resistance of the battery, and to accurately calculate the life of the battery by compensating the life consumption according to the degree of battery aging The present invention relates to an apparatus for predicting the life of a vehicle battery and a method thereof.

Recently, hybrid electric vehicles (HEVs) and electric vehicles (EVs) have been developed for the purpose of preventing environmental pollution and replacing limited fluid energy with new energy sources.

In such electric vehicles (EV) and hybrid vehicles (HEV), since the vehicle runs using the electric power of the battery, it is very important to accurately predict the life of the battery (SOH).

In addition, recently introduced vehicles are equipped with a variety of electronic control systems such as an ISG (Idle Stop & Go) system and electric devices, and the demand for use of batteries is gradually increasing.

The ISG system automatically stops the engine when the specific conditions are met after the vehicle stops (Idle Stop) and automatically restarts the engine (Go) when a restart is required by the driver's intention or specific conditions. Means.

Accurate prediction of battery life (SOH) is a very important issue because frequent on / off of start-up state occurs in such ISG system.

Conventionally, a kind of table is prepared by measuring the lifetime consumption amount of the battery according to the state of charge of the battery (SOC), and the amount of change in the remaining charge amount (SOC) is measured every time the charge / discharge cycle is completed .

Then, the lifetime of the battery is calculated in such a manner that the lifetime consumption amount corresponding to the measured remaining charge amount is subtracted from the total lifetime of the battery.

However, the conventional method does not recognize whether the battery is replaced, there is a problem that can not accurately predict the life of the battery when the battery is replaced with a new battery.

In addition, when charging and discharging is performed based on the same remaining charge amount, there is a problem in that the lifespan (SOH) of the battery cannot be accurately predicted because the effect on the battery life varies depending on the degree of aging of the battery.

A related prior art is US Pat. No. 7,554,330 (issued on Jun. 30, 2009, entitled Method for determining deterioration of a battery).

The present invention has been made to improve the above-mentioned problems, the vehicle battery to determine whether to replace the battery using the internal resistance of the battery, and to accurately calculate the life of the battery by compensating the life consumption according to the age of the battery It is an object of the present invention to provide an apparatus and method for predicting the lifespan thereof.

According to an aspect of the present invention, there is provided a method of estimating the life of a vehicle battery, comprising: determining whether to replace a battery by using an internal resistance calculated from a voltage and a current of a battery; And calculating the life of the battery by reflecting whether the calculator replaces the battery.

In the present invention, the voltage and current of the battery is characterized in that the measured value of the starting state.

In the determining of whether to replace the battery of the present invention, the operation unit may determine that the battery is replaced when the internal resistance is lower than the previous internal resistance.

In the calculating of the life of the battery of the present invention, the calculating unit may initialize the life of the battery when it is determined that the battery is replaced.

According to another aspect of the present invention, there is provided a method of predicting a lifespan of a vehicle battery, including calculating a lifespan consumption amount corresponding to a change amount of a battery remaining charge amount by a calculation unit; Calculating a compensation coefficient reflecting a degree of deterioration of the battery based on an internal resistance calculated from the voltage and current of the battery by the calculator; Calculating, by the calculation unit, a compensation consumption amount by reflecting the compensation coefficient in the life consumption amount; And calculating, by the operation unit, a battery life based on the compensation consumption amount.

In the present invention, the compensation coefficient is a value obtained by dividing the internal resistance by a previously calculated average internal resistance.

In the present invention, the compensation consumption is characterized in that the lifetime consumption is a value multiplied by the compensation coefficient.

In the present invention, the battery life is characterized by subtracting the compensation consumption from the life of the previous battery.

The operation unit may further include determining whether to replace the battery using the internal resistance, and the calculation unit may reflect the battery replacement to calculate the life of the battery.

In the present invention, the calculator initializes the life of the battery when the battery is replaced, and calculates the life of the battery based on the compensation consumption when the battery is not replaced.

In accordance with another aspect of the present invention, an apparatus for predicting life of a vehicle battery includes an internal resistance calculator configured to calculate an internal resistance from a current and a voltage of the battery; A replacement determination unit determining whether to replace the battery using the internal resistance; A compensation coefficient calculator configured to calculate a compensation coefficient reflecting a battery age level based on the internal resistance; A life consumption calculator configured to calculate a life consumption corresponding to a change amount of the remaining battery charge; And a life calculator configured to calculate a compensation consumption amount by reflecting the compensation coefficient in the life consumption amount, and calculate a life of the battery based on the compensation consumption amount and whether the battery is replaced.

In the present invention, the replacement determination unit is characterized in that it is determined that the battery is replaced when the internal resistance is lower than the previous internal resistance.

In the present invention, the compensation coefficient calculating unit calculates the compensation coefficient by dividing the internal resistance by a previously calculated average internal resistance.

In the present invention, the life calculation unit may calculate the compensation consumption by multiplying the life consumption by the compensation coefficient.

In the present invention, the life calculator calculates the life of the battery by subtracting the compensation consumption from the life of the previous battery.

According to the present invention, it is possible to accurately calculate the life of the battery even when the battery is replaced by determining whether to replace the battery from the internal resistance of the battery to initialize the battery life.

In addition, according to the present invention, it is possible to calculate the lifespan of the battery more accurately by calculating the compensation coefficient according to the degree of deterioration of the battery using the internal resistance of the battery, and compensating the life consumption according to the compensation coefficient.

1 is a block diagram showing a configuration of an apparatus for predicting the life of a vehicle battery according to an embodiment of the present invention.
FIG. 2 is a graph illustrating a change in internal resistance according to an aged degree of a battery in connection with an apparatus for predicting life of a vehicle battery according to an exemplary embodiment of the present invention.
3 is a graph showing the number of charge and discharge cycles possible with respect to the amount of change in the remaining charge in relation to the life prediction device of the vehicle battery according to an embodiment of the present invention.
FIG. 4 is a graph illustrating life consumption with respect to the amount of change in the remaining charge in relation to the life prediction apparatus for a vehicle battery according to an exemplary embodiment of the present invention.
5 is a flowchart illustrating an operation flow of a method for predicting a life of a vehicle battery according to an embodiment of the present invention.
6 is a flowchart illustrating an operation flow of a method of predicting a life of a vehicle battery according to another embodiment of the present invention.

Hereinafter, an apparatus and method for predicting the life of a vehicle battery according to the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a block diagram illustrating a configuration of an apparatus for predicting life of a vehicle battery according to an exemplary embodiment of the present invention, and FIG. 2 is a degree of deterioration of a battery in relation to an apparatus for predicting life of a vehicle battery according to an embodiment of the present invention. It is a graph showing the change of internal resistance.

3 is a graph showing the number of charge / discharge cycles with respect to the change amount of the remaining charge amount in relation to the life prediction apparatus of the vehicle battery according to an embodiment of the present invention, Figure 4 is a vehicle battery according to an embodiment of the present invention It is a graph showing the life consumption versus the amount of change in the remaining charge in relation to the life prediction device.

As shown in FIG. 1, the apparatus for predicting the life of a vehicle battery according to an exemplary embodiment of the present invention includes a current measuring unit 10, a voltage measuring unit 20, a calculating unit 30, and a memory unit 40. .

The current measuring unit 10 and the voltage measuring unit 20 measure the current and the voltage of the battery (not shown), respectively, and output the measured values to the operation unit 30.

The calculating unit 30 calculates the life of the battery based on the current and voltage of the battery input from the current measuring unit 10 and the voltage measuring unit 20. At this time, the life of the battery can be defined as the remaining life of the battery.

The calculator 30 includes an internal resistance calculator 31, a replacement determiner 32, a compensation coefficient calculator 33, a state of charge calculator 34, a lifetime consumption calculator 35, and a lifetime calculator 36.

The internal resistance calculator 31 calculates the internal resistance of the battery based on the current and voltage of the battery input from the current measuring unit 10 and the voltage measuring unit 20, and replaces the calculated internal resistance with the replacement determination unit 32. And a compensation coefficient calculator 33.

Specifically, the internal resistance calculator 31 performs linear regression analysis using the voltage-current data of the battery, and calculates the slope of the linear first line (that is, the first term coefficient of the regression equation) derived from the linear regression analysis. Can be derived.

In this case, the internal resistance calculator 31 may calculate the internal resistance by using the voltage and current of the battery measured in the startup state.

Here, the starting state means a cranking state in which power is supplied to the engine ignition device (not shown), and the start motor (not shown) forcibly rotates the engine (not shown) do.

On the other hand, the internal resistance calculation unit 31 may calculate the internal resistance using the voltage and current of the battery measured in various other states suitable for the internal resistance calculation, not the starting state.

The replacement determination unit 32 determines whether to replace the battery based on the internal resistance calculated by the internal resistance calculation unit 31.

As shown in FIG. 2, the internal resistance of the battery gradually increases as the use time of the battery increases and the battery ages.

Therefore, the replacement determination unit 32 may determine whether to replace the battery by comparing the current internal resistance calculated by the internal resistance calculation unit 31 with the previous internal resistance stored in the memory unit 40.

That is, the replacement determination unit 32 may determine that the battery is replaced when the current internal resistance is lower than the previous internal resistance, and may determine that the battery is not replaced when the current internal resistance is greater than or equal to the previous internal resistance.

At this time, the replacement determination unit 32 may determine that the battery is replaced when the current internal resistance is lower than the reference value than the previous internal resistance in order to increase the reliability of the determination.

For example, assuming that the previous internal resistance is 30 [mΩ] and the reference value is 5 [mΩ], it may be determined that the battery is replaced when the current internal resistance is lower than 25 [mΩ].

The compensation coefficient calculating unit 33 calculates the compensation coefficient based on the internal resistance of the battery calculated by the internal resistance calculating unit 31. The compensation coefficient is a value reflected in the life consumption to be described later, and means a value for compensating the life consumption according to the age of the battery.

As the battery ages, the lifetime consumption that affects the life of the battery increases, so that the compensation coefficient calculating unit 33 calculates a compensation coefficient based on the battery internal resistance. The compensation coefficient α may be calculated by Equation 1 below.

Here, R _in represents the current internal resistance calculated by the internal resistance calculating unit 31, and R _m represents the average internal resistance with respect to the total battery use time as shown in FIG. 2.

For example, assuming that the average internal resistance (R _m ) is 40 [mΩ], when the current internal resistance is 10 [mΩ], the compensation coefficient is calculated as 0.25 (= 10/40), and the current internal resistance is 60 [ mΩ], the compensation coefficient is calculated as 1.5 (= 60/40).

On the other hand, the average internal resistance (R _m ) is calculated in advance and stored in the memory unit 40, as shown in Equation 2 below, a value obtained by integrating the continuously measured internal resistance (R (t)) over time It can be calculated by dividing by the total usage time (t).

In addition, the average internal resistance (R _m) may be computed by as shown in Equation 3 below, divided by the value sum all of the internal resistance (R _i) the measured discontinuously in total number of measurements (n) value.

The charging state calculator 34 calculates a change amount of the state of charge (SOC) of the battery during the reference time based on the current of the battery input from the current measuring unit 10.

Here, the reference time means a unit time for calculating the life consumption by measuring the amount of change in the remaining charge of the battery, it can be variously defined according to the designer's intention. In this embodiment, the reference time may be defined as a time when one charge / discharge cycle is performed.

That is, the charged state calculating unit 34 calculates the amount of change in the remaining charge amount for each charge cycle or discharge cycle.

In addition, the remaining charge amount represents the current storage capacity as a percentage of the total capacity of the battery, and means the amount of electricity remaining in the battery while the battery is being charged and discharged. That is, the remaining charge amount of 100 [%] indicates a fully charged state, and the remaining charge amount of 0 [%] indicates a completely discharged state.

When the current of the battery is negative, the discharge state is displayed. When the current of the battery is positive, the state of charge is indicated.

If the current of the battery maintains a constant direction, since the state of charge or discharge is kept constant, the state of charge calculation unit 34 calculates the amount of charged or discharged charge by integrating the current of the battery.

Afterwards, when the current direction of the battery is changed, since it is changed from a charged state to a discharged state or changed from a discharged state to a charged state, the charge state calculating unit 34 divides the calculated charge amount by the total capacity of the battery for one charge / discharge cycle. The amount of change in the remaining charge amount during the calculation is calculated.

At this time, when a full charge state (remaining charge amount 100 [%]) is changed from a full discharge state (remaining charge amount 0 [%]) or a full charge state (remaining charge amount 100 [%]) to a full charge state (remaining charge amount 100 [%]). %]) Is calculated as 100 [%].

In addition, when discharge is performed in a state where the remaining charge amount is 70 [%] and the remaining charge amount is changed to a state of 67 [%], the amount of change in the remaining charge amount is calculated as 3 [%].

The life consumption calculation unit 35 calculates a life consumption amount corresponding to the change amount of the remaining charge amount calculated by the state of charge calculation unit 34.

In this case, the lifetime consumption calculator 35 may calculate the lifetime consumption corresponding to the change amount of the remaining charge according to the lifetime consumption table previously stored in the memory 40.

3 is a graph showing the number of charge and discharge cycles possible with respect to the change amount of the remaining charge amount.

Referring to FIG. 3, a charge / discharge cycle having a change amount of remaining charge of 100 [%] may be performed about 200 times on the basis of the same battery, and a charge / discharge cycle having a change amount of 3 [%] of remaining charge amount is about 100,000 times. You can see that it can be done.

That is, even in the same charge / discharge cycle, it can be seen that the influence on the life of the battery is different depending on how much the change in the remaining charge amount during each charge / discharge cycle is performed.

On the other hand, assuming that the overall life of the battery '1' divided by '1' by the Y-axis variable of Figure 3, as shown in Figure 4 it is possible to obtain a graph of the life consumption during one charge and discharge cycle, These coordinates on the graph correspond to the information stored in the above-described life consumption table.

Referring to FIG. 4, when the charge / discharge cycle in which the change amount of the remaining charge amount is 100 [%] is performed once, the life consumption calculation unit 35 calculates the life consumption amount as 0.005, and the change amount of the remaining charge amount is 3 [%]. If the phosphorus charge / discharge cycle is performed once, the lifetime consumption is calculated as 10 ⁻⁵ .

That is, when the amount of change in the remaining charge is performed 100 (%) of charging and discharging cycles when performing one of 0.005 as life is spent, the the charge-discharge cycle variation of 3 [%] of the residual charge once ^{10- 5} lifespan.

The life calculator 36 calculates the life of the battery by reflecting the compensation coefficient calculated by the compensation coefficient calculator 33 to the life consumption input from the life consumption calculator 35.

At this time, the life calculation unit 36 calculates the compensation consumption amount C 'by multiplying the lifetime consumption C by the compensation coefficient α according to Equation 4 below, and according to Equation 5 below, It is possible to calculate the battery life SOH _n by subtracting the compensation consumption C ′ from SOH _{n −1} .

Here, SOH _n represents the remaining life of the battery at the current time when the charge and discharge cycle is performed, SOH _{n -1} represents the remaining life of the battery at the time before the charge and discharge cycle is performed.

For example, when the amount of change in the remaining charge amount during one charge / discharge cycle is 100 [%], the lifetime consumption is calculated as 0.005 as shown in FIG.

At this time, if the average internal resistance is 40 [mΩ] and the current internal resistance is 10 [mΩ], since the compensation coefficient is calculated as 0.25, the compensation consumption is calculated as 0.00125 to be subtracted from the life of the previous battery.

On the other hand, if the current internal resistance is 60 [mΩ], since the compensation coefficient is calculated as 1.5, the compensation consumption is calculated as 0.0075, which is deducted from the life of the previous battery.

As such, reflecting the effect on the life of the battery according to the degree of aging of the battery, it is possible to more accurately predict the life of the battery.

Meanwhile, the life calculator 36 may reflect whether the battery is determined by the replacement determiner 32 in calculating the life of the battery.

If it is determined that the battery is replaced, the life calculator 36 initializes the life of the battery. That is, the life calculator 36 may clear the life SOH _{n −1} of the previous battery and initialize the life SOH of the battery to '1'.

The life of the battery calculated by the life calculator 36 is stored in the memory 40, and the life of the battery stored in this manner is used when calculating the life of the battery after the next charge / discharge cycle is performed.

In addition, the life of the battery calculated by the life calculator 36 may be transferred to various ECUs in the vehicle, including a battery management system (BMS), and used for controlling various vehicles.

The memory 40 stores the internal resistance calculated by the internal resistance calculator 31 and the life of the battery calculated by the lifetime calculator 36. In addition, as described above, the memory unit 40 may store an average internal resistance for calculating a compensation coefficient and a lifetime consumption table for calculating a lifetime consumption.

On the other hand, the life prediction device for a vehicle battery according to an embodiment of the present invention warns the driver that the battery life is short when the life of the battery calculated by the life calculation unit 36 is reduced to less than the minimum required value It may further include an output unit (not shown).

5 is a flowchart illustrating an operation flow of a method for predicting a life of a vehicle battery according to an embodiment of the present invention. Hereinafter, an operation of initializing the battery life by determining whether to replace the battery from the internal resistance will be described in detail.

As shown in FIG. 5, first, the calculator 30 receives a current and a voltage of the battery from the current measuring unit 10 and the voltage measuring unit 20 (S110).

Subsequently, the calculator 30 calculates an internal resistance of the battery based on the current and the voltage of the battery (S120).

At this time, the calculation unit 30 performs a linear regression analysis using the voltage-current data of the battery, and derives the slope of the linear first line (that is, the first term coefficient of the regression equation) as the internal resistance derived from the linear regression analysis. Can be.

In addition, the calculator 30 may calculate the internal resistance by using the voltage and current of the battery measured in the startup state.

Thereafter, the calculator 30 checks whether the calculated current internal resistance is lower than the previous internal resistance (S130).

If the current internal resistance is lower than the previous internal resistance, the new battery may be regarded as being replaced, and the operation unit 30 initializes the life of the battery (S140).

In this case, the calculator 30 may clear the life of the previous battery and reset the life of the current battery to '1'.

On the other hand, if the current internal resistance is greater than the previous internal resistance, since the existing battery is still being used, the calculation unit 30 does not initialize the life of the battery, and calculates the life of the battery in a conventional manner.

In this way, by determining whether or not to replace the battery from the internal resistance of the battery to initialize the life of the battery it is possible to accurately calculate the life of the battery even when the battery is replaced.

6 is a flowchart illustrating an operation flow of a method of predicting a life of a vehicle battery according to another embodiment of the present invention. Hereinafter, an operation of calculating the life of the battery by determining whether to replace the battery using the internal resistance and compensating the life consumption will be described in detail.

As shown in FIG. 6, the calculator 30 receives the current and voltage of the battery from the current measuring unit 10 and the voltage measuring unit 20 (S210).

Subsequently, the calculator 30 calculates the internal resistance of the battery based on the current and the voltage of the battery (S220), and checks whether the calculated current internal resistance is lower than the previous internal resistance (S230).

If the current internal resistance is lower than the previous internal resistance, the new battery may be regarded as being replaced, and the operation unit 30 initializes the life of the battery (S250).

On the other hand, if the current internal resistance is greater than the previous internal resistance, since the existing battery is still being used, the calculation unit 30 calculates the amount of change in the remaining battery charge amount during one charge / discharge cycle based on the current of the battery (S240).

 Subsequently, the calculation unit 30 calculates a life consumption amount corresponding to the change amount of the remaining charge amount by referring to the life consumption amount table stored in the memory unit 40 (S241).

After calculating the lifetime consumption, the calculation unit 30 calculates a compensation coefficient using the internal resistance calculated above (S242).

At this time, the calculation unit 30 may calculate the compensation coefficient by dividing the current internal resistance by the average internal resistance according to Equation 1 described above. The average internal resistance may be previously calculated by Equation 2 or 3 and stored in the memory unit 40.

Thereafter, the calculation unit 30 calculates the compensation consumption amount by reflecting the compensation coefficient in the life consumption amount (S243). In this case, the calculation unit 30 may calculate the compensation consumption by multiplying the lifetime consumption by the compensation coefficient.

Subsequently, the calculator 30 calculates the life of the current battery by subtracting the compensation consumption from the life of the previous battery stored in the memory 40 (S244).

In this way, by using the internal resistance of the battery to calculate the compensation coefficient according to the age of the battery, it is possible to calculate the life of the battery more accurately by compensating the life consumption according to the compensation coefficient.

Meanwhile, in the present exemplary embodiment, the operation of calculating the lifespan consumption first and then calculating the compensation factor has been described as an example.

In other words, it is possible to calculate the lifespan consumption after first calculating the compensation coefficient from the internal resistance, and at the same time, it can be calculated in parallel.

In addition, in the present embodiment, a case of determining whether to replace the battery by using the internal resistance of the battery and compensating the life consumption according to the compensation coefficient based on the internal resistance of the battery has been described as an example.

For reference, instead of the internal resistance of the battery, residual error may be used to compensate for battery replacement and lifespan consumption.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

10: current measuring unit 20: voltage measuring unit
30: calculator 31: internal resistance calculator
32: replacement determination unit 33: compensation coefficient calculation unit
34: charge state calculation unit 35: life consumption calculation unit
36: life calculation unit

Claims (15)

Determining, by the calculator, whether to replace the battery using an internal resistance calculated from the voltage and the current of the battery; And
Comprising a step of calculating the life of the battery by reflecting whether the calculator replaces the battery,
Computing the life of the battery, if it is determined that the battery is not replaced, the operation unit calculates the life consumption corresponding to the amount of change of the remaining battery charge, and the operation unit is calculated from the voltage and current of the battery Calculating a compensation coefficient reflecting the degree of deterioration of the battery based on an internal resistance, calculating the compensation consumption amount by reflecting the compensation coefficient in the life consumption amount, and calculating the compensation consumption amount by using the compensation amount Computing the life of the vehicle life prediction method comprising the step of including.
The method of claim 1, wherein the voltage and current of the battery are measured values of a starting state.
The method of claim 1, wherein determining whether to replace the battery
And the calculating unit determines that the battery is replaced when the internal resistance is lower than a previous internal resistance.
The method of claim 1, wherein the calculating of the life of the battery
And the calculating unit initializes the life of the battery when it is determined that the battery is replaced.
Calculating a lifetime consumption amount corresponding to a change amount of the remaining battery charge amount by the calculation unit;
Calculating a compensation coefficient reflecting a degree of deterioration of the battery based on an internal resistance calculated from the voltage and current of the battery by the calculator;
Calculating, by the calculation unit, a compensation consumption amount by reflecting the compensation coefficient in the life consumption amount; And
And calculating, by the calculating unit, the life of the battery using the compensation consumption amount.
The method of claim 5, wherein the compensation coefficient is a value obtained by dividing the internal resistance by a previously calculated average internal resistance.
7. The method of claim 6, wherein the compensation consumption amount is a value obtained by multiplying the lifetime consumption amount by the compensation coefficient.
The method of claim 5, wherein the life of the battery is a value obtained by subtracting the compensation consumption from the life of a previous battery.
6. The method of claim 5,
The operation unit further comprises the step of determining whether to replace the battery using the internal resistance,
The calculating unit calculates the life of the battery by reflecting whether the battery is replaced or not.
The vehicle battery of claim 9, wherein the calculator initializes the life of the battery when the battery is replaced, and calculates the life of the battery based on the compensation consumption when the battery is not replaced. Life Prediction Method.
An internal resistance calculator configured to calculate an internal resistance from current and voltage of the battery;
A replacement determination unit determining whether to replace the battery using the internal resistance;
A compensation coefficient calculator configured to calculate a compensation coefficient reflecting a battery age level based on the internal resistance;
A life consumption calculator configured to calculate a life consumption corresponding to a change amount of the remaining battery charge; And
And a life calculator configured to calculate a compensation consumption amount by reflecting the compensation coefficient to the life consumption amount, and to calculate the life of the battery based on the compensation consumption amount and whether the battery is replaced.
12. The apparatus of claim 11, wherein the replacement determiner determines that the battery is replaced when the internal resistance is lower than a previous internal resistance.
The apparatus of claim 11, wherein the compensation coefficient calculator calculates the compensation coefficient by dividing the internal resistance by a previously calculated average internal resistance.
The life prediction apparatus of claim 13, wherein the life calculator calculates the compensation consumption by multiplying the life consumption by the compensation coefficient.
The life prediction apparatus of claim 11, wherein the life calculator calculates the life of the battery by subtracting the compensation consumption from the life of a previous battery.

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