KR20230149792A - Charging station control server and method for estimating state of health of the battery of electric vehicle - Google Patents

Abstract

A method for estimating the age of a charging station control server and electric vehicle battery is disclosed.
The purpose of the present invention is to provide a method by which the electric vehicle charger can estimate the battery age of an electric vehicle to be charged. By using the present invention, the electric vehicle charger charges even if battery age information is not provided from the electric vehicle. It has the effect of estimating the battery age of the target electric vehicle.

Description

Method for estimating the age of charging station control server and electric vehicle battery {CHARGING STATION CONTROL SERVER AND METHOD FOR ESTIMATING STATE OF HEALTH OF THE BATTERY OF ELECTRIC VEHICLE}

The present invention relates to a charging station control server and a method for estimating the age of an electric vehicle battery.

In the case of electric vehicles, especially electric buses, which are generally charged only at garages, sufficient battery remaining capacity (SOC: State of Charge) must be secured before driving. In particular, since electric route buses have a set operation schedule, the length of idle time at the garage after operation and the amount of charging power per unit time that can be charged at the charger must be well understood to ensure sufficient remaining capacity within the limited idle time. Be able to charge as much as possible.

For this purpose, the concept of battery aging (SOH: State of Health) is used when charging the battery of an electric vehicle. In other words, the battery used in an electric vehicle becomes old as it is used, so in the case of an electric vehicle that has been driven for more than a certain period of time (or mileage), the battery is considered to have reached the end of its life due to aging and the battery is replaced.

Meanwhile, throughout the specification, the battery age of a new battery is defined as 100%, and as the battery is used, the battery age is considered to gradually decrease to a value less than 100%.

This battery age is determined for each vehicle by the battery management system (BMS) installed in the electric vehicle. Electric vehicles store information about the level of aging (SOH) of the installed battery. The charger at the charging station may need information on the age of the battery, but currently, electric vehicle manufacturers do not provide information on the age of the battery from the electric vehicle to the charger. Therefore, electric vehicle chargers are unable to obtain information on the battery age of electric vehicles requiring charging even if they want to.

Battery age affects the amount of power that needs to be charged to the vehicle. In other words, as the battery ages, the electric vehicle needs to charge more power to drive the same distance.

In order to solve the problem of electric vehicle charging stations not receiving battery age information from electric vehicles requiring charging, a request has emerged for a method for electric vehicle chargers to independently estimate the battery age of electric vehicles subject to charging.

KR 10-1839141 B

The present invention was conceived in response to the above requests, and its purpose is to provide a method by which an electric vehicle charger can estimate the battery age of an electric vehicle to be charged.

In order to achieve the above purpose, the charging control server according to one aspect includes a battery rated capacity acquisition unit, a charging voltage control unit, a power consumption measurement unit, a current consumption calculation unit, a current consumption storage unit, a battery aging storage unit, and an operation unit. a battery rated capacity acquisition unit that includes a recording storage unit, a relative power ratio measurement unit, a charging power storage unit, and a communication interface unit, and acquires information on the rated power amount of the battery to be charged installed in the electric vehicle to be charged; a charging voltage control unit that controls the magnitude of the charging voltage applied to the electric vehicle connected to the charger and calculates the average of the applied charging voltage; a power consumption measurement unit that measures the amount of charging power supplied to the electric vehicle; a current consumption calculator that calculates the amount of current used while charging the electric vehicle using the average voltage and the amount of charging power; a current consumption storage unit that stores the amount of current consumption during charging calculated by the current consumption calculation unit; a battery aging storage unit that stores the estimated aging of the battery of the electric vehicle; a driving record storage unit that stores information regarding the operation of the electric vehicle; A relative fuel ratio measuring unit that measures the relative fuel efficiency of the electric vehicle; a charging power storage unit that stores power consumption information when charging the electric vehicle; and a communication interface unit connected to at least one charger to perform data communication; Includes.

At this time, the current consumption calculation unit may calculate the amount of current consumption during charging by dividing the amount of power consumption during charging by the average voltage applied during charging.

Additionally, the current consumption calculation unit may further obtain the amount of current consumption per unit of remaining capacity by dividing the amount of current consumption during charging by the remaining capacity increased through charging.

In addition, the battery aging storage unit may calculate and store the current estimated aging as a percentage value obtained by dividing the current consumption per unit of remaining capacity during current charging by the current consumption per unit of remaining capacity during initial charging.

Additionally, the relative fuel efficiency measuring unit may measure the relative fuel efficiency by dividing the driving distance after the previous charge stored in the driving record storage unit by the amount of change in remaining capacity after the previous charge.

A battery aging estimation method according to another aspect of the present invention includes the steps of checking the amount of current consumption per unit capacity when the battery to be charged is first charged (S10), and the steps of checking the current amount of current consumption per unit capacity of the battery to be charged (S20). ); and calculating the current estimated degree of deterioration (S30).

At this time, the step (S10) includes obtaining battery rated capacity information (S110); Performing initial battery charging (S120); Measuring the average voltage upon initial charging (S130); Measuring the amount of power consumed during initial charging (S140); And it may further include calculating the amount of current consumed during initial charging (S150).

Additionally, in step S150, the amount of current consumed during charging can be obtained by dividing the amount of power consumed during charging by the average voltage applied during charging.

In addition, in step S150, the amount of current consumed per unit of remaining capacity can be further obtained by dividing the amount of current consumed during charging by the remaining capacity increased through charging.

In addition, the step (S20) includes performing battery charging (S220); Measuring the average voltage during current charging (S230); Measuring the amount of power consumed during current charging (S240); And it may further include calculating the amount of current consumed during current charging (S250).

Additionally, in step S250, the amount of current consumed during charging can be obtained by dividing the amount of power consumed during charging by the average voltage applied during charging.

In addition, in step S250, the amount of current consumed per unit of remaining capacity can be further obtained by dividing the amount of current consumed during charging by the remaining capacity increased through charging.

Using the present invention, there is an effect that the electric vehicle charger can estimate the battery age of the electric vehicle to be charged even if battery age information is not provided from the electric vehicle.

Figure 1 is a diagram illustrating the connection between an electric vehicle charging station, an electric vehicle being charged, and a related external server.
Figure 2 is a block diagram showing an example of a charging station control server in which the method for estimating the battery age of an electric vehicle and the method for calculating the optimal charging power amount according to the present invention are implemented;
Figure 3 is a flowchart showing an example of a method for estimating the battery age of an electric vehicle;
Figure 4 is a flow chart showing step (S10) of Figure 3 in more detail;
FIG. 5 is a flowchart showing step S20 of FIG. 3 in more detail.

Hereinafter, the method for estimating the battery age of an electric vehicle according to the present invention will be described in detail with reference to the drawings.

Figure 1 is a diagram illustrating the connection between an electric vehicle charging station, an electric vehicle being charged, and a related external server.

As shown in Figure 1, the electric vehicle charging station 1 is a charging station control server 10, at least one charger 11, and communication data is exchanged between the charging station control server 10 and the at least one charger 11. It includes a network (12).

One charger 11 performs battery charging for one electric vehicle 2. At this time, a communication line is connected between the charger 11 and the electric vehicle 2 to receive necessary data from the vehicle for charging the battery or to transmit necessary data to the vehicle. As a communication line, for example, wired communication according to the CAN protocol and/or wireless communication according to the RFID protocol may be used. Additionally, the charger 11 supplies charging power to the electric vehicle 2 based on a charging schedule controlled by the charging station control server 10.

Meanwhile, the charging station control server 10 is further connected to the transportation company manager server 3 or the operation-related government office server 4 through another communication network. The most important thing in an electric vehicle charging station (1) includes information on costs and sales, such as electricity rate information according to charging power usage and charging information based on charging performance for electric vehicles.

For example, information exchanged with the transportation company manager server 3 may include data fields as shown in the table below.

Data field name Description of data fields CHARGER_ID Charger ID OUTLET_ID Charge gun ID CARD_NUM Membership card number DB_ID DB ID MODE Charger operating mode STATUS charger status STATUS_CODE charger status code batteryStatus battery status startSoc Startup SOC socRate Termination SOC batteryCapacity battery capacitor batteryQnty Battery power usage batteryVoltage battery power chargingQnty power usage chargingPrice Charge amount batteryTemper battery temperature BMS_VERSION BMS version estimateEnd Estimated charging end date and time remaining
(hh mm) chargingTime Power supply period (hh mm ss) chargerCompleteStatus Charging complete status starttime Charging start time Endtime Charging end time Rotate Monitoring batch rotation value Posx Monitoring coordinates Posy Monitoring coordinate Y Color Monitoring Status Color queue_num Waiting turn number chargerVoltage charger voltage chargerAmpere charger current

Figure 2 is a block diagram showing an example of a charging station control server in which the method for estimating the battery age of an electric vehicle and the method for calculating the optimal charging power amount according to the present invention are implemented.

As shown in FIG. 2, the charging station control server 10 according to an example includes a battery rated capacity acquisition unit 100, a charging voltage control unit 110, a power consumption measurement unit 120, a current consumption calculation unit 130, Including a current consumption storage unit 140, a battery aging storage unit 150, a driving record storage unit 160, a relative power ratio measurement unit 170, a charging power storage unit 180, and a communication interface unit 190. It comes true.

The battery rated capacity acquisition unit 100 acquires information on the rated power amount of the battery to be charged installed in the electric vehicle to be charged.

Information on the rated power of the battery can be obtained directly from the electric vehicle 2 connected to the charger 11 for charging. Alternatively, vehicle model information of the electric vehicle 2 may be obtained from the electric vehicle 2, and battery information for each vehicle type stored in the driving record storage unit 160 of the charging station control server 10 (including information on the rated power of the battery) may be retrieved from the electric vehicle 2. Information on the rated power of the battery can also be obtained by reference.

The charging voltage control unit 110 controls the magnitude of the charging voltage applied to the electric vehicle 2 connected to the charger 11. Additionally, the charging voltage control unit 110 may obtain the average voltage of the charging voltage applied to the electric vehicle 2 for a certain period of time.

The power consumption measurement unit 120 measures the amount of charging power supplied to the electric vehicle 2. For this purpose, information on the charging start time, charging end time, and charging time is used, and information on the size of the measured charging power is recorded in the charging power storage unit 180.

The current consumption calculation unit 130 is used while charging the electric vehicle 2 using the voltage value measured by the charging voltage control unit 110 and the magnitude of the charging power amount measured by the power consumption measuring unit 120. Calculate the current amount.

The average of the charging voltage from the time (t ₁ ) applied to the electric vehicle 2 in the charging voltage control unit 110 to the time (t ₂ ) is called V _avg (t ₁ , t ₂ ) (unit: V (Volt)) If the size of the charging power from the time (t ₁ ) measured by the power consumption measurement unit 120 to the time (t ₂ ) is P(t ₁ ,t ₂ ) (unit: Wh (Watt-hour)) , the current consumption amount I(t ₁ , t ₂ ) (unit: Ah (Ampere-hour)) calculated by the current consumption calculation unit 130 can be expressed as Equation 1.

[Equation 1]

I(t ₁ ,t ₂ ) = P(t ₁ ,t ₂ ) / V _avg (t ₁ ,t ₂ ).

The current consumption storage unit 140 stores the amount of current consumption during charging calculated by the current consumption calculation unit 130.

The battery age storage unit 150 stores the estimated age (Estimated SOH) of the battery of each electric vehicle 2 calculated by the charging station control server 10 according to an example of the present invention. In the present invention, the degree of obsolescence (SOH) information is not received and utilized from each electric vehicle 2. Therefore, unless otherwise stated, all estimated age (Estimated SOH) or age (SOH) mentioned in this specification is the estimated age of the battery of each electric vehicle (2) calculated by the charging station control server (10). You must understand.

The driving record storage unit 160 stores records related to the driving of the electric vehicle 2.

If the electric vehicle 2 is a route bus, the operation record stored in the operation record storage unit 160 includes vehicle number, route number (route name), operation start time after charging, operation end time, operation time, travel distance, and operation. It may include the remaining capacity (SOC) at the start of operation and the remaining capacity (SOC) at the end of operation.

The relative power ratio measuring unit 170 measures the relative power ratio of the electric vehicle 2. Fuel economy is a concept that corresponds to 'fuel efficiency', which refers to the fuel efficiency of internal combustion engine vehicles, and refers to the power efficiency of electric vehicles, and is generally expressed as the driving distance per unit amount of power (km/kWh). However, in the present invention, in order to reveal the characteristics of the invention more clearly, the concept of “relative comparison ratio” is defined in the specification as the driving distance per unit of remaining capacity (km/SOC%).

Therefore, unless otherwise stated, the relative fuel ratio mentioned in this specification should be understood as the drivable distance per unit of remaining capacity (km/SOC%).

Relative power ratio is used for the purpose of calculating the efficient amount of power required for charging a single vehicle, regardless of other vehicles.

When the amount of power consumed in the process of charging the electric vehicle 2 is measured by the power consumption measurement unit 120, the charging power storage unit 180 stores the power consumption information.

The communication interface unit 190 performs data communication with at least one charger 11 connected to the charging station management server 10. In addition, data communication can be performed by being further connected to an external transportation company manager server (3) or a operation-related government office server (4).

Figure 3 is a flowchart showing an example of a method for estimating the battery age of an electric vehicle.

As shown in FIG. 3, the method for estimating the battery age of an electric vehicle includes the steps of checking the amount of current consumed per unit capacity when the battery to be charged is first charged (S10), and the step of checking the amount of current consumed per unit capacity of the current battery to be charged. (S20) and calculating the current estimated degree of deterioration (S30).

In step S10, the amount of current consumed per unit capacity (Ah/SOC%) upon initial charging of the battery installed in the electric vehicle to be charged is confirmed.

For example, if the electric vehicle is a commercial route bus, charging is done at a garage charging station. When a new electric route bus is introduced, the new electric route bus can be considered to have 100% battery aging.

Therefore, when charging a new electric route bus for the first time, it can be seen that charging-related data can be obtained when the battery age is 100%.

For example, during initial charging, the average of the charging voltage from the time (t ₁ ) applied to the electric vehicle 2 by the charging voltage control unit 110 to the time (t ₂ ) is referred to as V _0,avg (t ₁ , t ₂ ). , If the size of the charging power from the time (t ₁ ) measured by the power consumption measurement unit 120 to the time (t ₂ ) is P ₀ (t ₁ , t ₂ ), the current consumption calculation unit 130 calculates The amount of current consumption I ₀ (t ₁ , t ₂ ) can be expressed as Equation 2.

[Equation 2]

I ₀ (t ₁ ,t ₂ ) = P ₀ (t ₁ ,t ₂ ) / V _0,avg (t ₁ ,t ₂ ).

The current consumption storage unit 140 stores the amount of current consumption during charging calculated by the current consumption calculation unit 130.

At this time, if the remaining capacity increased through charging is C ₀ (t ₁ , t ₂ )(SOC%), the current consumption per unit capacity I _0,uint (t ₁ , t ₂ ) can be expressed as Equation 3: there is.

[Equation 3]

I _0,unit (t ₁ ,t ₂ ) = I ₀ (t ₁ ,t ₂ ) / C ₀ (t ₁ ,t ₂ )

= {P ₀ (t ₁ ,t ₂ ) / V _0,avg (t ₁ ,t ₂ ) } / C ₀ (t ₁ ,t ₂ ).

The unit is (Ah/SOC%).

The amount of current consumption per unit capacity during initial charging may be stored in the current consumption amount storage unit 140 of the charging station control server 10. Once stored, the amount of current consumed per unit capacity upon initial charging is used as a standard to determine the degree of aging of the battery when the same electric vehicle is repeatedly driven and the battery ages.

In step S20, the amount of current consumption per current unit capacity of the battery to be charged is checked.

Step S20 is a step of measuring the amount of current consumption per unit capacity at a certain point in time (current time) when the aging of the battery progresses as the electric vehicle is driven.

At the current point in time, the average of the charging voltage from the time (t ₃ ) applied to the electric vehicle 2 by the charging voltage control unit 110 to the time (t ₄ ) is referred to as V _avg (t ₃ , t ₄ ), and the consumption If the size of the charging power from the time (t ₃ ) measured by the power measurement unit 120 to the time (t ₄ ) is P(t ₃ , t ₄ ), then the amount of current consumption calculated by the current consumption calculation unit 130 is P(t 3 , t 4 ). I(t ₃ ,t ₄ ) can be expressed as Equation 4.

[Equation 4]

I(t ₃ ,t ₄ ) = P(t ₃ ,t ₄ ) / V _avg (t ₃ ,t ₄ ).

Likewise, if the remaining capacity increased through charging is C(t ₃ , t ₃ )(SOC%), the current consumption per unit capacity I _unit (t ₃ , t ₄ ) can be expressed as Equation 5.

[Equation 5]

I _unit (t ₁ ,t ₂ ) = I(t ₁ ,t ₂ ) / C(t ₁ ,t ₂ )

= { P(t ₁ ,t ₂ ) / V _avg (t ₁ ,t ₂ ) } / C(t ₁ ,t ₂ ).

The unit is (Ah/SOC%).

In step S30, the current estimated deterioration is calculated.

Since the current consumption per unit capacity at the time of initial charging is stored in the current consumption storage unit 140, the ratio of the current consumption per unit capacity during the current charge to the current consumption per unit capacity at the time of initial charging when the battery is not aged at all. The current estimated degree of deterioration is defined by expressing it as a percentage, and this can be expressed as SOH(t ₁ ,t ₂ ,t ₃ ,t ₄ ) as shown in Equation 6 below.

[Equation 6]

SOH(t ₁ ,t ₂ ,t ₃ ,t ₄ ) = {I _unit (t ₃ ,t ₄ ) / I _0,unit (t ₁ ,t ₂ )} × 100

= [{P(t ₃ ,t ₄ ) / V _avg (t ₃ ,t ₄ )} / {P ₀ (t ₁ ,t ₂ ) / V _0,avg (t ₁ ,t ₂ )}] × 100 ( %).

In addition, if the value of the current _estimated deterioration SOH (t ₁ , t ₂ , t ₃ , t ₄ ) is determined by Equation ₆ , the section ( _t ) can _be obtained using Equation 7 _below .

[Equation 7]

P(t _x ,t _y ) = {SOH(t ₁ ,t ₂ ,t ₃ ,t ₄ ) / 100} × P ₀ (t ₁ ,t ₂ ) (kWh).

In other words, what Equation 7 means is that if the estimated deterioration value decreases as the electric vehicle is driven, the current amount of charging power must be increased compared to the initial charging power amount at the time when the battery's efficiency was at its highest, taking into account the decrease in battery efficiency. will be.

Previously, charging was performed solely based on the battery age value unilaterally provided to the charging station from an electric vehicle requiring battery charging. Therefore, even if the battery aging value provided by the electric vehicle is different from the actual, there is no way to verify this at the charging station, so it is exposed to the risk of explosion or deterioration of battery durability due to overcharging, or, conversely, battery capacity due to undercharging. was exposed to the problem of not being able to sufficiently increase the driving distance due to insufficient use of

In the present invention, through this process, the current battery aging can be estimated directly from the electric vehicle charging station control server 10, thereby improving the efficiency and reliability of battery charging.

FIG. 4 is a flowchart showing step S10 of FIG. 3 in more detail.

As shown in Figure 4, step (S10) includes obtaining battery rated capacity information (S110), performing initial charging of the battery (S120), measuring the average voltage during initial charging (S130), and initial charging. It includes a step of measuring the amount of power consumed during initial charging (S140) and a step of calculating the amount of current consumed during initial charging (S150).

To express the embodiment shown in FIG. 4 in detail, let us assume that charging-related data when a newly introduced electric route bus is first charged at a charging station is identified in the charging station control server 10 as shown in Table 2.

charging station vehicle
number Route name charger
ID Outlet
ID Charging start time Charging end time Charging time Charging power amount
(kWh) Start charging
SOC Charging complete
SOC Suwon Passenger Gyeonggi 70 Bar 1663 13 32 B 2021-02-26
23:41:29 2021-02-27
01:39:45 01:58:15 177.28
23 92

What Table 1 means is that at the Suwon Passenger Charging Station, an electric vehicle called Gyeonggi 70ba 1663 (electric route bus on route 13) charged its battery through the B outlet of the charger (charger ID 32) within the charging station. In addition, charging started at 2021-02-26 23:41:29 and lasted for 1 hour 58 minutes 15 seconds and ended at 01:39:45. At this time, the charging power amount was 177.28 (kWh), and this charging It can be seen that the remaining capacity (SOC) of the battery increased from 23% to 92%.

In step S110, in order to perform initial charging of the electric vehicle, information on the battery rating of the electric vehicle is obtained. The battery rating capacity information of the electric vehicle is transmitted directly from the electric vehicle through RFID, or the model information of the electric vehicle is transmitted through RFID from the electric vehicle and then stored in the driving record storage unit 160 in the charging station control server 10. It can be obtained by comparing it with the battery rating capacity information for each vehicle type.

In step S120, initial charging of the battery is performed by supplying power from the charger to the electric vehicle. When charging a battery, the applied voltage and current amount generally change to ensure power efficiency and safety.

Therefore, in step S130, the average voltage applied to the electric vehicle during initial charging is measured. In order to measure the average voltage, the time between the charging start time and the charging end time is divided into regular time intervals (for example, 1 second) and the voltage at that point is recorded every second to obtain the average voltage applied during the entire charging time. You can. In this embodiment, the average voltage is assumed to be 644.18 (V).

In step S140, the amount of power consumed supplied to the electric vehicle during initial charging is measured. The amount of power consumption can be measured by the power consumption measurement unit 120.

In step S150, the amount of current consumed during initial charging is calculated.

As previously explained in FIG. 3, if the average voltage applied during initial charging and the amount of power consumed at that time are known, the amount of current consumed can be obtained through Equation 1.

The amount of current consumed during initial charging is 177.28 (kWh) * 1000 / 644.18 (V) = 275.20 (Ah).

In step S160, the amount of current consumed per unit capacity is calculated during initial charging.

Referring to Table 1, it can be seen that, under the assumption that the average voltage applied during charging is 664.18 (V), a current consumption of 266.91 (Ah) was needed to increase the remaining capacity by 69% from 23% to 92%. there is. In other words, the current consumption per unit capacity at the time of initial charging I _0,unit is,

I _0,unit = 275.20 (Ah) / (92 - 23)(SOC%) = 3.99 (Ah/SOC%)

It is obtained by

FIG. 5 is a flowchart showing step S20 of FIG. 3 in more detail.

As a result of charging at some point after the electric vehicle shown in Figure 4 continues to operate, the electric vehicle was charged with an amount of power of 221.08 (kWh) at an average voltage of 665.43 (V), and as a result, the remaining capacity was 7 (SOC%). Let’s consider the case where it increases to 95 (SOC%).

At this time, the current consumption I is

I = 221.08 (kWh) * 1000 / 665.43(V) = 332.24 (Ah)

It becomes.

In addition, the current consumption per unit capacity I _unit is,

I _unit = 332.24 / (95-7) = 3.78(Ah/SOC%)

It becomes.

Therefore, by calculating the estimated battery age (SOH) of this electric vehicle using Equation 6,

SOH = (I _unit / I _0,unit ) × 100 = 3.78/3.99 × 100 = 88(%).

In other words, it can be seen that the battery performance has been lowered to 88% compared to the initial state of 100%.

Therefore, according to Equation 7, the battery being charged at this point must be charged with an amount of power equal to 100/88 = 1.14 times that of the initial charge.

Additionally, this can be used to calculate relative combat ratio.

If the driving distance of this electric vehicle stored in the driving record storage unit 160 is 180.5 (km), the remaining capacity of this electric vehicle decreased from 95 (SOC%) to 7 (SOC%) while driving the corresponding distance. means.

As explained earlier, in this specification, the relative fuel efficiency is defined as the driving distance (km/SOC%) that can be driven per unit of remaining capacity, so the relative fuel efficiency is calculated as Equation 8.

[Equation 8]

(Relative comparison) = 180.5 / (95-7) = 2.05 (km/SOC%).

Therefore, when referring to the route information (route distance traveled and the number of times the electric vehicle must be driven for one charge) on which the electric vehicle must be driven after charging from the driving record storage unit 160, it can be calculated with higher accuracy through Equation 6 and Equation 7. The amount of charging power can be obtained.

Claims (12)

Includes battery rated capacity acquisition unit, charging voltage control unit, power consumption measurement unit, current consumption calculation unit, consumption current storage unit, battery aging storage unit, driving record storage unit, relative power ratio measurement unit, charging power storage unit, and communication interface unit. And
a battery rated capacity acquisition unit that acquires information on the rated power of the battery to be charged installed in the electric vehicle to be charged;
a charging voltage control unit that controls the magnitude of the charging voltage applied to the electric vehicle connected to the charger and calculates the average of the applied charging voltage;
a power consumption measurement unit that measures the amount of charging power supplied to the electric vehicle;
a current consumption calculator that calculates the amount of current used while charging the electric vehicle using the average voltage and the amount of charging power;
a current consumption storage unit that stores the amount of current consumption during charging calculated by the current consumption calculation unit;
a battery aging storage unit that stores the estimated aging of the battery of the electric vehicle;
a driving record storage unit that stores information regarding the operation of the electric vehicle;
A relative fuel ratio measuring unit that measures the relative fuel efficiency of the electric vehicle;
a charging power storage unit that stores power consumption information when charging the electric vehicle; and
A communication interface unit connected to at least one charger to perform data communication;
Including a charging control server.
According to paragraph 1,
The charging current consumption calculation unit calculates the amount of current consumption during charging by dividing the amount of power consumption during charging by the average voltage applied during charging.
According to paragraph 2,
The charging station control server wherein the current consumption calculator calculates the amount of current consumed per unit of remaining capacity by dividing the amount of current consumed during charging by the remaining capacity increased through charging.
According to paragraph 3,
The battery aging storage unit is a charging station control server that calculates and stores the current estimated aging as a percentage value obtained by dividing the amount of current consumed per unit of remaining capacity during current charging by the amount of current consumed per unit of remaining capacity during initial charging.
According to paragraph 1,
The relative fuel efficiency measuring unit is a charging station control server that measures the relative fuel efficiency by dividing the driving distance after the previous charge stored in the driving record storage unit by the change in remaining capacity after the previous charge.
Checking the amount of current consumed per unit capacity when the battery to be charged is first charged (S10),
Checking the current consumption per unit capacity of the battery to be charged (S20);
And a step of calculating the current estimated age (S30). Method for estimating battery age. According to clause 6,
In the step (S10),
Obtaining battery rated capacity information (S110);
Performing initial battery charging (S120);
Measuring the average voltage upon initial charging (S130);
Measuring the amount of power consumed during initial charging (S140); and
A method for estimating battery age, further comprising calculating the amount of current consumed during initial charging (S150).
In clause 7,
The step (S150) is a method of estimating battery aging in which the amount of current consumed during charging is obtained by dividing the amount of power consumed during charging by the average voltage applied during charging.
According to clause 8,
The step (S150) is a method of estimating battery aging in which the amount of current consumed per unit of remaining capacity is further obtained by dividing the amount of current consumed during charging by the remaining capacity increased through charging.
According to clause 6,
In the step (S20),
Performing battery charging (S220);
Measuring the average voltage during current charging (S230);
Measuring the amount of power consumed during current charging (S240); and
A method for estimating battery age, further comprising calculating the amount of current consumed during current charging (S250).
In clause 7,
The step (S250) is a method of estimating battery aging in which the amount of current consumed during charging is obtained by dividing the amount of power consumed during charging by the average voltage applied during charging.
According to clause 11,
The step (S250) is a method of estimating battery aging in which the amount of current consumed during charging is divided by the remaining capacity increased through charging to further obtain the amount of current consumed per unit of remaining capacity.