JP2017041967A - Power storage control device and transport apparatus, and power storage control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage control device capable of performing efficient charging depending on a battery to be charged.SOLUTION: A power storage control device comprises: a first battery; a plurality of second batteries having voltage lower than that of the first battery; a power conversion unit for converting power supplied from an external power supply; voltage conversion units, the number of which is made to be equal to the number of the second batteries so that the voltage conversion units individually correspond to the plurality of second batteries, the voltage conversion units converting a voltage of power converted by the power conversion unit; and a control unit that determines a battery to be charged from the first battery and the plurality of second batteries and controls the power conversion unit and the voltage conversion units so as to charge the battery to be charged. The control unit, depending on whether the number of second batteries to be charged is singular or plural, controls the power conversion unit and the voltage conversion units so that the second batteries to be charged are charged in different charging modes of two charging modes in which respective operation of the power conversion unit and the voltage conversion units differs are different.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a power storage control device and a transport device including a first power storage device and a plurality of second power storage devices with different voltages, and a power storage control method.

  Patent Document 1 describes a battery subsystem for an electric vehicle that includes a large-capacity main battery and a small-capacity sub-battery that assumes regular replacement. The battery control device of the system appropriately moves power between the main battery and the sub-battery so that the SOC of the main battery becomes a suitable value from the viewpoint of extending the life, and the SOC setting value giving priority to the life of the main battery Use a sub battery.

JP 2014-147197 A

  The system of Patent Document 1 is intended to extend the life of the main battery by concentrating battery deterioration factors on the sub-battery, and the number of sub-batteries provided in the system is one. However, when the sub-battery is used as a direct or indirect driving power source of the electric vehicle, a configuration in which a plurality of sub-batteries are provided is desirable in order to extend the cruising distance of the electric vehicle according to the driver's request. . Moreover, the system of patent document 1 charges each battery using a charger as a process different from the movement of the electric power performed between a main battery and a sub battery. In this system, control is performed so as to preferentially charge the main battery or the sub battery, but control is not performed in terms of charging each battery efficiently. Furthermore, the number of sub-batteries is only one, and there is no description on how to efficiently charge a plurality of sub-batteries.

  The objective of this invention is providing the electrical storage control apparatus and transport apparatus which can be charged efficiently according to the electrical storage device of charge object, and the electrical storage control method.

In order to achieve the above object, the invention described in claim 1
A first battery (for example, a main battery BATm in an embodiment described later),
A plurality of second capacitors having a lower voltage than the first capacitor (for example, sub-batteries BATs1, BATs2 in the embodiments described later);
A power conversion unit (for example, a charger CHG in an embodiment described later) that converts power supplied from an external power source;
A voltage conversion unit that converts the voltage of the power converted by the power conversion unit provided in the same number as the number of the second capacitors corresponding to each of the plurality of second capacitors (for example, in an embodiment described later) VCU 101, 103),
A control unit (for example, described later) that controls the power conversion unit and the voltage conversion unit so as to determine a storage target storage device from among the first storage unit and the plurality of second storage units and charge the storage target storage unit. ECU 107) in the embodiment of
The control unit is charged in different charging modes depending on whether the number of the second capacitors to be charged is one or more of two charging modes in which the operations of the power conversion unit and the voltage conversion unit are different. It is an electrical storage control apparatus which controls the said power converter and the said voltage converter so that the said 2nd electrical storage device may be charged.

The invention according to claim 2 is the invention according to claim 1,
The two charging modes include a first charging mode for applying a constant voltage to a capacitor to be charged, and a second charging mode for supplying a constant current to the capacitor to be charged.
The control unit controls to charge the second capacitor to be charged in the first charging mode when the capacitor to be charged is a plurality of the second capacitors.

In the invention according to claim 3, in the invention according to claim 2,
The constant voltage obtained in the first charging mode is generated by the control unit controlling the power conversion unit.

The invention according to claim 4 is the invention according to any one of claims 1 to 3,
The two charging modes include a first charging mode for applying a constant voltage to a capacitor to be charged, and a second charging mode for supplying a constant current to the capacitor to be charged.
The controller controls to charge the second capacitor to be charged in the second charging mode when the capacitor to be charged is a single second capacitor.

The invention according to claim 5 is the invention according to claim 4,
The constant current obtained in the second charging mode is generated by the control unit controlling the power conversion unit or the control unit controlling the voltage conversion unit,
The control unit generates the constant current by controlling the power conversion unit or the voltage conversion unit according to a remaining capacity of the single second battery to be charged.

The invention according to claim 6 is the invention according to claim 5,
If the remaining capacity of the single second battery to be charged is less than a threshold, the control unit controls the power conversion unit to generate the constant current.

In the invention according to claim 7, in the invention according to claim 5 or 6,
The control unit controls the voltage conversion unit to generate the constant current if the remaining capacity of the single second battery to be charged is equal to or greater than a threshold value.

The invention according to claim 8 is the invention according to claim 4,
The constant current obtained in the second charging mode is generated by the control unit controlling the power conversion unit or the control unit controlling the voltage conversion unit,
The control unit generates the constant current by controlling the power conversion unit or the voltage conversion unit according to the voltage of the single second battery to be charged.

The invention according to claim 9 is the invention according to claim 8,
If the voltage of the single second battery to be charged is less than a threshold value, the control unit controls the power conversion unit to generate the constant current.

In the invention according to claim 10, in the invention according to claim 8 or 9,
The control unit controls the voltage conversion unit to generate the constant current if the voltage of the single second battery to be charged is equal to or higher than a threshold value.

  The invention according to claim 11 is a transportation device having the power storage control device according to any one of claims 1 to 10.

The invention according to claim 12
A first battery (for example, a main battery BATm in an embodiment described later),
A plurality of second capacitors having a lower voltage than the first capacitor (for example, sub-batteries BATs1, BATs2 in the embodiments described later);
A power conversion unit (for example, a charger CHG in an embodiment described later) that converts power supplied from an external power source;
A voltage conversion unit that converts the voltage of the power converted by the power conversion unit provided in the same number as the number of the second capacitors corresponding to each of the plurality of second capacitors (for example, in an embodiment described later) VCU 101, 103),
A control unit (for example, described later) that controls the power conversion unit and the voltage conversion unit so as to determine a storage target storage device from among the first storage unit and the plurality of second storage units and charge the storage target storage unit. An electric storage control method performed by an electric storage control device comprising:
The control unit is charged in different charging modes depending on whether the number of the second capacitors to be charged is one or more of two charging modes in which the operations of the power conversion unit and the voltage conversion unit are different. It is an electrical storage control method which controls the said power converter and the said voltage converter so that the said 2nd electrical storage device may be charged.

  According to the invention of claim 1, the invention of claim 11 and the invention of claim 12, the second capacitor to be charged is charged in different charging modes depending on whether the number of second capacitors to be charged is singular or plural. Is done. For this reason, in terms of energy efficiency, when the number of second capacitors to be charged is singular, the second capacitor is charged in a charging mode suitable for this case, and in a plurality of cases, the charging mode suitable for this case. be able to. That is, efficient charging according to the number of second capacitors to be charged is possible.

  According to the second aspect of the present invention, if the capacitor to be charged is a plurality of second capacitors, the plurality of second capacitors are charged in the first charging mode, but charging in the first charging mode is performed at a constant voltage. Therefore, the control at the time of charging the second capacitor can be stably performed.

  According to the invention of claim 3, since the constant voltage obtained by controlling the power converter is applied to each of the plurality of second capacitors to be charged, the voltage converter corresponding to each second capacitor is There is less energy loss compared to the case where each generates a constant voltage. Thus, when charging a plurality of second capacitors, it is more efficient to generate a constant voltage by controlling the power converter.

  According to the invention of claim 4, if the capacitor to be charged is a single second capacitor, the single second capacitor is charged in the second charging mode, but charging in the second charging mode is performed at a constant current. Therefore, the efficiency when charging the second capacitor can be improved.

  According to the invention of claim 5, when a single second battery is charged in the second charging mode, the conversion unit that generates a constant current varies depending on the remaining capacity of the second battery. For this reason, charging in the second charging mode can be performed by performing control suitable for the remaining capacity of the second battery in terms of energy efficiency on the power conversion unit or the voltage conversion unit.

  According to the sixth aspect of the present invention, if the remaining capacity of the single second battery to be charged is less than the threshold value, charging in the second charging mode is performed by generating a constant current by controlling the power conversion unit. Is called. When the number of second capacitors to be charged is changed from plural to single, the first charging mode is switched to the second charging mode, but the voltage conversion unit is performed by performing the second charging mode in which the power conversion unit generates a constant current. Switching loss does not occur. If the remaining capacity of the single second capacitor to be charged is less than the threshold value, it takes a considerable amount of time to complete the charging of the second capacitor, so that the switching loss described above does not occur. it can. Thus, when it takes a considerable amount of time to charge the second battery to be charged, the benefit of not causing the switching loss in the voltage conversion unit is higher than the power loss by not changing the control of the power conversion unit, Excellent energy efficiency.

  According to the seventh aspect of the present invention, if the remaining capacity of the single second capacitor to be charged is equal to or greater than the threshold value, charging in the second charging mode is performed by generating a constant current by controlling the voltage conversion unit. Is called. When the number of second capacitors to be charged is changed from plural to single, the first charging mode is switched to the second charging mode. However, in the first charging mode, the power conversion unit is controlled to output a constant voltage. When the control of the power conversion unit is switched to generate a constant current in accordance with the switching to the two charging mode, a power loss due to the switching occurs. On the other hand, if the control of the power conversion unit does not change with the change of the charging mode, the power loss does not occur. For this reason, when a constant current is generated by controlling the voltage conversion unit, a switching loss occurs in the voltage conversion unit. However, if the remaining capacity of a single second capacitor to be charged is equal to or greater than a threshold value, the charging of the second capacitor is performed. Is completed in a short time, and thus enjoys the effect of suppressing power loss by not changing the control of the power conversion unit described above. Thus, if the charging of the second capacitor to be charged is completed in a short time, the energy loss is higher than the switching loss in the voltage conversion unit because the benefit of the power loss due to not changing the power conversion unit is high. Is excellent.

  According to the invention of claim 8, when a single second battery is charged in the second charging mode, the conversion unit for generating a constant current differs depending on the voltage of the second battery. For this reason, it is possible to perform charging in the second charging mode by performing control suitable for the voltage of the second battery in terms of energy efficiency on the power conversion unit or the voltage conversion unit.

  According to the ninth aspect of the present invention, if the voltage of the single second battery to be charged is less than the threshold value, charging in the second charging mode is performed by generating a constant current by controlling the power conversion unit. . When the number of second capacitors to be charged is changed from plural to single, the first charging mode is switched to the second charging mode, but the voltage conversion unit is performed by performing the second charging mode in which the power conversion unit generates a constant current. Switching loss does not occur. If the voltage of the single second capacitor to be charged is less than the threshold value, it takes a considerable time until the charging of the second capacitor is completed, so that the above-described effect that the switching loss does not occur can be enjoyed for a considerable time. . Thus, when it takes a considerable amount of time to charge the second battery to be charged, the benefit of not causing the switching loss in the voltage conversion unit is higher than the power loss by not changing the control of the power conversion unit, Excellent energy efficiency.

  According to the invention of claim 10, if the voltage of the single second battery to be charged is equal to or higher than the threshold value, charging in the second charging mode is performed by generating a constant current by controlling the voltage conversion unit. . When the number of second capacitors to be charged is changed from plural to single, the first charging mode is switched to the second charging mode. However, in the first charging mode, the power conversion unit is controlled to output a constant voltage. When the control of the power conversion unit is switched to generate a constant current in accordance with the switching to the two charging mode, a power loss due to the switching occurs. On the other hand, if the control of the power conversion unit does not change with the change of the charging mode, the power loss does not occur. For this reason, when a constant current is generated by controlling the voltage conversion unit, a switching loss occurs in the voltage conversion unit. However, if the voltage of a single second capacitor to be charged is equal to or higher than a threshold value, charging of the second capacitor is not performed. Since the process is completed in a short time, the effect of suppressing the power loss by not changing the control of the power conversion unit described above is enjoyed. Thus, if the charging of the second capacitor to be charged is completed in a short time, the energy loss is higher than the switching loss in the voltage conversion unit because the benefit of the power loss due to not changing the power conversion unit is high. Is excellent.

1 is a block diagram showing a schematic configuration of an electric vehicle equipped with a power storage control device according to an embodiment of the present invention. It is a figure which shows each flow of the electric current at the time of charging two sub batteries using a charger, and each operation | movement of the charger controlled by ECU, and VCU. It is a figure which shows each flow of the electric current at the time of charging a single sub battery with SOC less than a threshold value using a charger, and each operation | movement of the charger controlled by ECU, and VCU. It is a figure which shows each flow of the electric current at the time of charging a single sub battery with SOC more than a threshold value using a charger, and each operation | movement of the charger controlled by ECU, and VCU. The current flow when charging the main battery and the sub-battery using the charger when the SOC and voltage of the main battery are low, and the charger and VCU when the charger is controlled to operate in the CC mode It is a figure which shows each operation | movement. The current flow when charging the main battery and the sub-battery using the charger when the SOC and voltage of the main battery are high, and the charger and VCU when the charger is controlled to operate in the CV mode It is a figure which shows each operation | movement. It is a flowchart which shows the flow of the whole process of the charge control which ECU performs.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of an electric vehicle equipped with a power storage control device according to an embodiment of the present invention. As shown in FIG. 1, the electric vehicle includes a motor generator (MG) 11, a PDU (Power Drive Unit) 13, and a power storage control device 100 according to one embodiment. Hereinafter, each component provided in the electric vehicle will be described.

  Motor generator 11 generates driving force for the electric vehicle to travel using the electric power supplied from power storage control device 100. Motor generator 11 operates as a generator during regenerative braking, and the electric power generated by motor generator 11 is stored in power storage control device 100. The PDU 13 converts a DC voltage into an AC voltage and supplies a three-phase current to the motor generator 11. Further, the PDU 13 converts an AC voltage input during the regenerative operation of the motor generator 11 into a DC voltage.

  The power storage control device 100 controls power storage of electric power obtained from an external power source such as a commercial power source. As shown in FIG. 1, the power storage control device 100 includes a main battery BATm, two sub-batteries BATs1 and BATs2, a charger CHG, two VCUs (Voltage Control Units) 101 and 103, a switch 105, and an ECU 107. With.

  The main battery BATm is a secondary battery that mainly supplies power to the motor generator 11 and outputs a high DC voltage such as 100 to 200 V, for example. The main battery BATm is connected in parallel with the charger CHG via the switch 105, and can be charged with electric power from an external power source via the charger CHG.

  The sub-batteries BATs1 and BATs2 are secondary batteries that output a DC voltage lower than that of the main battery BATm, and can be detached from the electric vehicle by the user. The sub-batteries BATs1 and BATs2 are connected in parallel with the charger CHG via the VCUs 101 and 103, respectively, and can be charged with electric power from an external power source via the charger CHG.

  The charger CHG is connected in parallel with the main battery BATm and the sub batteries BATs1, BATs2 via the junction box JB. The charger CHG converts AC power from an external power source such as a commercial power source into DC power. The voltage level or current level of the DC power output from the charger CHG is controlled by the ECU 107. Note that charging from an external power source such as a commercial power source is not limited to normal charging with AC power, and may be rapid charging or non-contact charging.

  The VCU 101 is connected between the sub-battery BATs1 and the charger CHG, and switches the two switching elements Q1 and Q2 on and off to step down the DC power output from the charger CHG while maintaining the DC. The voltage level or current level of the DC power output from the VCU 101 is controlled by the ECU 107. Further, the ECU 107 performs through mode control in which the switching element Q1 whose emitter is connected to the reactor L is turned on and the switching element Q2 is turned off without switching the two switching elements Q1 and Q2 on and off. The DC power output from the charger CHG can be input to the sub-battery BATs1 without the VCU 101 stepping down. Also, the ECU 107 cuts off the current path between the charger CHG and the sub-battery BATs1 by performing stop control with the switching element Q1 turned off without switching the two switching elements Q1 and Q2 on and off. Can do. When the output voltage of sub battery BATs1 is an input voltage, VCU 101 boosts and outputs the output voltage of sub battery BATs1 when the two switching elements Q1 and Q2 are switched on and off.

  The VCU 103 is connected between the sub-battery BATs2 and the charger CHG, and switches the two switching elements Q3 and Q4 on and off to step down the DC power output from the charger CHG while maintaining the DC. The voltage level or current level of the DC power output from the VCU 103 is controlled by the ECU 107. Further, the ECU 107 performs through mode control in which the switching element Q3 whose emitter is connected to the reactor L is turned on and the switching element Q4 is turned off without switching the two switching elements Q3 and Q4 on and off. The DC power output from the charger CHG can be input to the sub-battery BATs2 without the VCU 103 stepping down. In addition, the ECU 107 cuts off the current path between the charger CHG and the sub-battery BATs2 by performing stop control with the switching element Q3 turned off without switching the two switching elements Q3 and Q4 on and off. Can do. When the output voltage of the sub battery BATs2 is used as the input voltage, the VCU 103 boosts and outputs the output voltage of the sub battery BATs2 if the two switching elements Q3 and Q4 are switched on and off.

  The switch 105 is a switch provided in the junction box JB for opening and closing a current path from the main battery BATm to the charger CHG or the sub batteries BATs1 and BATs2. The switch 105 is opened and closed under the control of the ECU 107.

  The ECU 107 performs control of the charger CHG, control of the VCUs 101 and 103, and opening / closing control of the switch 105. Further, the ECU 107 derives each remaining capacity (SOC: State of Charge) of the main battery BATm and the sub-batteries BATs1 and BATs2 by a current integration method and / or an OCV (open circuit voltage) estimation method. The ECU 107 turns off the switch 105 when the SOC of the main battery BATm exceeds a predetermined value during charging of the main battery BATm using the charger CHG. Details of the ECU 107 will be described later.

  Next, charging control of the sub batteries BATs1 and BATs2 performed by the power storage control device 100 of the present embodiment will be described with reference to FIGS. In the example shown in FIGS. 2 to 4, the main battery BATm is not charged.

  FIG. 2 is a diagram illustrating a current flow when charging the sub-batteries BATs1 and BATs2 using the charger CHG, and operations of the chargers CHG and VCUs 101 and 103 controlled by the ECU 107. As shown in FIG. 2, when charging the two sub-batteries BATs1 and BATs2 without charging the main battery BATm with the power from the external power source via the charger CHG, the ECU 107 The control is performed in the CV mode that outputs DC power of a constant voltage. For the VCUs 101 and 103, the output voltage of the charger CHG is stepped down and the charging current to the sub batteries BATs1 and BATs2 is constant. Control.

  When charging a plurality of sub-batteries BATs1 and BATs2, there is a high possibility that the respective SOCs are different. In such a case, the charger CHG is controlled in the CV mode, so that the stability of the charge control is improved. Can be improved.

  FIG. 3 is a diagram showing a current flow when charging only the sub-battery BATs1 whose SOC is less than the threshold value using the charger CHG, and each operation of the chargers CHG and VCUs 101 and 103 controlled by the ECU 107. As shown in FIG. 3, the main battery BATm is not charged from the state in which the main battery BATm is charged without charging the main battery BATm by the power from the external power source via the charger CHG. When shifting to a state in which only one sub-battery BATs1 is charged, the ECU 107 outputs constant-current DC power to the charger CHG if the SOC of the sub-battery BATs1 to be charged is less than the threshold ths. The VCU 101 corresponding to the sub-battery BATs1 to be charged is subjected to through mode control in which the switching element Q1 is turned on and the switching element Q2 is turned off. For the VCU 103 corresponding to BATs2, the switching element Q3 Performing a stop control in the OFF state. In this case, the charger CHG outputs a constant current, and the VCU 101 corresponding to the sub battery BATs1 to be charged flows the constant current directly to the sub battery BATs1, so the charging current to the sub battery BATs1 is constant. In addition, since the switching operation of the switching element is not performed in the VCU 101 that is controlled in the through mode, occurrence of switching loss can be prevented. In the example shown in FIG. 3, the sub battery BATs 1 is the charging target, but the same applies to the case where only the sub battery BATs 2 is the charging target.

  FIG. 4 is a diagram showing a current flow when charging only the sub battery BATs 1 whose SOC is equal to or greater than a threshold value using the charger CHG, and each operation of the chargers CHG and VCUs 101 and 103 controlled by the ECU 107. As shown in FIG. 4, the main battery BATm is not charged by the power from the external power source through the charger CHG, and the main battery BATm is not charged. When shifting to a state in which only one sub-battery BATs1 is charged, the ECU 107 outputs a constant voltage DC power to the charger CHG if the SOC of the sub-battery BATs1 to be charged is equal to or greater than the threshold ths. The control is performed in the mode, and for the VCU 101 corresponding to the sub battery BATs1 to be charged, the output voltage of the charger CHG is stepped down and the control in the CC mode in which the charging current to the sub battery BATs1 is constant is performed. Switching for the VCU 103 corresponding to the sub-battery BATs2 not to be charged Performing a stop control in the OFF state child Q3. In the example shown in FIG. 4, the sub battery BATs 1 is the charging target, but the same applies to the case where only the sub battery BATs 2 is the charging target.

  Next, charging control of the main battery BATm and the sub batteries BATs1, BATs2 performed by the power storage control device 100 of the present embodiment will be described with reference to FIGS. In the example shown in FIGS. 5 and 6, all of the main battery BATm and the two sub-batteries BATs1 and BATs2 are charged by external power via the charger CHG.

  FIG. 5 shows the current flow when charging the main battery BATm and the sub-batteries BATs1, BATs2 using the charger CHG when the SOC and voltage of the main battery BATm are low, and the charger CHG operates in the CC mode. It is a figure which shows each operation | movement of charger CHG and VCU101,103 in the case of being controlled in this way. As shown in FIG. 5, when all of the main battery BATm and the two sub-batteries BATs1 and BATs2 are charged with power from the external power source via the charger CHG, at a stage where the SOC and voltage of the main battery BATm are low, The ECU 107 performs control in a CC mode that outputs constant-current DC power to the charger CHG, and steps down the output voltage of the charger CHG to the sub-batteries BATs1 and BATs2 for the VCUs 101 and 103. The control is performed in the CC mode in which the charging current is constant.

  FIG. 6 shows a current flow when charging the main battery BATm and the sub batteries BATs1, BATs2 using the charger CHG when the SOC and voltage of the main battery BATm are high, and the charger CHG operates in the CV mode. It is a figure which shows each operation | movement of charger CHG and VCU101,103 in the case of being controlled in this way. As shown in FIG. 6, when all of the main battery BATm and the two sub-batteries BATs1 and BATs2 are charged with electric power from the external power source via the charger CHG, at a stage where the SOC and voltage of the main battery BATm are high, The ECU 107 performs control in a CV mode in which a constant voltage DC power is output to the charger CHG. For the VCUs 101 and 103, the output voltage of the charger CHG is stepped down to the sub batteries BATs1 and BATs2. The control is performed in the CC mode in which the charging current is constant.

  Next, the overall process of charge control by the ECU 107 will be described with reference to FIG. FIG. 7 is a flowchart showing an overall processing flow of charge control performed by the ECU 107.

  As shown in FIG. 7, ECU 107 derives the SOCs of main battery BATm and sub-batteries BATs1, BATs2 (step S101). Next, the ECU 107 determines a battery as a power reception target based on the SOC derived in step S101 (step S103). Next, the ECU 107 determines whether or not the main battery BATm is included in the battery to be charged determined in step S103 (step S105). If the main battery BATm is to be charged, the ECU 107 proceeds to step S107. If not, the process proceeds to step S113.

  In step S107, the ECU 107 determines whether or not the SOC of the main battery BATm is less than the threshold thm. If the SOC <thm, the ECU 107 proceeds to step S109, and if the SOC ≧ thm, the ECU 107 proceeds to step S111. In step S109, the ECU 107 controls the main battery BATm and the sub batteries BATs1, BATs2 to be charged in the charging mode shown in FIG. 5 using the charger CHG. On the other hand, in step S111, the ECU 107 controls the main battery BATm and the sub batteries BATs1 and BATs2 to be charged using the charger CHG in the charging mode shown in FIG.

  In step S107, the voltage value of main battery BATm may be used instead of the SOC of main battery BATm in the conditional branching of steps S109 and S111. In this case, if the voltage value of the main battery BATm is less than the threshold value, the process proceeds to step S109. On the other hand, if the voltage value of the main battery BATm is greater than or equal to the threshold value, the process proceeds to step S111.

  In step S113, the ECU 107 determines whether or not the number of sub-batteries included in the battery to be charged determined in step S103 is plural (two). If there are plural, the process proceeds to step S115. The process proceeds to S117. In step S115, ECU 107 uses charger CHG to control sub batteries BATs1, BATs2 to be charged in the charging mode shown in FIG.

  In step S117, the ECU 107 determines whether or not the SOC of the single sub-battery to be charged is less than the threshold ths. If the SOC <ths, the ECU 107 proceeds to step S119, and if the SOC ≧ ths, the ECU 107 proceeds to step S121. . In step S119, the ECU 107 controls the single sub-battery to be charged in the charging mode shown in FIG. 3 using the charger CHG. On the other hand, in step S121, the ECU 107 controls the single sub-battery to be charged in the charging mode shown in FIG. 4 using the charger CHG.

  In step S117, the voltage value of the sub-battery may be used in place of the SOC of the single sub-battery to be charged in the conditional branches of steps S119 and S121. In this case, if the voltage value of the sub battery to be charged is less than the threshold value, the process proceeds to step S119. On the other hand, if the voltage value of the sub battery to be charged is equal to or greater than the threshold value, the process proceeds to step S121.

  As described above, according to the present embodiment, as shown in step S113 to step S121 of FIG. 2 to FIG. 4 or FIG. 7, it differs depending on whether the number of sub-batteries to be charged is one or more. The sub battery to be charged is charged in the charging mode. Therefore, in terms of energy efficiency, when the number of sub-batteries to be charged is singular, the charging mode of FIG. 3 or FIG. 4 suitable for this case, and the charging of FIG. The sub-battery can be charged in a manner. That is, efficient charging according to the number of sub-batteries to be charged is possible.

  Also, as shown in FIG. 2, if the battery to be charged is two sub-batteries BATs1, BATs2, the charger is controlled in the CV mode, so when charging these two sub-batteries BATs1, BATs2 Can be controlled stably. In addition, since the constant voltage obtained by controlling the charger in the CV mode is applied to each of the two sub-batteries BATs1 and BATs2 to be charged, the VCU corresponding to each sub-battery generates a constant voltage. Less energy loss than As described above, when charging the two sub-batteries BATs1 and BATs2, it is more efficient to generate a constant voltage by controlling the charger CHG in the CV mode.

  As shown in FIGS. 3 and 4, when the battery to be charged is only one sub battery, the charging of the sub battery to be charged is performed with a constant current. Efficiency can be improved. Further, when the battery to be charged is only one sub battery, the target controlled in the CC mode differs depending on the SOC or voltage of the sub battery. That is, if the SOC of the sub battery to be charged is less than the threshold ths as shown in FIG. 3, the charger CHG is controlled in the CC mode, and the SOC of the sub battery to be charged is equal to or higher than the threshold ths as shown in FIG. If so, the VCU is controlled in the CC mode. If the voltage of the sub battery to be charged is less than the threshold value, the charger CHG is controlled in the CC mode. If the voltage of the sub battery to be charged is equal to or higher than the threshold value, the VCU is controlled in the CC mode.

  For this reason, since the number of sub-batteries to be charged is two, when the charger is controlled in the CV mode, the control mode of the charger CHG is switched when the charging target is changed to any one sub-battery. A power loss occurs in the charger CHG. However, if the SOC or voltage of the sub-battery to be charged is low, it takes a considerable amount of time to complete the charging of the sub-battery. Therefore, the charging mode shown in FIG. 2 is switched to the charging mode shown in FIG. However, the effect that no switching loss occurs in the VCU can be enjoyed for a considerable time. In this way, when a considerable amount of time is required for charging the sub-battery to be charged, since the benefit of not causing the switching loss in the VCU is higher than the power loss due to not changing the control of the charger CHG, the energy efficiency is higher. Excellent.

  On the other hand, if the control of the charger CHG does not change as the charging mode changes, the above-described power loss does not occur. For this reason, when control in the CC mode is performed on the VCU, switching loss in the VCU occurs. However, if the SOC or voltage of the sub battery to be charged is high, charging of the sub battery is completed in a short time. The effect of suppressing the power loss by not changing the control of the charger CHG described is enjoyed. Thus, if the charging of the sub-battery to be charged is completed in a short time, the energy loss is higher than the switching loss in the VCU because the benefit of the power loss due to not changing the control of the charger CHG is high, so that the energy efficiency is excellent.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. For example, in the above embodiment, two sub-batteries are provided, but three or more may be provided.

  Further, the present invention may be applied not only to a transportation device such as an electric vehicle driven by only electric power supplied from a battery but also to a transportation device such as a plug-in hybrid vehicle equipped with an internal combustion engine.

100 Power storage control device 101, 103 VCU
105 switch 107 ECU
BATm Main battery BATs1, BATs2 Sub battery CHG Charger

Claims (12)

A first capacitor;
A plurality of second capacitors having a lower voltage than the first capacitor;
A power conversion unit for converting power supplied from an external power source;
A voltage conversion unit that converts the voltage of the power converted by the power conversion unit provided in the same number as the number of the second capacitors corresponding to each of the plurality of second capacitors;
A control unit that determines a storage target storage device from among the first storage unit and the plurality of second storage units, and controls the power conversion unit and the voltage conversion unit to charge the storage target storage unit; ,
The control unit is charged in different charging modes depending on whether the number of the second capacitors to be charged is one or more of two charging modes in which the operations of the power conversion unit and the voltage conversion unit are different. A power storage control device that controls the power conversion unit and the voltage conversion unit to charge the second power storage device. The power storage control device according to claim 1,
The two charging modes include a first charging mode for applying a constant voltage to a capacitor to be charged, and a second charging mode for supplying a constant current to the capacitor to be charged.
The said control part is an electrical storage control apparatus which controls to charge the said 2nd electrical storage device by the 1st charge mode, when the electrical storage device to be charged is a plurality of said 2nd electrical storage devices. The power storage control device according to claim 2,
The said constant voltage obtained by a said 1st charge aspect is an electrical storage control apparatus produced | generated when the said control part controls the said power conversion part. The power storage control device according to any one of claims 1 to 3,
The two charging modes include a first charging mode for applying a constant voltage to a capacitor to be charged, and a second charging mode for supplying a constant current to the capacitor to be charged.
The said control part is an electrical storage control apparatus which controls to charge the said 2nd electrical storage device by the said 2nd charge aspect, when the electrical storage device to be charged is a single said 2nd electrical storage device. The power storage control device according to claim 4,
The constant current obtained in the second charging mode is generated by the control unit controlling the power conversion unit or the control unit controlling the voltage conversion unit,
The said control part is an electrical storage control apparatus which produces | generates the said constant current by controlling the said power conversion part or the said voltage conversion part according to the remaining capacity of the said 1st 2nd battery of charge object. The power storage control device according to claim 5,
The said control part is an electrical storage control apparatus which controls the said power conversion part and produces | generates the said constant current, if the remaining capacity of the said 1st 2nd electrical storage device of charge object is less than a threshold value. The power storage control device according to claim 5 or 6,
The said control part is an electrical storage control apparatus which controls the said voltage conversion part and produces | generates the said constant current, if the remaining capacity of the said 1st 2nd electrical storage device of charge object is more than a threshold value. The power storage control device according to claim 4,
The constant current obtained in the second charging mode is generated by the control unit controlling the power conversion unit or the control unit controlling the voltage conversion unit,
The said control part is an electrical storage control apparatus which produces | generates the said constant current by controlling the said power conversion part or the said voltage conversion part according to the voltage of the said 1st 2nd electrical storage device of charge object. The power storage control device according to claim 8, wherein
The said control part is an electrical storage control apparatus which controls the said power conversion part and produces | generates the said constant current, if the voltage of the said 1st 2nd electrical storage device of charge object is less than a threshold value. The power storage control device according to claim 8 or 9,
The said control part is an electrical storage control apparatus which controls the said voltage conversion part and produces | generates the said constant current, if the voltage of the said 1st 2nd electrical storage device of charge object is more than a threshold value.   A transportation device comprising the power storage control device according to claim 1. A first capacitor;
A plurality of second capacitors having a lower voltage than the first capacitor;
A power conversion unit for converting power supplied from an external power source;
A voltage conversion unit that converts the voltage of the power converted by the power conversion unit provided in the same number as the number of the second capacitors corresponding to each of the plurality of second capacitors;
A control unit that determines a storage capacitor to be charged among the first storage capacitor and the plurality of second storage devices, and controls the power conversion unit and the voltage conversion unit to charge the storage capacitor to be charged; A power storage control method performed by the power storage control device,
The control unit is charged in different charging modes depending on whether the number of the second capacitors to be charged is one or more of two charging modes in which the operations of the power conversion unit and the voltage conversion unit are different. The power storage control method of controlling the power conversion unit and the voltage conversion unit so as to charge the second battery.

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