JP2022092500A - Battery temperature adjustment device - Google Patents

Abstract

To provide a battery temperature adjustment device for adjusting the temperature of a secondary battery that a battery pack mounted in a vehicle includes, in which a decrease in the electric power supplied to loads other than a heater that are mounted to the vehicle is suppressed.SOLUTION: A battery temperature adjustment device 1 is constituted by comprising: a heat accumulator 3 for exchanging heat between a heater H and a heat medium; a path 4 for connecting the heat accumulator 3 and a battery pack 2 with each other; a battery pack side switching unit 5 for switching the battery pack side opening of the path 4 to an open state or a closed state; a heat accumulator side switching unit 6 for switching the heat accumulator side opening of the path 4 to an open state or a closed state; and a control unit 7. The control unit 7 drives the heater H while a secondary battery B is being charged to accumulate heat in the heat medium and stops the heater H while a vehicle Ve is in operation, as well as places the battery pack side opening and the heat accumulator side opening into an open state so that the temperature of the secondary battery B rises as heat is exchanged between the heat medium and the secondary battery B.SELECTED DRAWING: Figure 1

Description

The present invention relates to a battery temperature control device that adjusts the temperature of a secondary battery contained in a battery pack mounted on a vehicle.

As a battery temperature control device, there is a device that drives a heater by electric power supplied from a secondary battery to a heater and raises the temperature of the secondary battery by generating heat from the heater. Patent Document 1 is a related technique.

However, in the battery temperature control device, since the power of the secondary battery is consumed by driving the heater, there is a concern that the power supplied to the load other than the heater mounted on the vehicle is reduced.

Japanese Unexamined Patent Publication No. 2016-201321

An object of the present invention is to reduce power supplied to a load other than a heater mounted on a vehicle in a battery temperature control device for adjusting the temperature of a secondary battery contained in a battery pack mounted on the vehicle. It is to suppress that.

The battery temperature control device according to the present invention is a battery temperature control device that adjusts the temperature of the secondary battery of the battery pack mounted on the vehicle, and is based on the power supplied from the secondary battery. A heat storage device having a driven heater and exchanging heat between the heater and the heat medium, a path through which the heat storage device and the battery pack are connected to each other, and a battery pack of the path, and a battery pack of the path. The battery pack side switching unit that switches the side opening to the open state or the closed state, the heat storage device side switching unit that switches the heat storage device side opening of the path to the open state or the closed state, the heater, and the battery pack side switching unit. , And a control unit that controls the operation of the heat storage device side switching unit, and the control unit drives the heater to store heat in the heat medium while the secondary battery is being charged, and the vehicle is in operation. , The battery pack side opening and the heat storage device side opening so that the temperature of the secondary battery rises by stopping the heater and exchanging heat between the heat medium and the secondary battery. Open the part.

As a result, when the temperature of the secondary battery is raised while the vehicle is in operation, the electric power supplied from the secondary battery is not consumed by the heater, so that the electric power supplied to the load other than the heater mounted on the vehicle is reduced. Can be suppressed.

Further, the battery temperature control device is a radiator side switching unit that is connected to the path and exchanges heat between the outside air and the heat medium, and a radiator side switching unit that switches the radiator side opening of the path to an open state or a closed state. The control unit may be configured to switch the radiator side opening to an open state or a closed state based on the temperatures of the heat exchanger and the secondary battery.

As a result, the temperature of the secondary battery and the heat storage can be adjusted by the outside air, so that the power consumption of the secondary battery can be suppressed and the power supplied to the load other than the heater mounted on the vehicle is reduced. That can be further suppressed.

Further, the control unit is in the case where the temperature of the heat storage device is higher than the temperature threshold while the vehicle is in operation, and the temperature of the secondary battery is from the low temperature side threshold value to the high temperature side threshold value larger than the low temperature side threshold value. When it is within the range, the battery pack side opening, the heat storage device side opening, and the radiator side opening are closed to keep the secondary battery warm, and the heat storage device is operated while the vehicle is in operation. When the temperature of the secondary battery is larger than the temperature threshold and the temperature of the secondary battery is smaller than the low temperature side threshold, the battery pack side opening and the heat storage device side opening are opened and the radiator side. When the temperature of the secondary battery is raised by the heat medium moving from the heat storage device to the battery pack by closing the opening, and the temperature of the heat storage device is higher than the temperature threshold value while the vehicle is in operation. When the temperature of the secondary battery is higher than the high temperature side threshold, the battery pack side opening and the radiator side opening are opened and the heat storage side opening is closed. The secondary battery may be configured to be cooled by the heat medium moving from the radiator to the battery pack.

As a result, the temperature of the secondary battery can be adjusted by the heat storage device or the radiator while the vehicle is in operation.

Further, when the temperature of the heat storage device is equal to or lower than the temperature threshold while the vehicle is in operation, and the temperature of the secondary battery is larger than the high temperature side threshold value larger than the low temperature side threshold value, the control unit may use the control unit. The battery pack side opening and the heat storage device side opening are opened and the radiator side opening is closed, and the secondary battery is cooled by the heat medium that moves from the heat storage device to the battery pack. When the temperature of the heat storage device is equal to or lower than the temperature threshold value and the temperature of the secondary battery is equal to or lower than the high temperature side threshold value while the vehicle is in operation, the heat storage device side opening and the radiator side are used. The opening may be opened and the battery pack side opening may be closed so that the heat storage medium is cooled by the heat medium moving from the radiator to the heat storage device.

As a result, the temperature of the secondary battery or the heat storage device can be adjusted by the heat storage device or the radiator while the vehicle is in operation.

Further, when the temperature of the heat storage device is higher than the temperature threshold during charging of the secondary battery, the control unit opens the battery pack side opening and the radiator side opening and opens the heat storage device side. The secondary battery may be cooled by the heat medium moving from the radiator to the battery pack by closing the unit.

As a result, the temperature of the secondary battery can be adjusted by the radiator while the secondary battery is being charged.

Further, when the temperature of the heat storage device is equal to or lower than the temperature threshold during charging of the secondary battery, the control unit opens the battery pack side opening and the heat storage device side opening and opens the radiator side. The secondary battery may be configured to be cooled or heated by the heat medium moving from the heat storage device to the battery pack by closing the opening.

As a result, the temperature of the secondary battery can be adjusted by the heat storage device while the secondary battery is being charged.

Further, the control unit drives the heater when the temperature of the heat storage device is equal to or lower than the drive stop threshold value, and stops the heater when the temperature of the heat storage device is larger than the drive stop threshold value of the vehicle. When the operating rate is smaller than the operating rate threshold value, the drive stop threshold value is increased by the first predetermined value, and when the operating rate is equal to or higher than the operating rate threshold value, the drive stop threshold value is decreased by the second predetermined value. It may be configured as follows.

As a result, when the operating rate of the vehicle is relatively low and the temperature of the secondary battery is relatively low, the frequency at which the heater is driven can be increased to raise the temperature of the heat storage device, and the operating rates of the vehicles can be compared. When the temperature of the secondary battery is relatively high, the heater can be stopped less frequently to lower the temperature of the rechargeable battery, thus optimizing the power required to raise the temperature of the secondary battery. can do.

Further, when the charge amount of the secondary battery becomes equal to or less than the charge amount threshold while the vehicle is in operation, the control unit opens the battery pack side opening and the radiator side opening and stores heat. The secondary battery may be cooled by the heat medium moving from the radiator to the battery pack by closing the container-side opening.

This allows the secondary battery to be cooled in preparation for the next charge of the secondary battery while the vehicle is in operation.

Further, the battery temperature control device may be provided between the battery pack side switching unit and the heat storage device side switching unit, and may be configured to include a flow rate control valve for controlling the flow rate of the heat medium.

As a result, it is possible to shorten the time required to bring the temperature of the secondary battery to the target temperature.

According to the present invention, in the battery temperature control device for adjusting the temperature of the secondary battery of the battery pack mounted on the vehicle, it is possible to suppress the reduction of the electric power supplied to the load other than the heater mounted on the vehicle. be able to.

It is a figure which shows an example of the battery temperature control device of 1st Embodiment. It is a flowchart which shows an example of the operation of the control part of 1st Embodiment. An example of the relationship between the temperature of the heat storage device and the driving state of the heater, the relationship between the charge amount of the secondary battery and the electric power supplied to the heater, and the relationship between the temperature of the secondary battery and the electric power supplied to the heater is shown. It is a figure. It is a figure which shows an example of the battery temperature control device of 2nd Embodiment. It is a flowchart which shows an example of the operation of the control part of 2nd Embodiment. It is a figure which shows the modification of the battery temperature control device of 1st Embodiment. It is a figure which shows the modification of the battery temperature control device of 2nd Embodiment.

Hereinafter, embodiments will be described in detail with reference to the drawings.

<First Embodiment>
FIG. 1 is a diagram showing an example of the battery temperature control device of the first embodiment.

The battery temperature control device 1 shown in FIG. 1 adjusts the temperature of the secondary battery B included in the battery pack 2 mounted on a vehicle Ve such as a forklift or an electric vehicle. The secondary battery B is composed of one or more rechargeable batteries such as a lithium ion battery or a nickel hydrogen battery.

Further, the battery temperature control device 1 includes a heat storage device 3, a path 4, a battery pack side switching unit 5, a heat storage device side switching unit 6, a fan F1, and a control unit 7.

The heat storage device 3 has a heater H driven by electric power supplied from the secondary battery B. The heater H exchanges heat with a heat medium (antifreeze, air, etc.). That is, when electric power is supplied from the secondary battery B to the heater H to drive the heater H, the heater H generates heat and the heat medium in the heat storage device 3 stores heat.

The path 4 is composed of pipes or the like, and connects the heat storage device 3 and the battery pack 2 to each other. Further, a heat medium passes through the path 4.

The battery pack side switching unit 5 is composed of a valve or the like, and switches an opening (battery pack side opening) in the vicinity of the battery pack 2 in the path 4 to an open state or a closed state. When the battery pack side opening is in the open state, the heat medium can be moved between the path 4 and the battery pack 2, and when the battery pack side opening is in the closed state, the path 4 and the battery pack 2 and the like. It becomes impossible to move the heat medium between them.

The heat storage side switching portion 6 is composed of a valve or the like, and switches an opening (heat storage side opening) in the vicinity of the heat storage 3 in the path 4 to an open state or a closed state. When the heat storage side opening is in the open state, the heat medium can move between the path 4 and the heat storage device 3, and when the heat storage device side opening is in the closed state, the path 4 and the heat storage device 3 are in a closed state. The heat medium cannot move between and.

The fan F1 is provided in the path 4 between the heat storage device 3 and the battery pack 2, and circulates the heat medium in the path 4.

The control unit 7 is composed of a microcomputer or the like, and controls the operations of the heater H, the battery pack side switching unit 5, the heat storage device side switching unit 6, and the fan F1.

FIG. 2 is a flowchart showing an example of the operation of the control unit 7 of the first embodiment.

First, the control unit 7 determines whether or not the secondary battery B is being charged and whether or not the vehicle Ve is in operation for each control cycle (steps S101 and S102). For example, the control unit 7 ends the charging of the secondary battery B after receiving the information sent from the charging control unit that controls the charging of the secondary battery B indicating that the charging of the secondary battery B has started. It is determined that the secondary battery B is being charged during the period until the information indicating the above is received, and it is determined that the secondary battery B is not being charged during the other period. Further, the control unit 7 receives the information indicating that the operation of the vehicle Ve has started and then the information indicating that the operation of the vehicle Ve has ended, which is sent from the travel control unit that controls the travel of the vehicle Ve. It is determined that the vehicle Ve is in operation during the period until it is received, and it is determined that the vehicle Ve is not in operation during the other period. The travel control unit starts the operation of the vehicle Ve by a key-on operation by a user or the like, and ends the operation of the vehicle Ve by a key-off operation.

Next, when the control unit 7 determines that the secondary battery B is being charged (step S101: Yes), the control unit 7 drives the heater H and closes the battery pack side opening and the heat storage side opening. The operation of the battery pack side switching unit 5 and the heat storage device side switching unit 6 is controlled so as to be so that the fan F1 is stopped (step S103). As a result, the heat storage device 3 can be sealed and the heater H can be heated, so that the heat generated by the heater H can be used to efficiently store the heat medium in the heat storage device 3.

In the control unit 7, the total power of the power required for charging the secondary battery B and the power required for driving the heater H while the secondary battery B is being charged is not shown on the outside of the vehicle Ve. It may be configured to instruct the charge control unit to be supplied to the battery pack 2 from the charger of the above. As a result, it is possible to prevent the power supplied to the load other than the heater H mounted on the vehicle Ve from being reduced while the vehicle Ve is in operation.

Further, in step S103, when the temperature of the heat storage device 3 is equal to or lower than the drive stop threshold value, the control unit 7 drives the heater H, and the temperature of the heat storage device 3 is the drive stop threshold value. If it is larger than that, the heater H may be configured to be stopped. The drive stop threshold is, for example, the rated temperature of the heat storage device 3.

Alternatively, when the heater H is being driven in step S103, the control unit 7 charges the secondary battery B as shown in FIG. 3 (b) (voltage or charge rate of the secondary battery B (secondary battery B). Refer to the information D1 indicating the relationship between the current charge capacity to the full charge capacity))) and the power supplied to the heater H, and obtain the supply power of the heater H corresponding to the current charge amount of the secondary battery B. It may be configured in. In the information D1 shown in FIG. 3B, it is assumed that the electric power supplied to the heater H increases as the charge amount of the secondary battery B increases. Further, it is assumed that the temperature of the heater H becomes higher as the electric power supplied to the heater H becomes larger. As a result, the higher the charge amount of the secondary battery B, the higher the temperature of the heater H can be. The relationship between the charge amount of the secondary battery B and the power supply of the heater H may be non-linear.

Alternatively, the control unit 7 refers to the information D2 indicating the relationship between the temperature of the secondary battery B shown in FIG. 3C and the electric power supplied to the heater H when the heater H is being driven in step S103. , The power supply of the heater H corresponding to the current temperature of the secondary battery B may be obtained. In the information D2 shown in FIG. 3C, it is assumed that the lower the temperature of the secondary battery B, the larger the electric power supplied to the heater H. As a result, the lower the temperature of the secondary battery B, the higher the temperature of the heater H can be.

Alternatively, when the heater H is being driven in step S103, the control unit 7 refers to the information D1 shown in FIG. 3B and the information D2 shown in FIG. 3C, and refers to the current information D2 of the secondary battery B. The power supplied by the heater H corresponding to the amount of charge and the power supplied by the heater H corresponding to the current temperature of the secondary battery B are obtained, and the larger of the supplied powers is supplied to the heater H. It may be configured to be adopted as.

Further, in the flowchart shown in FIG. 2, when the control unit 7 determines that the vehicle Ve is in operation (step S102: Yes), the heater H is stopped and the battery pack side opening and the heat storage side opening are opened. The operation of the battery pack side switching unit 5 and the heat storage device side switching unit 6 is controlled so that the fan F1 is driven (step S104). As a result, while the secondary battery B is being charged, the stored heat medium moves from the heat storage device 3 to the battery pack 2, and heat is exchanged between the heat medium and the secondary battery B. Therefore, the secondary battery B is charged. Can be heated.

As described above, according to the battery temperature control device 1 of the first embodiment, the heater H is driven to store the heat medium while the secondary battery B is being charged, and the heater H is stopped while the vehicle Ve is in operation. At the same time, the temperature of the secondary battery B is raised by using the heat storage medium. As a result, since the electric power supplied from the secondary battery B is not consumed by the heater H during the operation of the vehicle Ve, it is possible to suppress the reduction of the electric power supplied to the load other than the heater H mounted on the vehicle Ve. Can be done.

<Second Embodiment>
FIG. 4 is a diagram showing an example of the battery temperature control device of the second embodiment. In FIG. 4, the same components as those shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

The battery temperature control device 1 shown in FIG. 4 includes a heat storage device 3, a path 4, a battery pack side switching unit 5, a heat storage device side switching unit 6, a fan F1, a control unit 7, a radiator 8, and a radiator. A side switching unit 9, a fan F2, and a fan F3 are provided.

The radiator 8 is a cooling device and is connected to the path 4. Further, in the radiator 8, heat exchange is performed between the outside air and the heat medium.

The radiator side switching portion 9 is composed of a valve or the like, and switches an opening (radiator side opening) in the vicinity of the radiator 8 in the path 4 to an open state or a closed state. When the radiator side opening is open, the heat medium can move between the path 4 and the radiator 8, and when the radiator side opening is closed, the heat medium is between the path 4 and the radiator 8. The heat medium cannot move.

The fan F2 is provided in the path 4 between the heat storage device 3 and the radiator 8 and circulates the heat medium in the path 4.

The fan F3 is provided in the radiator 8 and increases the flow rate of the outside air passing through the radiator 8.

The control unit 7 operates the heater H, the battery pack side switching unit 5, the heat storage device side switching unit 6, the radiator side switching unit 9, and the fans F1 to F3 based on the temperatures of the heat storage device 3 and the secondary battery B. Control. The temperature of the heat storage device 3 and the secondary battery B is measured by a temperature sensor (not shown) such as a thermistor.

FIG. 5 is a flowchart showing an example of the operation of the control unit 7 of the second embodiment.

First, the control unit 7 determines whether or not the secondary battery B is being charged and whether or not the vehicle Ve is in operation for each control cycle (steps S201 and S202).

Next, the control unit 7 determines that the secondary battery B is being charged (step S201: Yes), and the temperature of the heat storage device 3 is larger than the temperature threshold (step S203: Yes). Operation of the battery pack side switching unit 5, the heat storage device side switching unit 6, and the radiator side switching unit 9 so that the pack side opening and the radiator side opening are opened and the heat storage device side opening is closed. And drives the fans F1 to F3 (step S204). As a result, the secondary battery B can be cooled by the heat medium that has exchanged heat with the outside air while the secondary battery B is being charged. The temperature threshold value may be set based on the rated temperature of the secondary battery B.

Further, in step S204, when the temperature of the heat storage device 3 is equal to or lower than the drive stop threshold value, the control unit 7 drives the heater H, and the temperature of the heat storage device 3 is the drive stop threshold value. If it is larger than that, the heater H may be configured to be stopped.

Alternatively, when the control unit 7 is driving the heater H in step S204, the control unit 7 refers to the information D1 shown in FIG. 3B, and supplies the power of the heater H corresponding to the current charge amount of the secondary battery B. May be configured to obtain.

Alternatively, when the heater H is being driven in step S204, the control unit 7 refers to the information D2 shown in FIG. 3C to supply the power supplied to the heater H corresponding to the current temperature of the secondary battery B. It may be configured as desired.

Alternatively, when the heater H is being driven in step S204, the control unit 7 refers to the information D1 shown in FIG. 3B and the information D2 shown in FIG. 3C, and refers to the current information D2 of the secondary battery B. The power supplied by the heater H corresponding to the amount of charge and the power supplied by the heater H corresponding to the current temperature of the secondary battery B are obtained, and the larger of the supplied powers is supplied to the heater H. It may be configured to be adopted as.

Further, in the flowchart shown in FIG. 5, the control unit 7 determines that the secondary battery B is being charged (step S201: Yes), and the temperature of the heat storage device 3 is equal to or lower than the temperature threshold value (step S201: Yes). Step S203: No), the battery pack side switching unit 5, the heat storage device side switching unit 6, and the battery pack side switching unit 5 so that the heat storage device side opening and the battery pack side opening state are opened and the radiator side opening state is closed. While controlling the operation of the radiator side switching unit 9, only the fan F1 is driven (step S205). As a result, when the heater H is stopped while the secondary battery B is being charged, the secondary battery B can be cooled by the heat medium that has exchanged heat with the heat storage device 3. Further, when the heater H is being driven while the secondary battery B is being charged, the temperature of the secondary battery B can be raised by the heat medium exchanged with the heat storage device 3.

Further, the control unit 7 determines that the vehicle Ve is in operation (step S202: Yes), and the temperature of the heat storage device 3 is larger than the temperature threshold (step S206: Yes), and two. When the temperature of the next battery B is within the range from the low temperature side threshold to the high temperature side threshold (step S207: No, step S208: No), the heater H is stopped, and the battery pack side opening and the heat storage side opening are opened. , And the operation of the battery pack side switching unit 5, the heat storage device side switching unit 6, and the radiator side switching unit 9 is controlled so that the radiator side opening is closed, and the fans F1 to F3 are stopped (step). S209). The high temperature side threshold value may be an upper limit value of the rated temperature of the secondary battery B. Further, the low temperature side threshold value may be a lower limit value of the rated temperature of the secondary battery B. As a result, the secondary battery B can be kept at an appropriate temperature (range from the lower limit value to the upper limit value of the rated temperature), so that deterioration of the secondary battery B can be suppressed.

Further, the control unit 7 determines that the vehicle Ve is in operation (step S202: Yes), and the temperature of the heat storage device 3 is larger than the temperature threshold (step S206: Yes), and two. When the temperature of the next battery B is lower than the low temperature side threshold (step S207: Yes), the heater H is stopped, the heat storage device side opening and the battery pack side opening are opened, and the radiator side opening is closed. The operation of the battery pack side switching unit 5, the heat storage device side switching unit 6, and the radiator side switching unit 9 is controlled so as to be, and only the fan F1 is driven (step S205). As a result, the temperature of the secondary battery B can be raised by the heat medium exchanged with the heat storage device 3 while the vehicle Ve is in operation.

Further, the control unit 7 determines that the vehicle Ve is in operation (step S202: Yes), and the temperature of the heat storage device 3 is larger than the temperature threshold (step S206: Yes), and two. When the temperature of the next battery B is higher than the high temperature side threshold (step S207: No, step S208: Yes), the heater H is stopped, the battery pack side opening and the radiator side opening are opened, and the heat storage side is opened. The operations of the battery pack side switching unit 5, the heat storage side switching unit 6, and the radiator side switching unit 9 are controlled so that the opening is closed, and the fans F1 to F3 are driven (step S210). As a result, the secondary battery B can be cooled by the heat medium that has exchanged heat with the outside air while the vehicle Ve is in operation.

Further, the control unit 7 determines that the vehicle Ve is in operation (step S202: Yes), and the temperature of the heat storage device 3 is equal to or lower than the temperature threshold value (step S206: No), and When the temperature of the secondary battery B is higher than the high temperature side threshold value (step S211: Yes), the heater H is stopped, the heat storage side opening and the battery pack side opening are opened, and the radiator side opening is closed. The operation of the battery pack side switching unit 5, the heat storage side switching unit 6, and the radiator side switching unit 9 is controlled so as to be in the state, and only the fan F1 is driven (step S205). As a result, the secondary battery B can be cooled by the heat medium exchanged with the heat storage device 3 while the vehicle Ve is in operation.

Further, the control unit 7 determines that the vehicle Ve is in operation (step S202: Yes), and the temperature of the heat storage device 3 is equal to or lower than the temperature threshold value (step S206: No), and When the temperature of the secondary battery B is equal to or lower than the high temperature side threshold value (step S211: No), the heater H is stopped, the heat storage side opening and the radiator side opening are opened, and the battery pack side opening is opened. The operation of the battery pack side switching unit 5, the heat storage side switching unit 6, and the radiator side switching unit 9 is controlled so as to be in the closed state, and only the fan F2 and the fan 3 are driven (step S212). As a result, the heat storage device 3 can be cooled by the heat medium that has exchanged heat with the outside air while the vehicle Ve is in operation. When the temperature of the heat storage device 3 is equal to or lower than the temperature threshold, it is determined that the operation of the vehicle Ve has elapsed for a predetermined time. Therefore, the heat storage device 3 is cooled to an appropriate temperature for the next charge and heat storage, and the next charge and the next charge You can prepare for storage.

In the flowchart shown in FIG. 5, steps S201, S203, S204, S211 and S212 may be omitted.

Further, in the flowchart shown in FIG. 5, steps S201, S203, and S204 may be omitted.

Further, in the flowchart shown in FIG. 5, steps S211 and S212 may be omitted.

As described above, in the battery temperature control device 1 of the second embodiment, similarly to the battery temperature control device 1 of the first embodiment, the heater H is driven to store heat in the heat medium while the secondary battery B is being charged. While the vehicle Ve is in operation, the heater H is stopped and the temperature of the secondary battery B is raised by using the heat storage medium. As a result, since the electric power supplied from the secondary battery B is not consumed by the heater H during the operation of the vehicle Ve, it is possible to suppress the reduction of the electric power supplied to the load other than the heater H mounted on the vehicle Ve. Can be done.

Further, since the battery temperature control device 1 of the second embodiment includes the radiator 8, the secondary battery B and the heat storage device 3 can be cooled by the outside air. As a result, during the operation of the vehicle Ve, the power of the secondary battery B is not consumed to cool the secondary battery B and the heat storage device 3, so that the power supplied to the load other than the heater H mounted on the vehicle Ve is supplied. The reduction can be further suppressed.

The present invention is not limited to the above embodiments, and various improvements and changes can be made without departing from the gist of the present invention.

<Modification 1>
In step S203 shown in FIG. 5, when the operating rate of the vehicle Ve is smaller than the operating rate threshold value, the control unit 7 increases the drive stop threshold value by the first predetermined value, and the operating rate of the vehicle Ve is equal to or higher than the operating rate threshold value. In some cases, the drive stop threshold may be configured to be smaller by a second predetermined value. The operating rate of the vehicle Ve is the ratio of the operating time of the vehicle Ve to the unit time. Further, the operating rate threshold value, the first predetermined value, and the second predetermined value are arbitrary values set by experiments, simulations, and the like.

As a result, when the operating rate of the vehicle Ve is relatively low and the temperature of the secondary battery B is relatively low, the frequency with which the heater H is driven can be increased to raise the temperature of the heat storage device 3, and the temperature of the vehicle Ve can be raised. When the operating rate of the comparative device is high and the temperature of the secondary battery B is relatively high, the frequency at which the heater H is stopped can be reduced to lower the temperature of the heat storage device 3, so that the temperature of the secondary battery B is raised. The power required to do so can be optimized.

<Modification 2>
When the vehicle Ve is in operation (step S202: Yes shown in FIG. 5) and the charge amount of the secondary battery B becomes equal to or less than the charge amount threshold value, the control unit 7 stops the heater H and stops the heater H. , Battery pack side switching part 5, heat storage side switching part 6, and radiator side switching part 9 so that the battery pack side opening and the radiator side opening are in the open state and the heat storage device side opening is in the closed state. The operation of the above may be controlled and the fans F1 to F3 may be driven.

As a result, the secondary battery B can be cooled in preparation for the next charge of the secondary battery B while the vehicle Ve is in operation.

<Modification 3>
As shown in FIG. 6 or 7, the battery temperature control device 1 of the first embodiment or the second embodiment may be configured to include a flow rate control unit 10 for controlling the flow rate of the heat medium. It is assumed that the flow rate control unit 10 is composed of a valve or the like and is provided between the battery pack side switching unit 5 and the heat storage device side switching unit 6. Further, the control unit 7 may be configured to control the operation of the flow rate control unit 10 according to an instruction from a user or the like.

As a result, by controlling the operation of the flow rate control unit 10 so that the flow rate of the heat medium increases, it is possible to shorten the time required to bring the temperature of the secondary battery B to the target temperature.

1 Battery temperature control device 2 Battery pack 3 Heat storage device 4 Path 5 Battery pack side switching unit 6 Heat storage device side switching unit 7 Control unit 8 Radiator 9 Radiator side switching unit Ve Vehicle B Secondary battery H Heater F1 to F3 Fan

Claims (9)

It is a battery temperature control device that adjusts the temperature of the secondary battery of the battery pack mounted on the vehicle.
A heat storage device having a heater driven by electric power supplied from the secondary battery and exchanging heat between the heater and a heat medium.
A path through which the heat medium is connected by connecting the heat storage device and the battery pack to each other,
The battery pack side switching unit that switches the battery pack side opening of the path to the open state or the closed state, and
A heat storage side switching unit that switches the heat storage side opening of the path to an open state or a closed state, and
A control unit that controls the operation of the heater, the battery pack side switching unit, and the heat storage device side switching unit.
Equipped with
The control unit drives the heater to store heat in the heat medium while charging the secondary battery, stops the heater while the vehicle is in operation, and between the heat medium and the secondary battery. A battery temperature control device, characterized in that the opening on the battery pack side and the opening on the heat storage device side are opened so that the temperature of the secondary battery rises as a result of heat exchange. The battery temperature control device according to claim 1.
A radiator connected to the path and exchanging heat between the outside air and the heat medium,
A radiator side switching unit that switches the radiator side opening of the path to an open state or a closed state,
Equipped with
The control unit is a battery temperature control device that switches the radiator-side opening to an open state or a closed state based on the temperatures of the heat storage device and the secondary battery. The battery temperature control device according to claim 2.
The control unit
When the temperature of the heat storage device is higher than the temperature threshold while the vehicle is in operation, and the temperature of the secondary battery is within the range from the low temperature side threshold to the high temperature side threshold larger than the low temperature side threshold, the said. The battery pack side opening, the heat storage device side opening, and the radiator side opening are closed to keep the secondary battery warm.
When the temperature of the heat storage device is higher than the temperature threshold value and the temperature of the secondary battery is smaller than the low temperature side threshold value during the operation of the vehicle, the battery pack side opening and the heat storage device side opening And the radiator side opening is closed, and the temperature of the secondary battery is raised by the heat medium that moves from the heat storage device to the battery pack.
When the temperature of the heat storage device is higher than the temperature threshold and the temperature of the secondary battery is higher than the high temperature side threshold during the operation of the vehicle, the battery pack side opening and the radiator side opening are opened. A battery temperature control device characterized in that the secondary battery is cooled by the heat medium moving from the radiator to the battery pack by opening the heat storage device side opening and closing the heat storage side opening. The battery temperature control device according to claim 2 or 3.
The control unit
When the temperature of the heat storage device is equal to or lower than the temperature threshold while the vehicle is in operation, and the temperature of the secondary battery is larger than the high temperature side threshold value larger than the low temperature side threshold value, the battery pack side opening and the said The opening on the heat storage side is opened and the opening on the radiator side is closed, and the secondary battery is cooled by the heat medium moving from the heat storage to the battery pack.
When the temperature of the heat storage device is equal to or lower than the temperature threshold value and the temperature of the secondary battery is equal to or lower than the high temperature side threshold value during operation of the vehicle, the heat storage device side opening and the radiator side opening The battery temperature control device is characterized in that the battery pack side opening is closed and the heat storage medium is cooled by the heat medium moving from the radiator to the heat storage device. The battery temperature control device according to any one of claims 2 to 4.
When the temperature of the heat storage device is higher than the temperature threshold during charging of the secondary battery, the control unit opens the battery pack side opening and the radiator side opening and opens the heat storage device side opening. A battery temperature control device, characterized in that the secondary battery is cooled by the heat medium that moves from the radiator to the battery pack in a closed state. The battery temperature control device according to any one of claims 2 to 4.
When the temperature of the heat storage device is equal to or lower than the temperature threshold during charging of the secondary battery, the control unit opens the battery pack side opening and the heat storage device side opening and the radiator side opening. A battery temperature control device, characterized in that the secondary battery is cooled or heated by the heat medium that moves from the heat storage device to the battery pack. The battery temperature control device according to any one of claims 2 to 4.
The control unit
When the temperature of the heat storage device is equal to or lower than the drive stop threshold value, the heater is driven to drive the heater.
When the temperature of the heat storage device is larger than the drive stop threshold value, the heater is stopped and the heater is stopped.
When the operating rate of the vehicle is smaller than the operating rate threshold value, the drive stop threshold value is increased by a first predetermined value.
A battery temperature control device characterized in that when the operating rate is equal to or higher than the operating rate threshold value, the drive stop threshold value is reduced by a second predetermined value. The battery temperature control device according to any one of claims 2 to 4.
When the charge amount of the secondary battery becomes equal to or less than the charge amount threshold while the vehicle is in operation, the control unit opens the battery pack side opening and the radiator side opening and opens the heat storage side. A battery temperature control device, characterized in that the secondary battery is cooled by the heat medium that moves from the radiator to the battery pack with the opening closed. The battery temperature control device according to any one of claims 1 to 8.
A battery temperature control device provided between the battery pack side switching unit and the heat storage side switching unit and provided with a flow rate control valve for controlling the flow rate of the heat medium.

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