JP2013243790A - Apparatus for controlling power source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for controlling a power source that can easily adjust voltage deviation for each battery by an external device.SOLUTION: There is provided an apparatus 11 for controlling a power source 12 in which a plurality of batteries 13 are connected in parallel, and which is capable of charge/discharge by an external device 25 relative to the batteries 13. The apparatus 11 selects whether voltage adjustment among the batteries 13 is performed by charge or is performed by discharge in response to a charging request or a discharge request from the external device 25 when the voltage is different among the plurality of batteries 13.

Description

  The present invention relates to a power supply control device including a plurality of batteries.

  For example, in an electric vehicle or the like, a power supply system including a plurality of batteries is used in order to increase capacity and output. In such a power supply system, it is known that charging is performed from a battery having a low voltage or discharging is performed from a battery having a high voltage (see, for example, Patent Documents 1 to 3).

JP 2011-3453 A JP 2008-178220 A JP 2007-336782 A

  By the way, if the voltage divergence for each battery is large, the circulating current value is too large to exchange current between the batteries. In such a case, it is necessary to actively request the external device to input and output current.For example, in a situation where the input and output of current due to running and regeneration fluctuate while driving the vehicle, voltage adjustment should be performed. Is difficult.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power supply control device capable of easily adjusting a voltage deviation for each battery by an external device.

In order to achieve the above object, a power supply control device of the present invention is a power supply control device in which a plurality of batteries are connected in parallel, and charging and discharging by an external device with respect to the batteries is possible.
When the voltages are different among the plurality of batteries, it is selected whether the voltage adjustment between the batteries is executed by charging or discharging according to a charge request or discharge request from the external device.

  According to this configuration, the voltage adjustment means by charging or discharging from the battery according to the request from the external device side without actively requesting input / output of power to the external device according to the situation on the power source side. By selecting, the voltage of the battery can be equalized. Thereby, the influence on the external device by the voltage adjustment of a battery can be suppressed.

  According to the power supply control device of the present invention, the voltage deviation for each battery can be easily adjusted by an external device.

It is a schematic block diagram of the control apparatus of the power supply which concerns on embodiment. It is a figure which shows the procedure of the equalization control of the voltage of the battery by the control apparatus of the power supply which concerns on embodiment, Comprising: (a)-(c) is a schematic block diagram of a power supply, respectively. It is a figure which shows the procedure of the equalization control of the voltage of the battery by the control apparatus of the power supply which concerns on embodiment, Comprising: (a) is a schematic block diagram which shows the equalization control at the time of a charge request | requirement, (b) is at the time of a discharge request | requirement It is a schematic block diagram which shows equalization control. It is a schematic block diagram of the control apparatus of the power supply which concerns on the specific example 1. It is a figure which shows the procedure of the equalization control of the voltage of the battery by the control apparatus of the power supply which concerns on the specific example 1, Comprising: (a) is a schematic block diagram which shows the equalization control at the time of a discharge request | requirement, (b) is the time of a charge request | requirement It is a schematic block diagram which shows equalization control in. It is a schematic block diagram of the control apparatus of the power supply which concerns on the specific example 2. It is a figure which shows the procedure of the equalization control of the voltage of the battery by the control apparatus of the power supply which concerns on the specific example 2, Comprising: (a) is a schematic block diagram which shows the equalization control at the time of a discharge request, (b) is at the time of a charge request | requirement It is a schematic block diagram which shows equalization control in.

  Embodiments of a power supply control device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a power supply control device according to the embodiment.
As shown in FIG. 1, a power supply control device 11 according to this embodiment is incorporated in a power supply 12.

  The power source 12 includes a plurality of batteries 13 that are chargeable / dischargeable secondary batteries, and these batteries 13 are connected in parallel to the power supply lines 14a and 14b. The power source 12 is mounted on, for example, an electric vehicle, a hybrid vehicle, or a fuel cell vehicle, and is used as a power source for driving these vehicles.

  The batteries 13 constituting the power supply 12 are detachable and can be individually replaced. The battery 13 is monitored by the control device 11, and when a part of the battery 13 is determined to be abnormal, the battery 13 is disconnected from the circuit of the power supply 12.

  The power supply lines 14 a and 14 b are provided with a voltage sensor 21, and the voltage sensor 21 measures a voltage between the power supply lines 14 a and 14 b of the power supply 12. Further, a current sensor 22 is connected to the power supply line 14 a, and the current sensor 22 measures a current flowing through the power supply line 14 a of the power supply 12.

  A battery connection device 24 is provided between each battery 13 and the power supply line 14a. As these battery connection devices 24, for example, a relay or the like is used.

  The power supply lines 14 a and 14 b of the power supply 12 are connected to the external device 25. The power source 12 is supplied with power from the external device 25 or supplies power to the external device 25. That is, the power supply 12 is charged / discharged with respect to the external device 25.

  The voltage sensor 21 and the current sensor 22 are connected to the control device 11, and the voltage value and the current value of the power source 12 measured by the voltage sensor 21 and the current sensor 22 are transmitted to the control device 11.

  Further, the control device 11 is connected to the external device 25, and a charge / discharge request signal indicating whether charging or discharging is requested to the power source 12 from the external device 25 to the control device 11 is received. Sent.

  Moreover, the control apparatus 11 is connected to the battery connection device 24, and these battery connection devices 24 are driven by a control signal from the control apparatus 11, and open and close a circuit between the battery 13 and the power supply line 14a. .

By the way, in the power supply 12 provided with the some battery 13, when only one battery 13 is replaced | exchanged, a voltage difference may arise between the other batteries 13. FIG.
Therefore, a method of voltage equalization control for each battery 13 in the control device 11 according to the present embodiment when a voltage difference occurs between the batteries 13 as described above will be described.

  FIG. 2 is a diagram showing a procedure for equalization control of battery voltage by the power supply control device according to the embodiment, wherein (a) to (c) are schematic configuration diagrams of the power supply, and FIG. It is a figure which shows the procedure of the equalization control of the voltage of the battery by the control apparatus of such a power supply, Comprising: (a) is a schematic block diagram which shows the equalization control at the time of a charge request | requirement, (b) is equalization control at the time of a discharge request | requirement It is a schematic block diagram which shows.

(1) First, as shown in FIG. 2A, the battery connection device 24 is individually connected, and the voltage value for each battery 13 is measured by the voltage sensor 21.

(2) Based on the voltage measurement result, as shown in FIG. 2 (b), the battery with high voltage (the battery on the left side in FIG. 2 (b)) 13 is set to have a discharge request, and the battery with low voltage ( The battery at the center and the right side in FIG. Specifically, when charging or discharging is performed in order to equalize the voltages of the batteries 13, it is set for each battery 13 whether charging or discharging is necessary and how much the voltage needs to be changed.

  At this time, by connecting the battery connection devices 24 of a plurality of batteries 13 having a high voltage, these batteries 13 are set to the same potential, and a group of these batteries 13 is set to have a discharge request, or a plurality of batteries having a low voltage are set. By connecting the battery connection device 24 of the battery 13, these batteries 13 may be set to the same potential, and the group of these batteries 13 may be set to be charged.

(3) Based on the charge / discharge request signal from the external device 25, it is determined whether charging or discharging is requested from the external device 25, as shown in FIG. The control device 11 includes an interface that determines whether the external device 25 requests charging or discharging.

(4) Next, based on the determination result of the charge request or discharge request from the external device 25, the voltage of the battery 13 is adjusted by charging or discharging.

(When charging is requested)
When a charge request is made from the external device 25, as shown in FIG. 3A, the battery 13 or the battery connection device 24 of the group of the batteries 13 set to be charged is connected and charged from the external device 25. Power is supplied to the battery 13 or the group of batteries 13 set as required. Thereby, the battery 13 with a low voltage is charged, and voltage equalization with the battery 13 with a high voltage is achieved.

(In case of discharge request)
When a discharge request is made from the external device 25, as shown in FIG. 3B, the battery 13 or the battery connection device 24 of the group of the batteries 13 set to have a discharge request is connected and set to have a discharge request. Power is supplied from the battery 13 or the group of batteries 13 to the external device 25. Thereby, the battery 13 with a high voltage discharges, and equalization of the voltage with the battery 13 with a low voltage is achieved.

  Whether or not the voltages of the respective batteries 13 are equal is determined by switching the connection by the battery connecting device 24 and individually measuring the voltages of the batteries 13 by the voltage sensor 21 and matching the voltage values of the batteries 13. can do. And it is judged that the voltage of each battery 13 became equal, and the equalization control of the voltage of the battery 13 is complete | finished.

  As described above, according to the power supply control device according to the above-described embodiment, the external device 25 is not actively requested to input / output power according to the situation on the power supply 12 side, and the external device 25 side is requested. By selecting the voltage adjusting means by charging the battery 13 or discharging from the battery 13, the voltage of the battery 13 can be equalized. Thereby, the influence on the external device 25 by the voltage adjustment of the battery 13 can be suppressed.

  In the embodiment described above, the voltage of each battery 13 is measured by one voltage sensor 21 by individually connecting the battery connection devices 24. However, the voltage sensor 21 is provided in each battery 13, These voltage sensors 21 may measure the voltage of the battery 13.

Next, a further specific example of the power supply control device of the above embodiment will be described.
(Specific example 1)
As shown in FIG. 4, in the specific example 1, the power source 12 is provided in the motor 31, and the motor 31 is driven by the power supplied from the power source 12. The motor 31 has a regenerative function, and the regenerative power generated by the motor 31 can be supplied to the power supply 12.

  The motor 31 includes an inverter 32 that converts the power of the power source 12 from DC to AC and supplies it to the motor 31, and also converts the power of the motor 13 from AC to DC and supplies it to the power source 12. Power lines 14 a and 14 b of the power source 12 are connected to the inverter 32.

  In the first specific example, when the motor 31 is driven, a charge / discharge request signal for a discharge request is transmitted to the control device 11. Accordingly, as shown in FIG. 5A, the control device 11 connects the battery 13 or the battery connection device 24 of the group of the batteries 13 set to have a discharge request, and the battery 13 or the battery set to have a discharge request. Electric power is supplied from the group 13 to the inverter 32 of the motor 31 that is the external device 25. Thereby, the battery 13 with a high voltage discharges, and equalization of the voltage with the battery 13 with a low voltage is achieved.

  On the contrary, when the motor 31 is regenerated, a charge / discharge request signal for a charge request is transmitted to the control device 11. Thereby, as shown in FIG. 5 (b), the control device 11 connects the battery 13 or the battery connection device 24 of the group of the batteries 13 set to have a charge request, and the battery 13 or the battery set to have a charge request. Power is supplied to the group 13 from the inverter 32 of the motor 31 that is the external device 25. Thereby, the battery 13 with a low voltage is charged, and voltage equalization with the battery 13 with a high voltage is achieved.

(Specific example 2)
As shown in FIG. 6, in the specific example 2, the charger / discharger 35 that charges and discharges according to the power supply / demand request from each system outside the own system, such as a smart grid, 14b.

  In the second specific example, a charge / discharge request signal for a discharge request is transmitted to the control device 11 when power is supplied to a system outside the own system. Thereby, as shown in FIG. 7A, the control device 11 connects the battery 13 or the battery connection device 24 of the group of the batteries 13 set to have a discharge request, and the battery 13 or the battery set to have a discharge request. Power is supplied from the group 13 to the charger / discharger 35 which is the external device 25. Thereby, the battery 13 with a high voltage discharges, and equalization of the voltage with the battery 13 with a low voltage is achieved.

  On the contrary, a charge request / discharge request signal for a charge request is transmitted to the control device 11 at the time of charging with power from a system outside the own system. Thereby, as shown in FIG. 7 (b), the control device 11 connects the battery 13 or the battery connection device 24 of the group of the batteries 13 set to be charged and the battery 13 or the battery set to be charged. Power is supplied to the group 13 from the charger / discharger 35 which is the external device 25. Thereby, the battery 13 with a low voltage is charged, and voltage equalization with the battery 13 with a high voltage is achieved.

11 Control device 12 Power supply 13 Battery 25 External device 31 Motor (external device)
35 Charger / discharger (external device)

Claims (1)

A control device for a power source in which a plurality of batteries are connected in parallel and can be charged and discharged by an external device with respect to the batteries,
Charging a battery for selecting whether to perform voltage adjustment between the batteries by charging or discharging according to a charge request or discharge request from the external device when the voltages are different among the plurality of batteries. Discharge control device.

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