JP5477212B2 - Electric vehicle system - Google Patents

Description

  The present invention relates to an electric vehicle system capable of accurately estimating a charging time up to a target charging amount when charging a battery.

  2. Description of the Related Art Charging systems that charge a battery that is mounted on a vehicle and drives a motor of the vehicle with electric power from the outside (for example, a commercial power source) while the vehicle is stopped are put into practical use.

  In the case of using a commercial power source, it is possible to use late-night power with a low electricity bill. As such a charging system, the operation mode of the power receiving unit is set to be switchable in advance prior to charging, and the operation mode is a connection between the first mode that prioritizes charging in a predetermined time zone, and the power receiving unit and an external power source. A vehicle and a charging cable (see Patent Document 1) including a second mode in which charging is started when the charging is performed are known.

Japanese Patent Application Laid-Open No. 2009-100569

  When the charging system described in Patent Document 1 is set to the economy charging mode, the charging system waits for charging, starts charging when it comes to midnight power hours, and determines whether the battery is fully charged based on the SOC of the battery. . If the battery is still fully charged even after the midnight power hours, the charging time is extended.

  By the way, the charging time of the battery depends on the temperature of the battery. When the outside air temperature is low, the battery temperature decreases. As the battery temperature decreases, the internal resistance of the battery increases. When the internal resistance of the battery increases, the charging time calculated based on the SOC of the battery during charging increases with respect to the original estimate. Therefore, when charging is performed by setting the charging start time, there is a problem that the charging capacity of the battery is insufficient.

  The present invention has been made in view of such problems, and it is an object of the present invention to improve the accuracy of predicting the charging time up to the target charge amount of the battery and to charge the battery with high accuracy.

  According to one embodiment of the present invention, the electric vehicle system is capable of running by driving an electric motor with electric power from a battery and charging the battery with external electric power. The electric vehicle system includes an outside air temperature detecting unit that detects an outside air temperature, a battery temperature detecting unit that detects the temperature of the battery, a preset charging time period, a preset charging time, and an electric power from an external power source. And a charge control device for charging the battery to a target charge amount. The charging control device includes a battery temperature predicting unit that predicts the temperature of the battery in the charging time zone based on the detected outside air temperature and the detected battery temperature when the vehicle is stopped, and based on the predicted battery temperature. Charging time calculating means for calculating a predicted charging time for charging the battery to the target charging amount, and a charging time for extending the charging time when the calculated predicted charging time is larger than a preset charging time. Extending means.

  According to the present invention, the battery temperature change is predicted based on the outside air temperature and the battery temperature before the battery charging time period, and the charging time is extended as necessary based on the prediction result. Accordingly, it is possible to improve the prediction accuracy of the charging time of the battery, prevent the battery from being insufficiently charged, and reliably charge the battery to the target charge amount.

It is explanatory drawing which shows the structure of the charging system of the 1st Embodiment of this invention. It is explanatory drawing of the charge by the electric vehicle system of the 1st Embodiment of this invention. It is explanatory drawing of charge of the battery of the 1st Embodiment of this invention. It is a flowchart of the timer charge process of the 1st Embodiment of this invention. It is explanatory drawing of the charge by the electric vehicle system of the 2nd Embodiment of this invention. It is explanatory drawing of the charge by the electric vehicle system of the 3rd Embodiment of this invention. It is explanatory drawing of deterioration of the battery of the 4th Embodiment of this invention. It is explanatory drawing of calculation of the required charge time of the 4th Embodiment of this invention. It is explanatory drawing of the charge by the electric vehicle system of the 5th Embodiment of this invention. It is explanatory drawing of the charge by the electric vehicle system of embodiment of the 6th Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment>
FIG. 1 is an explanatory diagram showing the configuration of the charging system 1 according to the first embodiment of the present invention.

  The charging system 1 includes an electric vehicle system 100, an external power supply 50, and a charging cable 40 that connects the electric vehicle system 100 and the external power supply 50. In the figure, portions connected by a solid line indicate transmission / reception of electric power, and portions connected by a dotted line indicate transmission / reception of a control signal.

  The external power source 50 includes a commercial power source 52 and a power outlet 51. The commercial power source 52 is a supply source of commercial power of, for example, 50 Hz and 200 V, and the power outlet 51 is an interface connected to the charging cable 40.

  The charging cable 40 includes a power plug 43, a control box 42, and a charging plug 41. The power plug 43 is connected to a power outlet 51 of the external power source 50. The control box 42 has a function of detecting a system leakage during charging and interrupting the wiring, and a function of sending a current capacity signal to the vehicle. Charging plug 41 is connected to charging port 23 of electric vehicle system 100.

  The electric vehicle system 100 travels by driving the drive motor 31 with the electric power of the battery 11. The battery 11 is charged with electric power from the external power supply 50.

  The electric vehicle system 100 includes a battery 11, a charging control device 21, a charger 22, a charging port 23, a charging relay 24, an interface device (I / F) 25, and an outside air temperature sensor 26.

  The DC power stored in the battery 11 is supplied to the inverter 32. The inverter 32 converts direct current power into alternating current power and controls the voltage and frequency to supply to the drive motor 31. Thereby, the drive motor 31 is driven and the vehicle travels. Further, the DC power of the battery 11 is supplied to a high-power supplementary recording system 33 including a motor and a pump. Further, the DC power of the battery 11 is stepped down to an appropriate DC voltage (for example, 12V) by the DC / DC converter 34 and supplied to the weak electricity supplementary system 36 including a control device, lighting, and the like.

  The battery 11 includes a battery control device 12, a battery relay 13, and a temperature sensor (battery temperature detection unit) 14. The battery control device 12 acquires the temperature of the battery 11 detected by the temperature sensor 14 and the state (voltage, SOC, etc.) of the battery 11 and sends it to the charge control device 21. Further, the battery control device 12 controls the charging of the battery 11 based on a command from the charge control device 21. The battery relay 13 intermittently supplies power to the battery 11 and outputs power.

  The charge control device 21 controls the charger 22 and the battery control device 12 to control the charging of the battery 11. The charging control device 21 controls the start and end of charging of the battery 11 based on the charging mode set by the interface device 25.

  The charging mode includes an immediate charging mode in which charging is started immediately after the charging plug 41 is connected to the charging port 23, and a charging time zone set by a charging start time and a charging stop time preset by the interface device 25. A timer charging mode for charging the battery is provided.

  The outside air temperature sensor (outside air temperature detector) 26 detects the outside air temperature of the electric vehicle system 100.

  The charging port 23 is connected to a charging plug of the charging cable 40 and receives power from the external power source 50.

  The charger 22 converts AC power input from the charging port 23 into DC power appropriate for charging the battery 11 based on an instruction from the charging control device 21, and supplies the battery via the charging relay 24. Output. The charging relay 24 intermittently supplies power for charging the battery 11.

  In the electric vehicle system 100 configured as described above, a method for charging the battery 11 will be described.

  When the charging control device 21 detects that the charging plug 41 of the charging cable 40 is connected to the charging port 23, the charging control device 21 activates the charger 22 and the battery control device 12 to start charging control of the battery 11.

  When the charging control device 21 determines to charge the battery 11, the battery relay 13 and the charging relay 24 are connected to electrically connect the battery 11 and the charger 22. The charger 22 receives the current capacity signal output from the control box 42 of the charging cable 40 and recognizes the current capacity of the charging cable 40. The charger 22 controls the input current from the external power source 50 within the recognized current capacity.

  The charger 22 converts AC power input from the charging cable 40 into DC power, boosts the voltage to an appropriate voltage for charging the battery, and outputs the power to the battery 11.

  The power output from the charger 22 is controlled in real time by the charge control device 21. The charging control device 21 is based on the charging power required by the battery control device 12, the output power that can be output by the charger 22, and the power consumed by the inverter 32, high voltage supplementary system 33, and DC / DC converter 34. The electric power output from the charger 22 is determined.

  During charging, the battery control device 12 monitors the state of the battery 11 such as the SOC, voltage, temperature, etc., determines the required charging power of the battery 11 based on these states, and transmits the charge control device 21. . The charging control device 21 controls the charging power output from the charger 22 based on the transmitted charging request power. Charging is continued until the battery control device 12 detects that the battery 11 is fully charged by the SOC or voltage of the battery 11 except when the charging end time is reached. When the battery 11 is fully charged, the battery control device 12 requests the charge control device 21 to stop charging.

  In response to this, the charging control device 21 controls the charging power input / output by the charger 22 to zero and shuts off the battery relay 13 and the charging relay 24. This completes charging. Further, the charging control device 21 similarly ends the charging when the preset charging end time is reached.

  In the timer charging mode, the charging control device 21 determines the charging start time and the charging end time based on the numerical values set by the user interface device 25. The charging control device 21 does not start charging until the charging start time is reached even if the charging cable 40 is connected.

  Note that the charging start time and the charging end time are set by the user directly inputting the time to the interface device 25 or by selecting an arbitrary mode from a plurality of preset charging modes.

  Next, the setting of the charging time in the timer charging mode will be described.

  FIG. 2 is an explanatory diagram of charging when there is a difference between the battery temperature and the outside air temperature in the timer charging mode.

  The time chart shown in FIG. 2 is such that the electric vehicle system 100 stops after traveling, starts charging the battery 11 at a preset charging start time T1, and ends charging at a preset charging end time T2. A set example is shown. The charging time at this time is Hs. Note that the charging start time T1 and the charging end time T2 set, for example, a time zone (for example, charging start time 23:30, charging end time 7:00) to which a late-night power charge is applied.

  While the electric vehicle system 100 is running, the battery temperature rises due to the loss in the battery 11 as the battery 11 is discharged / charged by the output of vehicle driving power or the input of energy regenerative power.

  When the vehicle is stopped in this state and the vehicle is stopped, the battery temperature Tb0 becomes higher than the outside air temperature Ta0. Therefore, the temperature of the battery 11 gradually decreases while the vehicle 11 is stopped.

  Here, when the timer charging mode is set, at T1, which is the charging start time of timer charging, the battery temperature decreases to Tb1 with respect to the battery temperature Tb0 at the vehicle stop time T0. At this time, the required charge time up to the target charge amount at the battery temperature Tb0 is H0, whereas the required charge time up to the target charge amount at the battery temperature Tb1 increases to H1.

  When the temperature of the battery 11 decreases, the internal resistance of the battery 11 increases. For this reason, when charging the battery 11, it is necessary to reduce the charging current during charging so that the battery 11 does not become overvoltage due to an increase in internal resistance. As a result, when the temperature of the battery 11 is low, compared with the case where the temperature of the battery 11 is high, charging power is reduced and the required charging time is increased.

  In FIG. 2, when there is a difference between the temperature of the battery 11 and the outside air temperature at the charging start time T1, the temperature of the battery 11 further decreases even after the charging is started. For example, while the battery temperature at the charging start time T1 is Tb1, the temperature of the battery 11 decreases to Tb2 at the charging stop time T2. At this time, the required charging time at temperature Tb2 increases to H2 with respect to the required charging time H1 at temperature Tb1.

  As described above, in the timer charging mode, when the temperature of the battery 11 is higher than the outside air temperature, the charging time required for the preset charging time is extended by gradually decreasing the temperature of the battery 11. There is. Therefore, even if the charging time up to the target charge amount is estimated at the vehicle stop time T0 or the charging start time T1, the charging may end in a state where the battery 11 is not fully charged at the charging end time T2. .

  Therefore, in the first embodiment of the present invention, as described below, the charging time is controlled by the temperature of the battery 11 and the outside air temperature.

  FIG. 3 is an explanatory diagram of charging of the battery 11 by the electric vehicle system 100 of the present embodiment.

  In FIG. 3, the battery temperature Tb1 when the vehicle is stopped is 10 ° C., the outside temperature Ta0 is −20 ° C., the vehicle stop time T0 is 13:00, and the charging start time T1 in timer charging is 23:00. An example is shown in which the timer charging end time T2 is set to 7:00 and the charging time Hs is set to 8 hours.

  The charging start time T1, the charging end time T2, and the charging time Hs are set in advance by the user inputting to the interface device 25.

  Since the battery temperature Tb0 is 10 ° C. and the outside air temperature Ta0 is −20 ° C. at the vehicle stop time T0, the battery temperature decreases while the vehicle is left. At the charging start time T1, the battery temperature decreases from Tb0 (10 ° C.) to Tb1 (−15 ° C.). The temperature transition of the battery 11 is indicated by a dotted line in FIG.

  Thereby, the required charging time to the target charging amount is H0 (8 hours) when the battery temperature is Tb0 (10 ° C.), but H1 (10 hours) when the battery temperature is Tb1 (−15 ° C.). ) Therefore, the required charging time up to the target charge amount is increased by H1-H0 = 2 hours. For this reason, the charging time is insufficient at the preset charging time Hs (8 hours).

  In order to prevent a shortage of charging time, the charging control device 21 performs the following process to extend the charging time.

  FIG. 4 is a flowchart of the timer charging process performed by the charging control device 21 according to the first embodiment.

  When the charging control device 21 detects that the vehicle has stopped, the charging control device 21 acquires the outside air temperature and the battery temperature (S101). The outside air temperature and the battery temperature are acquired a plurality of times at predetermined time intervals in order to predict the transition of the temperature change.

  Note that the process of step S101 is executed when the vehicle stops last before the scheduled charging start time, instead of simply detecting that the vehicle has stopped. For example, it may be detected by detecting that the charging plug 41 is connected to the charging port 23 after the vehicle stops. Further, when the vehicle starts traveling again, the charging control device 21 cancels the procedure of this flowchart.

  The charging control device 21 acquires the outside air temperature from the outside air temperature sensor 26. Further, the battery temperature is acquired from the temperature sensor 14 via the battery control device 12. And the transition of the temperature change of the battery 11 is estimated from these acquired values (S102). The transition of the temperature change can be predicted by calculating how much the gradient obtained by differentiating the acquired outside air temperature and the battery temperature with time is changed.

  Next, the charging control device 21 predicts the battery temperature Tb1 at the charging start time T1 from the predicted transition of the temperature change of the battery 11. This constitutes a battery temperature prediction means. Then, the required charging time H1 up to the target charging amount at this temperature predicted value is calculated (S103). This constitutes a charging time calculation means.

  Next, the charging control device 21 compares the required charging time H1 up to the calculated target charging amount with the charging time Hs preset by the interface device 25 (S104).

  If the charging control device 21 determines that the charging time H1 is greater than the charging time Hs as a result of the comparison, the charging control device 21 calculates a value ΔHp obtained by subtracting Hs from H1, and adds the charging time ΔHp for the charging time Hs shortage. The value is set to a new charging time (S105). As a result, the insufficient charging time is extended, and charging time extending means is configured.

  As a result of the comparison, when it is determined that the charging time H1 is less than the charging time Hs, the preset charging time Hs is not changed.

  The charging control device 21 starts charging at the charging start time according to the set new charging time (S106).

  When the charging time H1 is longer than the charging time Hs, the charging control device 21 extends the charging time by ΔHp that is the difference between them. For example, the charging time is extended by advancing the charging start time by the difference ΔHp or by sending the charging end time by the difference ΔHp. Alternatively, the charging time is extended by dividing the difference ΔHp in half, the charge start time is advanced by ΔHp / 2, and the charge end time is sent by ΔHp / 2. Note that which of these is selected may be set by the user using the interface device 25, or may be always fixed to any one of the methods.

  In the present embodiment, the battery temperature at the charging start time T1 is predicted from the transition of the temperature change of the battery 11 predicted based on the outside air temperature and the battery temperature. However, the present invention is not limited to this, and the battery temperature in the charging time zone (between charging start time T1 and charging end time T2) is predicted, and the charging time is calculated based on the predicted value. For example, the battery temperature at the charging end time T2 may be predicted, and the charging time may be calculated based on the predicted battery temperature. When the battery temperature is predicted at the charging end time, the predicted value of the battery temperature becomes lower, and the margin becomes larger with respect to the charging time. Therefore, when it is desired to secure a margin, the battery temperature at the charging end time may be predicted.

  The electric vehicle system 100 according to the first embodiment of the present invention configured as described above predicts the temperature of the battery 11 at the charging start time from the temperature of the battery 11 and the outside air temperature, and based on the predicted temperature, The charging time until the target charge amount of the battery 11 is changed.

  By comprising in this way, the prediction precision of the charging time of the battery 11 can be improved, the battery 11 can be prevented from being insufficiently charged, and the battery can be reliably charged up to the target charge amount.

Second Embodiment
Next, a second embodiment of the present invention will be described.

  In the second embodiment, the charging time to the target charging amount is predicted based on the average value of the battery temperature in the charging time zone. The basic configuration of the second embodiment is the same as that shown in FIG.

  FIG. 5 is an explanatory diagram of charging of the battery 11 by the electric vehicle system 100 according to the second embodiment.

  As described in FIG. 4 of the first embodiment, the charging control device 21 acquires the outside air temperature and the battery temperature when the vehicle stops (S101), and predicts the transition of the temperature change of the battery 11 (S102). ).

  Next, in step S103, the charging control device 21 predicts an average value Tba of the battery temperature from the charging start time T1 to the charging end time T2. In the example of FIG. 5, the battery temperature at the charging start time T1 is predicted to be −15 ° C. On the other hand, the average value Tba of the battery temperature during the charging time zone is predicted to be -17 ° C.

  The average value Tba of the battery temperature is predicted by, for example, calculating the temperature change per unit time in the charging time zone from the predicted change in the temperature of the battery 11 and dividing the integrated value by the charging time Hs. Is done. Alternatively, the predicted change in the temperature of the battery 11 may be predicted based on the intermediate value between the predicted battery temperature at the charging start time T1 and the predicted battery temperature at the charging end time T2.

  Thereafter, the charge control device 21 calculates the required charge time H1 based on the predicted temperature value in the same manner as the flowchart shown in FIG. 4 (S103), and the required charge time H1 up to the calculated target charge amount is set in advance. The charging time Hs is compared (S104).

  When it is determined that the charging time H1 is longer than the charging time Hs, a value obtained by adding the insufficient charging time ΔHp to the charging time Hs is set as a new charging time to extend the charging time (S105). Then, charging is started at the charging start time according to the new charging time (S106). Note that the charging time is added by changing the charging start time or the charging end time, as in the first embodiment.

  In the example shown in FIG. 5, the charging time H1 at the predicted battery temperature Tb1 at the charging start time T1 is estimated to be 10 hours. On the other hand, the charging time Ha based on the average value Tba of the battery temperature is predicted to be 10.5 hours. Therefore, it is possible to estimate the charging time more accurately and to prevent the charging capacity from being insufficient.

  The electric vehicle system 100 according to the second embodiment of the present invention configured as described above predicts the temperature of the battery 11 in the charging time period, based on the predicted temperature, as in the first embodiment described above. Thus, the charging time until the target charging amount of the battery 11 is changed.

  In particular, in the second embodiment, since the charging time is estimated based on the predicted value of the average value of the battery temperature in the charging time zone, the prediction accuracy of the charging time of the battery 11 can be improved. Thereby, it is possible to prevent the battery 11 from being insufficiently charged, and to reliably charge to the target charge amount.

<Third Embodiment>
Next, a third embodiment of the present invention will be described.

  In the third embodiment, the charging time to the target charge amount is predicted in consideration of the internal resistance of the battery 11. The basic configuration of the third embodiment is the same as that shown in FIG.

  FIG. 6 is an explanatory diagram of charging of the battery 11 by the electric vehicle system 100 according to the third embodiment.

  The battery 11 generates heat due to power loss due to the internal resistance of the battery 11 during charging. Therefore, the temperature of the battery 11 may rise during charging.

  As shown in FIG. 6, the temperature of the battery 11 changes from Tb1 to Tb2 from the charging start time T1 to the charging end time T2 when power loss due to the internal resistance is not taken into consideration.

  Here, when the temperature increase of the battery 11 being charged is taken into consideration, the temperature of the battery 11 changes from Tb1 to Tb3 from the charging start time T1 to the charging end time T2. Since the temperature of the battery 11 is different from the predicted change in temperature during charging, the charging time up to the target charge amount also changes.

  Therefore, in the third embodiment, the average value Tba of the battery temperature in the charging time zone is calculated in consideration of the temperature rise of the battery 11 being charged.

  As described in FIG. 4 of the first embodiment, the charging control device 21 acquires the outside air temperature and the temperature of the battery 11 when the vehicle stops (S101), and predicts the transition of the temperature change of the battery 11. (S102).

  Next, in step S103, the charging control device 21 predicts an average value Tba of the battery temperature in the charging time period from the charging start time T1 to the charging end time T2.

  Specifically, the charge control device 21 predicts the temperature average value Tba of the battery in the charge time period, as in the second embodiment described above. And the temperature rise by charge in a charge time slot | zone is added to this temperature average value Tba, and it is set as the new temperature average value Tba. In the example of FIG. 5, the battery temperature at the charging start time T1 is predicted to be −15 ° C. On the other hand, the average value Tba of the battery temperature in consideration of the increase value of the battery temperature in the charging time zone is predicted to be −16 ° C.

  The temperature rise of the battery 11 due to charging is obtained, for example, by previously obtaining an internal resistance value for the battery 11 through experiments or the like, and the charge control device 21 stores this and uses it for calculation. When the sensitivity of the temperature information of the battery 11 is high due to the internal resistance of the battery 11 and the temperature rise is large, the current internal resistance value of the battery 11 is predicted in advance, and the temperature rise value of the battery 11 is calculated based on this. It may be predicted.

  Thereafter, the charge control device 21 calculates the required charge time H1 based on the predicted temperature value in the same manner as the flowchart shown in FIG. 4 (S103), and the required charge time H1 up to the calculated target charge amount is set in advance. The charging time Hs is compared (S104).

  When it is determined that the charging time H1 is longer than the charging time Hs, a value obtained by adding the insufficient charging time ΔHp to the charging time Hs is set as a new charging time, and (S105) charging starts with the new charging time. Charging is started at the time (S106).

  In the example shown in FIG. 6, the charging time H1 at the predicted battery temperature Tb1 at the charging start time T1 is estimated to be 10 hours. On the other hand, the charging time Ha based on the average value Tba (−16 ° C.) considering the increase value of the battery temperature is predicted to be 10.2 hours. Therefore, it is possible to estimate the charging time more accurately and to prevent the charging capacity from being insufficient.

  The electric vehicle system 100 according to the third embodiment of the present invention configured as described above predicts the temperature of the battery 11 in the charging time period, based on the predicted temperature, similarly to the second embodiment described above. Thus, the charging time until the target charging amount of the battery 11 is changed.

  Further, when the deterioration of the battery 11 progresses, the charging capacity decreases and the internal resistance of the battery 11 increases. For this reason, a deviation may occur with respect to the estimation of the charging time when the battery 11 is new, and as a result, the charging amount may be insufficient, or the charging may be stopped earlier than the target time. As a result, the accuracy of estimation of the charging time may be deteriorated.

  In the third embodiment, since the charging time is estimated based on the average value of the temperature of the battery 11 in the charging time zone and the temperature increase value due to the internal resistance of the battery, the prediction accuracy of the charging time of the battery 11 can be improved. it can. Thereby, it is possible to prevent the battery 11 from being insufficiently charged, and to reliably charge to the target charge amount.

<Fourth embodiment>
Next, a fourth embodiment of the present invention will be described.

  In the fourth embodiment, the charging time to the target charge amount is predicted in consideration of the deterioration of the battery 11. The basic configuration of the third embodiment is the same as that shown in FIG.

  FIG. 7 is an explanatory diagram of deterioration of the battery 11 according to the fourth embodiment.

  The battery 11 deteriorates with time, and the internal resistance gradually increases. When the internal resistance increases, the temperature of the battery 11 being charged rises, so that the required charging time of the battery 11 increases.

  In addition, when the battery 11 is deteriorated, the charge capacity of the battery 11 is reduced, so that the full charge amount is reduced. When the full charge amount decreases, the required charging time of the battery 11 decreases.

  Thus, the deterioration of the battery 11 affects the charging time up to the target charge amount. Therefore, by predicting this effect and calculating the charging time, the prediction accuracy of the charging time of the battery 11 can be improved even when the battery 11 is deteriorated.

  FIG. 8 shows a block diagram of calculation of the required charging time in consideration of the influence of deterioration of the battery 11 in the charging control device 21 of the fourth embodiment.

  The charge control device 21 calculates the deterioration of the capacity of the battery 11 from the current state of the battery 11 (block B1). And based on this charge capacity, the present battery capacity is determined, and this is set as target charge SOC (block B2).

  Further, the charge control device 21 acquires the current SOC of the battery 11 and sets it as the charge start SOC (block B3).

  Moreover, the charge control apparatus 21 acquires the transition of the temperature change of the battery 11 predicted from the outside air temperature and the battery temperature (block B4).

  Then, the charging control device 21 calculates the charging time based on the predicted temperature value in the charging time zone from the previously stored target SOC, charging start SOC, and battery temperature map (block B5).

  Further, the charging control device 21 calculates a deterioration state of the internal resistance of the battery 11 from the current state of the battery 11 (block B6), and determines a deterioration coefficient corresponding to the deterioration state of the internal resistance (block B7). .

  Then, the charging control device 21 corrects the charging time by multiplying the calculated charging time by this deterioration coefficient, and calculates the charging time up to the target charging amount (block S8).

  Thereafter, similarly to the flowchart shown in FIG. 4, the charge control device 21 compares the required charge time H1 up to the calculated target charge amount with a preset charge time Hs (S104).

  When it is determined that the charging time H1 is longer than the charging time Hs, a value obtained by adding the insufficient charging time ΔHp to the charging time Hs is set as a new charging time, and (S105) charging starts with the new charging time. Charging is started at the time (S106).

  The electric vehicle system 100 according to the fourth embodiment of the present invention configured as described above predicts the temperature of the battery 11 in the charging time period, based on the predicted temperature, as in the first embodiment. Thus, the charging time until the target charging amount of the battery 11 is changed.

  In particular, in the fourth embodiment, since the charging time is corrected based on the deterioration state of the battery 11 (capacity deterioration and internal resistance deterioration), it is possible to improve the prediction accuracy of the battery 11 charging time. Thereby, it is possible to prevent the battery 11 from being insufficiently charged, and to reliably charge to the target charge amount.

<Fifth Embodiment>
Next, a fifth embodiment of the present invention will be described.

  In the fifth embodiment, the timing for predicting the charging time up to the target charge amount is different from those in the first to fifth embodiments. The basic configuration of the fifth embodiment is the same as that shown in FIG.

  FIG. 9 is an explanatory diagram of charging of the battery 11 by the electric vehicle system 100 according to the fifth embodiment.

  Depending on the set values of the charging start time and the charging stop time, charging may start after a long time has elapsed since the vehicle stop time. In such a case, even if the outside air temperature is substantially constant, the battery temperature predicted from the outside air temperature Ta0 and the battery temperature Tb0 when the vehicle is stopped is equal to the actual temperature of the battery 11 at the charging start time T1. Misalignment can be significant.

  Therefore, by setting the timing for calculating the charging time to the target charging amount not to the time when the vehicle is stopped, but to a time that is a predetermined time before the charging start time T1, the amount of deviation from the battery temperature predicted at the vehicle stopping time can be set. Can be reduced. Thereby, the estimation accuracy of the charging time is further improved.

  Specifically, when it is detected in step S101 of FIG. 4 that the vehicle has stopped, the charging control device 21 calculates the charging time by a predetermined time ΔHt before the preset charging start time T1. Set the timer to And when this timer starts, the process after step S101 of the above-mentioned FIG. 4 is performed.

  That is, when the timer is started, the outside air temperature (Ta4) and the battery temperature (tb4) at that time are acquired. Based on these values, the transition of the temperature change of the battery 11 is predicted again, and the charging time (H1) is calculated again based on this prediction.

  Charging is started at the charging start time by the charging time determined by this process.

  The electric vehicle system 100 according to the fifth embodiment of the present invention configured as described above predicts the temperature of the battery 11 in the charging time period, based on the predicted temperature, as in the first embodiment described above. Thus, the charging time until the target charging amount of the battery 11 is changed.

  In particular, in the fifth embodiment, since the charging time to the target charge amount is calculated a predetermined time before the charging start time, not when the vehicle is stopped, the battery temperature is predicted due to a change in the outside air temperature while the vehicle is stopped. It is possible to prevent an error from occurring. Thereby, it is possible to prevent the battery 11 from being insufficiently charged, and to reliably charge to the target charge amount.

<Sixth Embodiment>
Next, a sixth embodiment of the present invention will be described.

  In the sixth embodiment, the timing for predicting the charging time up to the target charge amount is different from those in the first to fifth embodiments. The basic configuration of the sixth embodiment is the same as that shown in FIG.

  FIG. 10 is an explanatory diagram of charging of the battery 11 by the electric vehicle system 100 according to the sixth embodiment.

  As described in the fifth embodiment, when charging starts after a long time has elapsed since the vehicle stop time, the predicted battery temperature is equal to the actual temperature of the battery 11 at the charging start time T1. Misalignment can be significant. In contrast, in the fifth embodiment, the charging time is calculated a predetermined time ΔHt before the preset charging start time T1.

  In the sixth embodiment, the charging time is set to be calculated a plurality of times from the vehicle stop time T0 to a preset charging start time T1. The timing for calculating the charging time is set every predetermined time, for example, according to the time from the vehicle stop time T0 to the charging start time T1. Or you may make it set to predetermined time irrespective of vehicle stop time T0 and charge start time T1.

  The charge control device 21 sets a timer when detecting that the vehicle has stopped in step S101 in FIG. When this timer reaches the calculation time of the charging time, the outside air temperature and the temperature of the battery 11 are acquired, and the processes after step S101 in FIG. 4 are executed.

  Furthermore, after calculating the charging time in steps S104 and S105 of FIG. 4, the process returns to step S101 again and waits until the timer reaches the charging time calculation time again. Thereafter, this process is repeated, and when the charging start time T1 is reached, the process proceeds to step S106, and charging is started at the charging start time by the charging time determined by the previous process.

  The electric vehicle system 100 according to the sixth embodiment of the present invention configured as described above predicts the temperature of the battery 11 in the charging time period, based on the predicted temperature, as in the first embodiment described above. Thus, the charging time until the target charging amount of the battery 11 is changed.

  In particular, in the sixth embodiment, since the charging time up to the target charge amount is calculated a plurality of times from the time when the vehicle is stopped until the charging start time, the temperature of the battery 11 due to the change in the outside air temperature while the vehicle is stopped. It is possible to prevent an error from occurring in the prediction. Thereby, it is possible to prevent the battery 11 from being insufficiently charged, and to reliably charge to the target charge amount.

  In the fifth embodiment and the sixth embodiment, the calculation of the charging time until the target charge amount may be obtained as in the second embodiment, the third embodiment, or the fourth embodiment described above.

DESCRIPTION OF SYMBOLS 1 Charging system 11 Battery 12 Battery control apparatus 14 Temperature sensor 21 Charging control apparatus 22 Charger 23 Charging port 25 Interface apparatus 26 Outside temperature sensor 31 Drive motor 100 Electric vehicle system

Claims (7)

In an electric vehicle system capable of driving by driving an electric motor with electric power of the battery and charging the battery with external electric power,
An outside temperature detector for detecting the outside temperature;
A battery temperature detector for detecting the temperature of the battery;
A charge control device that charges the battery to a target charge amount with the power of the external power source in a preset charging time zone with a preset charging time;
The charge control device includes:
Battery temperature predicting means for predicting the temperature of the battery in the charging time zone based on the detected outside air temperature and the detected battery temperature when the vehicle is stopped;
Charging time calculating means for calculating a predicted charging time for charging the battery to a target charge amount based on the predicted battery temperature;
Charging time extending means for extending the charging time when the calculated predicted charging time is longer than the preset charging time;
An electric vehicle system comprising:   The electric vehicle system according to claim 1, wherein the charging time zone is set by a charging start time and a charging end time set in advance. The battery temperature predicting means predicts an average value of the battery temperature in the charging time zone,
The said charge time calculation means calculates the estimated charge time for charging the said battery to target charge amount based on the average value of the estimated said battery temperature, The Claim 1 or 2 characterized by the above-mentioned. Electric vehicle system.   The battery temperature predicting unit is configured such that an average value of the battery temperature in the charging time zone predicted based on the detected outside air temperature and the detected battery temperature is used to charge the battery by charging in the charging time zone. 4. The electric vehicle system according to claim 3, wherein an average value of the temperature of the battery in the charging time period is calculated by adding predicted values of the temperature increase.   The charging time calculation unit is configured to charge the battery by target charging based on the temperature of the battery in the charging time zone, an increase in internal resistance due to the deterioration state of the battery, and a reduction in charge capacity due to the deterioration state of the battery. The electric vehicle system according to any one of claims 1 to 4, wherein a predicted charging time for charging up to an amount is calculated. The battery temperature predicting means predicts the temperature of the battery in the charging time zone a predetermined time before the charging start time,
The electric vehicle system according to any one of claims 2 to 5, wherein the charging time calculation unit calculates a predicted charging time before a predetermined time from the charging start time. The battery temperature predicting means predicts the temperature of the battery in the charging time zone a plurality of times from a predetermined time before the charging start time to the charging start time,
The said charge time calculation means calculates an estimated charge time in multiple times from the predetermined time before the said charge start time to the said charge start time, The Claim 1 characterized by the above-mentioned. Electric vehicle system.

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