JP7287908B2 - Control device - Google Patents

Description

The present invention relates to a control device, control system, control method, and control program for controlling a secondary battery.

Currently, secondary batteries such as lithium-ion batteries and nickel-metal hydride batteries are used in vehicles that use electric power as driving force, such as electric vehicles, hybrid vehicles, and plug-in hybrid vehicles. Such a vehicle includes a plurality of secondary battery groups in which a plurality of secondary batteries are connected in series, and a plurality of control devices that control these secondary battery groups.

JP-A-2000-184620

In such a vehicle, when the control device is reset due to a momentary voltage interruption of the auxiliary equipment during operation of the vehicle, the switch of the secondary battery group controlled by the control device is opened, and the secondary battery group is closed. Some of them are constructed so as to change from the state to the open state. At this time, a voltage difference may occur between the open secondary battery group controlled by the reset control device and the closed secondary battery group controlled by the non-reset control device. . If the switch of the secondary battery group in the open state is closed while such a voltage difference is occurring, the voltage difference may cause an arc, which may cause welding in the closed state of the switch. Therefore, there is a problem that the switch of the secondary battery group that has been opened cannot be closed again to supply the electric power of the secondary battery group to the electronic equipment of the vehicle while the vehicle is in operation.

Regarding this point, the power supply switching device disclosed in Patent Document 1 limits the power supplied from the standby power supply to the main circuit via the switching unit to within a predetermined range, thereby preventing the switching unit from being welded by the power. To prevent. However, this power supply switching device is for switching the power supply of the power supplied to the main circuit to the main power supply or the standby power supply, and does not control the voltage of the secondary battery group, so the above problem is solved. Can not do it.

The present invention is intended to solve such a problem. It is an object of the present invention to provide a control device, a control system, a control method, and a control program capable of supplying electric power of a secondary battery group to electronic equipment of a vehicle without fusing a switch of the battery group.

A control device for controlling a plurality of secondary battery groups connected in parallel according to an aspect of the present invention is provided when at least one secondary battery group among the plurality of secondary battery groups changes from a closed state to an open state. a voltage difference determination unit for determining a voltage difference between the open state secondary battery group and the closed state secondary battery group; and charging and discharging of the closed state secondary battery group according to the determination result of the voltage difference determination unit. and an open/close control unit for controlling opening and closing of the switch of the secondary battery group in the open state according to the determination result of the voltage difference determination unit. The voltage difference determination unit determines whether or not the voltage of the secondary battery group in the closed state is higher than the voltage of the secondary battery group in the open state by a threshold value or more. When the voltage of the closed secondary battery group is higher than the voltage of the open secondary battery group by a threshold value or more, the charge/discharge control unit at least one of suppresses charging and promotes discharging of the closed secondary battery group. I do. The switching control unit closes the switch of the open secondary battery group when the difference between the voltage of the secondary battery group in the closed state and the voltage of the secondary battery group in the open state is less than a threshold value. The threshold value is preferably equal to or greater than the minimum value at which arcing may occur when the switch of the secondary battery group in the open state is closed, and welding may occur when the switch is closed.

Further, according to another aspect of the present invention, there is provided a control device for controlling a plurality of secondary battery groups connected in parallel, wherein at least one secondary battery group of the plurality of secondary battery groups changes from a closed state to an open state. a voltage difference determination unit for determining a voltage difference between the open state secondary battery group and the closed state secondary battery group; and an open/close control unit for controlling opening/closing of the switch of the secondary battery group in the open state according to the determination result of the voltage difference determination unit. The voltage difference determination unit determines whether or not the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by a threshold value or more. When the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by a threshold value or more, the charge/discharge control unit at least one of suppressing discharging and promoting charging of the secondary battery group in the closed state. I do. The switching control unit closes the switch of the open secondary battery group when the difference between the voltage of the secondary battery group in the closed state and the voltage of the secondary battery group in the open state is less than a threshold value.

Furthermore, a control system according to another aspect of the present invention includes a plurality of secondary battery groups connected in parallel, and the control device described above.

Further, in a control method for controlling a plurality of secondary battery groups connected in parallel according to another aspect of the present invention, at least one secondary battery group of the plurality of secondary battery groups is switched from a closed state to an open state. determining whether the voltage of the secondary battery group in the closed state is higher than the voltage of the secondary battery group in the open state by a threshold or more; when the voltage of the secondary battery group in the closed state is higher than the voltage of the secondary battery group in the closed state by a threshold value or more; and closing the switch of the secondary battery group in the open state when the difference from the voltage of the secondary battery group in the open state is less than a threshold.

Further, in a control method for controlling a plurality of secondary battery groups connected in parallel according to another aspect of the present invention, at least one secondary battery group of the plurality of secondary battery groups is switched from a closed state to an open state. determining whether the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by a threshold or more; when the voltage of the secondary battery group is lower than the voltage of the secondary battery group by a threshold value or more, at least one of suppressing discharging and promoting charging of the secondary battery group in the closed state is executed; and closing the switch of the open secondary battery group when the difference between the voltage of the secondary battery group and the voltage of the secondary battery group is less than the threshold value.

Further, according to another aspect of the present invention, a program executed by an arithmetic device included in a control device for controlling a plurality of secondary battery groups connected in parallel is provided to the arithmetic device to control at least one of the plurality of secondary battery groups. a step of determining whether or not the voltage of the secondary battery group in the closed state is higher than the voltage of the secondary battery group in the open state by a threshold value or more when the secondary battery group changes from the closed state to the open state; when the voltage of the secondary battery group in the closed state is higher than the voltage of the secondary battery group in the open state by a threshold value or more, executing at least one of suppressing charging and promoting discharge of the secondary battery group in the closed state; and closing the switch of the open secondary battery group when the difference between the voltage of the secondary battery group in the closed state and the voltage of the secondary battery group in the open state is less than the threshold.

Further, according to another aspect of the present invention, a program executed by an arithmetic device included in a control device for controlling a plurality of secondary battery groups connected in parallel is provided to the arithmetic device to control at least one of the plurality of secondary battery groups. a step of determining whether the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by a threshold value or more when the secondary battery group changes from the closed state to the open state; when the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by a threshold value or more, executing at least one of suppressing discharging and promoting charging of the secondary battery group in the closed state; and closing the switch of the open secondary battery group when the difference between the voltage of the secondary battery group in the closed state and the voltage of the secondary battery group in the open state is less than the threshold.

In the aspect of the present invention described above, by adopting the above configuration, when at least one of the plurality of secondary battery groups changes from the closed state to the open state, the closed state secondary battery group is higher than the voltage of the secondary battery group in the open state, at least one of suppression of charging and acceleration of discharge of the secondary battery group in the closed state is performed. On the other hand, when the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state, at least one of suppression of discharging and acceleration of charging of the secondary battery group in the closed state is performed. Then, when the difference between the voltage of the secondary battery group in the closed state and the voltage of the secondary battery group in the open state reaches a value at which there is no possibility that the switches of the secondary battery group in the open state are welded, Close the switch. Therefore, the electric power of the secondary battery group can be supplied to the electronic device of the vehicle without fusing the switch of the secondary battery group in the open state.

According to the present invention, even when a part of a plurality of secondary battery groups connected in parallel changes from a closed state to an open state, the secondary battery group can be switched without fusing the switch of the secondary battery group that has changed to the open state. It is possible to provide a control device, a control system, a control method, and a control program capable of supplying electric power of a battery group to an electronic device of a vehicle.

1 illustrates a control system according to an embodiment of the invention; FIG. It is a figure which shows the structure of the control apparatus which concerns on one Embodiment of this invention. 4 is a flow chart showing an example of processing executed by a control device according to an embodiment of the present invention; 4 is a flow chart showing an example of voltage adjustment processing executed by a control device according to an embodiment of the present invention;

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a control system 1 according to one embodiment of the invention. A control system 1 is a system for controlling a plurality of secondary battery groups 30 and 40 installed in a vehicle. Control system 1 includes control device 10 , control device 20 , secondary battery group 30 , and secondary battery group 40 . The control device 10 and the control device 20 can perform data communication with each other. In addition, the control device 10 and the control device 20 can perform data communication with an in-vehicle electronic device 50, which is electronic equipment installed in the vehicle. The secondary battery group 30 and the secondary battery group 40 are connected in parallel.

Control devices 10 and 20 are devices that control secondary battery groups 30 and 40 to be controlled, respectively. A specific example of the control devices 10 and 20 is an ECU (Electronic Control Unit) installed in a vehicle. Control devices 10 and 20 control the open/close states of switches provided in secondary battery groups 30 and 40, respectively. Control devices 10 and 20 periodically transmit control signals for closing the switches to secondary battery groups 30 and 40, respectively.

Control devices 10 and 20 can also obtain voltage values indicating the voltages from voltage sensors (not shown) that detect the voltages of secondary battery groups 30 and 40, respectively.

The secondary battery groups 30 and 40 are power sources that supply electric power to the in-vehicle electronic device 50 . The secondary battery groups 30, 40 control opening/closing of the switches 31, 32, 41, 42 based on control signals transmitted by the control devices 10, 20, respectively. Specifically, the secondary battery groups 30 and 40 close the switch while receiving the control signal for closing the switch. On the other hand, when the secondary battery groups 30 and 40 do not receive the control signal, the switch is opened.

FIG. 2 is a block diagram showing the configuration of the control device 10. As shown in FIG. Since the control device 20 has the same configuration as the control device 10, description thereof is omitted.

The control device 10 includes a communication interface (I/F) 11 , a storage device 12 and an arithmetic device 13 . The communication I/F 11 is an interface for transmitting and receiving signals between the control device 10 , the control device 20 , the secondary battery group 30 and the in-vehicle electronic device 50 . The storage device 12 is a storage device in which control programs executed by the arithmetic device 13 and various information processed by the arithmetic device 13 are saved.

The arithmetic unit 13 is an arithmetic unit such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). The arithmetic device 13 executes the control method by loading the control program stored in the storage device 12 into the storage device within the arithmetic device 13 and executing the control program. The control program includes a reset detection unit 14, a setting unit 15, a start detection unit 16, a voltage difference determination unit 17, a charge/discharge control unit 18, and an open/close control unit 19, which are program modules. The functions of these program modules may be realized by an integrated circuit such as FPGA (Field-Programmable Gate Array) or ASIC (Application Specific Integrated Circuit).

The reset detection unit 14 is a program module that determines whether or not another control device 20 included in the control system 1 has been reset. The reset detection unit 14 can determine whether or not the control device 20 has been reset by determining whether or not communication with the control device 20 has been interrupted. When communication with the control device 20 is cut off, the reset detection unit 14 determines that the control device 20 has been reset.

Further, when the control device 20 is reset, the reset detection unit 14 determines whether or not the reset is continuously occurring. The reset detection unit 14 can determine whether or not resets have occurred consecutively by determining whether or not the number of times communication with the control device 20 has been interrupted during a predetermined period of time exceeds a predetermined value. When the number of times that communication with the control device 20 is interrupted in a predetermined time period exceeds a predetermined value, the reset detection unit 14 determines that resets have occurred consecutively.

Note that the reset detection unit 14 may determine whether or not the control device 20 has been reset based on a specific signal transmitted when the control device 20 is reset. In this case, the reset detection unit 14 can determine whether or not resets are continuously occurring by determining whether or not the number of times of the specific signal received from the control device 20 in a predetermined period of time exceeds a predetermined value.

The setting unit 15 is a program module for setting the control device 10 as a master device or a slave device. When the control device 10 is set as the master device, it is possible to control the opening and closing of the switches of the secondary battery group 40 via the control device 20, which is the slave device. On the other hand, when the control device 10 is set as a slave device, it controls opening and closing of the switches of the secondary battery group 30 according to instructions from the control device 20, which is the master device. Note that when the control device 10 is reset, the setting unit 15 sets the control device 10 as a slave device.

The activation detection unit 16 is a program module that determines whether or not the reset control device 20 has been activated. The activation detection unit 16 can determine whether or not the control device 20 has been activated by determining whether or not communication with the control device 20 has been established. When communication with the control device 20 is established, the activation detection unit 16 determines that the control device 20 has been activated.

The voltage difference determination unit 17 is a program module that determines the voltage difference between the secondary battery group 30 and the secondary battery group 40 . The voltage difference determination unit 17 can acquire a voltage value indicating the voltage from the voltage sensor that detects the voltage of the secondary battery group 30 . Also, the voltage difference determination unit 17 can acquire a voltage value indicating the voltage of the secondary battery group 40 from the control device 20 . The voltage difference determination unit 17 calculates a voltage difference based on the voltage value of the secondary battery group 30 and the voltage value of the secondary battery group 40, and compares the voltage difference with a predetermined threshold.

The charge/discharge control unit 18 is a program module that controls charging and discharging of the secondary battery groups 30 and 40 according to the determination result of the voltage difference determination unit 17 . Specifically, when suppressing charging of the secondary battery groups 30 and 40, the charge/discharge control unit 18 supplies electric power generated using regenerative energy to the secondary battery groups 30 and 40. 50, a control signal for suppressing charging of the secondary battery groups 30 and 40 is transmitted. Upon receiving the control signal, the in-vehicle electronic device 50 suppresses charging of the secondary battery groups 30 and 40 by suppressing power supply to the secondary battery groups 30 and 40 .

On the other hand, when promoting charging of the secondary battery groups 30 and 40 , the charge/discharge control unit 18 transmits a control signal to promote charging of the secondary battery groups 30 and 40 to the in-vehicle electronic device 50 . Upon receiving the control signal, the in-vehicle electronic device 50 promotes charging of the secondary battery groups 30 and 40 by promoting power supply to the secondary battery groups 30 and 40 .

Further, in a case where the vehicle includes an auxiliary battery that supplies electric power to the secondary battery groups 30 and 40, when the charging of the secondary battery groups 30 and 40 is suppressed, the charge/discharge control unit 18 controls the auxiliary battery A control signal for suppressing charging of the secondary battery groups 30 and 40 is transmitted to the in-vehicle electronic device 50 that controls the . Upon receiving the control signal, the in-vehicle electronic device 50 suppresses charging of the secondary battery groups 30 and 40 by suppressing power supply from the auxiliary battery to the secondary battery groups 30 and 40 .

On the other hand, when promoting charging of the secondary battery groups 30 and 40 , the charge/discharge control unit 18 transmits a control signal to promote charging of the secondary battery groups 30 and 40 to the in-vehicle electronic device 50 . Upon receiving the control signal, the in-vehicle electronic device 50 promotes charging of the secondary battery groups 30 and 40 by promoting power supply from the auxiliary battery to the secondary battery groups 30 and 40 .

When promoting the discharge of the secondary battery groups 30 and 40, the charge/discharge control unit 18 sends a control signal for promoting power consumption to the in-vehicle electronic device 50 that consumes the power of the secondary battery groups 30 and 40. Send. The in-vehicle electronic device 50 increases power consumption upon receiving the control signal. As a result, discharging of secondary battery groups 30 and 40 is promoted.

On the other hand, when suppressing the discharge of the secondary battery groups 30 and 40, the charge/discharge control unit 18 controls the in-vehicle electronic device 50 that consumes the power of the secondary battery groups 30 and 40 to suppress power consumption. Send a signal. The in-vehicle electronic device 50 reduces power consumption upon receiving the control signal. As a result, discharge of secondary battery groups 30 and 40 is suppressed.

The opening/closing control unit 19 is a program module that controls opening/closing of the switches of the secondary battery groups 30 and 40 . When the control device 10 is set as a master device, the switching control unit 19 periodically transmits a control signal for closing the switches 31 and 32 of the secondary battery group 30 to the secondary battery group 30 . Therefore, while the control device 10 is activated, the switches 31 and 32 of the secondary battery group 30 are closed, and the secondary battery group 30 is closed. On the other hand, when the control device 10 is reset, the control signal is not transmitted to the secondary battery group 30, so the switches 31 and 32 of the secondary battery group 30 are opened, and the secondary battery group 30 is in an open state.

The open/close control unit 19 also transmits a control signal for closing the switches 41 and 42 of the secondary battery group 40 to the control device 20, which is a slave device. Upon receiving the control signal, the control device 20 periodically transmits to the secondary battery group 40 a control signal for closing the switches 41 and 42 of the secondary battery group 40 . Therefore, while the control device 20 is activated, the switches 41 and 42 of the secondary battery group 40 are closed, and the secondary battery group 40 is closed. On the other hand, when the control device 20 is reset, the control signal is not transmitted to the secondary battery group 40, so the switches 41 and 42 of the secondary battery group 40 are opened, and the secondary battery group 40 is in an open state.

FIG. 3 is a flowchart showing an example of processing executed by the control devices 10 and 20. As shown in FIG. A case where the control device 10 executes the process will be described below.

In step S101, the reset detection unit 14 of the control device 10 determines whether or not the control device 20 has been reset. If the controller 20 has not been reset (NO), the process of step S101 is executed again. If the control device 20 has been reset (YES), the process branches to step S102. In this case, the secondary battery group 40 controlled by the control device 20 is in the open state.

In step S102, the reset detector 14 determines whether or not the controller 20 is continuously reset. If the resets are continuously occurring (YES), the process of FIG. 3 ends. On the other hand, if the reset has not occurred consecutively (NO), the process branches to step S103.

At step S103, the setting unit 15 determines whether the control device 10 is the master device. If the control device 10 is not the master device (NO), the setting unit 15 sets the control device 10 as the master device in step S104. On the other hand, if the control device 10 is the master device (YES), the process branches to step S105.

In step S105, the activation detection unit 16 determines whether or not the reset control device 20 has been activated. If the control device 20 is not activated (NO), the process of step S105 is executed again. On the other hand, if the control device 20 has been activated (YES), the process branches to step S106.

At step S106, the control device 10 executes the voltage adjustment process shown in FIG. In step S107, the voltage difference determination unit 17 determines whether or not the voltage difference between the voltage C of the secondary battery group 30 in the closed state and the voltage O of the secondary battery group 40 in the open state is less than the first threshold. . In this embodiment, the first threshold value is the minimum value at which arcing may occur when the switch of the secondary battery group 40 in the open state is closed, and the switch may be welded in the closed state. Note that the first threshold value may be any value exceeding the minimum value.

If the voltage difference is greater than or equal to the first threshold (NO), the voltage adjustment process is performed again in step S106. On the other hand, if the voltage difference is less than the first threshold (YES), the switching control unit 19 transmits a control signal for closing the switch of the secondary battery group 40 to the control device 20 in step S108. , the process of FIG. 3 ends.

FIG. 4 is a diagram illustrating an example of voltage adjustment processing according to one embodiment. A case where the control device 10 executes the voltage adjustment process will be described below.

In step S201, the voltage difference determination unit 17 determines whether or not the voltage C of the secondary battery group 30 in the closed state is higher than the voltage O of the secondary battery group 40 in the open state by a first threshold or more. If the voltage C is higher than the voltage O by the first threshold or more (YES), the process branches to step S202.

In step S<b>202 , the charge/discharge control unit 18 transmits a control signal for suppressing charging of the secondary battery group 30 in the closed state to the in-vehicle electronic device 50 . In step S203, the voltage difference determination unit 17 determines whether the voltage C is higher than the voltage O by a second threshold or more. The second threshold is a value higher than the first threshold and can be a value equal to or less than the maximum voltage value that the secondary battery groups 30 and 40 can take.

If the voltage C is not higher than the voltage O by the second threshold or more (NO), the voltage adjustment process ends. On the other hand, if the voltage C is higher than the voltage O by the second threshold or more (YES), the process branches to step S204. In step S204, the charge/discharge control unit 18 transmits a control signal for promoting discharge of the closed secondary battery group 30 to the in-vehicle electronic device 50, and the voltage adjustment process ends.

If it is determined in step S201 that the voltage C is not higher than the voltage O by the first threshold or more (NO), the process branches to step S205. In step S205, the voltage difference determination unit 17 determines whether the voltage C is lower than the voltage O by a first threshold or more. If the voltage C is not lower than the voltage O by the first threshold or more (NO), that is, if the difference between the voltage C and the voltage O is less than the first threshold, the voltage adjustment process ends and the process proceeds to step S108 in FIG. Processing proceeds. On the other hand, if the voltage C is lower than the voltage O by the first threshold or more (YES), the process branches to step S206.

In step S<b>206 , the charge/discharge control unit 18 transmits a control signal for suppressing discharge of the secondary battery group 30 in the closed state to the in-vehicle electronic device 50 . In step S207, the voltage difference determination unit 17 determines whether the voltage C is lower than the voltage O by a second threshold or more. If the voltage C is not lower than the voltage O by the second threshold or more (NO), the voltage adjustment process ends. On the other hand, if the voltage C is lower than the voltage O by the second threshold or more (YES), the process branches to step S208. In step S208, the charge/discharge control unit 18 transmits a control signal for promoting charging of the closed secondary battery group 30 to the in-vehicle electronic device 50, and the voltage adjustment process ends.

In the above-described embodiment, when one of the secondary battery groups 30 and 40 changes from the closed state to the open state by resetting one of the control devices 10 and 20, the voltage difference determination unit of the control device that has not been reset 17 determines whether or not the voltage C of the secondary battery group in the closed state is higher than the voltage O of the secondary battery group in the open state by a first threshold or more. When the voltage C is higher than the voltage O by a first threshold or more, the charge/discharge control unit 18 suppresses charging of the closed secondary battery group. Then, when the voltage difference between the voltage C and the voltage O becomes less than the threshold, the switching control unit 19 closes the switch of the secondary battery group in the open state for the control device activated after the switching control unit 19 resets. Let

Thus, when the voltage C of the closed secondary battery group is higher than the voltage O of the open secondary battery group by the first threshold or more, charging of the closed secondary battery group is suppressed. In this state, when the on-vehicle electronic device 50 consumes the power of the secondary battery group in the closed state, the voltage C of the secondary battery group in the closed state decreases, and the difference between the voltage C and the voltage O becomes smaller. Then, when the difference between the voltage C and the voltage O reaches a value at which there is no possibility that the switch of the secondary battery group in the open state is welded, the switch of the secondary battery group in the open state is closed. Therefore, the electric power of the secondary battery group can be supplied to the in-vehicle electronic device 50 without welding the switch. This is useful because it is possible to release the restriction on the power supply to the in-vehicle electronic device 50 even when the vehicle is in operation, and the in-vehicle electronic device 50 can use more power.

Further, in the above-described embodiment, the voltage difference determination unit 17 of the control device that has not been reset determines whether or not the voltage C is higher than the voltage O by the second threshold or more. When the voltage C is higher than the voltage O by the second threshold or more, the charge/discharge control unit 18 further promotes discharging of the secondary battery group in the closed state.

Thereby, the value of the voltage C can be efficiently lowered, and the difference between the voltage C and the voltage O can be reduced. Therefore, the switch of the secondary battery group in the open state can be quickly closed, and the resumption of power supply from the secondary battery group to the in-vehicle electronic device 50 can be hastened.

Furthermore, in the above-described embodiment, when one of the secondary battery groups 30 and 40 is reset by one of the control devices 10 and 20 to open from the closed state, the voltage difference of the non-reset control device The determination unit 17 determines whether or not the voltage C of the secondary battery group in the closed state is lower than the voltage O of the secondary battery group in the open state by a first threshold or more. When the voltage C is lower than the voltage O by a first threshold value or more, the charge/discharge control unit 18 suppresses discharging of the secondary battery group in the closed state. Then, when the voltage difference between the voltage C and the voltage O becomes less than the threshold, the switching control unit 19 causes the control device activated after the reset to close the switch of the secondary battery group in the open state.

Thus, when the voltage C of the secondary battery group in the closed state is lower than the voltage O of the secondary battery group in the open state by the first threshold or more, discharging of the secondary battery group in the closed state is suppressed. In this state, when the secondary battery group in the closed state is charged with electric power generated using regenerative energy and electric power supplied by the auxiliary battery, the value of voltage C rises, and voltage C and voltage O the difference becomes smaller. Then, when the difference between the voltage C and the voltage O reaches a value at which there is no possibility of welding of the switch of the secondary battery group in the open state, the switch is closed. Therefore, the power of the secondary battery group can be supplied to the in-vehicle electronic device 50 without fusing the switch of the secondary battery group in the open state.

Further, in the above-described embodiment, the voltage difference determination unit 17 of the control device that has not been reset determines whether or not the voltage C is lower than the voltage O by the second threshold or more. When the voltage C is lower than the voltage O by the second threshold or more, the charge/discharge control unit 18 further promotes charging of the closed secondary battery group.

As a result, the value of the voltage C can be efficiently increased, and the difference between the voltage C and the voltage O can be reduced. Therefore, the switch of the secondary battery group in the open state can be quickly closed, and the resumption of power supply from the secondary battery group to the in-vehicle electronic device 50 can be hastened.

<Other embodiments>
In another embodiment, in the voltage adjustment process described above, if voltage C is higher than voltage O by a first threshold or more, or if voltage C is higher than voltage O by a second threshold or more, the closed secondary The temperature of the battery group may be increased. When the secondary battery groups 30 and 40 are provided with cooling fans, the charge/discharge control unit 18 transmits a control signal to reduce the rotational speed of the cooling fans to the secondary battery groups in the closed state. The cooling fan reduces its rotational speed upon receiving the control signal. As a result, the temperature of the secondary battery group rises due to the heat generated by the secondary battery group in the closed state.

When the temperature of the secondary battery groups 30 and 40 can be adjusted using an air conditioner provided in the vehicle, the charge/discharge control unit 18 instructs the controller that controls the air conditioner to increase the temperature of the closed secondary battery group. send a control signal to Upon receiving the control signal, the control device controls the air conditioner to increase the temperature of the secondary battery group in the closed state.

Generally, in a secondary battery group, when the temperature is high, the internal resistance and electromotive force decrease, and the voltage tends to decrease. Therefore, by increasing the temperature of the secondary battery group in the closed state, the voltage of the secondary battery group in the closed state can be lowered. As a result, the voltage difference between the voltage C of the secondary battery group in the closed state and the voltage O of the secondary battery group in the open state can be reduced.

In another embodiment, in the voltage adjustment process described above, if the voltage C is lower than the voltage O by a first threshold or more, or if the voltage C is lower than the voltage O by a second threshold or more, the closed state The temperature of the secondary battery group may be lowered. When the secondary battery groups 30 and 40 are provided with cooling fans, the charge/discharge control unit 18 transmits a control signal for increasing the rotational speed of the cooling fans to the secondary battery groups in the closed state. The cooling fan increases its rotational speed upon receiving the control signal. As a result, the secondary battery group in the closed state is cooled to lower the temperature.

When the temperature of the secondary battery groups 30 and 40 can be adjusted using an air conditioner provided in the vehicle, the charge/discharge control unit 18 causes the control device that controls the air conditioner to lower the temperature of the closed secondary battery group. send a control signal to Upon receiving the control signal, the control device controls the air conditioner to lower the temperature of the secondary battery group in the closed state.

Generally, when the temperature is low, the secondary battery group tends to have an increased internal resistance and an electromotive voltage, resulting in an increase in voltage. Therefore, by lowering the temperature of the closed secondary battery group, the voltage of the closed secondary battery group can be increased. As a result, the voltage difference between the voltage C of the secondary battery group in the closed state and the voltage O of the secondary battery group in the open state can be reduced.

Furthermore, if the in-vehicle electronic device 50 has a function of adjusting the power consumption of the in-vehicle electronic device 50 based on the state of charge (SOC) of the secondary battery groups 30 and 40, the control device 10 and 20 can notify the charging rate of the secondary battery groups 30 and 40 to the in-vehicle electronic device 50 . In this case, in the voltage adjustment process described above, if the voltage C is higher than the voltage O by a first threshold or more, or if the voltage C is higher than the voltage O by a second threshold or more, the charge/discharge control unit 18 closes the The in-vehicle electronic device 50 is notified of a higher charging rate than the actual charging rate of the secondary battery group in the state. Upon receiving the notification, the in-vehicle electronic device 50 consumes power according to a higher charging rate than the actual charging rate. Therefore, the in-vehicle electronic device 50 consumes more power than when the actual charging rate is notified. As a result, the amount of power consumed by the secondary battery group in the closed state increases, and the voltage C of the secondary battery group in the closed state decreases. Therefore, the voltage difference between the voltage C of the secondary battery group in the closed state and the voltage O of the secondary battery group in the open state is efficiently reduced.

On the other hand, when the voltage C is lower than the voltage O by the first threshold or more, or when the voltage C is lower than the voltage O by the second threshold or more, the charge/discharge control unit 18 determines whether the closed secondary battery group notifies the in-vehicle electronic device 50 of the charging rate lower than the charging rate of . Upon receiving the notification, the in-vehicle electronic device 50 consumes power according to a lower charging rate than the actual charging rate. Therefore, the in-vehicle electronic device 50 consumes less power than when the actual charging rate is notified. As a result, the amount of power consumed by the secondary battery group in the closed state is reduced. Therefore, the secondary battery group in the closed state can be efficiently charged with electric power generated using regenerative energy and electric power supplied from the auxiliary battery. As a result, the difference between the voltage C and the voltage O can be reduced in a shorter time than when the actual charging rate is notified.

Furthermore, in another embodiment, in the above-described voltage adjustment process, when the voltage C is higher than the voltage O by a first threshold or more, the discharge of the closed secondary battery group is promoted and the closed secondary battery group is discharged. Group charging may be suppressed. Thereby, the difference between the voltage C and the voltage O can be reduced more quickly.

Furthermore, in another embodiment, in the voltage adjustment process described above, when the voltage C is lower than the voltage O by a first threshold or more, charging of the closed secondary battery group is promoted and the closed secondary battery group is charged. Group discharge may be suppressed. Thereby, the difference between the voltage C and the voltage O can be reduced more quickly.

Furthermore, in another embodiment, in the voltage adjustment process described above, if the voltage C is higher than the voltage O by a first threshold or more, discharging of the closed secondary battery group may be promoted. In this case, when the voltage C is higher than the voltage O by the second threshold or more, charging of the secondary battery group in the closed state can be further suppressed.

Furthermore, in another embodiment, in the voltage adjustment process described above, if the voltage C is lower than the voltage O by a first threshold or more, charging of the closed secondary battery group may be promoted. In this case, when the voltage C is lower than the voltage O by the second threshold or more, discharging of the secondary battery group in the closed state can be further suppressed.

Furthermore, in another embodiment, if the difference between the voltage C and the voltage O is less than the first threshold in the voltage adjustment process described above, charging or discharging of the closed secondary battery group may be promoted. In this case, when voltage C is higher than voltage O, charging of the closed secondary battery group is promoted. On the other hand, when the voltage C is lower than the voltage O, the discharge of the secondary battery group in the closed state is promoted.

Furthermore, in another embodiment, the control system 1 may be configured with three or more secondary battery groups connected in parallel and three or more control devices that respectively control these secondary battery groups. Each control device executes the processing described with reference to FIGS. In this embodiment, when two or more control devices are reset, the master device controls each voltage O of the open secondary battery group controlled by each of the two or more reset control devices, and the closed secondary battery Compare with voltage C of the group. Further, in this embodiment, when the control device set as the master device is reset, in step S104 of FIG. executes the processing after step S105 in FIG.

Various methods can be adopted for selecting one control device from among a plurality of control devices as the master device. For example, each control device stores priority information defining its own priority in the storage device 12, and in step S104 in FIG. to other controllers. Each control device compares the priority in the priority information received from other control devices with the priority indicated by the priority information of its own device, and if its own device has the highest priority, it designates itself as the master device. can be set as

Furthermore, in another embodiment, the voltage difference between the secondary battery group in the closed state and the secondary battery group in the open state may be reduced by using a cell balance function that equalizes the energy capacities of the secondary battery groups. good.

In the above examples, the programs can be stored and provided to the computer using various types of non-transitory computer readable media. Non-transitory computer-readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (eg, floppy disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical discs), CD-ROMs, CD-Rs, CD-Rs /W, including semiconductor memory (eg, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM); The program may also be provided to the computer on various types of transitory computer readable medium. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. Transitory computer-readable media can deliver the program to the computer via wired channels, such as wires and optical fibers, or wireless channels.

The present invention is not limited to the above-described embodiments, and can be modified as appropriate without departing from the scope of the present invention.

1 control system 10 control device 17 voltage difference determination unit 18 charge/discharge control unit 19 switching control unit 20 control device 30 secondary battery group 40 secondary battery group

Claims (9)

A control device for controlling a plurality of secondary battery groups connected in parallel,
When at least one secondary battery group among the plurality of secondary battery groups changes from the closed state to the open state, the voltage difference between the secondary battery group in the open state and the secondary battery group in the closed state is determined. a voltage difference determination unit;
a charge/discharge control unit that controls charge/discharge of the closed secondary battery group according to the determination result of the voltage difference determination unit;
an opening/closing control unit that controls opening and closing of the switch of the secondary battery group in the open state according to the determination result of the voltage difference determination unit;
The voltage difference determination unit determines whether the voltage of the secondary battery group in the closed state is higher than the voltage of the secondary battery group in the open state by a threshold value or more,
When the voltage of the secondary battery group in the closed state is higher than the voltage of the secondary battery group in the open state by a threshold value or more, the charge/discharge control unit suppresses charging and discharges the secondary battery group in the closed state. at least one of the facilitation,
The switching control unit closes the switch of the open secondary battery group when a difference between the voltage of the closed secondary battery group and the voltage of the open secondary battery group becomes less than a threshold. ,
The threshold is a first threshold,
When the voltage of the secondary battery group in the closed state is higher than the voltage of the secondary battery group in the open state by the first threshold value or more, the charge/discharge control unit charges the secondary battery group in the closed state. When either suppression of discharge or promotion of discharge is performed,
The voltage difference determination unit further determines whether or not the voltage of the secondary battery group in the closed state is higher than the voltage of the secondary battery group in the open state by a second threshold or more,
The second threshold is a value higher than the first threshold,
When the voltage of the secondary battery group in the closed state is higher than the voltage of the secondary battery group in the open state by the second threshold value or more, the charge/discharge control unit stops charging the secondary battery group in the closed state. both suppressing and promoting discharge,
Control device. A control device for controlling a plurality of secondary battery groups connected in parallel,
When at least one secondary battery group among the plurality of secondary battery groups changes from the closed state to the open state, the voltage difference between the secondary battery group in the open state and the secondary battery group in the closed state is determined. a voltage difference determination unit;
a charge/discharge control unit that controls charge/discharge of the closed secondary battery group according to the determination result of the voltage difference determination unit;
an opening/closing control unit that controls opening and closing of the switch of the secondary battery group in the open state according to the determination result of the voltage difference determination unit;
The voltage difference determination unit determines whether the voltage of the secondary battery group in the closed state is higher than the voltage of the secondary battery group in the open state by a threshold value or more,
When the voltage of the secondary battery group in the closed state is higher than the voltage of the secondary battery group in the open state by a threshold value or more, the charge/discharge control unit suppresses charging and discharges the secondary battery group in the closed state. at least one of the facilitation,
The switching control unit closes the switch of the open secondary battery group when a difference between the voltage of the closed secondary battery group and the voltage of the open secondary battery group becomes less than a threshold. ,
The charge/discharge control unit further
when the voltage of the closed secondary battery group is higher than the voltage of the open secondary battery group by the threshold value or more, increasing the temperature of the closed secondary battery group;
Control device. A control device for controlling a plurality of secondary battery groups connected in parallel,
When at least one secondary battery group among the plurality of secondary battery groups changes from the closed state to the open state, the voltage difference between the secondary battery group in the open state and the secondary battery group in the closed state is determined. a voltage difference determination unit;
a charge/discharge control unit that controls charge/discharge of the closed secondary battery group according to the determination result of the voltage difference determination unit;
an opening/closing control unit that controls opening and closing of the switch of the secondary battery group in the open state according to the determination result of the voltage difference determination unit;
The voltage difference determination unit determines whether the voltage of the secondary battery group in the closed state is higher than the voltage of the secondary battery group in the open state by a threshold value or more,
When the voltage of the secondary battery group in the closed state is higher than the voltage of the secondary battery group in the open state by a threshold value or more, the charge/discharge control unit suppresses charging and discharges the secondary battery group in the closed state. at least one of the facilitation,
The switching control unit closes the switch of the open secondary battery group when a difference between the voltage of the closed secondary battery group and the voltage of the open secondary battery group becomes less than a threshold. ,
When the voltage of the secondary battery group in the closed state is higher than the voltage of the secondary battery group in the open state by the threshold value or more, the charge/discharge control unit controls the actual charging rate of the secondary battery group in the closed state. notifies the on-board electronics of a high charging rate,
Control device. A control device for controlling a plurality of secondary battery groups connected in parallel,
When at least one secondary battery group among the plurality of secondary battery groups changes from the closed state to the open state, the voltage difference between the secondary battery group in the open state and the secondary battery group in the closed state is determined. a voltage difference determination unit;
a charge/discharge control unit that controls charge/discharge of the closed secondary battery group according to the determination result of the voltage difference determination unit;
an opening/closing control unit that controls opening and closing of the switch of the secondary battery group in the open state according to the determination result of the voltage difference determination unit;
The voltage difference determination unit determines whether the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by a threshold value or more,
When the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by a threshold value or more, the charging/discharging control unit suppresses discharging and charging of the secondary battery group in the closed state. at least one of the facilitation,
The switching control unit closes the switch of the open secondary battery group when a difference between the voltage of the closed secondary battery group and the voltage of the open secondary battery group becomes less than a threshold. ,
The threshold is a first threshold,
When the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by the first threshold value or more, the charge/discharge control unit discharges the secondary battery group in the closed state. When either suppression of charging or promotion of charging is performed,
The voltage difference determination unit further determines whether the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by a second threshold or more,
The second threshold is a value higher than the first threshold,
When the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by the second threshold value or more, the charge/discharge control unit prevents the secondary battery group in the closed state from discharging. both suppressing and promoting charging,
Control device. A control device for controlling a plurality of secondary battery groups connected in parallel,
When at least one secondary battery group among the plurality of secondary battery groups changes from the closed state to the open state, the voltage difference between the secondary battery group in the open state and the secondary battery group in the closed state is determined. a voltage difference determination unit;
a charge/discharge control unit that controls charge/discharge of the closed secondary battery group according to the determination result of the voltage difference determination unit;
an opening/closing control unit that controls opening and closing of the switch of the secondary battery group in the open state according to the determination result of the voltage difference determination unit;
The voltage difference determination unit determines whether the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by a threshold value or more,
When the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by a threshold value or more, the charging/discharging control unit suppresses discharging and charging of the secondary battery group in the closed state. at least one of the facilitation,
The switching control unit closes the switch of the open secondary battery group when a difference between the voltage of the closed secondary battery group and the voltage of the open secondary battery group becomes less than a threshold. ,
The charge/discharge control unit further
when the voltage of the closed secondary battery group is lower than the voltage of the open secondary battery group by the threshold value or more, reducing the temperature of the closed secondary battery group;
Control device. A control device for controlling a plurality of secondary battery groups connected in parallel,
When at least one secondary battery group among the plurality of secondary battery groups changes from the closed state to the open state, the voltage difference between the secondary battery group in the open state and the secondary battery group in the closed state is determined. a voltage difference determination unit;
a charge/discharge control unit that controls charge/discharge of the closed secondary battery group according to the determination result of the voltage difference determination unit;
an opening/closing control unit that controls opening and closing of the switch of the secondary battery group in the open state according to the determination result of the voltage difference determination unit;
The voltage difference determination unit determines whether the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by a threshold value or more,
When the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by a threshold value or more, the charging/discharging control unit suppresses discharging and charging of the secondary battery group in the closed state. at least one of the facilitation,
The switching control unit closes the switch of the open secondary battery group when a difference between the voltage of the closed secondary battery group and the voltage of the open secondary battery group becomes less than a threshold. ,
When the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by the threshold value or more, the charge/discharge control unit controls the actual charging rate of the secondary battery group in the closed state. notifies the on-vehicle electronics of a low charging rate,
Control device. The voltage difference determination unit further determines whether the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by a threshold value or more,
When the voltage of the secondary battery group in the closed state is lower than the voltage of the secondary battery group in the open state by a threshold value or more, the charging/discharging control unit suppresses discharging and charging of the secondary battery group in the closed state. A control device according to any one of claims 1 to 3 , which performs at least one of acceleration. 3. The first threshold value is a value equal to or greater than a minimum value at which an arc is generated when the switch of the secondary battery group in the open state is closed, and welding may occur in the closed state of the switch. 5. The control device according to 1 or 4 . 3. The threshold value is a value equal to or greater than a minimum value at which arcing may occur when the switch of the secondary battery group in the open state is closed and welding may occur in the closed state of the switch. , or the control device according to any one of 5 to 7.

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