JP2016158309A - Charge and discharge control device for on-vehicle battery and charge and discharge device for on-vehicle battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charge and discharge control device for on-vehicle battery and charge and discharge device for on-vehicle battery, capable of suppressing degradation in the service life of an on-vehicle battery by reducing a time of exposure to a high temperature under a high SOC state.SOLUTION: The charge and discharge control device for on-vehicle battery performs discharge control of outputting electric power of an on-vehicle battery to the outside and charge control of inputting electric power from the outside of the vehicle into the on-vehicle battery. The charge and discharge control device for on-vehicle battery includes: a connection detection part for detecting connection of the vehicle with a charge and discharge device outside the vehicle; and a charge and discharge control part for executing discharge control when an ambient temperature is not less than a predetermined threshold value, under a state where the connection is detected.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an on-vehicle battery charge / discharge control device and an on-vehicle battery charge / discharge device, and more particularly to an on-vehicle battery charge / discharge control device that performs charge / discharge control via a charge / discharge device outside the vehicle. The present invention relates to a discharge device.

  In recent years, power is stored in batteries mounted on electric vehicles and hybrid electric vehicles at times when power demand is low at night when power costs are low, and from battery to housing during times when power demand is high during daytime when power costs are high. Power management systems that supply power to offices and offices have been put into practical use. Such a power management system contributes to lowering the electricity charges of houses and offices and reducing the load on power generation facilities.

  For example, Patent Document 1 discloses an electric power system that manages electric power exchanged between a vehicle and a house in consideration of an electric power supply / demand situation in the house. In Patent Document 1, the power system predicts the power demand on the day of the house, the amount of power generated by the solar cell, and the like from the vehicle in the morning or after sunset when the predicted power demand is large and the amount of power generated by the solar cell is small. It describes that charge / discharge control is performed so that electric power is supplied to a house.

JP 2008-54439 A

  A battery generally has a property that deterioration is more likely to proceed as the temperature is higher and the state of charge (SOC) is higher. The vehicle has a much longer parked time during its lifetime than a running time. Therefore, the battery life tends to be shortened as the time during which the battery of the stopped vehicle is exposed to a high temperature in a high SOC state becomes longer.

  However, the electric power system described in Patent Document 1 is configured to supply electric power from the vehicle to the house in a time zone in which the predicted demand power in the house is large. As a time zone in which the predicted demand power is large, a time zone in the morning or after sunset is illustrated. Therefore, for example, when the predicted demand power is low during the daytime in summer, the battery may be exposed to a high temperature environment in a high SOC state. Therefore, in the electric power system described in Patent Document 1, the battery life may be shortened.

  The present invention has been made in view of the above problems, and an object of the present invention is to reduce the time during which an in-vehicle battery is exposed to a high temperature in a high SOC state and to suppress a decrease in the lifetime of the in-vehicle battery. An object of the present invention is to provide an on-vehicle battery charge / discharge control measure and an on-vehicle battery charge / discharge device.

  In order to solve the above-described problem, according to an aspect of the present invention, discharge control for outputting electric power of an in-vehicle battery to the outside of the vehicle and charging control for inputting electric power from the outside of the vehicle to the in-vehicle battery are performed. In the in-vehicle battery charge / discharge control device, a connection detection unit that detects a connection between the vehicle and a charge / discharge device outside the vehicle, and the ambient temperature is equal to or higher than a predetermined threshold in a state where the connection is detected. A charge / discharge control device for an in-vehicle battery, comprising: a charge / discharge control unit that executes discharge control.

  The charge / discharge control unit may maintain the state of charge of the in-vehicle battery at a predetermined level after the execution of the discharge control.

  The charge / discharge control unit may execute the discharge control within a preset discharge permission time.

  The charge / discharge control unit may start charging the in-vehicle battery when the end time of the discharge permission time comes after execution of the discharge control.

  The charge / discharge control unit may execute the discharge control when the current temperature is equal to or higher than a predetermined temperature threshold.

  The charge / discharge control unit may execute the discharge control when the average value of the current temperature over the last few days is equal to or greater than a predetermined average temperature threshold even if the current temperature is less than the threshold.

  The charge / discharge control unit is configured to perform the discharge control when the ambient temperature falls below the threshold value or when a predetermined time before a predetermined vehicle use scheduled time comes. You may start charging.

  The outside of the vehicle is a power system of a power management system provided in a house or office, and the charge / discharge control unit is configured to perform the discharge control based on an action history of the user of the vehicle. You may start charge to a vehicle-mounted battery.

  The charge / discharge control unit may start charging the in-vehicle battery when receiving an input of a discharge stop operation.

  The discharge permission time may be set based on a power cost.

  Moreover, according to another viewpoint of this invention, in order to solve the said subject, the charging / discharging control apparatus of one of the vehicle-mounted batteries mentioned above, and the power transmission / reception connection part electrically connected with respect to the said vehicle, A vehicle-mounted battery charging / discharging device is provided.

  According to the on-vehicle battery charge / discharge control device and the on-vehicle battery charge / discharge device according to the present invention, it is possible to reduce the time during which the in-vehicle battery is exposed to a high temperature in a high SOC state, thereby suppressing a decrease in the life of the in-vehicle battery. .

It is a schematic diagram which shows the whole structure of an electric power system. It is a block diagram which shows the structural example of the charging / discharging control apparatus of the vehicle-mounted battery concerning one Embodiment of this invention. It is explanatory drawing which shows the implementation conditions of charging / discharging control. It is a timing chart which shows the example which does not implement charging / discharging control of this embodiment. It is a timing chart which shows the example which does not implement charging / discharging control of this embodiment. It is a timing chart which shows the example which implemented charge / discharge control of this embodiment. It is a timing chart which shows the example which implemented charge / discharge control of this embodiment. It is a timing chart which shows the example which implemented charge / discharge control of this embodiment. It is a flowchart which shows the process of charging / discharging control of this embodiment. It is a flowchart which shows the implementation determination process of charging / discharging control.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

<< 1. Overall configuration of power system >>
Hereinafter, as an embodiment of the present invention, an example in which charge / discharge control of a battery mounted on a vehicle used for commuting is performed will be described. First, the overall configuration of the power system according to the present embodiment will be described. FIG. 1 is a schematic diagram illustrating a configuration example of a power system 10 according to the present embodiment. The power system 10 illustrated in FIG. 1 includes a charging / discharging device 100, a vehicle 200, and a building power system 300.

<1-1. Vehicle>
The vehicle 200 is an electric vehicle (EV) or a hybrid electric vehicle (HEV), and includes, for example, a 200V high voltage battery 210 and a battery control device 250. The vehicle 200 includes drive wheels, a motor that drives the drive wheels, and an inverter that supplies three-phase AC power to the motor. The high voltage battery 210 is a power supply source that supplies DC power to the inverter. The vehicle 200 may be configured such that regenerative power is generated by a driving motor during deceleration, and the regenerative power is stored in the high voltage battery 210.

  When vehicle 200 is a hybrid electric vehicle, vehicle 200 may include a power generation motor that generates power stored in high-voltage battery 210 and an inverter that supplies three-phase AC power to the power generation motor. . Such a hybrid electric vehicle is configured to generate electric power by rotating a power generation motor according to the output of the engine, and to store the electric power in the high voltage battery 210.

  Vehicle 200 is configured to be able to charge high voltage battery 210 from the outside of vehicle 200. For example, vehicle 200 includes a connector having a terminal to which external charging / discharging device 100 is connected, and a switch that electrically connects high voltage battery 210 and the connector when vehicle 200 is connected to charging / discharging device 100. Prepare. Thus, power can be input from the building power system 300 to the high voltage battery 210 in a state where the vehicle 200 is connected to the power transmission / reception connection unit 110 of the charging / discharging device 100.

  In addition, in a state where vehicle 200 and charging / discharging device 100 are connected, the electric power stored in high voltage battery 210 of vehicle 200 can be output to building power system 300 via charging / discharging device 100. That is, the high voltage battery 210 of the vehicle 200 is a part of a power supply source to the building power system 300. In the case of a non-contact charging system using a coil or the like, the connector may not be provided.

  The battery control device 250 controls the battery unit including the high voltage battery 210. The battery control device 250 performs cooling control of the battery unit, temperature management, and detection of the battery voltage. The battery voltage is a value that changes in accordance with the SOC of the high-voltage battery 210. The higher the battery voltage, the higher the SOC. In a state where vehicle 200 is connected to charging / discharging device 100, battery control device 250 is connected to charging / discharging control device 150 of charging / discharging device 100. Thereby, the battery control device 250 can transmit the value of the battery voltage to the charge / discharge control device 150.

<1-2. Building power system>
The building power system 300 includes a distribution board 310, a power storage unit 320, and a power management control device 350. In addition to the power storage unit 320 and the charging / discharging device 100, the distribution board 310 is connected to an external power transmission network, a power generation device in a building, and a power selling system. A solar cell is typically exemplified as the power generation device. In addition, the distribution board 310 is connected to electrical wiring to an outlet (not shown) in the building, so that electric power can be supplied to an electrical product connected to the outlet.

  The power storage unit 320 includes a power storage device such as a hot water heat storage device or an ice heat storage device, and accumulates electric power supplied from an external power transmission network or power generation device via the distribution board 310. The power storage unit 320 is configured to be able to store the power of the high voltage battery 210 of the vehicle 200 supplied via the distribution board 310. The electric power stored in the power storage unit 320 is consumed in the building via the distribution board 310 and can be supplied to an external power selling system and the charging / discharging device 100.

  The power management control device 350 controls power input / output via the distribution board 310. For example, the power management control device 350 controls power storage and discharge to the power storage unit 320, controls input / output of power to the charge / discharge device 100, and controls power transmission to the power selling system. The power management control device 350 is connected to the charging / discharging control device 150 of the charging / discharging device 100 via wired or wireless communication means such as a LAN (Local Area Network), for example. Can be sent and received.

<1-3. Charge / Discharge Device>
The charge / discharge device 100 includes a power transmission / reception connection unit 110, a temperature sensor 140, and a charge / discharge control device 150. Charging / discharging device 100 stores power in building power system 300 in high-voltage battery 210 of vehicle 200 and outputs the power stored in high-voltage battery 210 of vehicle 200 to building power system 300 It is. The charging / discharging device 100 is connected to the building power system 300 by electric wiring. In addition, the charging / discharging device 100 includes an emergency stop button 120 and a discharge stop button 130. The charging / discharging device 100 may include a current limiting circuit (not shown) or an outlet.

(1-3-1. Power transmission / reception connection part)
The power transmission / reception connection unit 110 is a part that electrically connects the vehicle 200 and the charge / discharge device 100 in order to exchange power between the charge / discharge device 100 and the vehicle 200. The power transmission / reception connection unit 110 is typically a charging cable having a connector connected to the connector of the vehicle 200. However, in the case of a non-contact charging system using a coil or the like, the power input / output unit including the coil corresponds to the power transmission / reception connection unit 110. The power transmission / reception connection unit 110 includes means for detecting whether or not the vehicle 200 is connected, and the charge / discharge control device 150 can detect a connection between the vehicle 200 and the charge / discharge device 100.

(1-3-2. Emergency stop button and discharge stop button)
The emergency stop button 120 is a switch for stopping any charge / discharge control of the high voltage battery 210 of the vehicle 200 via the charge / discharge device 100. Discharge stop button 130 is a switch for prohibiting discharge control for outputting power from high-voltage battery 210 of vehicle 200 to building power system 300. The discharge stop button 130 is turned on when it becomes necessary to use the vehicle 200 in a time zone in which discharge control can be performed. Accordingly, priority is given to charging control of the high voltage battery 210 of the vehicle 200.

  That is, when the emergency stop button 120 is turned on, charging to the high voltage battery 210 and discharging from the high voltage battery 210 are all stopped, while when the discharge stop button 130 is turned on, the high voltage battery 210 is turned on. Charging the voltage battery 210 is performed. On / off information of the emergency stop button 120 and the discharge stop button 130 is input to the charge / discharge control device 150.

(1-3-3. Temperature sensor)
The temperature sensor 140 detects the outside air temperature Ta. Information on the outside air temperature Ta detected by the temperature sensor 140 is input to the charge / discharge control device 150. As the temperature sensor 140, a known temperature sensor 140 can be used as appropriate.

(1-3-4. Charge / Discharge Control Device)
The charge / discharge control device 150 performs charge control for inputting power from the building power system 300 to the high-voltage battery 210 of the vehicle 200 and discharge control for outputting power from the high-voltage battery 210 to the building power system 300. In the present embodiment, the charge / discharge control device 150 acquires the battery voltage Vb and the outside air temperature Ta, and executes charge / discharge control.

  FIG. 2 is a diagram illustrating a configuration example of the charge / discharge control device 150, and illustrates a function of the charge / discharge control device 150 in a block diagram. The charge / discharge control device 150 is mainly configured with a known microcomputer. The charge / discharge control device 150 includes a connection detection unit 152, an air temperature detection unit 154, a voltage detection unit 156, a discharge availability determination unit 158, a discharge permission time setting unit 160, and a charge / discharge control unit 170. Each of these units is realized, for example, by executing a software program by a microcomputer.

  The charge / discharge control device 150 includes a communication unit (not shown), and can transmit and receive information to and from the battery control device 250 of the vehicle 200 and the power management control device 350 of the building power system 300. As already described, the charge / discharge control device 150 and the power management control device 350 are connected via, for example, wired or wireless communication means. The charge / discharge control device 150 and the battery control device 250 are connected via the power transmission / reception connection unit 110 in a state where the vehicle 200 is connected to the charge / discharge device 100.

  The charge / discharge control device 150 includes a storage element (not shown) such as a ROM (Read Only Memory) in which a software program is stored. Further, the charge / discharge control device 150 includes a storage element (not shown) such as a RAM (Random Access Memory). The RAM stores various types of input information, calculation results in the above-described units, and the like.

(1-3-4-1. Connection detection unit)
Connection detection unit 152 detects the connection between vehicle 200 and charge / discharge device 100. In the present embodiment, the power transmission / reception connection unit 110 of the charging / discharging device 100 is provided with means for detecting connection, and the connection detection unit 152 is based on whether or not a connection signal is input from the means. And the connection between the charging / discharging device 100 is detected. The connector of the vehicle 200 may be provided with means for detecting the connection between the vehicle 200 and the charging / discharging device 100, and the connection detection unit 152 may detect the connection based on information output from the battery control device 250. .

(1-3-4-2. Temperature detector)
The temperature detection unit 154 detects the outside air temperature Ta based on the information on the outside air temperature Ta input from the temperature sensor 140. For example, the temperature detector 154 detects the outside temperature Ta every 5 to 30 minutes. The detected outside air temperature Ta is stored in a storage element such as a RAM.

  In the present embodiment, the air temperature detection unit 154 calculates the average air temperature Tave for the most recent days based on the detected outside air temperature Ta. For example, the air temperature detection unit 154 sets the average value of the outside air temperature Ta at 24 o'clock every hour from 1 o'clock to 24:00, out of the outside air temperature Ta stored in the storage unit, as the daily average air temperature Tave_day. Let the average value of the daily average temperature Tave_day of the number of days be the average temperature Tave. The calculated average temperature Tave is stored in a storage element such as a RAM. The predetermined number of days for calculating the average temperature Tave can be, for example, 3 to 7 days, but is not limited thereto.

(1-3-4-3. Voltage detection unit)
Voltage detector 156 detects battery voltage Vb of high voltage battery 210 of vehicle 200. In the present embodiment, the voltage detection unit 156 detects the value of the battery voltage Vb input from the battery control device 250. The voltage detection unit 156 may directly detect the battery voltage Vb of the high voltage battery 210.

(1-3-4-4. Discharge permission time setting section)
The discharge permission time setting unit 160 sets the time during which discharge control is permitted according to the input of the discharge permission time by the user. The discharge permission time can be arbitrarily set by the user, but is basically set based on the following idea. The following setting example of the discharge permission time is an example in which the vehicle 200 is used for commuting.

  For example, when considering workdays on weekdays, since the vehicle 200 is used for commuting during morning and evening commuting hours, the SOC of the high voltage battery 210 must be high during these commuting hours. I must. Therefore, the discharge control from the high voltage battery 210 to the building power system 300 is prohibited during the time zone before the commuting time zone.

  In addition, when the vehicle 200 is connected to the home charging / discharging device 100 at night, power is acquired from an external power transmission network and stored in the high-voltage battery 210 of the vehicle 200 in a time zone where the power cost is low. By keeping it, the electricity bill can be reduced. In addition, at night, since the power demand in the house is relatively low, the necessity of using the power stored in the high voltage battery 210 of the vehicle 200 in the house is low. Therefore, discharge control from the high-voltage battery 210 to the building power system 300 is prohibited during the time period from when the user returns home to work the next morning.

  On the other hand, when the vehicle 200 is connected to the workplace charging / discharging device 100 during the daytime, the SOC of the high voltage battery 210 of the vehicle 200 is high because the outside temperature Ta is likely to rise. Then, the deterioration of the high voltage battery 210 is likely to proceed. Therefore, the discharge permission time can be set in the time zone in which the vehicle 200 is connected to the charge / discharge device 100 at work. However, as described above, the time zone before the evening commuting time zone needs to be charged to the high voltage battery 210, and thus can be excluded from the discharge permission time.

  In the setting example of the discharge permission time described so far, it is sufficient that at least the charge / discharge control device 150 of the charge / discharge device 100 at work can perform the charge / discharge control according to the present embodiment. However, the usage time zone and usage mode of the vehicle 200 are different depending on the user, and various methods for setting the discharge permission time are conceivable. Based on the above-described concept, charge control is given priority during times when power costs are low, and discharge control is permitted during times when the availability of the vehicle 200 is low and the outside temperature Ta can be high. A discharge permission time may be set for the charge / discharge device 100 at work.

(1-3-4-5. Discharge availability determination unit)
The discharge possibility determination unit 158 includes information on the outside air temperature Ta detected by the air temperature detection unit 154 in a state where the connection detection unit 152 detects the connection between the vehicle 200 and the charge / discharge device 100, and the discharge permission time. Based on the discharge permission time set by the setting unit 160, it is determined whether or not discharge control is possible. In the present embodiment, the discharge enable / disable determining unit 158 determines whether the emergency stop button 120 is turned on / off, the discharge stop button 130 is turned on / off, within the discharge permission time, the outside air temperature Ta is equal to or higher than a predetermined threshold Ta_th, and the average Whether discharge control is possible is determined based on whether the temperature Tave is equal to or higher than a predetermined average temperature threshold Tave_th.

  FIG. 3 is an explanatory diagram showing an example of conditions for performing the discharge control determined by the discharge enable / disable determining unit 158. In the example illustrated in FIG. 3, priority is set for the execution conditions. First, when the emergency stop button 120 is on, the charge / discharge control for the high voltage battery 210 of the vehicle 200 is stopped at all. The on / off condition of the emergency stop button is a condition for determining whether the charging / discharging control for the high voltage battery 210 is stopped for some reason although the vehicle 200 is connected to the charging / discharging device 100. .

  Second, even when the emergency stop button 120 is turned off, when the discharge stop button 130 is turned on, the discharge control is prohibited, and the quick charge control to the high voltage battery 210 is performed. Executed. The on / off condition of the discharge stop button is a condition for determining whether the user needs to use the vehicle 200 and the high voltage battery 210 is not rapidly charged.

  Thirdly, even when the emergency stop button 120 is turned off, if it is outside the discharge permission time, the discharge control is prohibited and the charge control to the high voltage battery 210 is executed. The condition for the discharge permission time is a condition for determining whether or not the discharge control from the high voltage battery 210 is possible from the viewpoint of the power cost, the availability of the vehicle 200, and the possibility of an increase in the outside air temperature Ta.

  Fourthly, the discharge control is permitted when it is within the discharge permission time and the current outside air temperature Ta is equal to or higher than a predetermined threshold value Ta_th. The current external temperature Ta condition is a condition for determining whether the high voltage battery 210 is placed in a high temperature environment. The threshold value Ta_th can be set to a value within a range of 25 to 30 degrees, for example.

  Fifth, even if the current outside air temperature Ta is less than the predetermined threshold Ta_th, the discharge control is permitted when the average air temperature Tave is equal to or higher than the predetermined average temperature threshold Tave_th. When the current outside air temperature Ta is less than the predetermined threshold value Ta_th and the average air temperature Tave is less than the predetermined average temperature threshold value Tave_th, the discharge control is prohibited and the charge control is executed. The condition of the average temperature Tave is a condition for determining whether the temperature is high even when the outside temperature Ta is less than the threshold Ta_th. The average temperature threshold value Tave_th can be set to a value within a range of 25 to 30 degrees, for example. The average temperature threshold value Tave_th and the threshold value Ta_th of the outside air temperature Ta may be different.

  Note that when determining whether or not discharge control is possible, some of the above five conditions may be omitted. For example, when determining whether or not discharge control is possible based on the outside air temperature Ta, the setting of the discharge permission time may be omitted. In addition, the priority order of the above five conditions can be changed as appropriate.

(1-3-4-6. Charge / Discharge Control Unit)
Charging / discharging control unit 170 performs charging control on high voltage battery 210 of vehicle 200 or discharging control from high voltage battery 210 according to the determination result of discharge possibility determination unit 158. For example, the charge / discharge control unit 170 transmits a charge / discharge instruction to the power management control device 350 of the building power system 300 and causes the power management control device 350 to execute predetermined charge / discharge control. However, a circuit configuration for controlling input / output of electric power to the vehicle 200 is provided in the charge / discharge device 100, and the charge / discharge control unit 170 controls the circuit configuration so that charge / discharge control is performed. It may be.

  When executing the charge control, the charge / discharge control unit 170 executes the charge control so that the battery voltage Vb of the high voltage battery 210 becomes the target value Vb_th0, for example. The target value Vb_th0 (%) of the battery voltage Vb can be a voltage value when the SOC is in the range of 90 to 100%, for example. In the present embodiment, the charge / discharge control unit 170 transmits a charge instruction to the power management control device 350 of the building power system 300. In response to the charging instruction, the power management control device 350 supplies power to the charging / discharging device 100 via the distribution board 310.

  In addition, when the end time of the discharge permission time is set a predetermined time before the commuting time zone in consideration of the commuting time zone, the charging / discharging control unit 170, with the end of the discharge permission time, The quick charge control may be executed when the discharge control is finished and the charge control is started. By executing such quick charge control, the charge time until the vehicle 200 is used can be shortened, and the discharge permission time can be set longer.

  Further, when performing the discharge control, the charge / discharge control unit 170 may start discharging when the battery voltage Vb is equal to or higher than a predetermined upper limit voltage Vb_th1. The upper limit voltage Vb_th1 can be set as the upper limit of the SOC in which the deterioration of the high voltage battery 210 is difficult to proceed even if the outside air temperature Ta increases. The upper limit voltage Vb_th1 may be a voltage value when the SOC is 10%, for example. The upper limit voltage Vb_th1 may be a value larger than the lowest voltage Vb_th2 or the same value.

  In addition, the charging / discharging control unit 170 discharges the electric power stored in the high voltage battery 210 when starting discharging. Thereby, when the discharge control is necessary, the SOC of the high-voltage battery 210 quickly decreases. In addition, after executing the discharge control, the charge / discharge control unit 170 executes control to hold the battery voltage Vb of the high voltage battery 210 at a predetermined level. For example, the charge / discharge control unit 170 ends the discharge when the battery voltage Vb reaches the minimum voltage Vb_th2, and holds the battery voltage Vb at the minimum voltage Vb_th2. The minimum voltage Vb_th2 can be set to a voltage value when the SOC is within a range of 5 to 10%, for example.

  Thereby, when vehicle 200 is stopped for a long time in a time zone in which outside temperature Ta can rise, high voltage battery 210 is not maintained in a high SOC state. Therefore, the progress of deterioration of the high voltage battery 210 can be suppressed.

<< 2. In-vehicle battery charge / discharge control method >>
The configuration of the on-vehicle battery charge / discharge control device 150 according to the present embodiment has been described above. Next, an example of the charge / discharge control method executed by the on-vehicle battery charge / discharge control device 150 will be described.

<2-1. Timing chart>
4 to 8 are timing charts showing changes in the SOC of the high voltage battery 210 mounted on the vehicle 200 for one day. Among these, FIG.4 and FIG.5 shows the example when not performing charging / discharging control concerning this embodiment, and FIGS. 6-8 shows the example when performing charging / discharging control concerning this embodiment. ing.

(2-1-1. Comparison)
(2-1-1-1. First comparison)
FIG. 4 shows an example in which only high-voltage battery 210 of vehicle 200 used for commuting is charged at home at night. In this example, normal charge control is executed between the time of returning home (t4) and the morning commute time (t1), and the SOC of the high voltage battery 210 becomes 100%. During the morning commute time (t1 to t2), power is consumed (discharged) by the drive motor of the vehicle 200, and the SOC of the high voltage battery 210 decreases. Since the charge / discharge control for the high voltage battery 210 is not performed after the arrival at the office (t2) and until the evening return time (t3), the SOC of the high voltage battery 210 does not change. During the evening commute (t3 to t4), power is consumed (discharged) by the drive motor of the vehicle 200, and the SOC of the high voltage battery 210 further decreases. Then, after returning home (t4), the normal charging control of the high voltage battery 210 is executed again, and the SOC of the high voltage battery 210 is set to 100%.

  In the example of FIG. 4, when the outside temperature Ta rises while the vehicle 200 is stopped at work during the daytime, the high voltage battery 210 is exposed to a high temperature environment in a high SOC state. Become. Therefore, deterioration of the high voltage battery 210 is likely to proceed.

(2-1-1-2. Second proportionality)
FIG. 5 shows an example in which the high voltage battery 210 of the vehicle 200 is charged at night and the electric power stored in the high voltage battery 210 is used or sold (discharged) in a house during the day. In this example, the normal charging control is executed after the end of the night time zone when the power demand in the house is large (t14) and before the beginning of the morning time zone when the power demand becomes large again (t11). The SOC of the high voltage battery 210 is 100%. In the morning time period (t11 to t12) when the power demand is large, the electric power stored in the high voltage battery 210 is consumed in the house, and the SOC of the high voltage battery 210 decreases. After that, the power stored in the high voltage battery 210 is consumed in the house as needed until the start of the night time zone when the power demand is high (t13), and the SOC of the high voltage battery 210 decreases.

  During the night time period (t13 to t14) when the power demand is large, the power stored in the high voltage battery 210 is consumed in the house, and the SOC of the high voltage battery 210 further decreases. Then, after the end of the night time zone when the power demand is high (t14), the normal charging control of the high voltage battery 210 is executed again, and the SOC of the high voltage battery 210 is set to 100%. In the example of FIG. 5, when the outside air temperature Ta rises during the daytime while the vehicle 200 is stopped, the high voltage battery 210 is exposed to a high temperature environment in a high SOC state. Therefore, deterioration of the high voltage battery 210 is likely to proceed.

(2-1-2. Example of the present embodiment)
(2-1-2-1. First example)
FIG. 6 shows an example in which discharge control is performed on the high voltage battery 210 of the vehicle 200 used for commuting in conjunction with the current outside temperature Ta within the discharge permission time. In this example, normal charge control is executed and the SOC of the high voltage battery 210 is 100 after the end of the night time zone (t30) when the power demand in the house is large and before the morning commute time (t21). %become. During the morning commute time (t21 to t22), power is consumed (discharged) by the drive motor of the vehicle 200, and the SOC of the high voltage battery 210 decreases. The period so far is set outside the discharge permission time.

  After arrival at the office (t22), the discharge of the high voltage battery 210 is started when the outside air temperature Ta becomes equal to or higher than the threshold Ta_th (t24) in the discharge permission time period (t23 to t27), and the SOC is Decreases rapidly. When the SOC of the high voltage battery 210 is lowered to a predetermined level (t25), the discharge is terminated, and the SOC of the high voltage battery 210 is held at the predetermined level as it is. Thereafter, when the outside air temperature Ta becomes less than the threshold Ta_th (t26) by the end of the discharge permission time zone (t27), the high-voltage battery 210 starts to be rapidly charged, and the SOC rapidly increases.

  When the SOC of the high voltage battery 210 reaches 100% (t27), the quick charge is finished and the SOC of the high voltage battery 210 is maintained at 100%. In the example of FIG. 6, the discharge permission time period ends simultaneously with the end of the quick charge, but the charge / discharge control is not performed because the SOC of the high voltage battery 210 is already 100%. During the evening commute (t28 to t29), power is consumed (discharged) by the drive motor of the vehicle 200, and the SOC of the high-voltage battery 210 decreases. After returning home (t29), during the night time period (t29 to t30) when the power demand is high, the power stored in the high voltage battery 210 is consumed in the house, and the SOC of the high voltage battery 210 further decreases. Then, after the end of the night time zone when the power demand is large (t30), the normal charging control of the high voltage battery 210 is executed again, and the SOC of the high voltage battery 210 is set to 100%.

  In the example of FIG. 6, the high voltage battery 210 is discharged when the outside air temperature Ta becomes equal to or higher than the threshold Ta_th, and the SOC of the high voltage battery 210 decreases. Therefore, it is possible to prevent the high voltage battery 210 from being exposed to a high temperature environment in a high SOC state. Thereby, the progress of deterioration of the high voltage battery 210 can be suppressed.

(2-1-2-2. Second example)
FIG. 7 shows another example in which discharge control is performed in conjunction with the current outside temperature Ta within the discharge permission time for the high voltage battery 210 of the vehicle 200 used for commuting. In this example, charge / discharge control similar to that in the first example shown in FIG. 6 is executed during a period from t30 (at the end of the night time period when the power demand in the house is large) to t25.

  In the second example, the discharge permission time ends before the outside air temperature Ta falls below the threshold Ta_th (t27 '). Along with this, rapid charging of the high voltage battery 210 is started, and the SOC rapidly increases. The end time of this discharge permission time is at the start of the commuting time period (t28) so that the SOC of the high voltage battery 210 can be made 100% by rapid charging by the evening commuting time period (t28 to t29). ) Is set a predetermined time before. Therefore, the SOC of the high voltage battery 210 is 100% by the start of the commuting time zone (t28).

  During the evening commute (t28 to t29), power is consumed (discharged) by the drive motor of the vehicle 200, and the SOC of the high-voltage battery 210 decreases. After returning home (t29), during the night time period (t29 to t30) when the power demand is high, the power stored in the high voltage battery 210 is consumed in the house, and the SOC of the high voltage battery 210 further decreases. Then, after the end of the night time zone when the power demand is large (t30), the normal charging control of the high voltage battery 210 is executed again, and the SOC of the high voltage battery 210 is set to 100%.

  In the example of FIG. 7, the high voltage battery 210 is discharged when the outside air temperature Ta becomes equal to or higher than the threshold Ta_th, and the SOC of the high voltage battery 210 decreases. Therefore, it is possible to prevent the high voltage battery 210 from being exposed to a high temperature environment in a high SOC state. Thereby, the progress of deterioration of the high voltage battery 210 can be suppressed. In the example of FIG. 7, after the SOC of the high voltage battery 210 is lowered, the high voltage battery 210 is rapidly charged in accordance with the scheduled use time of the vehicle 200, so that the use of the vehicle 200 is not hindered.

(2-1-2-3. Third example)
FIG. 8 shows an example in which discharge control is performed within the discharge permission time for the high-voltage battery 210 of the vehicle 200 used for commuting in the time when the average temperature Tave is equal to or higher than the average temperature threshold Tave_th. In this example, as long as the average temperature Tave exceeds the average temperature threshold Tave_th and is within the discharge permission time, the discharge control of the high voltage battery 210 is executed. Normal charge control is executed and the SOC of the high-voltage battery 210 is 100% after the end of the night time zone when the power demand in the house is large (t49) and until the morning commute time (t41). During the morning commute time (t41 to t42), electric power is consumed (discharged) by the drive motor of the vehicle 200, and the SOC of the high voltage battery 210 decreases. The period so far is set outside the discharge permission time.

  After arrival at the office (t42), at the start of the discharge permission time zone (t43), the discharge of the high voltage battery 210 is started, and the SOC rapidly decreases. When the SOC of the high voltage battery 210 decreases to a predetermined level (t44), the discharge is terminated, and the SOC of the high voltage battery 210 is held at the predetermined level as it is. Thereafter, when the discharge permission time period ends (t45), rapid charging of the high voltage battery 210 is started, and the SOC rapidly increases.

  When the SOC of the high voltage battery 210 reaches 100% (t46), the quick charge is finished and the SOC of the high voltage battery 210 is maintained at 100%. During the evening commute (t47 to t48), power is consumed (discharged) by the drive motor of the vehicle 200, and the SOC of the high voltage battery 210 is reduced. After returning home (t48), during the night time period (t48 to t49) when the power demand is high, the power stored in the high voltage battery 210 is consumed in the house, and the SOC of the high voltage battery 210 further decreases. Then, after the end of the night time zone when the power demand is high (t49), the normal charge control of the high voltage battery 210 is executed again, and the SOC of the high voltage battery 210 is set to 100%.

  In the example of FIG. 8, the SOC of the high voltage battery 210 decreases during the period when the outdoor temperature Ta during the day is high, for example, in the season when the average temperature Tave is high and the outside temperature Ta is likely to rise in the summer. To do. Therefore, it is possible to prevent the high voltage battery 210 from being exposed to a high temperature environment in a high SOC state. Thereby, the progress of deterioration of the high voltage battery 210 can be suppressed.

<2-2. Flow chart>
Next, an example of a flowchart of the discharge control process of the high voltage battery 210 executed by the charge / discharge control device 150 according to the present embodiment will be described with reference to FIGS. 9 and 10.

  First, when charging / discharging control device 150 detects the connection between vehicle 200 and charging / discharging device 100 in step S10 in FIG. 9, charging / discharging control device 150 determines in step S20 whether discharge control can be executed. .

  FIG. 10 is a flowchart illustrating an example of a discharge control execution permission determination process. First, in step S21, the charge / discharge control device 150 determines whether or not the emergency stop button 120 is off. When the emergency stop button 120 is off (S21: Yes), the charge / discharge control device 150 proceeds to step S22 and determines whether or not the discharge stop button 130 is off. When the discharge stop button 130 is off (S22: Yes), the charge / discharge control apparatus 150 proceeds to step S23 and determines whether or not the current time is within the discharge permission time.

  When the current time is within the discharge permission time (S23: Yes), that is, when all of Steps S21 to S23 are Yes, the charge / discharge control device 150 determines that the discharge control can be performed in Step S24, and discharges. The control execution possibility determination is terminated. On the other hand, when the emergency stop button 120 is on (S23: No), when the discharge stop button 130 is off (S24: No), or when the current time is outside the discharge permission time (S25: No), charge / discharge is performed. The control device 150 determines that the discharge control cannot be performed in step S25, and ends the determination of whether or not the discharge control can be performed.

  Returning to FIG. 9, when it is determined in step S20 that the discharge control can be performed (S20: Yes), the charge / discharge control device 150 proceeds to step S30 and determines whether or not the current outside air temperature Ta is equal to or higher than the threshold value Ta_th. Determine. The determination in step S30 is performed to determine whether or not the high voltage battery 210 is in a high temperature environment where deterioration can proceed, and the threshold Ta_th is set to 25 to 30 degrees, for example.

  When the outside air temperature Ta is equal to or higher than the threshold Ta_th (S30: Yes), the charge / discharge control device 150 proceeds to step S40 and determines whether or not the battery voltage Vb is equal to or higher than the upper limit voltage Vb_th1. The determination in step S40 is performed to determine whether or not the high voltage battery 210 is in a high SOC state where deterioration can proceed when placed in a high temperature environment. The threshold value Vb_th1 is, for example, an SOC of 30. It can be set as the voltage value in the range of ˜50%.

  When the battery voltage Vb is equal to or higher than the upper limit voltage Vb_th1 (S40: Yes), the charge / discharge control device 150 proceeds to step S50 and executes a discharge process of the high voltage battery 210. Here, the charge / discharge control device 150 discharges the high-voltage battery 210 and quickly reduces the SOC of the high-voltage battery 210. After executing the discharging process of the high voltage battery 210, the process returns to step S10, and the process of each step described so far is repeated.

  On the other hand, when the battery voltage Vb is less than the upper limit voltage Vb_th1 (S40: No), the charge / discharge control device 150 proceeds to step S60 and determines whether or not the battery voltage Vb is equal to or higher than the minimum voltage Vb_th2. The determination in step S60 is performed so that the SOC of the high-voltage battery 210 is not completely zero, and the threshold value Vb_th2 is, for example, a voltage value when the SOC is within a range of 5 to 10%. Can do.

  When the battery voltage Vb exceeds the minimum voltage Vb_th2 (S70: No), the charge / discharge control device 150 maintains the current state of charge control or discharge control. Then, it returns to step S10 and repeats the process of each step demonstrated so far.

  Furthermore, the charge / discharge control apparatus 150 determines that the discharge control cannot be performed in step S20 described above (S20: No), or if the current outside air temperature Ta is less than the threshold Ta_th in step S30 (S30: In No), the process proceeds to step S80, and the charging process to the high voltage battery 210 is executed. At this time, when the high voltage battery 210 is charged after the discharge control is performed, the charge / discharge control device 150 performs rapid charging. As a result, the SOC of high voltage battery 210 can be quickly raised before vehicle 200 is used.

  As described above, according to the charge / discharge control device 150 according to the present embodiment, the discharge control of the high-voltage battery 210 is performed when the outside temperature Ta can rise while the high-voltage battery 210 is in a high SOC state. The Therefore, the high voltage battery 210 can be prevented from being exposed to a high temperature environment in a high SOC state, and the progress of deterioration of the high voltage battery 210 can be suppressed. Moreover, the charge / discharge control apparatus 150 concerning this embodiment can set the discharge permission time which can perform discharge control. Therefore, the SOC of high voltage battery 210 can be raised at the start of use of vehicle 200 in consideration of the planned use of vehicle 200.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can make various modifications or application examples within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

  For example, although the power system 10 according to the above embodiment includes one charging / discharging device 100, the number of the charging / discharging devices 100 is not limited to one. For example, when the power system 10 includes a building power system 300 and a charge / discharge device 100 at work, a plurality of charge / discharge devices 100 may be provided. In this case, all the charge / discharge devices 100 may include the charge / discharge control device 150 described above, or some of the charge / discharge devices 100 may include the charge / discharge control device 150 described above.

  Moreover, in said embodiment, although the charging / discharging control apparatus 150 is provided in the charging / discharging apparatus 100, it is not restricted to this example. For example, the charge / discharge control device 150 may be provided in the building power system 300. In this case, the charge / discharge control device 150 may be a function of the power management control device 350. Or each part which comprises the charge / discharge control apparatus 150 may be divided and provided in the battery management apparatus 250 of the vehicle 200, or the electric power management control apparatus 350 of the building power system 300.

  Moreover, in said embodiment, although the temperature sensor 140 for detecting the external temperature Ta is provided in the charging / discharging apparatus 100, it is not restricted to this example. For example, the charge / discharge control device 150 may acquire detection information of a temperature sensor provided in the vehicle 200. Alternatively, the charge / discharge control device 150 may acquire detection information of a temperature sensor provided in the building power system 300.

  Further, in the above-described embodiment, when charging / discharging control device 150 charges high-voltage battery 210 after executing discharge control, it is rapidly charged until the SOC of high-voltage battery 210 reaches 100%. It is not limited to examples. For example, the charge / discharge control device 150 may store the battery voltage Vb at the start of discharge, and charge the battery voltage Vb at the time of recharging.

  Further, in the above embodiment, after the discharge of the high voltage battery 210, when the outside air temperature Ta becomes less than the threshold Ta_th, when the discharge permission time ends, or when a predetermined time before the scheduled use time of the vehicle 200 comes The high voltage battery 210 is rapidly charged when the emergency stop button 120 or the discharge stop button 130 is pressed, but the present invention is not limited to this example. For example, when connected to the charging / discharging device 100 at work, when the user of the vehicle 200 performs a process based on the assumption that he / she is going home, such as a work-out process or a log-off process of a personal computer, You may perform quick charge.

DESCRIPTION OF SYMBOLS 10 Electric power system 100 Charging / discharging apparatus 110 Power transmission / reception connection part 120 Emergency stop button 130 Discharge stop button 140 Temperature sensor 150 Charging / discharging control apparatus 150 Power management control apparatus 152 Connection detection part 154 Temperature detection part 156 Voltage detection part 158 Discharge availability determination part 160 discharge permission time setting unit 170 charge / discharge control unit 200 vehicle 210 high voltage battery 250 battery control device 300 building power system 310 distribution board 320 power storage unit 350 power management control device Ta outside temperature Tave average temperature Vb battery voltage

Claims (11)

In the on-board battery charge / discharge control device that performs the discharge control for outputting the electric power of the in-vehicle battery to the outside of the vehicle, and the charge control for inputting the electric power from the outside of the vehicle to the on-vehicle battery,
A connection detection unit for detecting connection between the vehicle and a charge / discharge device outside the vehicle;
In a state where the connection is detected, when the ambient temperature is equal to or higher than a predetermined threshold, a charge / discharge control unit that executes discharge control,
An in-vehicle battery charge / discharge control device.   The charge / discharge control device for an in-vehicle battery according to claim 1, wherein the charge / discharge control unit maintains the charge state of the in-vehicle battery at a predetermined level after the execution of the discharge control.   The on-vehicle battery charge / discharge control device according to claim 1, wherein the charge / discharge control unit executes the discharge control within a preset discharge permission time.   The charge / discharge control device for an in-vehicle battery according to claim 3, wherein the charge / discharge control unit starts charging the in-vehicle battery when the end time of the discharge permission time comes after execution of the discharge control. .   The charge / discharge control device for an in-vehicle battery according to any one of claims 1 to 4, wherein the charge / discharge control unit executes the discharge control when a current air temperature is equal to or higher than a predetermined temperature threshold.   6. The charge / discharge control unit executes the discharge control when an average value of the current temperature over the last few days is equal to or greater than a predetermined average temperature threshold even if the current temperature is less than the threshold. The charging / discharging control apparatus of the vehicle-mounted battery of description.   The charge / discharge control unit is configured to perform the discharge control when the ambient temperature falls below the threshold value or when a predetermined time before a predetermined vehicle use scheduled time comes. The charging / discharging control apparatus of the vehicle-mounted battery of any one of Claims 1-6 which starts charge to. The outside of the vehicle is a power system of a power management system provided in a house or office,
The on-vehicle vehicle according to any one of claims 1 to 7, wherein the charge / discharge control unit starts charging the in-vehicle battery based on an action history of a user of the vehicle after the execution of the discharge control. Battery charge / discharge control device.   The charge / discharge control device for an in-vehicle battery according to any one of claims 1 to 8, wherein the charge / discharge control unit starts charging the in-vehicle battery when receiving an input of a discharge stop operation.   The on-vehicle battery charge / discharge control device according to claim 1, wherein the discharge permission time is set based on a power cost. The charging / discharging control apparatus of the vehicle-mounted battery of any one of Claims 1-10,
A power transmission / reception connecting portion electrically connected to the vehicle;
An in-vehicle battery charging / discharging device.

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