JP7237682B2 - vehicle power supply - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle power supply, and more particularly to a vehicle power supply capable of suppressing heat generation during charging.

Hybrid vehicles and electric vehicles have appeared as vehicles such as passenger cars, and these vehicles are equipped with large-sized batteries. Furthermore, in recent years, in order to extend the continuous running distance, the size of the battery mounted on the vehicle is increasing. In addition, as the size of the battery increases, the output of the charger for charging the battery is increased from about 50 kW in the past to about 150 kW, for example.

In addition, Patent Documents 1 and 2 below disclose inventions that change the connection configuration of the battery between charging and discharging in order to charge the battery efficiently.

JP-A-7-131906 JP-A-8-340641

However, in the above-described large-capacity battery, the temperature of the battery tends to rise after repeated charging and discharging. Therefore, when a lithium-ion battery is used as an on-board battery, the maximum allowable temperature of the lithium-ion battery is about 60°C. As a result, there was a problem that it took a long time to charge the battery. In addition, when the vehicle travels long distances, there is a problem that the battery must be charged frequently.

Furthermore, when the battery is charged with an increased output, electric wires, bus bars, relays, etc. intervening in the power supply path generate heat in proportion to the square of the flowing current. Therefore, there is no choice but to charge while suppressing the output value, and there is a problem that charging takes a long time. Especially in summer, the temperature of the battery itself becomes high, so the above-described problem caused by the heat generation becomes noticeable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle power supply device capable of suppressing output reduction due to battery heat generation and voltage drop during charging. That's what it is.

A power source device for a vehicle according to the present invention is a power supply connection that connects a battery composed of a plurality of battery modules in which a plurality of battery cells are connected, an external power source that is a power source existing outside the vehicle or a load mounted on the vehicle, and the battery. and the battery module is interposed in the power supply connection line and is discharged during discharge when the battery is connected to the on-vehicle load and during charging when the battery is connected to the external power supply and charged. and a control unit that changes the connection configuration of the battery module, wherein the control unit changes the connection configuration of the battery module when charging of the battery starts, and the control unit changes the connection configuration of the battery module during charging. A cooling circulation device for cooling the battery is operated.

Further, in the vehicle power supply device of the present invention, a battery composed of a plurality of battery modules in which a plurality of battery cells are connected, an external power supply or vehicle-mounted load that is a power supply existing outside the vehicle, and the battery are connected. a power supply connection line; and a discharging operation in which the battery connected to the vehicle-mounted load connected to the power supply connection line is discharged, and a charging operation in which the battery is connected to the external power supply and charged. a control unit that changes the connection form of the battery module, wherein the control unit changes the connection form of the battery module when charging of the battery starts, and the control unit changes the connection form of the battery. is started, the battery is cooled using the cooling device of the vehicle.

Further, in the vehicle power supply device of the present invention, the control unit cools an electronic device including a switching device and a switch during the charging.

Further, in the vehicle power supply device of the present invention, the control unit supplies surplus electric power to the cooling circulation device during the charging.

Further, in the vehicle power supply device of the present invention, the control unit cools the electronic device including the switching device and the switch when charging of the battery is started.

Further, in the vehicle power supply device of the present invention, the surplus electric power generated when the battery is charged is used to operate the compressor of the cooling device of the vehicle.

Further, in the vehicle power supply device of the present invention, the battery has a first battery module group consisting of a plurality of the battery modules and a second battery module group consisting of a plurality of the battery modules, and the control unit connects the first battery module group and the second battery module group in series during the discharging, and connects the first battery module group and the second battery module group during the charging. are connected in parallel.

Further, in the vehicle power supply device of the present invention, the control unit changes the connection form of the battery module when the external power supply is connected to the vehicle.

Further, in the vehicle power supply device of the present invention, the control unit connects the battery modules in series during the discharging, and connects the battery modules in parallel during the charging. and

A power source device for a vehicle according to the present invention is a power supply connection that connects a battery composed of a plurality of battery modules in which a plurality of battery cells are connected, an external power source that is a power source existing outside the vehicle or a load mounted on the vehicle, and the battery. and the battery module is interposed in the power supply connection line and is discharged during discharge when the battery is connected to the on-vehicle load and during charging when the battery is connected to the external power supply and charged. and a control unit that changes the connection configuration of the battery module, wherein the control unit changes the connection configuration of the battery module when charging of the battery starts, and the control unit changes the connection configuration of the battery module during charging. A cooling circulation device for cooling the battery is operated. Thus, according to the vehicle power supply device of the present invention, it is possible to effectively cool the electronic device including the switching device and the switch together with the battery.

Further, the vehicle power supply device of the present invention connects a battery composed of a plurality of battery modules in which a plurality of battery cells are connected, an external power supply or a vehicle-mounted load that is a power supply existing outside the vehicle, and the battery. a power supply connection line; and a discharging operation in which the battery connected to the vehicle-mounted load connected to the power supply connection line is discharged, and a charging operation in which the battery is connected to the external power supply and charged. a control unit that changes the connection form of the battery module, wherein the control unit changes the connection form of the battery module when charging of the battery starts, and the control unit changes the connection form of the battery. is started, the battery is cooled using the cooling device of the vehicle. As a result, according to the vehicle power supply device of the present invention, the battery can be effectively cooled by the vehicle interior air conditioner, which is composed of, for example, a vapor compression refrigeration cycle.

Further, in the vehicle power supply device of the present invention, the control unit cools an electronic device including a switching device and a switch during the charging. Thus, according to the vehicle power supply device of the present invention, the battery including electronic devices such as the switching device and the switch is cooled at a high temperature, so that the battery can be cooled at a high temperature at the time of charging, and charging can be performed effectively. can be done.

Further, in the vehicle power supply device of the present invention, the control unit supplies surplus electric power to the cooling circulation device during the charging. Thus, according to the vehicle power supply device of the present invention, by supplying the battery cooling device with surplus power during charging, it is possible to eliminate the need for a dedicated power source for the surplus power, and further reduce the power required for cooling the battery. can.

Further, in the vehicle power supply device of the present invention, the control unit cools the electronic device including the switching device and the switch when charging of the battery is started. As a result, according to the vehicle power source apparatus of the present invention, the battery can be effectively cooled by the vehicle interior air conditioner, which is composed of, for example, a vapor compression refrigeration cycle.

Further, in the vehicle power supply device of the present invention, the surplus electric power generated when the battery is charged is used to operate the compressor of the cooling device of the vehicle. Thus, according to the vehicle power supply device of the present invention, by operating the compressor of the cooling device of the vehicle with the surplus electric power, the energy required for operating the vehicle interior air conditioner can be reduced.

Further, in the vehicle power supply device of the present invention, the battery has a first battery module group consisting of a plurality of the battery modules and a second battery module group consisting of a plurality of the battery modules, and the control unit connects the first battery module group and the second battery module group in series during the discharging, and connects the first battery module group and the second battery module group during the charging. are connected in parallel. Thus, according to the vehicle power supply device of the present invention, it is possible to supply high-voltage power to the vehicle-mounted load during discharging. In addition, it is possible to suppress the heat generation of the battery during charging and to effectively charge the battery.

Further, in the vehicle power supply device of the present invention, the control unit changes the connection form of the battery module when the external power supply is connected to the vehicle. Thus, according to the vehicle power supply device of the present invention, it is possible to optimize the connection form of the battery modules, triggered by the connection by the connection means such as the connection plug.

Further, in the vehicle power supply device of the present invention, the control unit connects the battery modules in series during the discharging, and connects the battery modules in parallel during the charging. and Thus, according to the vehicle power supply device of the present invention, by connecting the battery modules in series during discharging, high-voltage power can be supplied to the vehicle-mounted load. Also, during charging, by connecting the battery modules in parallel, heat generation of the battery modules during charging can be suppressed, and the battery modules can be effectively charged.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a vehicle power supply device according to an embodiment of the present invention, where (A) is a perspective view showing a vehicle provided with the vehicle power supply device, and (B) is a block diagram showing the vehicle power supply device; be. 1 is a circuit diagram showing a vehicle power supply device according to an embodiment of the present invention; FIG. 1 is a plan view showing a vehicle equipped with a vehicle power supply device according to an embodiment of the present invention; FIG. FIG. 2 is a circuit diagram showing the operation of the vehicle power supply device according to the embodiment of the present invention during discharging (during running); FIG. 2 is a circuit diagram showing the operation during charging of the vehicle power source device according to the embodiment of the present invention;

DETAILED DESCRIPTION OF THE INVENTION A vehicle power supply device 10 according to an embodiment of the present invention will be described in detail below with reference to the drawings. In the following description, in principle, the same reference numerals are used for the same members, and repeated descriptions are omitted.

FIG. 1A is a perspective view illustrating a vehicle 20 equipped with a vehicle power supply device 10. FIG. FIG. 1B is a block diagram showing the connection configuration of the vehicle 20. As shown in FIG.

As shown in FIG. 1A, a vehicle 20 such as an automobile or a train is equipped with a vehicle power supply device 10 for supplying electric power to a motor and various electrical components. As the vehicle 20, an EV (Electric Vehicle), an HEV (Hybrid Electric Vehicle), a PHEV (Plug-in Hybrid Electric Vehicle), or the like can be employed. These vehicles 20 are also equipped with the vehicle power supply device 10 having a high power storage function.

The vehicle 20 includes a vehicle body 22, a vehicle power supply 10 arranged in a battery arrangement area 21 defined in the vicinity of a bottom surface 23 of the vehicle 20, and a motor driven by electric power supplied from the vehicle power supply 10. 14 and a tire (not shown) that rotates with the driving force of the motor. Here, the battery placement area 21 can be placed in an area other than the bottom surface 23, and for example, the battery placement area 21 can be set behind the rear seats.

As shown in FIG. 1B, the vehicle power supply device 10 of this embodiment has a battery 11 and a control unit 16 . The battery 11 is, for example, a lithium-ion battery or a nickel-metal hydride battery, and is composed of a plurality of plate-shaped battery modules 12 (see FIG. 2, etc.). Here, the battery module is an invention specifying requirement consisting of one or two or more battery cells.

The control unit 16 includes a CPU and the like for controlling the behavior of each part such as each switch and inverter included in the vehicle power supply device 10 . AC power generated by an inverter, which will be described later, rotates the motor 14 according to an instruction from the control unit 16 , thereby rotating the tires of the vehicle 20 . Also, as will be described later, the control unit 16 sets the connection form of the battery modules 12 constituting the battery 11 in series or in parallel depending on whether the battery 11 is discharged or charged.

Battery 11 is connected to external power supply 13 via control unit 16 and external connection section 24 . The external power supply 13 is an AC power supply or a DC power supply.

The external power supply 13 and the control unit 16 are connected via an external connection section 24 . When the user inserts a connection plug or the like into the external connection portion 24 of the vehicle 20 , electric power is supplied from the external power source 13 to the battery 11 via the control unit 16 . Here, as a form of connecting the external power source 13 and the vehicle 20, it is possible to adopt a method other than a plug-in connection plug. A contactless power transmission mechanism that supplies power can also be employed.

The circuit configuration of the vehicle power supply device 10 will be described with reference to the circuit diagram of FIG. The vehicle power supply device 10 mainly includes a battery 11, a switching device 30, a junction box 42 (switching device), and each switch that performs on/off control in each line.

The battery 11 has a battery module group 40 and a battery module group 41 . The battery module group 40 is composed of a plurality of twelve battery modules 12 connected in series. The battery module group 41 is composed of a plurality of battery modules 12 connected in series. The battery module group 40 and the battery module group 41 are connected in parallel or in series by being connected via the switching device 30 . As will be described later, the battery module group 40 and the battery module group 41 are connected in series during discharging and in parallel during charging. Here, the battery module group 40 and the battery module group 41 correspond to the first battery module group and the second battery module group.

The switching device 30 has a control unit 16 , a switch 35 , a switch 36 and a switch 37 . The control unit 16 is composed of a CPU and the like, and controls the on/off operation of each switch. Switch 35, switch 36 and switch 37 are interposed in the line through which power is supplied from battery 11 to each inverter. Here, as the switch 35, a semiconductor switch such as a bipolar transistor or a field effect transistor, a mechanical switch such as a relay, or the like can be used, and the same applies to other switches.

Junction box 42 is arranged at a connection point between battery 11 and the outside, and houses switch 31, switch 32, switch 33, and switch .

Each line through which power supplied from the battery 11 passes will be described. A positive electrode of the battery 11 and the rear inverter 19 are connected via a connection line 51 . A switch 31 is interposed in the connection line 51 . A negative electrode of the battery 11 is connected to the rear inverter 19 via a connection line 52 . A switch 34 is interposed in the connection line 52 .

A connection line 61 connects a connection point 80 of the connection line 51 and one end of the external connection portion 24 . A switch 32 is interposed in the connection line 61 . A connection line 62 connects the connection point 83 of the connection line 52 and the external connection portion 24 . A switch 33 is interposed in the connection line 62 .

The positive electrode of battery 11 and front inverter 18 are connected via connection line 51 , switch 31 , connection point 80 , connection point 84 and connection line 54 . The negative electrode of the battery 11 and the front inverter 18 are connected via a connection line 52 , a switch 34 , a connection point 83 , a connection point 85 and a connection line 55 .

A connection line 69 connects the negative electrode of the battery module group 40 and the connection point 85 . A switch 35 is interposed in the connection line 69 . A connection line 53 connects a connection point 91 of the connection line 69 and a positive electrode of the battery module group 41 . A switch 36 is interposed in the connection line 53 . The connection point 90 of the connection line 53 and the connection point 84 of the connection line 54 are connected by the connection line 60 . A switch 37 is interposed in the connection line 60 .

The rear inverter 19 is connected to the rear motor 142 via a connection line 65 , and the front inverter 18 is connected to the front motor 141 via a connection line 67 .

One end electrode of V2X25 is connected to connection point 81 of connection line 61 via connection line 63, and the other end electrode of V2X25 is connected to connection point 82 of connection line 62 via connection line 64. . Here, V2X is to use the electric power of the battery 11 mounted on the vehicle 20 outside the vehicle for purposes other than running the vehicle.

The external connection section 24 is connected to the external power supply 13 via a connection line 66 .

One end electrode of the air conditioner 27 is connected to the connection point 86 of the connection line 54 via the connection line 56 , and the other end electrode of the air conditioner 27 is connected to the connection line 55 via the connection line 57 . It is connected with the connection point 88 .

One end side electrode of the converter 26 is connected to the connection point 87 of the connection line 54 via the connection line 58, and the other end side electrode of the converter 26 is connected to the connection point of the connection line 55 via the connection line 59. 89 is connected. Here, the converter refers to a device that converts and supplies high-voltage battery voltage of 300V or more to vehicle electrical components driven by a voltage of 12V or 48V, for example.

The vehicle 20 also has a cooling circulation device 28 that cools and circulates a cooling fluid that cools the switches and the battery 11 of the vehicle power supply device 10 . A cooling fluid such as cooling water cooled by the cooling circulation device 28 flows through a cooling pipe 43 arranged near the battery 11 . The battery 11 and the like are cooled by heat exchange between the battery 11 and the like and the cooling fluid. The control unit 16 controls the opening/closing operation of the valve 29 interposed in the cooling pipe 43 . As the cooling circulation device 28, a vehicle air conditioner that cools and heats the passenger compartment or a cooling device that only cools the battery 11 can be used. Further, while the vehicle 20 is running, the cooling fluid flowing through the cooling pipe 43 can cool the front motor 141, the rear motor 142, the front inverter 18, the rear inverter 19, and the like. Furthermore, a part of the cooling pipe 43 is arranged so as to cool each electronic device such as the switch 31 built in the junction box 42 .

A load 44 is interposed in the connection line 60 and a load 45 is interposed in the connection line 69 . The loads 44 and 45 are, for example, variable resistors, cooling pumps, and the like. Load 44 and load 45 consume excess power generated during charging.

In the circuit diagram shown in FIG. 2, the power supply connection line is a line that connects a load mounted on the vehicle or an external power supply 13 and the battery 11 . For example, the power supply connection line is a line that connects the battery 11 and the front inverter 18 or the rear inverter 19. Specifically, the connection line 51, the connection line 52, the connection line 54, the connection line 55, and the like correspond. .

FIG. 3 is a plan view showing a structure in which vehicle power supply device 10 is arranged in vehicle 20. As shown in FIG. Referring to FIG. 3 , switching device 30 is adjacent to battery module group 40 and battery module group 41 forming battery 11 . Switching device 30 and battery module group 40 and battery module group 41 are connected via bus bar 39 . The bus bar 39 is connected to each switch shown in FIG. 2, and when the battery 11 is discharged during running, the battery module group 40 and the battery module group 41 are connected in series, so that a high voltage current flows. . On the other hand, when the battery 11 is charged, the battery module group 40 and the battery module group 41 are connected in parallel, thereby suppressing output reduction and power loss due to voltage drop caused by wiring resistance in the bus bar 39. be done.

Furthermore, a cooling pipe 43 is arranged on or near the upper surface of the battery 11 . Here, the cooling pipes 43 are routed on the upper surface of the battery module group 40 , but the cooling pipes 43 can also be routed on the upper surface of the battery module group 41 . A part of the cooling pipe 43 is also arranged on the main surface of the switching device 30 and its vicinity. Furthermore, the cooling pipe 43 may be arranged near other components, such as the front inverter 18 and the rear inverter 19, which are not shown here.

The operation of vehicle power supply device 10 having the above configuration will be described with reference to FIGS. 4 and 5. FIG. FIG. 4 shows the configuration of the vehicle power supply device 10 when the vehicle 20 runs by discharging the battery 11 . FIG. 5 shows the operation of the vehicle power supply device 10 when charging the battery 11 . In FIGS. 4 and 5, the direction of current flow is indicated by a dashed line.

FIG. 4 is a circuit diagram showing the state of vehicle power supply 10 in a discharging state. Here, the control unit 16 connects the switch 31, disconnects the switch 32, disconnects the switch 33, connects the switch 34, disconnects the switch 35, and connects the switch 36. The switch 37 is turned off.

By setting each switch of the vehicle power supply device 10 to the state described above, high-voltage power is supplied from the series-connected battery 11 to the front inverter 18 and the rear inverter 19 .

Specifically, inside the battery 11, the battery module group 40 and the battery module group 41 are connected in series. That is, the battery module group 41 and the battery module group 40 are connected through the path of the connection line 53, the switch 36, the connection line 53, the connection point 91, and the connection line 69, and current flows through this path.

The path through which power from the battery 11 is supplied to the front inverter 18 includes the battery 11, the connection line 51, the switch 31, the connection point 80, the connection point 84, the connection line 54, the front inverter 18, the connection line 55, the connection point 85, A connection point 83 , a switch 34 , a connection line 52 and a battery 11 . The AC power converted to a predetermined frequency by the front inverter 18 is supplied to the front motor 141 to rotate the front wheels of the vehicle power supply device 10 .

A path through which power from the battery 11 is supplied to the rear inverter 19 is the battery 11 , the connection line 51 , the rear inverter 19 , the connection line 52 and the battery 11 . The AC power converted to a predetermined frequency by the rear inverter 19 is supplied to the rear motor 142 to rotate the rear wheels of the vehicle power supply device 10 .

Electric power may also be supplied to the air conditioner 27 and the converter 26 when the vehicle is running. The path through which power is supplied to air conditioner 27 and converter 26 branches from connection line 54 and connection line 55 . The path through which power is supplied to the air conditioner 27 is the connection point 86 , the connection line 56 , the air conditioner 27 , the connection line 57 and the connection point 88 . The path through which power is supplied to converter 26 is juncture 87 , juncture line 58 , converter 26 , juncture line 59 , juncture 89 .

When the vehicle is running, the control unit 16 may close the valve 29 so that the cooling fluid does not flow inside the cooling pipe 43 . When the vehicle 20 is running, the battery 11 is discharged, and the amount of heat generated from the battery 11 is small compared to when it is being charged.

The operation of vehicle power supply device 10 when charging battery 11 will be described with reference to FIG.

FIG. 5 is a circuit diagram showing the state of the vehicle power supply device 10 in the charging state. Here, the control unit 16 brings the switch 31 into the connected state, the switch 32 into the connected state, the switch 33 into the connected state, the switch 34 into the connected state, the switch 35 into the connected state, the switch 36 into the disconnected state, The switch 37 is in the connected state.

Also, the external connection section 24 is connected via a connection line 66 to the external power supply 13, which is an AC power supply or a DC power supply. As a form of connecting the external connection portion 24 and the external power source 13, a physical connection in which a connection plug connected to the external power source 13 is connected to an inlet of the vehicle 20 may be used. Contact charging is fine.

The control unit 16 detects the connection between the external connection portion 24 and the external power supply 13, controls the disconnection state of each switch as described above, and uses the electric power supplied from the external power supply 13 to the vehicle 20 to operate the battery. Charging is performed while the module group 40 and the battery module group 41 are connected in parallel. Also, as will be described below, when each battery module 12 constituting the battery 11 is sufficiently charged, the control unit 16 terminates charging.

In this embodiment, when the battery 11 is charged, the battery module group 40 and the battery module group 41 forming the battery 11 are connected in parallel.

The path through which the battery module group 40 is connected to the external connection section 24 includes the battery module group 40, connection line 69 (switch 35), connection point 83, connection line 62 (switch 33), external connection section 24, connection line 61 ( switch 32 ), switch 31 , connection line 51 , and battery module group 40 .

The path through which the battery module group 41 is connected to the external connection section 24 includes the battery module group 41, connection line 52, switch 34, connection line 62 (switch 33), external connection section 24, connection line 61 (switch 32), connection A point 80 , a connection line 60 (switch 37 ), a connection point 90 , a connection line 53 and a battery module group 41 .

During charging, the control unit 16 opens the valve 29 and operates the cooling circulation device 28 to circulate the cooling fluid in the cooling pipe 43 using the cooling circulation device 28 . As a result, the cooling fluid exchanges heat with the battery modules 12 that make up the battery 11, and overheating of the battery modules 12 during charging is prevented. Further, the electronic device such as the bus bar 39 shown in FIG. 3 can be cooled by the cooling fluid flowing through the cooling pipe 43 . Here, when charging the battery 11 , the control unit 16 may cause the cooling pipe 43 to flow cooling water used in a vehicle air conditioner for cooling the passenger compartment.

Electric power may be supplied to the air conditioner 27, the converter 26 and the V2X 25 even when the battery 11 is charged. The path through which power is supplied to air conditioner 27, converter 26 and V2X 25 is as described with reference to FIG.

At the time of charging, the vehicle-mounted load can be operated using the surplus electric power at the time of charging. Specifically, the battery 11 includes a large number of battery modules 12, and each battery module 12 requires a different charging time. Therefore, the control unit 16 monitors the voltage of each battery module 12, does not supply any more power to the fully charged battery module 12, and supplies the surplus power to the on-vehicle load. Here, for example, a cooling device, a pump, or the like, which constitutes the cooling circulation device 28, can be used as the vehicle-mounted load that is operated with the surplus electric power.

In this embodiment, the battery module group 40 and the battery module group 41 are connected in series during discharging while the vehicle is running, and the battery module group 40 and the battery module group 41 are connected in series during charging of the battery 11. connected in parallel. By doing so, high-voltage electric power for rotating the front motor 141 and the rear motor 142 at high speed can be supplied to the front inverter 18 and the rear inverter 19 during running. On the other hand, when charging the battery 11, by connecting the battery module group 40 and the battery module group 41 in parallel, the internal resistance of the charging circuit is reduced, and the voltage drop due to the wiring resistance connecting the battery modules 12 is output. Decrease can be suppressed. Moreover, it is possible to suppress the heat generation of the battery modules 12 and the connection wiring, and reduce the power loss. Furthermore, by suppressing the heat generation of the battery modules 12 and the connecting wires, the suppression of the output due to the temperature limitation is alleviated.

Considering that the maximum allowable temperature of the lithium-ion battery employed as the battery module 12 is about 60° C., especially in the summer, if the battery 11 is charged in a series connection state, the temperature of the battery 11 rises, and the battery temperature rises. 11 may not be efficiently charged. In this embodiment, by connecting the battery module group 40 and the battery module group 41 constituting the battery 11 in parallel to the external connection part 24, heat generation of the battery module group 40, the battery module group 41, and the connection wiring is prevented. reducing the amount. Therefore, battery module group 40 and battery module group 41 can be efficiently charged by charging under a temperature environment below the maximum allowable temperature.

Also, if the battery module group 40 and the battery module group 41 are connected in series during charging, the control unit 16 controls the charging power according to the lower capacity, so that the batteries that do not need charging can be used. The surplus electric power is converted into heat by a resistor or the like, resulting in energy loss.

On the other hand, in the present embodiment, as described above, the battery module group 40 and the battery module group 41 are connected in parallel and charged. to drive load 44 or load 45. For example, when the charging of the battery module group 40 is completed and the charging of the battery module group 41 is not completed, the load 45 is driven with the surplus power to be supplied to the battery module group 40 . As the load 45, for example, a compressor for cooling the battery 11 or the like can be used.

Further, the control unit 16 controls the vehicle power supply 10 to air-condition the interior of the vehicle power supply 10 when the operation of the vehicle power supply 10 transitions from the discharging state shown in FIG. 4 to the charging state shown in FIG. You may switch the driving|running condition of an air conditioner. The cabin air conditioner consists of a vapor compression refrigeration cycle. When the vehicle power source device 10 is in a charged state, the battery 11 and the like are cooled by exchanging heat between the refrigerant of the vehicle interior air conditioner and the battery 11 and the like. Thereby, the battery 11 etc. can be cooled more effectively. At this time, by operating the compressor of the vehicle interior air conditioner with the above-described surplus electric power, the vehicle interior air conditioner can be operated more efficiently.

The above is the description of the operation of the vehicle power supply device 10 of the present embodiment.

Although the embodiments of the present invention have been described above, the present invention is not limited to these, and modifications can be made without departing from the gist of the present invention. In addition, each form described above can be combined with each other.

For example, as described with reference to FIG. Charging can also be performed in a state in which more than one line is connected in parallel.

Furthermore, in the present embodiment described above, the battery 11 is connected in series during discharging and in a two-line parallel state during charging, but this connection form can be changed. For example, the battery 11 may be in a two-line parallel state during discharging, and may be in a three-line parallel state during charging. That is, the number of parallel-connected columns during charging of the battery 11 is made larger than the number of parallel-connected columns during discharging. As a result, it is possible to increase the voltage of the output power during discharging, and to suppress heat generation and resistance during charging.

10 Vehicle Power Supply 11 Battery 12 Battery Module 13 External Power Supply 14 Motor 141 Front Motor 142 Rear Motor 16 Control Unit 18 Front Inverter 19 Rear Inverter 20 Vehicle 21 Battery Arrangement Area 22 Body 23 Bottom 24 External Connection Portion 25 V2X
26 converter 27 air conditioner 28 cooling circulation device 29 valve 30 switching device 31 switch 32 switch 33 switch 34 switch 35 switch 36 switch 37 switch 39 bus bar 40 battery module group 41 battery module group 42 junction box 43 cooling pipe 44 load 45 load 51 connection Line 52 Connection line 53 Connection line 54 Connection line 55 Connection line 56 Connection line 57 Connection line 58 Connection line 59 Connection line 60 Connection line 61 Connection line 62 Connection line 63 Connection line 64 Connection line 65 Connection line 66 Connection line 67 Connection line 69 Connection line 80 Connection point 81 Connection point 82 Connection point 83 Connection point 84 Connection point 85 Connection point 86 Connection point 87 Connection point 88 Connection point 89 Connection point 90 Connection point 91 Connection point

Claims (9)

a battery consisting of a plurality of battery modules connecting a plurality of battery cells;
a power supply connection line that connects an external power supply, which is a power supply that exists outside the vehicle, or a vehicle-mounted load, and the battery;
The battery module is connected to the power supply connection line and is connected to the on-vehicle load to discharge the battery, and the battery is connected to the external power supply to charge the battery module. a control unit that changes the
The control unit changes the connection configuration of the battery module when charging of the battery starts,
A power source apparatus for a vehicle, wherein the control unit operates a cooling circulation device that cools the battery during the charging. a battery consisting of a plurality of battery modules connecting a plurality of battery cells;
a power supply connection line that connects an external power supply that is a power supply existing outside the vehicle or a load mounted on the vehicle and the battery;
The battery module is connected to the power supply connection line, and the battery module is connected to the on-vehicle load for discharging, and the battery is connected to the external power supply for charging. a control unit that changes the
The control unit changes the connection configuration of the battery module when charging of the battery starts,
A power supply device for a vehicle, wherein the control unit cools the battery using a cooling device of the vehicle when charging of the battery is started. 3. The vehicle power supply apparatus according to claim 1, wherein the control unit cools an electronic device including a switching device and a switch during the charging. 2. The vehicle power supply device according to claim 1, wherein the control unit supplies surplus electric power to the cooling circulation device during the charging. 3. The vehicle power supply apparatus according to claim 1, wherein the control unit cools the electronic device including the switching device and the switch when charging of the battery begins. 3. The vehicle power supply device according to claim 2 , wherein surplus electric power generated when charging the battery is used to operate a compressor of the cooling device of the vehicle. the battery has a first battery module group consisting of a plurality of the battery modules and a second battery module group consisting of a plurality of the battery modules;
The control unit is
during the discharging, the first battery module group and the second battery module group are connected in series;
3. The vehicle power supply device according to claim 1 , wherein the first battery module group and the second battery module group are connected in parallel during the charging. 3. The vehicle power supply device according to claim 1, wherein the control unit changes the connection form of the battery module when the external power supply is connected to the vehicle. The control unit is
during the discharging, connecting the battery modules in series;
3. The vehicle power supply device according to claim 1 , wherein the battery modules are connected in parallel during the charging.

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