JP6183707B2 - Charging system and method for calculating estimated charging end time in charging system - Google Patents

Description

  The present invention relates to a charging system for calculating and displaying an estimated charging completion time for a secondary battery mounted on an electric vehicle such as an electric vehicle and a hybrid vehicle, and a charging completion estimated time calculating method in the charging system.

2. Description of the Related Art In recent years, electric vehicles (including electric vehicles and hybrid vehicles) that obtain all or part of a vehicle driving force with an electric motor have become widespread.
In a driving secondary battery mounted on such an electric vehicle, it is difficult to accurately grasp an SOC (State · Of · Charge) indicating a remaining capacity of the secondary battery as a charging state of the secondary battery. This is very important in that it prevents overcharge and overdischarge of the secondary battery and accurately conveys the remaining capacity of the secondary battery during travel to the passenger.

  In the charging system of an electric vehicle, when charging, the charging rate, the remaining time until the end of charging, and the like are displayed on the monitor of the charger. The displayed remaining time until the end of charging is displayed using the maximum time required for charging calculated by the vehicle side from the remaining battery level and temperature, the maximum output current of the charger, etc. at the start of charging. . The displayed time is the maximum time required for charging on the vehicle side, and is an index time for the charger side to time out and stop charging when charging does not end within this time.

  However, since this display time is displayed as the remaining time until the end of charging, a time longer than the time actually taken at the start of charging is displayed. That is, there is a problem that a deviation occurs between the time when charging is actually completed and the remaining charging time calculated by calculation when starting charging.

Therefore, as a method for calculating the remaining charge time that can accurately calculate the remaining charge time, reflecting the temperature and deterioration state of the battery and the load state during charging, Patent Document 1 discloses that the charge current value decreases during the charge. A method is disclosed in which the remaining charge time is corrected based on the charge current value each time.
However, this remaining charge time calculation method can accurately calculate the remaining charge time, reflecting the battery temperature, deterioration state, and load state during charging. There is a problem that the system becomes complicated.

  In addition, the charging standard has been revised so that the vehicle side can change the display of the “estimated charging end time” item newly set for the “remaining time until charging” displayed on the charger monitor. Therefore, it is desirable to calculate and display the estimated charging end time more reliably and simply.

In view of the above, the applicant of the present invention calculates a proper charging end time with a simple configuration and displays it on the display unit, and a new and improved charging system and a charging end guide in the charging system. In order to realize the time calculation method, a charging system that charges a secondary battery using a charger is proposed.
In such a charging system, the charging end estimated time required for the secondary battery to charge a predetermined amount is calculated based on the output current value of the quick charger and the state information of the secondary battery at the start of charging. Subtract the elapsed time from the beginning of charging to calculate the estimated charging end time based on the actual time, and calculate the SOC count time calculated based on the increase in the SOC of the secondary battery from the beginning of charging from the estimated charging end time. Subtract the calculated charge end time, compare the real time countdown value and the SOC countdown value, and determine the larger value as the secondary battery charge end time. It is displayed as an estimated charging end time.

  As a result, the larger one of the estimated charge end time based on the actual time and the estimated charge end time based on the SOC is displayed as the estimated charge end time. It was possible to reduce the deviation from the remaining charge time calculated in (1).

Japanese Patent No. 3428389 Japanese Patent Application No. 2013-116488 filed on May 31, 2013

As described above, according to Patent Document 2, a new and improved charging system capable of calculating an appropriate charging end time with a simple configuration and displaying the time on the display unit and a charging end guide in the charging system A time calculation method could be provided.
By the way, in such a charging system, if the charging upper limit time is cut at an arbitrary value inside the ECU on the quick charger side or the vehicle side, the remaining charging time remains largely when the charging upper limit time is reached. Problems have been pointed out (see FIG. 8).
The present invention has been proposed in order to improve the above-described problems. When the charging upper limit time is set inside the ECU on the quick charger side or the vehicle side, the charging upper limit is set based on certain conditions. It is an object of the present invention to provide a charging system and a charging end reference time calculating method in the charging system, wherein the calculation is executed by switching to countdown from time.

  In order to solve the above-mentioned problem, the present invention according to claim 1 is a charging system for charging a secondary battery using a charger, wherein the output possible current value of the charger at the start of charging, the state of the secondary battery Based on the information, the scheduled time calculation unit that calculates the charging end scheduled time required for the secondary battery to charge a predetermined amount, and the charging end based on the actual time by subtracting the elapsed time from the charging start time from the charging end scheduled time A real-time countdown calculating unit that calculates a reference time, and an SOC that calculates a charge end reference time by subtracting the SOC count time calculated based on the increase in SOC of the secondary battery from the charge start time from the charge end scheduled time A countdown calculation unit, a charge upper limit time setting unit capable of setting an upper limit charge time, an estimated charge end time by a real time countdown calculation unit, and a charge by an SOC countdown calculation unit Charge the secondary battery by comparing the estimated termination time with the estimated charging end time obtained from the actual time by subtracting the elapsed time from the start of charging from the charging upper limit time set by the charging upper limit time setting unit. It is characterized by comprising a determination unit for determining a reference end time and a display unit for displaying a determination result of the determination unit as a reference charge end time for the secondary battery.

  As a result, when the charging upper limit time is set, the charging end guide time by the real time countdown calculation unit, the charging end guide time by the SOC countdown calculation unit, and the elapsed time from the start of charging are subtracted from the charging upper limit time. Since the target charging end time for the secondary battery is determined by comparing the required charging end estimated time, the actual charging completion time and the remaining charging time calculated when starting the quick charging are determined. Can be reduced.

  Moreover, in this invention of Claim 2, a determination part will compare the charge upper limit time by a charge upper limit time setting part with the charge end estimated time, and if charge upper limit time exceeds the charge end estimated time, Compare the charging end guide time by the real time countdown calculating unit and the SOC countdown calculating unit, determine the larger value as the charging end guide time of the secondary battery, and if the upper limit charging time is less than the scheduled charging end time The charging end reference time obtained based on the actual time by subtracting the elapsed time from the charging start time from the charging upper limit time by the charging upper limit time setting unit is determined as the charging end reference time of the secondary battery .

  Thus, the end of charging by the real time countdown calculating unit, which is obtained based on the scheduled charging end time by comparing the set upper limit charging time with the scheduled charging end time obtained based on the state information of the secondary battery. Since the guide end time of the larger value is adopted from the guide time and the charge end guide time by the SOC countdown calculation part, or the charge end guide time calculated based on the charge upper limit time is adopted, more It can be set as a suitable charge completion reference time.

  In the present invention, the secondary battery is a battery for an electric vehicle, the charging upper limit time setting unit is provided on the charger side or the vehicle side, and the charging upper limit time setting unit is the charger or the vehicle. It is characterized by communicating with.

  Thereby, when charging the battery of the electric vehicle, when the charging upper limit time is set on the charger side or the vehicle side, information on the charging upper limit time can be communicated to the charger side or the vehicle side, The efficiency of the charging system can be improved.

  Further, in the present invention of claim 4, there is provided a method for calculating a charging end time in a charging system in which a secondary battery is charged using a charger, the output possible current value of the charger at the start of charging, Based on the status information, a first step of calculating a charge completion scheduled time required for the secondary battery to charge a predetermined amount, and charging based on real time by subtracting the elapsed time from the charge start time from the charge completion scheduled time A second step of calculating a reference end time and a charge end reference time by subtracting a SOC count time calculated based on an increase in the SOC of the secondary battery from the charge start time from a charge end scheduled time. 3, a fourth step of subtracting the elapsed time from the start of charging from a preset charging upper limit time and calculating a charging end reference time based on the actual time, and a second, third, fourth step Compared each charge termination Estimated time obtained I, characterized by comprising a fifth step of determining charge completion estimated time of the secondary battery, the.

  As a result, a more appropriate charging end guide time is determined by comparing the time when charging is actually completed, the remaining charging time calculated when starting charging, and the set charging upper limit time. It can contribute to easy-to-use charging without any sense of incongruity.

  Further, in the present invention according to claim 5, the fifth step compares the charge upper limit time and the charge end scheduled time, compares the charge upper limit time and the charge end scheduled time by the charge upper limit time setting unit, If the upper limit charging time exceeds the estimated charging end time, compare the estimated charging end time by the real time countdown calculation unit and the SOC countdown calculation unit, and determine the larger value as the estimated charging end time for the secondary battery. If the charging upper limit time is less than the scheduled charging end time, the elapsed time from the start of charging is subtracted from the charging upper limit time set by the charging upper limit time setting unit, and the calculation time based on the actual time is determined as the estimated charging end time. It is characterized by doing.

  As a result, when the upper limit charging time is set, the calculation can be executed by switching between the calculation by the real time countdown and the SOC countdown based on the scheduled charging end time or the countdown from the charging upper limit time.

  According to the present invention, when the charging upper limit time is set, the calculation is executed by switching to the real time countdown and SOC countdown based on the scheduled charging end time or the countdown from the charging upper limit time. Can be mitigated between the time to complete charging and the remaining charge time calculated when the quick charge is started.

1 is a schematic diagram showing an embodiment of a rapid charging system as a charging system according to the present invention. It is a schematic structure figure showing a 1st embodiment of a quick charge system. It is a figure which shows a SOC state change in case charging is performed by the real time countdown based on the charge end scheduled time or the real time countdown based on the charge upper limit time when the charge upper limit time is set. It is a flowchart which shows operation | movement of the quick charge method by the quick charge system which concerns on 1st Embodiment shown in FIG. (A) is a figure which shows the SOC state change of the secondary battery by the charging system which concerns on one Embodiment of this invention, (b) is a figure to the secondary battery by the charging system which concerns on one Embodiment of this invention. It is a figure which shows the time-dependent change of charging current. It is a figure for demonstrating calculation of the charge end standard time by the quick charge system which concerns on 1st Embodiment. It is a schematic block diagram which shows 2nd Embodiment of a quick charge system. It is a figure for demonstrating the problem of the conventional quick charge system.

  Hereinafter, preferred embodiments of the present invention will be described in detail. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are essential as means for solving the present invention. Not necessarily.

First, a charging system according to the present invention will be described with reference to the drawings, taking an embodiment of a quick charging system.
FIG. 1 shows a quick charging system 1.
In the quick charging system 1, a secondary battery (described later) mounted on an electric vehicle 2 such as an electric vehicle or a hybrid vehicle is rapidly charged by a quick charger 3 via a charging cable 3a and a connector 3b. This is a system that calculates the estimated charge completion time by the quick charger 3 and displays the estimated charge completion time as a countdown value.

(First embodiment)
Such a quick charging system 1 can be configured as shown in FIG. 2 as the first embodiment.
Here, the quick charging system 1 includes an ECU 4 and a high voltage battery 5 serving as a secondary battery on the vehicle 2 side, and a display unit 6 and an overall quick charger 3 on the quick charger 3 side. The control part 7 which performs various control, and the electric power supply part 8 which supplies the electric power to a secondary battery are provided.

  The ECU 4 is a control device for performing comprehensive control of the vehicle 2, and includes an input / output device, a storage device (ROM, RAM, nonvolatile RAM, etc.), a central processing unit (CPU), a timer, and the like. Is done. In the present embodiment, as shown in FIG. 2, the ECU 4 includes a scheduled time calculation unit 9, a real time countdown calculation unit 10, an SOC countdown calculation unit 11, a charge upper limit time setting unit 12, and a determination unit 13. Prepare.

The scheduled time calculation unit 9 is required to charge the secondary battery 5 based on at least one of the output possible current value of the quick charger 3, the SOC of the secondary battery 5, the temperature, the characteristics, and the deterioration coefficient at the start of charging. Calculate the estimated charging end time.
Here, the state information of the secondary battery of the present invention corresponds to any of the SOC, temperature, characteristics, and deterioration coefficient of the secondary battery 5. That is, when the quick charge is started, the scheduled time calculation unit 9 calculates the remaining charge time calculated based on the above-described variation factor while predicting it as the expected charge end time required for charging the secondary battery 5. A detailed description of the calculation operation of the scheduled charging end time by the scheduled time calculation unit 9 will be described later.

The real time countdown calculation unit 10 calculates the charge end reference time based on the real time by subtracting the elapsed time from the charge start time from the charge end scheduled time calculated by the scheduled time calculation unit 9. In addition, the real time countdown calculation unit 10 calculates the estimated charge end time based on the real time by subtracting the elapsed time from the charge start time from the charge upper limit time set by the charge upper limit time setting unit 12 described later. To do.
That is, the real time countdown calculation unit 10 calculates an actual time countdown value that simply decreases with time as a charge completion guide time by subtracting the elapsed time from the charge start time from the charge completion scheduled time. That is, the real-time countdown calculation unit 10 calculates the subtracted (countdown) real-time countdown value as the charging end guide time.
In addition, the real time countdown calculation unit 10 subtracts the elapsed time from the charge start time from the charge upper limit time, thereby calculating the real time countdown value that simply decreases with time as the charge end guide time.

  The SOC countdown calculation unit 11 calculates a charge end reference time based on the SOC from the charge end scheduled time calculated by the scheduled time calculation unit 9. That is, the SOC countdown calculation unit 11 subtracts the SOC elapsed time (SOC count time) calculated based on the increase in the SOC of the secondary battery 5 from the start of charging from the scheduled charging end time, thereby An SOC countdown value that does not simply decrease is calculated as a charge completion reference time.

Specifically, the SOC countdown calculation unit 11 equally divides the estimated charging end time by the SOC required for charging until reaching the SOC at the end of charging (at a predetermined charge amount including full charging). Thus, the SOC allocation time is calculated, the SOC allocation time in the current SOC is calculated using the SOC allocation time, the calculated time is subtracted from the estimated charging end time, and the subtracted SOC countdown value is charged. Calculate as a reference time.
The details of the operation for calculating the estimated charging end time by the SOC countdown calculation unit 11 will be described later.

  Here, charging upper limit time setting unit 12 is mounted on ECU 4 in the vehicle, and charging upper limit time setting unit 12 communicates with quick charger 3 to set the charging upper limit time in advance. The charging upper limit time means a charging time that is freely set on the quick charger 3 side, for example, up to a charging time (for example, 60 minutes) required for charging up to 80%.

  The determination unit 13 subtracts the elapsed time from the start of charging from the estimated charging end time by the real time countdown calculating unit 10, the estimated charging end time by the SOC countdown calculating unit 11, and the charging upper limit time by the charging upper limit time setting unit 12. Then, the charging end guide time obtained based on the actual time is compared with each other, and the charging end guide time of the secondary battery is determined by the procedure described later.

  The display unit 6 is provided on the quick charger 3 side, and displays the determination result of the determination unit 13 as a charging completion reference time of the secondary battery 5. That is, the display unit 6 displays the charge completion guide time calculated by the ECU 4 on the vehicle 2 side as the remaining charge time calculated when the quick charge is started.

As a procedure for determining the reference charging end time of the secondary battery 5, based on the charging upper limit time set by the charging upper limit time setting unit 12 and the initial state information of the secondary battery 5 as the charging end reference time. A comparison is made with the calculated estimated charge end time, and a charge completion reference time is determined and displayed according to the comparison result.
That is, the charging upper limit time set by the charging upper limit time setting unit 12 is compared with the estimated charging end time based on the state information of the secondary battery 5, and if the charging upper limit time> the charging end scheduled time, Based on the estimated charging end time based on the state information of the secondary battery 5, the estimated charging end time by the real time countdown calculating unit and the SOC countdown calculating unit is compared, and the larger value is determined as the estimated charging end time of the secondary battery. (See FIG. 3).
The charging upper limit time is compared with the estimated charging end time calculated based on the initial state information of the secondary battery 5 because the estimated charging end time is based on the state information of the secondary battery 5. This is because, even if charging is performed for a charging upper limit time exceeding the scheduled charging end time, the charging time required for charging up to 80% (for example, 60 minutes) is exceeded. Therefore, if the upper limit charging time> the estimated charging end time, the charging end estimated time by the real time countdown calculating unit and the SOC countdown calculating unit is compared based on the estimated charging end time. What is necessary is just to determine to battery charge completion reference time.

On the other hand, if the charging upper limit time <the scheduled charging end time, the determination unit 13 subtracts the elapsed time from the start of charging from the charging upper limit time based on the charging upper limit time set by the charging upper limit time setting unit 12. Is determined as the estimated charge completion time for the secondary battery.
As described above, in this embodiment, the estimated charging end time is calculated based on the charging upper limit time set by the charging upper limit time setting unit 12 and the initial state information of the secondary battery 5 as the charging completion guide time. In accordance with the result of this comparison, the charging end guide time is determined and displayed, so the time between the actual charging completion time and the remaining charge time calculated when starting the quick charging is displayed. Can be reduced.

The display unit 6 displays a calculation result by the real-time countdown calculation unit 10, a calculation result by the SOC countdown calculation unit 11, and a charging upper limit when displaying the estimated charge end time. It is possible to display the calculation result based on the actual time by subtracting the elapsed time from the start of charging from the time in a different manner.
Specifically, for example, when displaying a countdown value based on real time and when displaying a countdown value based on SOC, the blinking number lamp is displayed in a different color, or each countdown value is indicated by an indicator. Or display them at the same time to display them in different modes. Thus, the efficiency of the quick charging system 1 can be improved by clarifying which calculation unit 9, 10 indicates the calculation end result of the display of the charging end reference time on the display unit 6.

  Next, the rapid charging operation by the rapid charging system 1 of the present embodiment will be described based on the flowchart shown in FIG.

First, after confirming that the output possible current value of the quick charger 3 has been received at the start of charging, based on the state information of the secondary battery 5, the estimated charging end time required for the secondary battery 5 to charge a predetermined amount (Initial value) is calculated (first step S1).
When charging the secondary battery 5, as shown in FIG. 5 (a), (b) , it is from the start of charging until the predetermined time t _P1, charging current is a constant current charge of predetermined value I0, Then, it is set as the constant voltage charge from which charging current falls at any time.
That is, at the start of charging, in order to obtain the estimated charging end time, first, the SOC (C1) capable of constant current charging is estimated from the outputable current value of the quick charger 3, the battery temperature, the battery deterioration level, and the like.
Then, based on the estimated constant current possible SOC (C1), the charging start SOC (C0), the charging end SOC (C2), the charging efficiency, the battery deterioration degree, and the constant current charging time (t _P1 ) and the constant voltage charging time ( t _P2 −t _P1 ) is calculated.
Then, by adding the constant current charging time, the constant voltage charging time, and the correction value, the charging end estimated time T0 that is the initial value of the charging end guide time is obtained.

Next, based on the estimated charging end time T0, the actual time countdown calculation unit 10 calculates the estimated charging end time based on the actual time countdown by subtracting the elapsed time from the charging start time from the estimated charging end time T0. The result is T1 (second step S2).
Specifically, the countdown corresponding to the actual time of the scheduled charging end time T0 is executed using the scheduled charging end time T0 calculated at the start of charging. That is, the countdown is executed so as to simply decrease from the scheduled charging end time T0.
For example, when the estimated charging end time is calculated as 30 minutes, as shown in the graph L1 in FIG. 6, the initial value is set to 30 minutes, and the transmission value is updated every minute from the initial value. Execute countdown according to real time. Then, the calculation result T1 is assumed to be a charging completion guide time T1.

In addition to the calculation of the estimated charging end time based on the actual time by the actual time countdown calculating unit 10, the SOC countdown calculating unit 11 increases the SOC of the secondary battery 5 from the charging start time from the estimated charging end time T0. The SOC count time calculated on the basis of this is subtracted to calculate the charge end guide time, and the calculation result is set to T2 (third step S3).
Specifically, the SOC countdown calculation unit 11 calculates the SOC allocation time by equally dividing the estimated charging end time T0 by the SOC required for charging until reaching the SOC at the end of charging, and uses the SOC allocation time. The SOC count time in the SOC is calculated, the SOC count time is subtracted from the scheduled charging end time, the time based on the SOC is calculated, and the calculation result is T2.
That is, the SOC count time in the current SOC is calculated based on the following equation (1).
(SOC count time) = (estimated charge end time) / (charge end SOC−SOC at start of charge) × (current SOC−SOC at start of charge) (1)

  For example, when the estimated charging end time is calculated as 30 minutes based on the predicted SOC time-dependent change value L0 of the secondary battery 5, the SOC count time is subtracted from the countdown value based on the SOC, that is, the estimated charging end time. As shown in a graph L2 in FIG. 6, the value changes so as to be a line object with the rising curve of the SOC temporal change predicted value L0. That is, the SOC countdown value changes with time without monotonously decreasing so that the rate of decrease gradually decreases while initially decreasing rapidly. In other words, as the SOC increases, the time changes without a monotonous decrease such that the time decreases.

  Then, from the charging upper limit time set by the charging upper limit time setting unit 12, the elapsed time from the start of charging is subtracted to calculate the charging end guide time based on the real time countdown, and the calculation result is T3 (first) 4 step S4).

Thereafter, the charging end guide times T1, T2, and T3 calculated in the second step S2, the third step S3, and the fourth step S4 are compared and determined by the determination unit 13, and the determination of the charging end guide time is sequentially performed in the following procedure. Executed.
First, the calculation result T1 of the second step S2 is held as the charge completion guide time T1 (fifth step S5).
Next, the calculation result T2 of the third step S3 is compared with the estimated charging end time T1 (sixth step S6). If T2> the estimated charging end time T1, T2 is updated as the estimated charging end time T2. (Seventh step S7).
Then, the calculation result T3 of the fourth step S4 is compared with the estimated charging end time T2 (eighth step S8). If the estimated charging end time T2> T3, T3 is updated as the estimated charging end time T3. (Eighth step S8).

  As described above, the calculation result T1 obtained in the real time countdown calculation unit 10, the calculation result T2 obtained in the SOC countdown calculation unit 11, and the calculation result T3 in the real time countdown calculation unit 10 based on the charging upper limit time are obtained. The determination unit 13 compares and determines, and the larger value between the calculation result T1 obtained in the real time countdown calculation unit 10 and the calculation result T2 obtained in the SOC countdown calculation unit 11 is used as a charge end reference time. If this larger value is compared with the calculation result T3 in the real time countdown calculation unit 10 based on the charging upper limit time, and T3 is smaller than the larger value, T3 is the estimated charging end time. Can be displayed on the display unit 6 via the control unit 7 of the quick charger 2 (step 10). S10).

  Then, when the charge end reference time counted down from the charge start time and displayed on the display unit 6 is reached, or when a charge stop command is issued from the quick charger 2 side (11th step S11), a series of charge operations On the other hand, if the charging end guide time has not been reached, or if no charge stop command has been issued from the quick charger 2 side, the process returns to the second step S2 and is executed again sequentially.

  Thus, in the present embodiment, the charging start time T1 by the real time countdown calculation unit 10, the charging end guide time T2 by the SOC countdown calculation unit 11, and the charging upper limit time by the charging upper limit time setting unit 12 The final charge completion guide time can be determined from the charge completion guide time T3 obtained by subtracting the elapsed time from.

That is, the charge upper limit time set by the charge upper limit time setting unit 12 is compared with the estimated charge end time. If the upper limit charge time is greater than the expected charge end time, the determination unit 13 determines whether the real time countdown calculation unit and the SOC countdown calculation unit are satisfied. Comparing the estimated charging end time with, the larger value is determined as the estimated charging end time for the secondary battery.
At the start of charging of the secondary battery 5, since the SOC countdown value decreases earlier because of constant current charging, the charging end reference time from the real time countdown calculation unit 10 is displayed on the display unit 6.

  On the other hand, after the charging of the secondary battery 5 has been switched to constant voltage charging, which has progressed to some extent, the SOC countdown value decreases later and becomes larger from the middle, so that the estimated charge termination time from the SOC countdown calculation unit 11 Is displayed on the display unit 6. That is, in this embodiment, after executing two countdowns based on the real time and the SOC, the one with the longer charge completion guide time is output to the display unit 6 of the quick charger 3. For this reason, since the deviation between the time when charging is actually completed and the remaining charging time calculated when starting rapid charging can be reduced, a more appropriate charging end time can be calculated and displayed. .

On the other hand, the charge upper limit time set by the charge upper limit time setting unit 12 is compared with the estimated charge end time. Based on the above, the elapsed time from the start of charging is subtracted from the upper limit charging time, and the estimated charging end time obtained based on the actual time is determined as the estimated charging end time of the secondary battery.
As described above, in this embodiment, the estimated charging end time is calculated based on the charging upper limit time set by the charging upper limit time setting unit 12 and the initial state information of the secondary battery 5 as the charging completion guide time. In accordance with the result of this comparison, the charging end guide time is determined and displayed, so the time between the actual charging completion time and the remaining charge time calculated when starting the quick charging is displayed. Can be reduced.

  Further, in the present embodiment, the charge completion guide time displayed on the display unit 6 can be calculated with simple logic. For this reason, since the logic of the quick charge system of the present embodiment can be incorporated even when the secondary battery is changed or the vehicle type is changed, the design at the time of changing the specifications related to the secondary battery or the vehicle is facilitated. For example, in the future, when the current limit is changed at high temperatures, the time required for review will be reduced, such as the conventional maximum charging time, and when the secondary battery is changed or the vehicle type is changed, This saves you the trouble of continuing charging with the final value clip.

(Second Embodiment)
The first embodiment of the present invention has been described in detail above.
As a second embodiment, it can also be implemented as a rapid charging system 1 shown in FIG. In this case, in 2nd Embodiment, the charge upper limit time setting part 12 can also be provided in the quick charger 3 side, and can communicate with ECU4 in a vehicle. The charging upper limit time setting unit 12 is not provided on the vehicle side as in the first embodiment, but the charging upper limit time is set by communicating with the ECU 4 in the vehicle on the installation contractor side by providing on the quick charger 3 side. Therefore, the charging function according to the standard and specification of the quick charger 3 can be maintained.

  Further, in the above embodiment, the SOC allocation time is a value obtained by equally dividing the estimated charging end time by the SOC that requires charging until reaching the SOC at the end of charging. However, the present invention is not limited to this. Alternatively, a value set by assigning an arbitrary time may be used. For example, the SOC countdown calculation unit uses a predetermined arbitrary time (for example, 5 minutes) as the SOC count time every time the predetermined SOC (for example, 5%) increases after the charging is started, from the estimated charging end time. Subtraction may be performed, and the subtracted value may be calculated as the charge completion guide time. In this case, the time allocated and set for a predetermined SOC is set in advance to an appropriate value obtained from experiments or simulations, and is appropriately changed according to the state of the secondary battery and the charging environment. It may be.

  Moreover, in the said embodiment, although the structure which provided the display part 6 which displays charge completion reference time in a quick charger was shown, it is not restricted to this, You may provide the display part 6 also in a vehicle. The display unit 6 provided in the vehicle also displays the calculation result by the real-time countdown calculation unit 10 and the calculation result by the SOC countdown calculation unit 11 when displaying the charging completion guide time. May be displayed in a different manner. Thereby, the usability to a user can be improved more.

  Moreover, although the example applied to the quick charge system and the quick charge method was shown in the said embodiment, it is not restricted to this, You may apply to a normal charge system and the normal charge method.

  The charging system according to the present invention can be applied as a charging system for any electric vehicle.

DESCRIPTION OF SYMBOLS 1 Quick charge system 2 Electric vehicle 3 Quick charger 4 ECU
DESCRIPTION OF SYMBOLS 5 Secondary battery 6 Display part 7 Control part 8 Electric power supply part 9 Schedule time calculation part 10 Real time countdown calculation part 11 SOC countdown calculation part 12 Charging upper limit time setting part 13 Determination part

Claims (5)

A charging system for charging a secondary battery using a charger,
Based on the output possible current value of the charger at the start of charging and the state information of the secondary battery, a scheduled time calculation unit that calculates a charge completion scheduled time required for the secondary battery to charge a predetermined amount;
A real time countdown calculation unit for subtracting the elapsed time from the charge start time from the charge end scheduled time and calculating a charge end reference time based on the real time;
An SOC countdown calculation unit that calculates a charge end reference time by subtracting an SOC count time calculated based on an increase in SOC of the secondary battery from the charge start time from the charge end scheduled time;
A charge upper limit time setting section capable of setting a charge upper limit time;
Subtract the elapsed time from the start of charging from the charging end guide time by the real time countdown calculating unit, the charging end guide time by the SOC countdown calculating unit, and the charging upper limit time by the charging upper limit time setting unit to obtain the actual time. A determination unit for determining a charge completion guide time of the secondary battery by comparing a charge completion guide time obtained based on
A charging system comprising: a display unit that displays a determination result of the determination unit as an estimated charging end time of the secondary battery.   The determination unit compares the charging upper limit time set by the charging upper limit time setting unit and the scheduled charging end time, and if the charging upper limit time exceeds the scheduled charging end time, the real time countdown calculation unit And the SOC end count calculation time by the SOC countdown calculation unit, the larger value is determined as the charge end guide time of the secondary battery, and if the upper limit charge time is less than the scheduled charge end time, The elapsed time from the start of charging is subtracted from the upper limit charging time set by the upper limit time setting unit, and the estimated charging end time determined based on the actual time is determined as the estimated charging end time of the secondary battery. Item 2. The charging system according to Item 1.   The secondary battery is a battery for an electric vehicle, the charging upper limit time setting unit is provided on the charger side or the vehicle side, and the charging upper limit time setting unit communicates with the charger or the vehicle. The charging system according to claim 1 or 2. A method for calculating a charging end time in a charging system that uses a charger to charge a secondary battery,
A first step of calculating a charge completion scheduled time required for the secondary battery to charge a predetermined amount based on the output possible current value of the charger at the start of charging and the state information of the secondary battery;
A second step of subtracting an elapsed time from the charge start time from the charge end scheduled time to calculate a charge end reference time based on real time;
A third step of calculating an estimated charge end time by subtracting an SOC count time calculated based on an increase in SOC of the secondary battery from the charge start time from the expected charge end time;
A fourth step of subtracting the elapsed time from the charge start time from a preset charge upper limit time to calculate a charge end guide time based on real time;
A fifth step of determining a charging end reference time of the secondary battery by comparing the charging end reference times obtained by the second, third, and fourth steps, respectively;
A charging end reference time calculating method in a charging system comprising: In the fifth step, the charging upper limit time is compared with the scheduled charging end time, and if the charging upper limit time exceeds the scheduled charging end time, the charging based on the real time in the second step is performed. A sixth step of comparing the estimated termination time with the estimated charging termination time obtained by subtracting the SOC count time in the third step and determining the larger value as the estimated charging termination time of the secondary battery. When,
5. The charging in the charging system according to claim 4, further comprising: a seventh step of determining a charging end guide time in the fourth step if the upper limit charging time is less than a scheduled charging end time. Completion time calculation method.

Images