Vehicle

A vehicle comprising a battery, a power converter, a charger, a first and a second temperature adjustment circuit including a first and a second pumps for supplying a heat medium, a coupling passage which forms a coupling circuit by coupling the first and the second temperature adjustment circuits, a switching unit capable of switching a state between a circulation state and a non-circulation state, and a control device to select one mode from a plurality of modes. The plurality of modes includes a series mode in which the heat medium is circulated in the coupling circuit in the circulation state and a separate mode in which the heat medium is circulated in at least the second temperature adjustment circuit in the non-circulation state. The control device executes the series mode when charging the battery.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims the benefit of priority of Japanese Patent Application No. 2019-161229, filed on Sep. 4, 2019, the content of which is incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to a vehicle equipped with a battery and a power converter.

BACKGROUND ART

An electric vehicle which includes a first temperature adjustment circuit, a second temperature adjustment circuit, a pump which circulates a heat medium in at least one of the first temperature adjustment circuit and the second temperature adjustment circuit, a coupling passage which couples the first temperature adjustment circuit and the second temperature adjustment circuit to form a coupling circuit, and a switching unit capable of switching a state between a circulation state in which the heat medium circulates in the coupling circuit and a non-circulation state in which the heat medium does not circulate in the coupling circuit is known.

For example, in JP-A 2013-188098, in an electric vehicle which includes a cooling circuit to cool a battery, a cooling circuit to cool an inverter, a first refrigerant pump provided in the cooling circuit for cooling the battery, a second refrigerant pump provided in the cooling circuit for cooling the inverter, and a switching valve which switches a state between a state (hereinafter also referred to as a circulation state) in which the battery and inverter are temperature-controlled in the same circuit and a state hereinafter also referred to as a non-circulation state) in which the battery and inverter are temperature-controlled in separate circuits, it is described that when the outside air temperature is lower than a predetermined temperature, the circulation state is set, while when the outside air temperature is equal to or higher than the predetermined temperature, the non-circulation state is set to improve the accuracy of temperature adjustment.

SUMMARY

However, since the electric vehicle described in JP-A 2013-188098 switches the state between the circulation state and the non-circulation state according to the outside air temperature, the circulation state and the non-circulation state are switched regardless of the temperature of the power converter. By the way, during charging of the battery, the charger and the battery generate heat regardless of the outside air temperature, so it is necessary to appropriately cool the charger and the battery.

The present invention provides a vehicle capable of appropriately cooling a charger and a battery when charging the battery.

A vehicle including:

a battery,

a power converter,

a charger,

a first temperature adjustment circuit including a first pump for supplying a heat medium to the battery and the charger, a second temperature adjustment circuit including a second pump for supplying the heat medium to the power converter and a heat exchange unit for exchanging heat between the heat medium and the outside air,

a coupling passage which forms a coupling circuit by coupling the first temperature adjustment circuit and the second temperature adjustment circuit,

a switching unit capable of switching a state between a circulation state in which the heat medium can circulate in the coupling circuit and a non-circulation state in which the heat medium cannot circulate in the coupling circuit, and

a control device to select one mode from a plurality of modes.

The plurality of modes includes:a series mode in which the heat medium is circulated in the coupling circuit in the circulation state; anda separate mode in which the heat medium is circulated in at least the second temperature adjustment circuit in the non-circulation state.

The control device executes the series mode when charging the battery.

According to the present invention, by executing the series mode when charging the battery, it is possible to cool the charger and the battery using the heat exchange unit provided in the second temperature adjustment circuit. As a result, it is possible to efficiently cool the charger and the battery when charging the battery.

DESCRIPTION OF EMBODIMENTS

As illustrated inFIG. 1, a vehicle100may be an electric vehicle having only an electric motor as a drive source, a fuel cell vehicle, or a hybrid vehicle having an electric motor and an internal combustion engine. However, in the following description, an electric vehicle will be described as an example. InFIG. 1, a temperature adjustment circuit1and an air conditioner AC, which will be described below, are omitted.

A vehicle body101of the vehicle100is equipped with a battery case103which accommodates a battery2in an underfloor portion of a vehicle compartment102. A motor room104is provided in the front part of the vehicle100. In the motor room104, a motor105, a power converter5, a branch unit106, a charger3and the like are provided.

The rotational driving force of the motor105is transmitted to a shaft107. Front wheels108of the vehicle100are connected to both ends of the shaft107. The power converter5is electrically connected to a connector of the battery case103by a power cable111. Further, the power converter5is electrically connected to the motor105by, for example, a three-phase bus bar. The power converter5drives the motor105with the electric power supplied from the battery2and charges the battery2with the electric power supplied from the motor105.

The charger3is electrically connected to the connector of the battery case103by a cable110via the branch unit106. The charger3is connected to a general external power source such as a household power source to charge the battery2.

The temperature adjustment circuit1illustrated inFIG. 2is mounted on the vehicle100. The temperature adjustment circuit1includes a first temperature adjustment circuit4which includes a first pump DAT1for supplying a heat medium to the battery2and the charger3, a chiller11capable of exchanging heat between the heat medium and a heat medium for air conditioning, and a heater17capable of heating the heat medium, a second temperature adjustment circuit6which includes a second pump EWP2for supplying the heat medium to the power converter5and a radiator12for exchanging heat between the heat medium and the outside air, a first coupling passage8and a second coupling passage9which form a coupling circuit7by coupling the first temperature adjustment circuit4and the second temperature adjustment circuit6, a first electromagnetic switching valve EWV1capable of switching between a circulation state in which the heat medium can circulate in the coupling circuit7and a non-circulation state in which the heat medium cannot circulate in the coupling circuit7, and a control device10which selects any one of the plurality of modes. The heat medium is a liquid medium such as water, a radiator liquid, and a coolant liquid.

The plurality of modes include a series mode (seeFIG. 6) in which, in the circulation state, the heat medium is circulated in the coupling circuit7in a state where the chiller11cannot exchange heat between the heat medium and the heat medium for air conditioning and a separate mode (seeFIGS. 3 to 5) in which the heat medium is circulated in at least the second temperature adjustment circuit6in the non-circulation state. The separate mode includes a separate basic mode (seeFIG. 3) in which, in the non-circulation state, the heat medium is circulated in the second temperature adjustment circuit6, a separate cooling mode (seeFIG. 4) in which, in the non-circulation state, the heat medium is circulated in the second temperature adjustment circuit6and the heat medium is circulated in the first temperature adjustment circuit4so that the chiller11can exchange heat between the heat medium and the heat medium for air conditioning, and a separate heating mode (seeFIG. 5) in which, in the non-circulation state, the heat medium is circulated in the second temperature adjustment circuit6and the heat medium is circulated in the first temperature adjustment circuit4in a state where the heater17is allowed to heat the heat medium. The separate basic mode is not a mode for prohibiting the circulation of the heat medium in the first temperature adjustment circuit4. For example, in the separate mode, the heat medium may be circulated in the first temperature adjustment circuit4without operating the chiller11to eliminate the temperature deviation of the heat medium.

The first temperature adjustment circuit4includes the first pump EWP1for circulating the heat medium in the circuit, the chiller11which is arranged on the downstream side of the first pump EWP1and which can exchange heat between the heat medium and the heat medium for air conditioning, the battery2and the charger3which are arranged on the downstream side of the chiller11, the heater17which is arranged on the downstream side of the charger3and can heat the heat medium, a bypass passage18which bypasses the heater17, a second electromagnetic switching valve EWV2which is arranged at the upstream end of the bypass passage18and switches the state between a state in which the heat medium flows in the heater17and a state in which the heat medium flows in the bypass passage18, and an electromagnetic opening/closing valve FSV which is arranged on the downstream side of the heater17and the second electromagnetic switching valve EWV2and on the upstream side of the first pump EWP1.

As illustrated inFIG. 4, in the separate cooling mode, by opening the electromagnetic opening/closing valve FSV and driving the first pump EWP1with the second electromagnetic switching valve EWV2switched to the bypass passage18side, the heat medium discharged by the first pump EWP1can be circulated in the order of the chiller11(operating state), the battery2, and the charger3. As a result, the heat medium cooled by the operation of the chiller11exchanges heat with the battery2and the charger3and the battery2and the charger3are cooled.

As illustrated inFIG. 5, in the separate heating mode, by opening the electromagnetic opening/closing valve FSV and driving the first pump EWP1with the second electromagnetic switching valve EWV2switched to the heater17side, the heat medium discharged by the first pump EWP1can be circulated in the order of the chiller11(non-operating state), the battery2, the charger3, and the heater17(operating state). As a result, the heat medium heated by the operation of the heater17exchanges heat with the battery2and the charger3, and thus the battery2and the charger3are heated.

Returning toFIG. 2, the air conditioner AC through which the heat medium for air conditioning flows includes a compressor20, a condenser21, an evaporator22, and shutoff valves23and24. The compressor20, the condenser21, and the evaporator22are connected in series and the evaporator22and the chiller11are connected in parallel. In the air conditioner AC, the flow path to the evaporator22and the flow path to the chiller11can be switched by the shutoff valves23and24.

The second temperature adjustment circuit6includes the second pump EWP2for circulating the heat medium in the circuit, the first electromagnetic switching valve EWV1which is arranged on the downstream side of the second pump EWP2to switch the mode, the power converter5which is arranged on the downstream side of the first electromagnetic switching valve EWV1, and the radiator12which is arranged on the downstream side of the power converter5for exchanging heat between the heat medium and the outside air. The power converter5includes at least one of an inverter which converts DC power into AC power and AC power into DC power and a DC-DC converter which steps up or steps down DC voltage.

The first electromagnetic switching valve EWV1of this embodiment is an electromagnetic three-way valve. In the separate mode (including separate basic mode, separate cooling mode, and separate heating mode), the first electromagnetic switching valve EWV1allows connection between a downstream side flow passage of the second pump EWP2and an upstream side flow passage of the power converter5and blocks connection between the downstream side flow passage of the second pump EWP2and the first coupling passage8described below. Then, in the separate mode, as illustrated inFIGS. 3 to 5, by driving the second pump EWP2, the heat medium discharged by the second pump EWP2can be circulated in the order of the power converter5and the radiator12. As a result, the heat medium cooled by the radiator12exchanges heat with the power converter5, and thus the power converter5is cooled.

On the other hand, in the series mode, as illustrated inFIG. 6, the first electromagnetic switching valve EWV1blocks the connection between the downstream side flow passage of the second pump EWP2and the upstream side flow passage of the power converter5and allows the connection between the downstream side flow passage of the second pump EWP2and the first coupling passage8to be described below. The flow of the heat refrigerant in the series mode will be described below.

The coupling passages8and9include the first coupling passage8and the second coupling passage9. The first coupling passage8couples a first connecting portion (first electromagnetic switching valve EWV1) of the second temperature adjustment circuit6and a first connecting portion13of the first temperature adjustment circuit4and the second coupling passage9couples a second connecting portion14of the second temperature adjustment circuit6and a second connecting portion15of the first temperature adjustment circuit4. The second connecting portion14of the second temperature adjustment circuit6is located on the downstream side of the first electromagnetic switching valve EWV1in the second temperature adjustment circuit6and on the upstream side of the power converter5. The first connecting portion13of the first temperature adjustment circuit4is located on the downstream side of the first pump EWP1in the first temperature adjustment circuit4and on the upstream side of the chiller11. The second connecting portion15of the first temperature adjustment circuit4is located on the downstream side of the heater17and the second electromagnetic switching valve EWV2in the first temperature adjustment circuit4and on the upstream side of the electromagnetic opening/closing valve FSV.

The passage between the first connecting portion13and the second connecting portion15in the first temperature adjustment circuit4, that is, the passage in which the first pump EWP1and the electromagnetic opening/closing valve FSV are arranged in the first temperature adjustment circuit4functions as a branch passage16which bypasses a part of the coupling circuit7.

As illustrated inFIG. 6, in the series mode in which the heat medium circulates in the coupling circuit7, the operations of the first pump EWP1, the chiller11, and the heater17are stopped and the heat medium is circulated by driving the second pump EWP2. As a result, the heat medium discharged from the second pump EWP2circulates in the order of the battery2, the charger3, the power converter5, and the radiator12, and thus the battery2, the charger3, and the power converter5are cooled. In the series mode, the electromagnetic opening/closing valve FSV is closed to stop the circulation of the heat medium via the branch passage16.

A control device10receives temperature information from a battery temperature sensor Sb for obtaining a battery temperature Tb, which is the temperature of the battery2(cell), a battery medium temperature sensor Swb for obtaining a battery medium temperature Twb, which is the temperature of the heat medium at the inlet of the battery2, a power converter medium temperature sensor Swp for obtaining a power converter medium temperature Twp, which is the temperature of the heat medium at the inlet of the power converter5, and a charger medium temperature sensor Swc for obtaining a charger medium temperature Twc, which is the temperature of the heat medium at the inlet of the charger3and one of the modes is selected according to the battery temperature Tb, the battery medium temperature Twb, the power converter medium temperature Twp, the charger medium temperature Twc, and the vehicle state (battery charging, travelling, or the like).

<Mode Switching Process when Battery Charging>

The control device10executes the series mode when charging the battery2. According to such a mode switching process at the time of charging the battery, the battery2and the charger3can be cooled by using the radiator12provided in the second temperature adjustment circuit6. Therefore, it is possible to efficiently cool the battery2and the charger3when charging the battery2without using the chiller11which consumes a large amount of power. In addition, the amount of heat generated during battery charging is larger in the battery2than in the power converter5and larger in the charger3than in the battery2.

Further, the control device10executes the separate mode at the start of charging the battery2, and then executes the series mode. According to such a mode switching process at the time of battery charging, it is possible to prepare for the transition to the series mode by executing the separate mode according to the situation of the power converter5and the battery2at the start of battery charging. For example, when the temperature of the power converter5is extremely high at the start of battery charging, it is possible to execute separate basic mode to lower the temperature of the power converter5and then shift to the series mode. When the temperature of the battery2is extremely low at the start of battery charging, it is possible to increase the temperature of the battery2by executing separate heating mode and then shift to the series mode.

Next, a specific processing procedure of the mode switching process at the time of battery charging will be described with reference toFIGS. 7 and 8.

As illustrated inFIG. 7, the control device10determines (S103) whether the power converter medium temperature Twp is equal to or less than a first predetermined value TH1after (S102) starting the separate basic mode in response to (S101) the charging start of the battery2. When the determination result of Step S103is NO, the control device10continues (S104) the separate basic mode until a predetermined time has elapsed (S105), and then performs the determination process of Step S103again. That is, when the temperature of the power converter5is high, in a state where, by continuing the separate basic mode, the flow rate of the heat medium for cooling the power converter5is secured, by exchanging heat between only the second temperature adjustment circuit6and the outside air using the radiator12, the power converter5can be cooled early.

When the determination result of Step S103is YES, the control device10determines whether the battery temperature Tb is higher than a second predetermined value TH2(TH2<TH1) (S106), and when the result of this determination is NO, the separate heating mode is executed (S107) until the predetermined time has elapsed (S108), and then the determination processing of Step S106is performed again. That is, when the temperature of the battery2is low, the battery2can be heated early by executing the separate heating mode.

When the determination result of Step S106is YES, the control device10determines whether the power converter medium temperature Twp is higher than the battery medium temperature Twb (S109), and when the determination result is NO, the mode is switched to the series mode (S113). That is, when the temperature of the battery2is higher than the temperature of the power converter5, by shifting the mode to the series mode, it is possible to positively cool the battery2and the charger3which generate a large amount of heat when charging the battery.

When the determination result of Step S109is YES, the control device10determines whether the temperature difference between the power converter medium temperature Twp and the battery medium temperature Twb is a third predetermined value TH3or less (S110), and when the determination result is NO, the separate basic mode is continued (S111) until the predetermined time has elapsed (S112), and then the determination process of Step S110is performed again. That is, when the temperature of the power converter5is higher than the temperature of the battery2and the temperature difference is large, by continuing the separate mode, it is possible to prevent the temperature of the battery2from rising sharply.

When the determination result of Step S110is YES, the control device10switches the mode to the series mode (S113). That is, when the temperature of the power converter5is higher than the temperature of the battery2but the temperature difference is small, by changing the mode to the series mode, it is possible to cool the battery2and the charger3by using the radiator12provided in the second temperature adjustment circuit6while suppressing the influence on the battery2.

The control device10controls the output of the charger3based on the battery medium temperature Twb and the charger medium temperature Twc, as illustrated in a control map ofFIG. 8, and performs the mode switching process from the switching to the series mode (S113) to the completion of charging (S114).

Specifically, the control device10limits the output of the charger3when either the battery medium temperature Twb is higher than a fourth predetermined value TH4or the charger medium temperature Twc is higher than a fifth predetermined value TH5. That is, when the temperature of the battery2and/or the temperature of the charger3is abnormally high, damage to the battery2and/or the charger3can be avoided by controlling the output of the charger3.

Also, when the battery medium temperature Twb is a sixth predetermined value TH6(TH6<TH4) or less and the charger medium temperature is a seventh predetermined value TH7(TH7<TH5) or less, the control device10changes the mode from the series mode to the separate heating mode. That is, when the temperature of the battery2and the temperature of the charger3are abnormally low, the battery2can be heated early by changing the mode from the series mode to the separate heating mode. Under normal temperature environment, after shifting the mode to the series mode, the series mode is maintained until charging of the battery2is completed.

Returning toFIG. 7, after the battery2is completely charged (S114), the control device10determines whether the battery medium temperature Twb is equal to or lower than an eighth predetermined value TH8(S115), and when the result of this determination is YES, the mode shifts to the normal mode (S120) and the cooling of the battery2and the charger3is stopped. The normal mode has a low relevance to the present invention, so a detailed description thereof will be omitted. However, briefly, in the normal mode, the control device10determines from the temperature information of the battery2whether the battery request is a heating request, a heat retention request, a cooling request, or a strong cooling request and selects any one of the separate heating mode, the separate basic mode, the series mode, and the separate cooling mode.

On the other hand, when the determination result of Step S115is NO, that is, when the battery medium temperature Twb is higher than the eight predetermined value TH8, the control device10changes the output of the radiator12(cooling fan) and the output of the second pump EWP2according to the battery medium temperature Twb while continuing to cool the battery2and the charger3in the series mode. That is, when the temperature of the battery2is high after charging of the battery2is completed, there is a possibility that it could be a hindrance to normal driving. Therefore, it is possible to cool the battery2early by changing the output of the radiator12and the output of the second pump EWP2according to the battery medium temperature Twb while continuing to cool the battery2and the charger3in the series mode.

More specifically, when the determination result of Step S115is NO, the control device50determines whether the battery medium temperature Twb is equal to or less than a ninth predetermined value TH9(TH9>TH8) (S116), and when the determination result is YES, the output of the radiator12and the output of the second pump EWP2are set to a middle level (MID) (S117), and when the determination result is NO, cooling of the battery2and the charger3in series mode is continued until the battery medium temperature Twb becomes equal to or less than the eight predetermined value TH8(S119) while the output of the radiator12and the output of the second pump EWP2are set to a high level (HI) (S118).

Modification Example

Next, a modification example of the mode switching processing procedure at the time of battery charging will be described with reference toFIG. 9. However, regarding the same processing procedure as that of the embodiment described above, the same reference letters and numerals as those of the embodiment described above are used and the description of the embodiment described above is cited.

The modification example illustrated inFIG. 9is different from the embodiment described above in that the control device receives a charge start sign signal before charging the battery2, executes the separate mode before starting the charging of the battery2, and then executes the series mode. According to such a modification example, by receiving the charge start sign signal before charging the battery2and executing the separate mode before starting the charging of the battery2, and then executing the series mode, preparations for charging the battery2can be made in advance.

Examples of the charge start sign signal include a charging timer setting signal from a smartphone application, a charging lid open signal from a smart key, and an operation signal of a charging lid open button provided on a vehicle. Also, as illustrated inFIG. 9, when the control device receives the charge start sign signal (S201), it starts the separate basic mode (S102), and then executes the same processing procedure as that of the above-described embodiment until Step S112, and when the battery2is started to be charged (S202), the mode is switched to the series mode (S113). After switching the mode to the series mode in S113, the same processing procedure as in the embodiment described above is executed.

Although the embodiments of the present invention are described above, the present invention is not limited to the embodiments described above and various modifications and improvements can be made as appropriate.

For example, in the embodiments described above, as the first temperature, the battery temperature Tb, which is the temperature of the battery2(cell), and the battery medium temperature Twb, which is the temperature of the heat medium at the inlet of the battery2, are exemplified, but it may be the temperature of the cooling portion of the battery2. Further, in the embodiment described above, although the power converter medium temperature Twp, which is the temperature of the heat medium at the inlet of the power converter5, is exemplified as the second temperature, the temperature of the power converter5itself or the temperature of the cooling portion of the power converter5may be used. Further, in the embodiment described above, although the charger medium temperature Twc, which is the temperature of the heat medium at the inlet of the charger3, is exemplified as the third temperature, it may be the temperature of the charger3itself or the temperature of the cooling portion of the charger3.

At least the following matters are described in the present specification. Although the constituent elements and the like corresponding to the embodiment described above are shown in parentheses, the present invention is not limited to this.

(1) A vehicle (vehicle100) which includes a battery (battery2), a power converter (power converter5), a charger (charger3), a first temperature adjustment circuit (first temperature adjustment circuit4) including a first pump (first pump EWP1) for supplying a heart medium to the battery and the charger, a second temperature adjustment circuit (second temperature adjustment circuit6) including a second pump (second pump EWP2) for supplying the heat medium to the power converter and a heat exchange unit (radiator12) for exchanging heat between the heat medium and the outside air, a coupling passage (first coupling passage8, second coupling passage9) which forms a coupling circuit (coupling circuit7) by coupling the first temperature adjustment circuit and the second temperature adjustment circuit, a switching unit (first electromagnetic switching valve EWV1) capable of switching a state between a circulation state in which the heat medium can circulate in the coupling circuit and a non-circulation state in which the heat medium cannot circulate in the coupling circuit, and a control device (control device10) to select one mode from a plurality of modes, where

the plurality of modes includes,

a series mode in which the heat medium is circulated in the coupling circuit in the circulation state, and

a separate mode in which the heat medium is circulated in at least the second temperature adjustment circuit in the non-circulation state, and

the control device executes the series mode when charging the battery.

According to (1), by executing the series mode when charging the battery, the heat exchange unit provided in the second temperature adjustment circuit can be used to cool the charger and the battery. As a result, it is possible to efficiently cool the charger and the battery when charging the battery.

(2) The vehicle according to (1), where the control device starts charging the battery, and after executing the separate mode, executes the series mode.

According to (2), by executing the separate mode before executing the series mode, it is possible to grasp the status of the power converter and the battery and prepare for the transition to the series mode.

(3) The vehicle according to (1), where the control device receives a charge start sign signal before charging the battery, executes the separate mode before starting the charge of the battery, and then executes the series mode.

According to (3), it is possible to prepare for charging the battery in advance by receiving the charge start sign signal before charging the battery, executing the separate mode before starting the charge of the battery, and then executing the series mode.

(4) The vehicle according to (2) or (3), where

the vehicle further includes,

a first temperature acquisition unit (battery temperature sensor Sb, battery medium temperature sensor Swb) which acquires a first temperature (battery temperature Tb, battery medium temperature Twb) which is a temperature of the battery, and

a second temperature acquisition unit (power converter medium temperature sensor Swp) which acquires a second temperature (power converter medium temperature Twp) which is a temperature of the power converter, and

the control device executes the separate mode, and then controls change from the separate mode to the series mode based on the first temperature and the second temperature.

According to (4), by controlling the change from the separate mode to the series mode based on the temperature of the battery and the temperature of the power converter, the temperature of the battery and the power converter can be appropriately managed.

(5) The vehicle according to (4), where

the control device executes the separate mode, and then continues the separate mode when the second temperature is higher than a first predetermined value (first predetermined value TH1).

According to (5), by continuing the separate mode when the temperature of the power converter is high, the flow rate of the heat medium for cooling the power converter can be secured, and thus the power converter can be cooled early.

(6) The vehicle according to (4) or (5), where

the vehicle further includes a heating unit (heater17) in the first temperature adjustment circuit, and

after executing the separate mode, the control device continues the separate mode in a state where the first pump and the heating unit are operated when the first temperature is equal to or lower than a second predetermined value (second predetermined value TH2).

According to (6), when the temperature of the battery is low, the battery can be heated early by continuing the separate mode in a state where the first pump and heating unit are operated.

(7) The vehicle according to any one of (4) to (6), where after executing the separate mode, the control device changes the mode from the separate mode to the series mode when the second temperature is equal to or lower than the first temperature.

According to (7), when the temperature of the battery is higher than the temperature of the power converter, by shifting the mode to the series mode, it is possible to positively cool the battery having a large heat generation amount during charging.

(8) The vehicle according to any one of (4) to (7), where

after executing the separate mode, the control device continues the separate mode when the second temperature is higher than the first temperature and a temperature difference between the second temperature and the first temperature is higher than a third predetermined value (third predetermined value TH3).

According to (8), when the temperature of the power converter is higher than the temperature of the battery and the temperature difference is large, by continuing the separate mode, it is possible to prevent the temperature of the battery from rising sharply.

(9) The vehicle according to any one of (4) to (8), where

after executing the separate mode, the control device changes the mode from the separate mode to the series mode when the second temperature is higher than the first temperature and the temperature difference between the second temperature and the first temperature is equal to or less than the third predetermined value (third predetermined value TH3).

According to (9), when the temperature of the power converter is higher than the temperature of the battery, but the temperature difference is small, by changing the mode to the series mode, it is possible to cool the battery by using the heat exchange unit provided in the second temperature adjustment circuit while suppressing the influence on the battery.

(10) The vehicle according to any one of (4) to (9), where

the vehicle further includes a third temperature acquisition unit (charger medium temperature sensor Swc) which acquires a third temperature (charger medium temperature Twc) which is a temperature of the charger, and

the control device controls an output of the charger based on the first temperature and the third temperature in the series mode.

According to (10), during the series mode, the control can be facilitated by controlling the output of the charger based on the temperatures of the battery and the charger which generate a large amount of heat during charging.

(11) The vehicle according to (10), where

the control device limits the output of the charger when either of the first temperature is higher than a fourth predetermined value (fourth predetermined value TH4) and the third temperature is higher than a fifth predetermined value (fifth predetermined value TH5).

According to (11), when the temperature of the battery and/or the temperature of the charger is abnormally high, damage to the battery and/or the charger can be avoided by controlling the output of the charger.

(12) The vehicle according to any one of (4) to (9), where

the vehicle further includes a third temperature acquisition unit (charger medium temperature sensor Swc) which acquires a third temperature (charger medium temperature Twc) which is a temperature of the charger, and

the control device controls a change from the series mode to the separate mode based on the first temperature and the third temperature in the series mode.

According to (12), during the series mode, the control can be facilitated by controlling the change from the series mode to the separate mode based on the temperatures of the battery and the charger which generate a large amount of heat during charging.

(13) The vehicle according to (12), where

the vehicle further includes a heating unit (heater17) in the first temperature adjustment circuit, and

the control device changes the mode from the series mode to the separate mode when the first temperature is equal to or less than a sixth predetermined value (sixth predetermined value TH6) and when the third temperature is equal to or less than a seventh predetermined value (seventh predetermined value TH7) and operates the first pump and the heating unit.

According to (13), when the temperature of the battery and the temperature of the charger are low, the battery can be heated early by changing the mode from the series mode to the separate mode and operating the first pump and heating unit.

(14) The vehicle according to any one of (4) to (11), where

the control device changes an output of the heat exchange unit and an output of the second pump according to the first temperature when the first temperature is higher than an eight predetermined value (eighth predetermined value TH8) after charging of the battery is completed.

According to (14), after charging of the battery is completed, when the temperature of the battery is high, the output of the heat exchange unit and the output of the second pump can be changed according to the temperature of the battery to cool the battery early.