JP6468169B2 - Battery charging system - Google Patents

Description

  The present invention relates to a battery charging system, and more particularly to an improvement of an in-vehicle battery charging system that can be charged from an external power source and can be heated by a temperature raising device.

  When the vehicle is used in a cold region, when the temperature of the battery of the vehicle decreases, the internal resistance increases and the input / output power of the battery decreases. Also, if the battery electrolyte freezes in an extremely low temperature environment, power supply from the battery to the driving motor becomes impossible and the vehicle cannot run. In order to avoid these problems, in the battery charging system of the electric vehicle described in Patent Document 1, the electric power from the battery is charged while charging the vehicle battery with the electric power from the external power source by the external electric power charging means. The heater is operated to suppress the battery temperature drop. In the battery charging system described above, when the controller determines that the battery charge state value is smaller than the charge state value (battery holding capacity) at the start of heating of the heater due to power consumption by the heater, the battery power consumption is reduced. Performs supplementary charging control to replenish with external power. With this auxiliary charge control, the battery charge state value is held in the battery holding capacity.

JP 2012-191785 A

  In the configuration described in Patent Document 1, when a notification unit such as a display unit of a vehicle notifies a charge state value of a battery or a value based on the charge state value, the auxiliary charge control of the battery is performed by power consumption by the heater. When the notification is performed, the notification in the notification unit frequently changes. Such frequent changes in the state of charge value are intended to prevent a decrease in the temperature of the battery, and the user may feel uncomfortable when receiving notification of the change.

  The objective of this invention is providing the battery charge system which suppresses the notification of a change unnecessary for the user of the charge state value in a notification part or the value based on it during temperature rise of a battery.

The battery charging system according to the present invention includes an external power charging unit that converts alternating current power from an external power source into direct current power and supplies the battery to a vehicle-mounted battery to charge the battery, and the charge state value detection unit detects the battery power system. A notification unit for notifying a charge state value of the battery or a value based on the charge state value, a temperature detection unit for detecting the temperature of the battery, a temperature raising device for raising the temperature of the battery using the power of the battery, A controller for controlling the temperature raising device and the external power charging means. The controller raises the temperature of the battery by operating the temperature raising device when there is a predetermined auxiliary charge temperature raising request for the battery, and the charge state value of the battery is supplemented by operating the temperature raising device. When the battery voltage decreases to the start threshold value, the external power charging means executes temperature increase / complementary charge control for causing the battery to supplementarily charge a predetermined amount of power equal to or greater than the decrease in the charge state value, If you are running, when the increase and decrease of the state of charge value is that obtained repeated fixes the value based on the state of charge value or the state of charge value is notified in said notification unit is the battery charging system .

  According to the battery charging system of the present invention, it is possible to suppress notification of an unnecessary change to the user of the charging state value in the notification unit or a value based on the charging state value during the temperature rise of the battery.

1 is a schematic configuration diagram of a battery charging system according to an embodiment of the present invention. It is a flowchart which shows the control method which changes the display state of a display part using the battery charging system of embodiment. Battery temperature (a), power consumption (b) of charging device (b), charging power (c), battery charging state in an example of performing battery heating and supplementary charging using the battery charging system of the embodiment It is a figure which shows the time chart of a value (SOC). In the battery charging system of a comparative example, it is a figure corresponding to FIG. It is a figure corresponding to Drawing 3 in another example when performing temperature rising and supplementary charge of a battery using a battery charge system of an embodiment. It is a figure corresponding to Drawing 3 in another example when performing temperature rising and supplementary charge of a battery using a battery charge system of an embodiment.

  Hereinafter, embodiments according to the present invention will be described in detail. The numerical values, the processing procedure of the control method, and the like described below are examples for explanation, and can be changed according to the specifications of the battery charging system. Below, the same code | symbol is attached | subjected and demonstrated to the same structure. In addition, in the following, when a plurality of embodiments and modified examples are included, those characteristic portions can be appropriately combined.

  FIG. 1 is a schematic configuration diagram of a battery charging system 10 according to an embodiment of the present invention. The battery charging system 10 is used in a vehicle to charge an in-vehicle battery 11 with electric power from a household outlet. The vehicle is a vehicle that uses the electric motor 12 as a drive source, such as an electric vehicle or a plug-in hybrid vehicle. Hereinafter, the battery charging system 10 is referred to as a charging system 10.

  The charging system 10 includes an external power charging unit 20, a DC / DC converter 25, an auxiliary power source 26, a temperature raising device 27, a control unit 28, a display unit 32 as a notification unit, a charge state value detection unit 33, and a temperature detection unit. 34 is provided.

  The external power charging means 20 includes a power cable 21, a socket 22, a charger 23, and a first relay 24. The power cable 21 has a plug 21a at one end that can be connected to an external power source 40 via a connector (not shown) provided in a house or a power supply facility. The socket 22 is provided in the vehicle body of the vehicle so as to be exposed by opening a lid (not shown). The connector 21 b at the other end of the power cable 21 can be connected to the socket 22. One side of the charger 23 is connected to the socket 22, and the other side is connected to the input side terminal of the battery 11 via the first relay 24.

  In a state where the first relay 24 described later is closed and the charger 23 is connected between the battery 11 and the external power source 40, the charger 23 converts the AC power of the external power source 40 into DC power for charging. It has the function to do. The battery 11 is a chargeable / dischargeable secondary battery such as a nickel metal hydride battery or a lithium ion battery, and is a high voltage battery having a terminal voltage of about 200V, for example.

  The opening and closing of the first relay 24 is controlled by the control unit 28. The external power charging means 20 converts the AC power from the external power supply 40 into DC power by the charger 23 by closing the first relay 24 with the power cable 21 connected to the external power supply 40 and the socket 22. Then, the battery 11 is supplied and charged.

  The electric motor 12 that is a driving source of the vehicle is connected to the output side terminal of the battery 11 via the inverter 13 and the second relay 14. The electric motor 12 is, for example, a three-phase synchronous electric motor. The inverter 13 converts AC power input from the battery 11 side into DC power and outputs the DC power to the electric motor 12 side. The second relay 14 is controlled to be opened and closed by a signal from the control unit 28.

  The inverter 13 and the second relay 14 are controlled by the control unit 28. By controlling the inverter 13 with the second relay 14 closed, the DC power from the battery 11 is converted into AC power by the inverter 13 and then supplied to the electric motor 12 to drive the electric motor 12. . Thereby, the wheel (not shown) connected to the electric motor 12 is driven, and the vehicle travels.

  The auxiliary power supply 26 is a battery as a low voltage power supply of about 12 V, and is connected to the output side terminal of the battery 11 via the second relay 14 and the DC / DC converter 25. The DC / DC converter 25 steps down the DC power supplied from the battery 11 and supplies it to the auxiliary power supply 26 to charge the auxiliary power supply 26.

  The temperature raising device 27 is a heater having a heating wire that generates heat when energized, for example. The temperature raising device 27 is provided to raise the temperature of the battery 11, and is connected to the output side terminal of the auxiliary power source 26 via the third relay 29. The third relay 29 is controlled to open and close by the control unit 28. When the third relay 29 is closed, power from the auxiliary power supply 26 is supplied to the temperature raising device 27, the temperature raising device 27 is operated, and the battery 11 is heated.

  The charging state value detection unit 33 calculates a battery charging state value based on the current input to and output from the battery 11 and transmits a signal representing the battery charging state value to the control unit 28. The battery charge state value is, for example, the ratio (%) of the charge amount with respect to the full charge amount in the charge amount region permitted to be used, and is called SOC (State Of Charge). The charge state value detection unit 33 transmits a signal representing the SOC value to the control unit 28.

  The temperature detection unit 34 detects the temperature of the battery 11 and transmits a signal representing the temperature of the battery 11 to the control unit 28.

  The display unit 32 is a notification unit such as a liquid crystal display unit, and displays a SOC value as a notification with a numerical value or an indicator when a signal indicating the SOC value detected from the control unit 28 is received. At this time, the display unit 32 may be configured to display the representative value of each section on the display unit 32 as a value based on the detected SOC value by dividing the numerical value or the indicator by a predetermined width. For example, the display unit 32 may display a representative value of the SOC value of each section divided every 5%. For example, 95% may be displayed on the display unit 32 when the actual detection value of the SOC value is 94%, and 100% may be displayed on the display unit 32 when the actual detection value is 96%. The display based on the SOC may be a bar graph display, a pie chart display, a fraction display, or the like. The display unit 32 is provided as a part of a plurality of liquid crystal display units, for example, in a meter in front of the driver's seat of the vehicle.

  The control unit 28 controls the temperature raising device 27 and the external power charging means 20. The control unit 28 includes a storage unit such as a CPU and a memory.

  In the control of the temperature raising device 27, the control unit 28 controls the opening and closing of the third relay 29 with the second relay 14 closed. Thereby, the control unit 28 controls the temperature raising device 27 to start the operation of the temperature raising device 27 when the temperature of the battery 11 detected by the temperature detecting unit 34 is equal to or lower than a predetermined temperature raising start temperature U1. . Further, the control unit 28 controls the temperature raising device 27 so as to end the operation of the temperature raising device 27 when the temperature of the battery 11 is equal to or higher than a predetermined temperature rise end temperature U2. The temperature increase start temperature U1 is, for example, a temperature that is higher by a predetermined temperature (for example, a temperature in the range of 5 ° C. to 20 ° C.) than a temperature at which the electrolyte contained in the battery 11 starts to be frozen (for example, −30 ° C.). Is preferably set.

  In the control of the external power charging means 20, the control unit 28 operates the charger 23 and the first relay 24 of the external power charging means 20 with the vehicle socket 22 connected to the external power source 40 via the power cable 21. Controls opening and closing. Specifically, at the time of external charging in which the battery 11 is charged with the power of the external power source 40, the control unit 28 closes the first relay 24 and converts the AC power input from the external power source 40 by the charger 23 into DC power. Thus, the charger 23 and the first relay 24 are controlled. When the external charging is stopped, the control unit 28 controls to open the first relay 24.

  In addition, charging of the battery 11 includes main charging and auxiliary charging. “Main charging” is charging in which the battery 11 is externally charged so as to be fully charged when a predetermined main charging request condition is satisfied, and is also referred to as “active charging”.

  When the main charging request condition is satisfied, the control unit 28 executes main charging control for charging the battery 11 by main charging. For example, the “main charge request condition” is a case where the power cable is connected to the socket of the vehicle, the detected SOC value is equal to or less than a predetermined main charge start threshold, the vehicle is in a parked state, and a predetermined reservation is made. / It is established when the immediate charging condition is established, and it is determined that it is not established otherwise. The “main charging start threshold value” can be a value less than the fully charged SOC value. For example, when the parking brake of the vehicle is turned on and the parking button is turned on, it is determined that the vehicle is in a parking state. The “reservation / immediate charge condition” is satisfied when the reservation time is reached when the user has set the reservation charge using the operation unit of the vehicle, or when the reservation charge is not set. In other cases, it is determined as not established.

  On the other hand, when the battery 11 is fully charged and the main charging is completed, or when the main charging is not yet started in the reservation charging setting of the main charging and the vehicle is parked in a low temperature environment, The temperature of the battery 11 may decrease excessively. Due to such a decrease in the temperature of the battery 11, the performance of the battery 11 may be reduced, or the electrolyte solution may be frozen. Therefore, the control unit 28 controls the temperature raising device 27 to execute the temperature raising control for raising the temperature of the battery 11. At this time, when the temperature of the battery 11 is equal to or lower than the predetermined temperature rise start temperature K1, the control unit 28 operates the temperature raising device 27 until the temperature of the battery 11 becomes equal to or higher than the predetermined temperature rise end temperature K2. Generate a temperature rise request. On the other hand, since the electric power from the battery 11 is supplied to the temperature raising device 27 via the auxiliary power source 26 at this time, the SOC value of the battery 11 is lowered by the execution of the temperature raising control. If the SOC value decreases excessively, it takes a long time to charge the battery 11 to full charge when external charging is performed, or the degree of user dissatisfaction increases when the vehicle restarts due to excessive decrease in the SOC value. Become. Therefore, supplementary charging is performed to prevent such a situation.

  “Supplementary charging” is when the charging requirement condition is satisfied, in which the SOC value of the battery 11 is reduced to the auxiliary charging start threshold J1 by the operation of the temperature raising device 27 when the charging requirement condition is not established. Charging to be performed. In this supplementary charging, the battery 11 is charged with a predetermined amount of power that is equal to or greater than the decrease in the SOC value of the battery 11 due to the operation of the temperature raising device 27. By this supplementary charging, the SOC value of the battery 11 returns to the SOC value before the decrease or increases to a value higher than the SOC value before the decrease.

  The controller 28 raises the temperature of the battery 11 by operating the temperature raising device 27 when there is a predetermined auxiliary charge temperature raising request for the battery, and the SOC value of the battery 11 is changed to the auxiliary charging start threshold J1 by the operation of the temperature raising device 27. When the voltage drops to the maximum, the battery 11 is supplementarily charged, and control is executed. This control is a temperature rise / auxiliary charge control. The “auxiliary charge temperature increase request” occurs when the battery temperature increase request is made when the main charge request condition is not satisfied, and is not generated otherwise. In the temperature increase / auxiliary charge control, the auxiliary charge is terminated when the SOC value of the battery 11 increases and reaches the auxiliary charge end threshold value J2. When the reference SOC value Jm immediately before the SOC value of the battery 11 decreases due to the operation of the temperature raising device 27 is not a full charge value, the auxiliary charge end threshold value J2 is equal to or less than the full charge value and higher than the reference SOC value Jm. . When the reference SOC value Jm is a fully charged value, the auxiliary charging end threshold J2 is set to the reference SOC value Jm.

  On the other hand, when the temperature of the battery 11 is increased, the decrease in the SOC value and the execution of supplementary charging are repeated. When the SOC value or a value based on this SOC value is displayed on the display unit 32, the display state of the display unit 32 frequently changes. When the main charging is completed or when the main charging is not yet started, such a frequent change in display is unnecessary information for the user, and the user feels uncomfortable.

  In the embodiment, in order to eliminate such inconvenience, when the control unit 28 is executing the temperature rise / auxiliary charge control, the SOC value displayed on the display unit 32 or a value based on the SOC value is fixed. That is, maintain. Thereby, as will be described later, during the temperature rise of the battery 11, it is possible to suppress display of a change unnecessary for the user of the SOC value on the display unit 32 or a value based thereon.

  FIG. 2 is a flowchart illustrating a control method for changing the display state of the display unit using the charging system 10. When external charging to charge the battery 11 from the external power source 40 is performed, first, as a preparation, the user connects a connector (not shown) provided in the house or power supply facility and connected to the external power source 40 and the vehicle socket 22. Connect with the power cable 21. In step S10, the control unit 28 determines whether or not a predetermined main charge request has occurred. For example, when the power cable 21 connected to the external power supply 40 is connected to the socket 22, reserved charging is set, the vehicle is parked, and the SOC value of the battery 11 is lower than the main charging start threshold value. Is determined that this charging request condition is satisfied. Hereinafter, step S is simply referred to as S.

  If it is determined in S10 that there is a main charge request, the main charge control for performing the main charge is executed, and the SOC display on the display unit 32 is not fixed. And the display control of the display part 32 is complete | finished. At this time, the battery 11 is heated or not heated depending on the temperature state of the battery 11. In FIG. 2, executing the main charging control and not executing the main charging control are indicated by “main charging ON” and “main charging OFF”, respectively. Further, raising the temperature of the battery 11 and not raising the temperature are indicated by “temperature rise ON” and “temperature rise OFF”, respectively.

  If it is determined in S10 that there is no main charge request, it is determined in S11 whether or not a battery temperature increase request as an auxiliary charge temperature increase request has occurred. At this time, when the temperature of the battery 11 detected by the temperature detection unit 34 is equal to or lower than a preset temperature increase start temperature K1, a battery temperature increase request is generated. Further, when the temperature of the battery 11 becomes equal to or lower than the temperature rise start temperature K1, the temperature rise of the battery 11 is started by the temperature riser 27, and the battery temperature rise request is also made when the temperature rise end temperature K2 has not yet been reached. Has occurred. If the determination result in S11 is affirmative, the SOC display on the display unit is fixed so that the display does not change (S12). At this time, the main charging is not executed, and the battery 11 is not heated.

  If the determination result in S11 is negative, the SOC display on the display unit 32 is not fixed, and the display control of the display unit 32 is terminated.

  After the SOC display is fixed in S12, in S13, the temperature raising control for raising the temperature of the battery 11 by the temperature raising device 27 and the auxiliary charging control for performing the auxiliary charging of the battery 11 are executed. Then, in S14, it is determined again whether there is a main charge request as in S10. This determination process may reach the time reserved by the user's reserved charge during or after the temperature increase control and the auxiliary charge control. In this case, the main charge is performed and the SOC display is released. Set to do. If the determination result in S14 is affirmative, the SOC display is released in S16.

  If the determination in S14 is negative, it is determined whether or not the temperature increase of the battery 11 has been completed when the detected temperature of the battery 11 reaches the temperature increase end temperature (S15). At this time, if the determination result in S15 is affirmative, the SOC display is released in S16. On the other hand, when the determination result of S15 is negative, the temperature rise of the battery 11 is not completed, so the process returns to S13 and the process is repeated.

  According to the charging system 10 described above, an unnecessary display change of the SOC value on the display unit 32 or a value based on the SOC value can be suppressed during the temperature rise of the battery 11. This will be described with reference to FIGS. FIG. 3 shows the battery temperature (a), the power consumption (b) of the temperature raising device 27, and the charging power (in a case where the battery 11 is heated and supplemented using the charging system 10 of the embodiment. c) It is a figure which shows the time chart of a battery charge condition value (SOC). FIG. 4 is a diagram corresponding to FIG. 3 in the charging system of the comparative example.

  FIG. 3 shows a state where the reservation time has not yet been reached when the vehicle is parked in a low-temperature environment and a charge reservation is made. Before time t1, the SOC value of the battery 11 is held at a constant value Jm (for example, 70%). Then, before the time t1, the battery temperature gradually decreases, and when the temperature reaches a predetermined temperature rise start temperature K1, a battery temperature rise request is generated and the temperature rise of the battery 11 is started by the temperature raising device 27. This gradually increases the battery temperature. And by the operation of the temperature raising device 27, the power consumption of the temperature raising device 27 is generated and kept constant. As a result, the SOC value of the battery 11 decreases from time t1, but reaches the auxiliary charging start threshold J1 at time t2. As a result, the auxiliary charge of the battery 11 is performed with the electric power of the external power source 40, and the SOC value of the battery 11 increases from time t2 to t3. Then, since the SOC value of the battery 11 reaches the auxiliary charging end threshold value J2 at time t3, the auxiliary charging of the battery 11 is stopped, the SOC value is lowered again, and this is repeated. Then, at time t6, the temperature of the battery 11 reaches the temperature increase end temperature K2, and the temperature increase control ends.

  At this time, after the time t1, there is no main charge request but there is a battery temperature rise request, so the display of the SOC value on the display unit 32 is fixed according to the control method of the display unit 32 described in FIG. “Display SOC” indicated by a thick solid line in FIG. 3D indicates the SOC value Jm displayed on the display unit 32. As described above, in the embodiment, since the display on the display unit 32 does not change in a state where there is no main charging request, it is possible to suppress or prevent user discomfort. In the example of FIG. 3, the auxiliary charge start threshold value J1 is set on the lower side with respect to the reference SOC value Jm at the start of auxiliary charge, and the auxiliary charge end threshold value J2 is set on the upper side. Thereby, since the width from the start to the end of the auxiliary charging can be made relatively large, the controllability can be improved, and the difference between the actual SOC value and the SOC value displayed on the display unit 32 becomes excessively large. Can be prevented. The auxiliary charging end threshold value J2 may be made to coincide with the reference SOC value Jm at the time of starting auxiliary charging.

  In the comparative example shown in FIG. 4, unlike the embodiment, the control unit 28 is the case where the present charging request condition is not satisfied, and when there is an operation request for the temperature raising device 27, the SOC value of the display unit 32 is changed. The display is not fixed. On the display unit 32, the detected SOC value is displayed as it is. In the comparative example, other configurations are the same as those in the embodiment. In such a comparative example, since the decrease and increase of the SOC value are repeated during the temperature rise of the battery 11, the user who sees the display unit 32 feels uncomfortable. Further, the user's expectation that the SOC value does not change because charging is being reserved is different from the change in display on the display unit 32, so the user is confused. Such an inconvenience does not occur in the embodiment shown in FIG.

  In FIG. 3 described above, the case where the temperature raising control is executed before the start of the main charging has been described. On the other hand, FIG. 5 is a figure corresponding to FIG. 3 in another example when the vehicle is placed in a low temperature environment and performs the temperature rise and the auxiliary charge of the battery 11 using the charging system 10 of the embodiment. In the example of FIG. 5, immediately after the user connects the external power source 40 and the vehicle socket 22 with the power cable 21 (time t0), the temperature rise to the battery 11 and the main charging are started simultaneously. At time t0, the temperature of the battery 11 is equal to or lower than the temperature increase start temperature U1, and a temperature increase request is generated. Then, at time t1, the charge amount of the battery 11 reaches the fully charged SOC value (100%), the main charge is terminated, and the main charge request condition is not satisfied.

  On the other hand, at time t1, the temperature of the battery 11 has not yet reached the temperature rise end temperature K2. For this reason, since the temperature increase request of the battery 11 is continued, the SOC value of the battery 11 gradually decreases. Then, since the auxiliary charging start threshold value J1 is reached at time t2, auxiliary charging is performed. At time t3, the SOC value reaches the auxiliary charging end threshold value J2, and the auxiliary charging is completed. At this time, the auxiliary charging end threshold value J2 coincides with the fully charged SOC value (100%). Then, the SOC value gradually decreases, and this is repeated. At this time, the SOC value displayed on the display unit 32 is fixed to a fully charged constant SOC value (100%) after time t1, so that the user's discomfort can be suppressed or prevented.

  FIG. 6 is a diagram corresponding to FIG. 3 in another example when the temperature of the battery 11 and supplementary charging are performed using the charging system 10 of the embodiment. In the example of FIG. 6, after the main charging of the battery 11 is completed, the vehicle is left in a low temperature environment, the temperature of the battery 11 gradually decreases, and reaches the temperature increase start temperature K1 at time t1. Then, at time t1, the temperature raising device 27 is activated and the temperature rise of the battery 11 is started. At this time, since the main charging is completed before the time t1, the main charging request condition is not satisfied.

  On the other hand, since the temperature rise of the battery 11 is started at time t1, the SOC value of the battery 11 gradually decreases. Then, since the auxiliary charging start threshold value J1 is reached at time t2, auxiliary charging is performed. At time t3, the SOC value reaches the auxiliary charging end threshold value J2, and the auxiliary charging is completed. The auxiliary charging end threshold value J2 coincides with the fully charged SOC value (100%). Then, the SOC value gradually decreases, and this is repeated. At this time, as in the example of FIG. 5, the SOC value displayed on the display unit 32 is fixed to a constant SOC value (100%) of full charge after the time t <b> 1. Can be prevented.

  In the example of FIGS. 5 and 6, the fully charged SOC value is displayed on the display unit 32 even after the time t <b> 1, even though it is not actually fully charged. At this time, the user may remove the power cable 21. In this case, the display is switched so that the actual SOC value is displayed on the display unit 32. In order to prevent the user from feeling dissatisfied even when such display switching occurs, it is preferable to set the decrease in the auxiliary charging start threshold J1 with respect to the auxiliary charging end threshold J2 so as not to become excessively large.

  Although the case where the notification unit is the display unit 32 has been described above, the notification unit may be a transmission unit (not shown) provided in the vehicle. The transmission unit has a function of receiving a SOC value or a signal representing a value based on the SOC value from the control unit 28 and transmitting it as a radio signal to the outside of the vehicle. At this time, the wireless signal is received by a portable device (not shown) having a display unit, and the portable device displays the SOC value represented by the wireless signal or a value based on the SOC value on the display unit. The mobile device is a terminal having a wireless communication function such as a smartphone or a tablet terminal. In the configuration using such a transmission unit, when the temperature increase / auxiliary charge control is being executed, the SOC value notified by the transmission unit or a value based on the SOC value is fixed. Also with this configuration, as in the configuration described in the above embodiment, notification of an unnecessary change to the user of the charge state value in the transmission unit or a value based thereon can be suppressed during the temperature rise of the battery 11.

  DESCRIPTION OF SYMBOLS 10 Battery charging system (charging system), 11 Battery, 12 Electric motor, 13 Inverter, 14 2nd relay, 20 External power charging means, 21 Power cable, 21a plug, 21b Connector, 22 Socket, 23 Charger, 24 1st Relay, 25 DC / DC converter, 26 Auxiliary power supply, 27 Temperature raising device, 28 Control unit, 29 Third relay, 32 Display unit, 33 Charging state value detection unit, 34 Temperature detection unit, 40 External power supply.

Claims (1)

An external power charging means for converting alternating current power from an external power source into direct current power and supplying it to a vehicle-mounted battery to charge the battery;
A notification unit for notifying a charge state value of the battery detected by a charge state value detection unit or a value based on the charge state value;
A temperature detector for detecting the temperature of the battery;
A temperature raising device that raises the temperature of the battery using electric power of the battery;
A controller for controlling the temperature raising device and the external power charging means,
The controller raises the temperature of the battery by operating the temperature raising device when there is a predetermined auxiliary charge temperature raising request for the battery, and the charge state value of the battery is supplemented by operating the temperature raising device. When lowering to the start threshold, the external power charging means executes a temperature increase / complementary charge control to supplementarily charge the battery with a predetermined amount of power that is equal to or greater than the amount of decrease in the state of charge.
If you are running the heating-supplemental charge control, wherein when the increase and decrease of the state of charge value is that obtained are repeated, a value based on the state of charge value or the state of charge value is notified in said notification unit Fix the battery charging system.

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