JP2019129542A - Charge control device of electric vehicle - Google Patents

Abstract

To provide a charge control device of a vehicle capable of protecting a battery by restraining an excessive voltage from being applied to the battery under charging.SOLUTION: An electric vehicle 1 comprises a chargeable battery 2, a heater 71 operated by power of the battery 2, and a controller 8 for performing charge control of the battery 2 and operation control of the heater 71. When a command for stopping the heater 71 is outputted during charging to the battery 2 from an external power source, the controller 8 can execute a first stop mode in which current used in the heater 71 is gradually decreased to stop the heater 71.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a charge control device of a vehicle that can use an air conditioner while charging, in an electric vehicle including a battery that can be charged from an external power supply and an air conditioner.

  A battery (secondary battery) mounted on an electric vehicle such as an electric vehicle or a plug-in hybrid vehicle is charged by being supplied with power by, for example, ordinary charging using a household power source or rapid charging using a dedicated power source.

  An electric vehicle having a function of operating an air conditioner while charging a battery is also known. Such a function allows the user to comfortably stand in the vehicle compartment until charging is completed.

JP 2010-183679 A JP 2009-177886 A

  Here, when the air conditioner is operated while charging the battery, the power of the air conditioner is supplied from the charging current. For this reason, if the operation of an air conditioner, especially a heater with a large amount of power consumption, is stopped during charging, the current used by the heater of the air conditioner is applied to the battery, and an overvoltage that instantaneously exceeds the upper limit voltage is used. There is a possibility that the voltage may be applied to the battery, and there is a problem that the over voltage causes deterioration or failure of the battery.

  An object of the present invention is to provide a vehicle charge control device capable of protecting a battery by suppressing the application of an overvoltage to the battery being charged.

  An aspect of the present invention that solves the above problems includes a battery that is mounted on an electric vehicle and can be charged, a heater that is operated by the electric power of the battery, a control device that performs charge control on the battery and operation control of the heater, The control device gradually lowers the current used by the heater and stops the heater when a command to stop the heater is issued during charging of the battery by the external power supply. According to another aspect of the present invention, there is provided a charge control device for an electrically powered vehicle, characterized in that the first stop mode is executable.

  In such a mode, when the stop command of the heater is issued during charging of the battery from the external power supply, the moment is performed by executing the first stop mode in which the current used by the heater is gradually reduced and stopped. It is possible to suppress the application of the overvoltage exceeding the upper limit voltage of use to the battery, and to suppress the deterioration or failure of the battery due to the overvoltage. Moreover, compared with the case where the charging of the battery is stopped after detecting the overvoltage, the occurrence of the overvoltage can be suppressed, so that the overvoltage can be more reliably suppressed from being applied to the battery.

  Here, it is preferable to further include a blowing unit that blows the gas warmed by the heater, and to immediately stop the blowing unit in the first stop mode. According to this, even if the heater continues heating, by stopping the blowing means, it is possible to suppress the user in the electric vehicle from erroneous recognition.

  In the first stop mode, it is preferable that the current used by the heater is gradually reduced by gradually reducing the output current of the heater. According to this, when the heater is stopped, the output current of the heater can be gradually decreased to suppress the application of the overvoltage to the battery.

  Further, in the first stop mode, the heater is immediately stopped and the electrical component other than the heater is used by the heater in the electrical component that operates at a current lower than the consumption current of the heater. It is preferable to use a part of the current and to stop the electrical components later than the stop of the heater. According to this, the current used in the heater is used in other electrical components, so that the current used in the heater can be gradually reduced to prevent the overvoltage from being applied to the battery. it can.

  Preferably, the output current of the electrical component is gradually decreased to stop the electrical component. According to this, it is possible to reliably suppress the application of the overvoltage to the battery when the electrical component is stopped.

  Moreover, it is preferable that the said control apparatus can perform 2nd stop mode which stops the said heater immediately by stop instruction | command of the said heater. According to this, when it is difficult to apply an overvoltage to the battery, by executing the second stop mode, wasteful consumption of current can be suppressed and the charging time can be shortened.

  The control device may further include a charge state measurement unit that measures a charge state of the battery, and the control device may perform the first stop mode and the second stop mode based on the charge state of the battery measured by the charge state measurement unit. It is preferable to select and execute. According to this, the first stop mode can be reliably executed when the overvoltage is easily applied to the battery, and the second stop mode can be executed when the overvoltage is difficult to be applied, and the overvoltage is applied to the battery. As well as suppressing unnecessary consumption of current, charging time can be shortened.

  The control apparatus further comprises cell voltage measuring means for measuring a cell voltage of the battery, and the control device is configured to perform the first stop mode and the second stop mode based on the cell voltage of the battery measured by the cell voltage measuring means. It is preferable to select and execute. According to this, the first stop mode can be reliably executed when the overvoltage is easily applied to the battery, and the second stop mode can be executed when the overvoltage is difficult to be applied, and the overvoltage is applied to the battery. As well as suppressing unnecessary consumption of current, charging time can be shortened.

  The control apparatus may further include a deterioration state measurement unit configured to measure a deterioration state of the battery, and the control device may perform the first stop mode and the second stop mode based on the deterioration state of the battery measured by the deterioration state measurement unit. It is preferable to select and execute. According to this, the first stop mode can be reliably executed when the overvoltage is easily applied to the battery, and the second stop mode can be executed when the overvoltage is difficult to be applied, and the overvoltage is applied to the battery. Can be suppressed, and wasteful consumption of current can be suppressed to shorten the charging time.

  The control apparatus may further comprise temperature measurement means for measuring the temperature of the battery, and the control device may select one of the first stop mode and the second stop mode based on the temperature of the battery measured by the temperature measurement means. It is preferable to execute. According to this, the first stop mode can be reliably executed when the overvoltage is easily applied to the battery, and the second stop mode can be executed when the overvoltage is difficult to be applied, and the overvoltage is applied to the battery. As well as suppressing unnecessary consumption of current, charging time can be shortened.

  According to the present invention, even if the heater is stopped while charging the battery from the external power supply, the application of the overvoltage exceeding the use upper limit voltage to the battery is suppressed, and the charging of the electric vehicle is performed with the battery deterioration and failure suppressed. A control device can be realized.

It is a figure which shows schematic structure of the charge control apparatus of the electric vehicle which concerns on Embodiment 1 of this invention. It is a functional block diagram of a control device concerning Embodiment 1 of the present invention. It is a flowchart explaining the control method of the charge control apparatus which concerns on Embodiment 1 of this invention. It is a flowchart explaining the modification of the control method of the charge control apparatus which concerns on Embodiment 1 of this invention. It is a functional block diagram of a control device concerning Embodiment 2 of the present invention. It is a flowchart explaining the control method of the charge control apparatus which concerns on Embodiment 2 of this invention.

Hereinafter, the present invention will be described in detail based on embodiments.
(Embodiment 1)
FIG. 1 is a diagram showing a schematic configuration of a charge control device for an electric vehicle according to Embodiment 1 of the present invention, and FIG. 2 is a functional block diagram of the control device.

  As shown in FIG. 1, the electric vehicle 1 of the present embodiment is an electric vehicle (EV) or a plug-in hybrid vehicle (PHEV), is a secondary battery that can be charged, and electric power from the battery 2. A traveling motor 3 which is an electric motor operated by supply is provided. The traveling motor 3 is connected to a drive wheel (in the present embodiment, a front wheel) 5 via a drive mechanism 4.

  The battery 2 can be charged by an external power source. Specifically, battery 2 is charged by ordinary charging with power from a household power supply or the like as an external power supply or rapid charging using a dedicated power supply as an external power supply. Such charging of the battery 2 is controlled by the control device 8.

  When the user of the electric vehicle 1 charges the battery 2, the user connects the external power supply and the battery 2 to charge the battery 2. The electric vehicle 1 is provided with a charging port (inlet) 6 to which a power feeding connector connected to an external power source is connected. Between the charging port 6 and the battery 2, an on-board charger (OBC: On Board Charger). 9 is provided.

  The electric vehicle 1 is equipped with an air conditioner 7 that operates using the battery 2 as a power source. The air conditioner 7 is generally used for vehicles, and has a heater 71 used for heating. Examples of the heater 71 of the air conditioner 7 include an electric hot water heater, a heating element such as a nichrome wire or carbon fiber, a halogen lamp, and the like. In the present embodiment, an electric hot water heater is provided as the heater 71. The air conditioner 7 is controlled by the control device 8, and the control device 8 controls the operation or stop of the air conditioner 7 by the operation of the user.

  A charge control device 10 is mounted on such an electric vehicle 1. In the present embodiment, the charge control device 10 includes the battery 2, the air conditioner 7 and the control device 8.

  The control device 8 is a device that performs comprehensive control of the electric vehicle 1. The control device 8 is configured as, for example, an LSI device or a built-in electronic device in which a microprocessor, a ROM, a RAM, and the like are integrated, and is connected to a communication line of an in-vehicle network provided in the electric vehicle 1.

  The control device 8 includes an air conditioning control unit 81 that performs operation control of the air conditioner 7 and a charge control unit 82 that performs charge control of the battery 2 as control of the electric vehicle 1.

  The air conditioning control unit 81 controls the operation or stop of the air conditioner 7, and controls the air volume, the air direction, the temperature, and the like. For example, a button for operating or stopping the air conditioner 7 is provided in the passenger compartment of the electric vehicle 1. The air conditioning control unit 81 detects that the user operates the button, and operates or stops the air conditioner 7 according to the state of the button. In addition, various buttons for setting the air volume, air direction, temperature, and the like of the air conditioner 7 are provided in the passenger compartment, and the air conditioning control unit 81 determines whether the air conditioner 7 is in accordance with the operation of these buttons by the user. Set the air volume, wind direction, temperature, etc. That is, the heater 71 of the air conditioner 7 is operated or stopped by the operation of the air conditioner 7 by the user. In addition, the air conditioning control unit 81 may have a temperature detection unit such as a temperature sensor that detects the temperature in the vehicle interior. For example, when the actual temperature detected by the temperature detection means reaches the temperature set by the user, the air conditioning control unit 81 stops the heater 71. When the temperature falls below the user set temperature, the air conditioning control unit 81 The heater 71 is operated.

  The charge control unit 82 controls the on-vehicle charger 9 to control the charging of the battery 2 by the power supplied from the external power supply.

  In addition, when the stop command for stopping the heater 71 of the air conditioner 7 is issued to the air conditioning control unit 81 while the external charge to the battery 2 is being performed from the external power supply, the air conditioning control unit 81 controls the heater 71 to stop. It is possible to execute a first stop mode of stopping the heater 71 by gradually reducing the current being used.

  Here, gradually decreasing the current used by the heater 71 means gradually decreasing the current used by the heater 71 within a predetermined time from the stop command of the heater 71. That is, in general, when the heater 71 is to be stopped, it is performed by interrupting the current supplied to the heater 71 by the switch. In the present embodiment, the current used in the heater 71 is immediately cut off by the stop command of the heater 71 to make the current zero (0) is referred to as a second stop mode. On the other hand, in the first stop mode, the current used in the heater 71 is not immediately cut off but the current is gradually decreased within a predetermined time. The time during which the current in the first stop mode is gradually decreased may be a time that does not instantaneously apply an overvoltage to the battery 2 and is, for example, 0.1 seconds or longer. Further, if the time for gradually decreasing the current in the first stop mode is too long, consumption of unnecessary current is increased and the charging time of the battery 2 is extended. Therefore, a time as short as possible is preferable. One second or less is preferable.

  That is, in the first stop mode, the heater 71 is immediately stopped after receiving a stop instruction of the heater 71 during external charging. For example, in this embodiment, the heater 71 is not stopped in a time shorter than 0.1 seconds. After receiving the command, the current used in the heater 71 is gradually decreased, and the consumption current of the heater 71 is set to 0 (zero) for 0.1 second or more and 1 second or less.

  Note that gradually decreasing the current used in the heater 71 includes gradually decreasing the current used in the heater 71 by gradually decreasing the output current of the heater 71. That is, the output current of the heater 71 is gradually reduced to 0 (zero) for 0.1 seconds or more and 1 second or less.

  In addition, to gradually reduce the current consumption of the heater 71, the heater 71 is immediately stopped and the current used in the heater 71 is used in electrical equipment other than the heater 71, and the electrical equipment is delayed from the stop of the heater 71. Including stopping. Such electrical components other than the heater 71 refer to electrical devices mounted on the electric vehicle 1, for example, a charger such as a DCDC converter for charging the auxiliary battery, a motor generator for cranking, a seat A heater etc. are mentioned. In addition, it is preferable that the electrical component operate with a current smaller than the current consumption of the heater 71.

  Then, the heater 71 is stopped by a stop command of the heater 71, and a part of the current used by the heater 71 is used by electrical components other than the heater 71, and the heater 71 is used at the timing when the heater 71 is stopped. Only a portion of the current that has not been used in the electrical component is instantaneously applied to the battery 2. Therefore, compared to the case where all of the current used by the heater 71 is applied to the battery 2, the current applied to the battery 2 is reduced, and the overvoltage is less likely to be applied to the battery 2. Moreover, after stopping the heater 71, by stopping the electrical component in 0.1 second or more and 1 second or less, the current used in the electrical component flows instantaneously to the battery 2 side. Since the current used in this electrical component is a current lower than the current used in the heater 71, the battery compared to the case where all of the current used in the heater 71 is applied to the battery 2, The current applied to 2 is reduced, and an overvoltage is hardly applied to the battery 2. That is, a part of the current used in the heater 71 after the heater 71 is stopped is used in the electrical component, and then the electrical component is stopped after a predetermined time. Decreases in steps. As described above, to gradually reduce the consumption current of the heater 71, the current supplied to the heater 71 from the external power supply may be gradually reduced in two or more steps.

  In the first stop mode, when the electrical components other than the heater 71 are stopped, the current used for the electrical components other than the heater 71 may be gradually decreased. As a result, even when the electrical components other than the heater 71 are stopped, it is difficult to apply an overvoltage to the battery 2.

  Furthermore, in the present embodiment, the electrical component preferably operates with a current lower than the consumption current of the heater 71. For example, the electrical component has the same current as the consumption current of the heater 71 or higher than the heater 71 It may operate with current. If the current consumption of the electrical component is greater than or equal to the current consumption of the heater 71, the current used in the electrical component may be gradually reduced when the electrical component is stopped.

  In addition, when operating electrical components other than the heater 71 in the first stop mode, only one electrical component may be operated, or two or more electrical components may be operated. Good. At this time, the total current consumption of the plurality of electrical components may be equal to or greater than the current consumption of the heater 71. When operating a plurality of electrical components, the current used for the heater 71 can be reduced stepwise by the number of electrical components by shifting the stop timing of the plurality of electrical components.

  As described above, the charge control unit 82 executes the first stop mode in which the current used by the heater 71 is gradually decreased when the heater 71 of the air conditioner 7 is stopped while the battery 2 is being charged by the external power supply. Thus, it is possible to suppress the application of an overvoltage exceeding the use upper limit voltage to the battery 2. Incidentally, when the heater 71 of the air conditioner 7 is used while the battery 2 is being charged by the external power supply, power is supplied to the heater 71 from the external power supply. For this reason, when the heater 71 of the air conditioner 7 stops, the electric power used by the heater 71 is instantaneously supplied to the battery 2 side, and there is a possibility that an overvoltage exceeding the upper limit voltage for use may be applied to the battery 2. By being applied, deterioration or failure of the battery 2 occurs. In the present embodiment, in the first stop mode, when the heater 71 is stopped, the power used by the heater 71 is gradually reduced, so that an overvoltage exceeding the upper limit voltage is instantaneously applied to the battery 2. Can be suppressed, and deterioration and failure of the battery 2 can be reduced.

  Incidentally, a method of stopping the charging of the battery 2 after measuring the charging current and detecting the overvoltage to the battery 2 is also conceivable. However, since the charging is stopped after the overvoltage is detected, the reaction speed is slow, and the battery 2 may be applied with an overvoltage. Since the current used by the heater 71 is reduced and stopped, instantaneous application of overvoltage to the battery 2 can be reliably suppressed.

  In the present embodiment, the charge control unit 82 executes the first stop mode when the stop command of the heater 71 used for heating with a large consumption current of the air conditioner 7 is issued, but in particular It is not limited. For example, since the cooling of the air conditioner 7 consumes less current than the heating using the heater 71, it is difficult to instantaneously apply an overvoltage to the battery 2 even if the cooling is stopped, but the cooling of the air conditioner 7 is stopped. At the time of charging, the charge control unit 82 may execute the stop mode in which the current used in the air conditioner 7 is gradually reduced.

  The heater 71 of the air conditioner 7 is not limited to a heat source used for convection heating that warms the air in the electric vehicle 1. For example, the heater 71 is a heat source used for radiation heating or a heat source used for conduction heating such as a seat heater. There may be.

  Here, the control method of the charge control apparatus 10 of such an electric vehicle is demonstrated with reference to FIG. FIG. 3 is a flowchart for explaining a charging control method.

  First, in step S1, it is determined whether or not external charging in which the battery 2 is charged is started by the current from the external power source, and when external charging is started (step S1; Yes), the air conditioner 7 is selected in step S2. It is determined whether the heater 71 is turned on. In addition, if external charge is not started (step S1; No), step S1 is repeated until external charge is started.

  When it is determined in step S2 that the heater 71 of the air conditioner 7 is turned on (step S2; Yes), it is determined whether or not the stop (off) command of the heater 71 of the air conditioner 7 is output in step S3. If the heater 71 of the air conditioner 7 is not operated (turned on) in step S2 (step S2; No), step S2 is repeated until the heater 71 of the air conditioner 7 is operated.

  If it determines with the stop instruction | command of the heater 71 of the air conditioner 7 having been issued by step S3 (step S3; Yes), the charge control part 82 will be a blower which is a ventilation means which ventilates the warm gas of the air conditioner 7 by step S4. Turn off. Thereby, even if the heater 71 is not stopped, the air heated by the heater 71 is not blown into the electric vehicle 1, so that the user in the electric vehicle 1 issues a stop command to the heater 71. Otherwise, it becomes difficult to misunderstand and convenience improves. Next, in step S5, the charge control unit 82 gradually reduces the output current of the heater 71, and completely stops (turns off) the heater 71 in step S6. When the stop command of the heater 71 is not issued in step S3 (step S3; No), step S3 is repeated until the stop command of the heater 71 is issued.

  As described above, in the charging control device 10 of the present embodiment, when the heater 71 of the air conditioner 7 is instructed to stop when the battery 2 is externally charged from the external power source, the heater 71 is completely stopped immediately ( Instead of cutting off the current), the output current of the heater 71 is gradually reduced and stopped, so that the current flowing in the heater 71 of the air conditioner 7 stops the heater 71 and instantaneously the battery 2 Thus, it is possible to suppress the overvoltage exceeding the upper limit voltage of the battery 2 from being applied to the battery 2, and it is possible to suppress deterioration and failure due to the overvoltage of the battery 2.

  In the present embodiment, in the first stop mode, the charging control apparatus 10 gradually decreases the output current of the heater 71. However, the present invention is not particularly limited thereto, and as described above, the charging control apparatus 10 When the stop command for the heater 71 is issued, the current used for the heater 71 may be gradually decreased by using the current used for the heater 71 for other electrical components. . Such an example is shown in FIG. FIG. 4 is a flowchart for explaining a modification of the charging control method of the present embodiment.

  As shown in FIG. 4, steps S1 to S3 similar to FIG. 3 described above are performed. If it is determined in step S3 that a stop command for the heater 71 has been issued (step S3; Yes), the heater 71 is immediately stopped (off), that is, the current of the heater 71 is cut off in step S8. In step S <b> 9, the current used by the heater 71 is supplied to an electrical component other than the heater 71 that operates at a current lower than the current consumed by the heater 71. Thereby, a current lower than the current used in the heater 71 is consumed by the electrical component. As a result, only the current that was not used by the electrical components other than the heater 71 among the current used by the heater 71 is instantaneously applied to the battery 2, so that an overvoltage exceeding the upper limit of use voltage is applied to the battery 2. It is hard to be done. That is, when the heater 71 is stopped, the current used in the heater 71 is instantaneously applied to the battery 2, and even if an overvoltage is applied to the battery 2, the current is used in the heater 71. By using the current in other electrical components, the current instantaneously applied to the battery 2 can be reduced, and the overvoltage can be suppressed from being applied to the battery 2.

  Then, in step S10, the electrical components are stopped after the heater 71 is stopped. Thereby, the current used in the electrical component may be instantaneously applied to the battery 2, but the current used in the electrical component is lower than the current used in the heater 71. Therefore, it is difficult to apply an overvoltage to the battery 2 even if the electrical component is stopped.

  As described above, in the charging control device 10 of the present embodiment, when the heater 71 of the air conditioner 7 is instructed to stop when the battery 2 is externally charged from the external power source, the heater 71 is completely stopped immediately ( Rather than interrupting the current), the output current of the heater 71 is used in electrical equipment other than the heater 71, and the current consumed by the heater 71 is gradually reduced to flow to the heater 71 of the air conditioner 7. The current that has flowed instantaneously flows to the battery 2 by stopping the heater 71, and it is possible to suppress the overvoltage exceeding the upper limit voltage of the battery 2 from being applied to the battery 2. Deterioration and failure can be suppressed.

  In addition, when stopping the electrical component in step S10, the output current of the electrical component may be gradually decreased. Thereby, when stopping an electrical component, it can further suppress that the electric current used with the electrical component flows into the battery 2 instantaneously, and an overvoltage is applied to the battery 2. FIG.

Second Embodiment
FIG. 5 is a functional block diagram of a control device according to a second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member similar to embodiment mentioned above, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 5, as the control of the electric vehicle 1, the control device 8 controls the operation of the air conditioner 7, the charge control unit 82 that controls the charge of the battery 2, and the charge state of the battery 2 ( A state-of-charge measurement unit 83 for measuring SOC (State of Charge) and a temperature measurement unit 84 for measuring the temperature of the battery 2 are provided.

  The charge state measurement unit 83 acquires the charge state (SOC: State Of Charge) of the battery 2. Such a charge state measurement unit 83 is, for example, based on the cell voltage from the cell monitoring unit (CMU) provided for each of a plurality of battery modules provided in the battery 2, the current from the current sensor, etc. A state of charge (SOC) indicating the remaining capacity is calculated. That is, a cell monitoring unit, a current sensor, and a charge state measurement unit 83 are provided as charge state measurement means for measuring the charge state of the battery 2. The state of charge (SOC) of the battery 2 is a value representing the percentage of the remaining capacity with respect to the full charge capacity of the battery 2 as a percentage, and SOC = {remaining capacity (Ah) / full charge capacity (Ah)} × 100. It can be calculated by the following formula. Further, the control device 8 may function as a deterioration state measuring means, and a battery management unit (BMU) for calculating the charge state of the battery 2 is provided separately from the control device 8, and the charge of the battery 2 calculated by the battery management unit is provided. The control device 8 may receive information indicating the state.

  The temperature measuring unit 84 acquires the temperatures of a plurality of battery modules constituting the battery 2. The temperature measurement unit 84 acquires temperature information from a cell monitoring unit (CMU) provided for each battery module of the battery 2. That is, a cell monitoring unit and a temperature measuring unit 84 are provided as temperature measuring means for measuring the temperature of the battery 2.

  The charge control unit 82 is supplied from an external power source by controlling the in-vehicle charger 9 based on the charge state of the battery 2 acquired by the charge state measurement unit 83, the temperature of the battery 2 acquired by the temperature measurement unit 84, and the like. The charging of the battery 2 by electric power is controlled.

  In addition, the charging control unit 82, when a stop command for stopping the heater 71 of the air conditioner 7 is issued to the air conditioning control unit 81 while external charging from the external power source to the battery 2 is being performed, In 81, it is possible to execute a first stop mode in which the current used by the heater 71 is gradually reduced to stop the heater 71.

  In addition, the charging control unit 82 according to the present embodiment is configured so that a stop command for stopping the heater 71 of the air conditioner 7 is issued to the air conditioning control unit 81 while external charging from the external power source to the battery 2 is performed. The air conditioning control unit 81 can execute the second stop mode in which the current used by the heater 71 is immediately set to 0 (zero) and the heater 71 is immediately stopped.

  The first stop mode and the second stop mode by the charge control unit 82 are based on, for example, the charge state of the battery 2 acquired by the charge state measurement unit 83 and the temperature of the battery 2 acquired by the temperature measurement unit 84. One of them is executed. That is, when a command to stop the heater 71 of the air conditioner 7 is issued while the battery 2 is externally charged, it is determined from the state of the battery 2 whether or not the overvoltage is applied, and it is determined that the overvoltage is applied. If it is determined that the first stop mode is performed, and if it is determined that the overvoltage is not applied, the second stop mode is performed.

  Here, the charging state of the battery 2 affects the application of the overvoltage exceeding the upper limit voltage of use of the battery 2. For example, when the remaining capacity of the battery 2 is high and the SOC is close to 100%, when the heater 71 of the air conditioner 7 is stopped, an overvoltage exceeding the use upper limit voltage of the battery 2 is easily applied instantaneously. For this reason, the charge control part 82 should just perform the 1st stop mode which reduces gradually the electric current currently used with the heater 71 based on the charge condition (SOC) of the battery 2. FIG. That is, the charging control unit 82 may perform control so that the first stop mode is performed when the SOC is greater than the predetermined threshold, and the second stop mode is performed when the SOC is equal to or less than the predetermined threshold.

  Incidentally, although the SOC of the battery 2 can be calculated by calculation by the control device 8, there is a possibility that an error occurs between the actual remaining capacity of the battery 2 and the calculated SOC at a low temperature or the like. Therefore, in addition to the SOC of the battery 2, the cell voltage (maximum value of the battery module) of the battery cell constituting the battery module provided in the battery 2 is measured, and the charge control unit 82 determines the first based on the cell voltage. It may be determined which of the stop mode and the second stop mode is to be executed. That is, the charge control unit 82 may execute the first stop mode when the cell voltage is higher than the predetermined threshold, and may execute the second stop mode when the cell voltage is lower than the predetermined threshold.

  The cell voltage can be measured, for example, by a cell monitoring unit (CMU) (not shown) provided for each of a plurality of battery modules constituting the battery 2. That is, the cell monitoring unit (CMU) corresponds to the cell voltage measuring means.

  The charge control unit 82 performs the first stop mode when at least one of the SOC of the battery 2 and the cell voltage becomes larger than the predetermined threshold set respectively, and the second stop mode when the threshold is lower than the predetermined threshold. Should be done. As a result, even if an error occurs between the actual SOC of the battery 2 and the calculated SOC, it is possible to suppress an overvoltage from being applied to the battery 2 and to perform a highly robust control. That is, for example, when the SOC calculated by the battery 2 is lower than the actual SOC, if the second stop mode is executed since the overvoltage is hard to occur, the actual SOC is high and the heater 71 is stopped. This is because an overvoltage may be applied.

  Further, the application of the overvoltage exceeding the upper limit voltage of use of the battery 2 is affected by the temperature of the battery 2. For example, when the temperature of the battery 2, that is, the temperature of the battery cell of the battery module constituting the battery 2 is too low, even when the SOC or the cell voltage is low, the heater 71 of the air conditioner 7 is stopped momentarily. An overvoltage exceeding the upper limit voltage of use of the battery 2 is easily applied. Therefore, the charge control unit 82 only needs to execute the first stop mode when the temperature of the battery 2 is equal to or lower than the predetermined threshold, and execute the second stop mode when the temperature of the battery 2 is higher than the predetermined threshold.

  In order to determine the first stop mode and the second stop mode based on the SOC and temperature of the battery 2 by the charge control unit 82, for example, the state of charge (SOC) of the battery 2 and the minimum battery module of the battery 2 are determined. A table in which the module temperature (° C.) is associated with the execution of the first stop mode of the heater 71 may be prepared and determined based on the table information.

  As described above, in the present embodiment, the charge control unit 82 is configured to perform the first stop mode and the second based on the charge state of the battery 2 acquired by the charge state measurement unit 83 and the temperature of the battery 2 acquired by the temperature measurement unit 84. One of the stop modes is selectively executed. As a result, when the heater 71 is stopped during external charging, the first stop mode is executed in a state where an overvoltage exceeding the upper limit voltage for use is easily applied to the battery 2, and the overvoltage is applied to the battery 2. Can be suppressed. In addition, by executing the second stop mode in a state in which the overvoltage is difficult to be applied, it is possible to suppress wasteful use of current and to shorten the charging time.

  Here, the control method of the charging control apparatus 10 of such an electric vehicle is demonstrated with reference to FIG. FIG. 6 is a flowchart for explaining charging control.

  Since step S1 to step S3 are the same as that of Embodiment 1 mentioned above, the overlapping description is abbreviate | omitted.

  If it determines with the stop command of the heater 71 of the air conditioning apparatus 7 having been issued by step S3 (step S3; Yes), the charge control part 82 will determine stop mode by step S11. That is, charge control unit 82 executes the first stop mode based on the charge state of battery 2 acquired by charge state measurement unit 83 and the temperature of battery 2 acquired by temperature measurement unit 84, or the second stop mode. Determine whether to execute. In the present embodiment, in step S11, the charge control unit 82 determines whether or not to execute the first stop mode.

  If it is determined in step S11 that the charge control unit 82 executes the first stop mode (step S11; Yes), in step S12, the charge control unit 82 determines that the first stop mode, that is, the first embodiment described above. Similarly, the heater 71 is stopped so that the current used by the heater 71 gradually decreases. Thereby, application of an overvoltage to the battery 2 can be suppressed. In the first stop mode, as in the first embodiment described above, the output current of the heater 71 may be gradually decreased, and the heater 71 is immediately stopped and current is supplied to electrical components other than the heater 71. The current used by the heater 71 may be gradually decreased by stopping the electrical components after the stop of the heater 71.

  When it is determined in step S11 that the charge control unit 82 does not execute the first stop mode, that is, the second stop mode is to be performed (step S11; No), in step S13, the charge control unit 82 In the second stop mode, that is, the heater 71 is immediately stopped. As a result, it is possible to suppress unnecessary power consumption and to prevent the charging time from being extended.

  In the present embodiment, the charging control device 10 executes the first stop mode in which the current used in the heater 71 is gradually reduced based on the SOC and temperature of the battery 2. The execution of the first stop mode may be determined based on only the SOC of the battery 2 without limitation to the above.

  Further, the application of the overvoltage exceeding the upper limit voltage of use of the battery 2 during the external charging also affects the deterioration state (SOH) of the battery 2.

  The deterioration state (SOH) of the battery is a percentage value of the ratio of the full charge capacity at the time of deterioration to the initial full charge capacity of the battery, and SOH = {full charge capacity at the time of deterioration (Ah) / initial full charge capacity. Charge capacity (Ah)} × 100.

  For example, when the deterioration state of the battery 2 is advanced (SOH is small), the temperature of the battery 2 is high even if the SOC of the battery 2 is smaller than when the deterioration state is not advanced (SOH is large) Also, when the heater 71 is stopped, an overvoltage exceeding the upper limit voltage of use of the battery is easily applied instantaneously. Therefore, the charging control device 10 may execute the first stop mode based on the deterioration state of the battery 2. That is, the charging control device 10 executes the first stop mode when the deterioration state of the battery 2 has progressed, that is, when the SOH expressed as a percentage of the battery 2 has become a predetermined threshold value or less, and the deterioration state of the battery 2 Is not advanced, that is, when the SOH represented by the percentage of the battery 2 is larger than a predetermined threshold value, the second stop mode may be executed. Incidentally, the deterioration state of the battery 2 can be calculated based on the cell information passed from the cell monitoring unit, the information from the leakage sensor and the current sensor. Further, the control device 8 may function as a deterioration state measuring unit of the battery 2, and a battery management unit (BMU) for calculating the deterioration state is provided separately from the control device 8, and the battery 2 calculated by the battery management unit is provided. The control device 8 may receive information indicating the deterioration state of

  That is, the determination of the first stop mode and the second stop mode may be performed based on at least one selected from the charge state (SOC or cell voltage) of the battery 2, the temperature, and the deterioration state (SOH).

(Other embodiments)
As mentioned above, although each embodiment of this invention was described, the fundamental structure of this invention is not limited to what was mentioned above.

  For example, in Embodiments 1 and 2 described above, the charging control unit 82 performs the first stop mode when the heater 71 of the air conditioner 7 is stopped during external charging, but is not particularly limited thereto. The charging control unit 82 may execute a stop mode in which the current used in the air conditioner 7 is gradually reduced even when the cooling of the air conditioner 7 is stopped during external charging.

  DESCRIPTION OF SYMBOLS 1 ... Electric vehicle, 2 ... Battery, 3 ... Motor for driving, 4 ... Drive mechanism, 5 ... Drive wheel, 6 ... Charging port, 7 ... Air-conditioner, 8 ... Control device, 9 ... In-vehicle charger, 10 ... Charge control Device, 71: heater, 81: air conditioning control unit, 82: charge control unit, 83: charge state measurement unit, 84: temperature measurement unit

Claims (10)

A rechargeable battery mounted on an electric vehicle,
A heater operated by the power of the battery;
A control device that performs charge control of the battery and operation control of the heater;
With
The control device is configured to stop the heater by gradually decreasing the current used by the heater when a command to stop the heater is issued during charging of the battery by an external power source. A charge control device for an electrically powered vehicle, characterized in that: The apparatus further comprises a blowing means for blowing a gas warmed by the heater,
The charging control device for an electric vehicle according to claim 1, wherein in the first stop mode, the blowing unit is immediately stopped.   3. The charging of the electric vehicle according to claim 1, wherein in the first stop mode, the current used by the heater is gradually decreased by gradually decreasing the output current of the heater. Control device.   In the first stop mode, the heater is immediately stopped, and the electrical component other than the heater, which is an electrical component that operates at a current lower than the current consumption of the heater, The charge control device for an electrically powered vehicle according to claim 1, wherein a part of the charge control device is used, and the electric component is stopped after a stop of the heater.   5. The charge control device for an electric vehicle according to claim 4, wherein the output current of the electrical component is gradually decreased to stop the electrical component.   The charging control device for an electric vehicle according to claim 1, wherein the control device is capable of executing a second stop mode in which the heater is immediately stopped by a stop command for the heater. . A charging state measurement unit that measures the charging state of the battery;
7. The electric motor according to claim 6, wherein the control device selects and executes the first stop mode and the second stop mode based on the state of charge of the battery measured by the state of charge measuring means. Vehicle charge control device. And a cell voltage measuring means for measuring a cell voltage of the battery,
The said control apparatus is selected and performed from the said 1st stop mode and the said 2nd stop mode based on the cell voltage of the said battery which the said cell voltage measurement means measured. Electric vehicle charging control device. It has a deterioration state measuring means for measuring the deterioration state of the battery,
9. The control device according to claim 6, wherein the control device selects and executes the first stop mode and the second stop mode based on the deterioration state of the battery measured by the deterioration state measuring unit. A charge control device for an electric vehicle according to any one of the preceding claims. A temperature measuring means for measuring the temperature of the battery;
10. The control device according to claim 6, wherein the control device selects and executes the first stop mode and the second stop mode based on the temperature of the battery measured by the temperature measuring unit. The charging control device for an electric vehicle according to one item.

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