Electric vehicle

Abstract

The invention provides an electric vehicle. A first row of seats and a second row of seats located rearward of the first row of seats are disposed on a floor of the electric vehicle. And a battery is arranged below the floor. And a second electromechanical integrated unit is arranged behind the battery. An electric vehicle is provided with an on-board charger, a battery ECU, and a branch box as battery-related devices. And a battery ECU (Electronic Control Unit) and a branch box are arranged below the second row of seats and above the battery. And a vehicle-mounted charger is arranged above the second electromechanical integrated unit.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an electric vehicle. BACKGROUND

[0002] An electric vehicle in which a battery is provided under a floor in a passenger compartment is disclosed in Japanese Patent Application Publication No. 2018-158688. SUMMARY

[0003] In Japanese Patent Application Publication No. 2018-158688, as a vehicle lower structure, a structure related to a battery associated device that charges the battery and distributes electric power supplied from the battery is not disclosed. In an electric vehicle in which a battery is provided under a floor, there is room for study regarding a position at which a battery associated device is provided.

[0004] [MEANS FOR SOLVING PROBLEMS]

[0005] According to one embodiment of the present disclosure, an electric vehicle is driven by electric power accumulated by a battery. The electric vehicle is provided with a first electric motor and a second electric motor that serve as a power source that drives a drive wheel and are supplied with electric power accumulated by the battery. The electric vehicle is also provided with a first electric power control device that supplies electric power to the first electric motor and a second electric power control device that supplies electric power to the second electric motor. The electric vehicle is also provided with a first mechatronic unit composed of the first electric motor and the first electric power control device. The electric vehicle is also provided with a second mechatronic unit composed of the second electric motor and the second electric power control device. The electric vehicle is also provided with a plurality of battery associated devices. The battery is provided under a floor of the electric vehicle and between a front wheel and a rear wheel. The first mechatronic unit is provided in front of the battery. The second mechatronic unit is provided behind the battery. A first-row seat and a second-row seat located behind the first-row seat are provided on the floor of the electric vehicle. The plurality of battery associated devices are respectively provided below the second-row seat and above the battery and above the second mechatronic unit. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 is a schematic view that shows the structure of an electric system and a drive system in an electric vehicle of an embodiment.

[0007] Figure 2 is a schematic view that shows the configuration of devices in an electric vehicle of a first embodiment.

[0008] Figure 3 is a cross-sectional view of the electric vehicle along line 3-3 in Figure 2

[0009] Figure 4 is a cross-sectional view of the electric vehicle along line 4-4 in Figure 2

[0010] is a cross-sectional view of the electric vehicle along line 4-4 in​Figure 5 is a schematic view showing a configuration of a device in the electric vehicle of the second embodiment.

[0011] Figure 6 is a cross-sectional view of the electric vehicle along the line 6-6 in Figure 5 DETAILED DESCRIPTION

[0012] (First Embodiment)

[0013] Hereinafter, the first embodiment of the electric vehicle will be described with reference to Figures 1-4 The first embodiment of the electric vehicle will be described. In the following description, "front", "rear", "left", "right", "upper", and "lower" refer to "front", "rear", "left", "right", "upper", and "lower" as viewed from a passenger in a state facing the front of the vehicle. The left-right direction coincides with the vehicle width direction.

[0014] <About the Device Provided in the Electric Vehicle 10>

[0015] As shown in Figure 1 , the electric vehicle 10 is provided with a front wheel 11, a rear wheel 12, a first mechatronic unit 13, a second mechatronic unit 14, a battery 15, a first drive shaft 23, a second drive shaft 24, and a charging port 19. The first mechatronic unit 13 is provided with a first electric power control device 131, a first electric motor 132, and a power transmission mechanism not shown. The second mechatronic unit 14 is provided with a second electric power control device 141, a second electric motor 142, and a power transmission mechanism not shown. Furthermore, the electric vehicle 10 is provided with an on-board charger 20, a battery ECU (Electronic Control Unit) 21, and a branch box 22 as battery-related devices. The branch box 22 is provided with a cut-off relay 25. The ECU is provided with a CPU, a memory in which programs and data for control are stored. The ECU performs various control-related processing by the CPU executing the programs stored in the memory.

[0016] <About the Electrical System of the Electric Vehicle 10>

[0017] Figure 1 The dashed lines shown in the figure represent wiring harnesses. The charging port 19 and the on-board charger 20 are electrically connected by a wiring harness 100. The branch box 22 and the battery 15 are electrically connected by a wiring harness 110. The battery ECU 21 and the battery 15 are electrically connected by a wiring harness 120. The branch box 22 and the first electric power control device 131 are electrically connected by a wiring harness 130. The branch box 22 and the second electric power control device 141 are electrically connected by a wiring harness 140. The branch box 22 and the on-board charger 20 are electrically connected by a wiring harness 101. The branch box 22 and the battery ECU 21 are electrically connected by a wiring harness 150.

[0018] ​<About the battery-related devices provided in the electric vehicle 10>

[0019] The on-board charger 20, which is a battery-related device, is a device that charges the battery 15 with electric power from an external charging device. The on-board charger 20 is input with alternating-current electric power from an alternating-current power source connected to the charging port 19 via the wire harness 100. The charging port 19 is inserted with a charging plug of the external charging device. The charging port 19 and the on-board charger 20 are used for ordinary charging with an alternating-current power source of 100 V or 200 V, etc. The on-board charger 20 converts the input alternating-current electric power into direct-current electric power. The on-board charger 20 inputs the converted direct-current electric power to the battery 15 via the wire harness 101, the branch box 22, and the wire harness 110. Thus, the battery 15 is charged with the external charging device.

[0020] The battery ECU 21, which is a battery-related device, is a device that controls charging and discharging of the battery 15. The battery ECU 21 acquires information of an input current, an output current, a voltage, a temperature, etc. of the battery 15 via the wire harness 120. The battery ECU 21 estimates a capacity CH of the battery 15, a full charge capacity CHmax of the battery 15, a state of charge SOC of the battery 15, and a state of health SOH of the battery 15 on the basis of the acquired information. The capacity CH of the battery 15 is an amount of electricity accumulated in the battery 15 at the time when the battery ECU 21 acquires the information. The full charge capacity CHmax of the battery 15 is a maximum value of an amount of electricity that the battery 15 can accumulate at the time when the battery ECU 21 acquires the information. The state of charge SOC of the battery 15 is a value obtained by dividing the full charge capacity CHmax by the capacity CH. The state of health SOH of the battery 15 is an index indicating how much the full charge capacity CHmax of the battery 15 at the time when the battery ECU 21 acquires the information has decreased compared to the full charge capacity CHmax of the battery 15 at the time of shipment. The battery ECU 21 controls charging and discharging of the battery 15 on the basis of the capacity CH, the full charge capacity CHmax, the state of charge SOC, and the state of health SOH of the battery 15.

[0021] The branch box 22, which is a battery-related device, is a device that branches direct-current electric power supplied from the battery 15 to a plurality of devices. The branch box 22 supplies high-voltage direct-current electric power output from the battery 15 to the first power control device 131 via the wire harness 130. The branch box 22 supplies high-voltage direct-current electric power output from the battery 15 to the second power control device 141 via the wire harness 140. The branch box 22 is provided with a DCDC converter that steps down a voltage of the direct-current electric power supplied from the battery 15 via the wire harness 110. The branch box 22 supplies the direct-current electric power stepped down by the DCDC converter to the battery ECU 21 via the wire harness 150.

[0022] The branch box 22 can also be configured to supply the direct-current electric power stepped down by the DCDC converter to devices other than the battery ECU 21. For example, the branch box 22 can also be configured to supply the direct-current electric power stepped down by the DCDC converter to an electric power steering as an auxiliary machine, and an electric oil pump. The electric power steering is a mechanism that assists the steering of the driver. The electric oil pump is a mechanism for pumping lubricating oil for cooling and lubrication of the electric motor.

[0023] The branch box 22 includes a cut-off relay 25. The cut-off relay 25 is a relay circuit that switches between a connected state in which electric power supplied from the battery 15 via the wire harness 110 is allowed to be energized, and a cut-off state in which energization is not allowed. In the case where the cut-off relay 25 is in the cut-off state, the battery 15 and the branch box 22 are electrically cut off. Thus, devices connected to the branch box 22 via the wire harness are also electrically cut off from the battery 15.

[0024] <Drive system of electric vehicle 10>

[0025] The first electric motor 132 and the second electric motor 142 are electric motors that serve as power sources for driving the drive wheels. The battery 15 accumulates electric power supplied to the first electric motor 132 and the second electric motor 142. The electric vehicle 10 drives the drive wheels by the electric power accumulated in the battery 15. The first electric motor 132 drives the front wheels 11 via the first drive shaft 23. The front wheels 11 are drive wheels. The second electric motor 142 drives the rear wheels 12 via the second drive shaft 24. The rear wheels 12 are drive wheels.

[0026] The first electric power control device 131 is an electric power control device that supplies electric power to the first electric motor 132. The first electric power control device 131 includes an inverter that converts direct-current electric power supplied from the battery 15 via the branch box 22 into alternating-current electric power and supplies the electric power to the first electric motor 132. The second electric power control device 141 is an electric power control device that supplies electric power to the second electric motor 142. The second electric power control device 141 includes an inverter that converts direct-current electric power supplied from the battery 15 via the branch box 22 into alternating-current electric power and supplies the electric power to the second electric motor 142.

[0027] The mechatronic unit can include a device other than the inverter as the electric power control device. For example, the mechatronic unit can include, in addition to the inverter, a DCDC converter that steps up direct-current electric power supplied from the battery 15 via the branch box 22. In this case, the inverter included as the electric power control device converts direct-current electric power supplied from the DCDC converter into alternating-current electric power and supplies the electric power to the electric motor. The mechatronic unit can include, as the electric power control device, an ECU that controls electric power supplied to the electric motor.

[0028] <Internal structure of electric vehicle 10 according to first embodiment>

[0029] Figure 2 The configuration of the equipment in the plan view of the electric vehicle 10 of the first embodiment is schematically shown. The battery 15 shown by a broken line is disposed below the floor 16. The first mechatronic unit 13 is disposed in front of the battery 15. The second mechatronic unit 14 is disposed behind the battery 15. The battery 15 is disposed between the first mechatronic unit 13 and the second mechatronic unit 14. The battery 15 is disposed between the front wheels 11 and the rear wheels 12. The on-board charger 20 is disposed above the second mechatronic unit 14. The charging port 19 is disposed on the left side surface of the vehicle behind the battery 15.

[0030] The first-row seat 17 and the second-row seat 18 are disposed above the floor 16. The second-row seat 18 is disposed behind the first-row seat 17. The first-row seat 17 has a right seat 17A and a left seat 17B. The right seat 17A and the left seat 17B are arranged left and right. The central passage 30 described later is arranged between the right seat 17A and the left seat 17B.

[0031] Figure 3 is a schematic view of a cross section along the line 3-3 in Figure 2 . The use of Figure 3 will be described with respect to the positional relationship between the second-row seat 18, the central passage 30, the battery ECU 21, and the branch box 22. As shown in Figure 3 , the floor 16 is curved into a convex shape bulging upward. Thus, the central passage 30 is formed below the floor 16 and above the battery 15. The central passage 30 is disposed below the seat surface 181 of the second-row seat 18. The seat surface 181 of the second-row seat 18 is also curved into a convex shape bulging upward in correspondence with the curvature of the floor 16. The seat surface 181 is composed of a seat surface 181R on the right side of the central passage 30, a seat surface 181C above the central passage 30, and a seat surface 181L on the left side of the central passage 30. The seat surface 181R, the seat surface 181C, and the seat surface 181L are continuous seat surfaces 181. The seat surface 181R is the seat surface 181 of the right seat of the second-row seat 18. The seat surface 181L is the seat surface 181 of the left seat of the second-row seat 18. The seat surface 181R and the seat surface 181L are disposed at positions lower than the seat surface 181C.

[0032] The battery ECU 21 and the branch box 22 are disposed inside the central passage 30 below the second-row seat 18 and above the battery 15. The branch box 22 is disposed above the battery 15 in superposition. The battery ECU 21 is disposed above the branch box 22 in superposition. The battery ECU 21 and the branch box 22 are disposed below the seat surface 181C. No battery-related equipment is disposed below the seat surface 181R and the seat surface 181L.

[0033] Figure 4 is a schematic view of a cross section along the line 3-3 inFigure 2 a cross section of the 4-4 line in FIG. 4-4. Figure 4 The internal structure of the electric vehicle 10 is schematically shown as viewed from the left side. As shown in FIG. 4-3, the central passage 30 extends in the front-rear direction. The on-board charger 20 is disposed above the second mechatronic unit 14. Figure 4

[0034] <Effects of the First Embodiment>

[0035] As shown in FIG. 4-3, the battery ECU 21 and the branch box 22 are not disposed below the seat surface 181L on the left side in the second-row seats 18 nor below the seat surface 181R on the right side, but are disposed inside the central passage 30 below the seat surface 181C. Thus, as compared with a vehicle in which the battery-related devices are disposed below the seat surface 181L on the left side or below the seat surface 181R on the right side of the second-row seats 18 without the central passage 30, it is possible to lower the seat surfaces 181. Specifically, it is possible to lower each of the seat surfaces 181R and 181L in the second-row seats 18 on which the occupants sit. Thus, it is possible to lower the seating positions of the occupants. Therefore, it is possible to lower the vehicle height of the electric vehicle 10. Figure 3 <Effects of the First Embodiment>

[0036]

[0037] (1-1) The electric vehicle 10 can achieve a design in which the vehicle height is lowered.

[0038] (1-2) The on-board charger 20 is disposed above the second mechatronic unit 14. The second mechatronic unit 14 is disposed behind the battery 15. The charging port 19 is disposed behind the battery 15 and on the side surface of the vehicle. That is, both the on-board charger 20 and the charging port 19 are disposed behind the battery 15. Therefore, as compared with a case in which the on-board charger 20 is disposed below the second-row seats 18 and above the battery 15, it is possible to shorten the distance between the on-board charger 20 and the charging port 19. Thus, it is possible to shorten the wire harness 100 that connects the on-board charger 20 and the charging port 19. If the wire harness is short, the weight of the wire harness is reduced. That is, the weight of the vehicle is reduced. Further, if the wire harness is short, the power loss of the wire harness is also reduced. Moreover, it is possible to reduce the power loss of the wire harness 100 that connects the on-board charger 20 and the charging port 19.

[0039] ​​(1-3) The battery 15 is connected with the branch box 22 through the wire harness 110. The branch box 22 is provided below the second-row seat 18 and above the battery 15. In this configuration, compared with the case where the branch box 22 is provided above the second mechatronic unit 14, the distance between the branch box 22 and the battery 15 can be shortened. Therefore, the wire harness 110 connecting the battery 15 and the branch box 22 can be shortened. If the wire harness is short, the weight of the wire harness is reduced. That is, the weight of the vehicle is reduced. Further, if the wire harness is short, the power loss of the wire harness is also reduced. Further, the electric vehicle 10 can reduce the power loss of the wire harness 110 connecting the battery 15 and the branch box 22.

[0040] (1-4) Sometimes, high voltage is applied to the wire harness 110 connecting the branch box 22 and the battery 15. The branch box 22 is provided below the second-row seat 18 and above the battery 15. The branch box 22 is provided with the cut-off relay 25. Therefore, compared with the case where the branch box 22 is provided above the second mechatronic unit 14, the power of high voltage supplied from the battery 15 can be cut off by the cut-off relay 25 at a position close to the battery 15. Thereby, the safety of the electric vehicle 10 can be further improved.

[0041] <Modification of the First Embodiment>

[0042] The above-described first embodiment can be implemented in the following manner. The present embodiment and the following modifications can be implemented in combination with each other within a range that does not contradict the technology.

[0043] • Within the central passage 30 below the second-row seat 18 and above the battery 15, the branch box 22 can also be provided above the battery ECU 21 in a superposed manner. Even in this case, compared with the case where the branch box 22 is provided above the second mechatronic unit 14, the distance between the branch box 22 and the battery 15 can be shortened. Therefore, the wire harness 110 connecting the battery 15 and the branch box 22 can be shortened.

[0044] • Within the central passage 30 below the second-row seat 18 and above the battery 15, the battery-related devices can also be provided without being superposed in the vertical direction. For example, within the central passage 30 below the second-row seat 18 and above the battery 15, the battery ECU 21 and the branch box 22 can be arranged in the front-rear direction. For example, within the central passage 30 below the second-row seat 18 and above the battery 15, the battery ECU 21 and the branch box 22 can be arranged side by side.

[0045] • As long as at least one battery-related device is provided within the central passage 30 below the second-row seat 18 and above the battery 15 and above the second mechatronic unit 14, respectively, the battery ECU 21 can be provided above the second mechatronic unit 14.

[0046] • The branch box 22 can also be provided above the second mechatronic unit 14, provided that at least one battery-associated device is provided inside the central passage 30 below the second-row seat 18 and above the battery 15, and above the second mechatronic unit 14.

[0047] • The on-board charger 20 can also be provided inside the central passage 30, provided that at least one battery-associated device is provided inside the central passage 30 below the second-row seat 18 and above the battery 15, and above the second mechatronic unit 14.

[0048] (Second Embodiment)

[0049] Next, the second embodiment will be described with reference to Figure 5 and Figure 6 The second embodiment will be described with respect to the differences from the first embodiment. The electric vehicle 10 of the second embodiment does not have the central passage 30 in the electric vehicle 10 of the first embodiment.

[0050] <Internal structure of the electric vehicle 10 of the second embodiment>

[0051] Figure 5 The arrangement of the devices of the electric vehicle 10 of the second embodiment is schematically shown in plan view. The battery 15, shown by a broken line, is provided below the floor 16.

[0052] The first mechatronic unit 13 is provided in front of the battery 15. The second mechatronic unit 14 is provided behind the battery 15. The battery 15 is provided between the first mechatronic unit 13 and the second mechatronic unit 14. The on-board charger 20 is provided above the second mechatronic unit 14.

[0053] The first-row seat 17 and the second-row seat 18 are provided above the floor 16. The second-row seat 18 is provided behind the first-row seat 17. The battery ECU 21 and the branch box 22, shown by a single-dot chain line, are provided below the second-row seat 18 and above the battery 15.

[0054] The positional relationship between the second-row seat 18, the battery ECU 21, and the branch box 22 will be described with reference to Figure 6 Figure 6 is a schematic view of a cross section along the line 6-6 in Figure 5 As shown in Figure 6 , the battery ECU 21 and the branch box 22 are provided below the second-row seat 18 and above the battery 15. The battery ECU 21 and the branch box 22 are arranged side by side. The battery ECU 21 is provided on the right side. The branch box 22 is provided on the left side.​

[0055] <Function of the Second Implementation Method>

[0056] like Figure 6 As shown, the battery ECU 21 and branch box 22, which are battery-associated devices, are located below the second-row seats 18 and above the battery 15. Figure 5 As shown, the on-board charger 20, which serves as a battery-connected device, is positioned above the second mechatronic unit 14. That is, the battery-connected devices are respectively positioned below the second-row seats 18 and above the battery 15, and above the second mechatronic unit 14. Therefore, compared to vehicles where the battery-connected devices are concentrated below the second-row seats 18 and above the battery 15, the vehicle height can be reduced.

[0057] <Effects of the Second Implementation>

[0058] (2-1) It enables the design of an electric vehicle 10 with a reduced vehicle height.

[0059] (2-2) The battery ECU 21 is located below the second-row seat 18 and above the battery 15. Compared to the case where the battery ECU 21 is located above the second mechatronic unit 14, the distance between the battery ECU 21 and the battery 15 can be shortened. Therefore, the wiring harness 120 connecting the battery ECU 21 and the battery 15 can be shortened. If the wiring harness is shorter, the weight of the wiring harness is reduced. That is, the weight of the vehicle is reduced. In addition, if the wiring harness is shorter, the power loss of the wiring harness is also reduced. Moreover, the power loss of the wiring harness 120 connecting the battery ECU 21 and the battery 15 can be reduced.

[0060] <Example of a modification to the second embodiment>

[0061] The second embodiment described above can be implemented by modification as follows. This embodiment and the following modifications can be combined with each other within the scope of technical inconsistency.

[0062] • As long as at least one battery-associated device is provided below the second-row seat 18 and above the battery 15 and the second electromechanical unit 14 respectively, the battery ECU 21 can also be located above the second electromechanical unit 14.

[0063] • As long as at least one battery-associated device is provided below the second row of seats 18 and above the battery 15 and the second electromechanical unit 14, the branch box 22 can also be provided above the second electromechanical unit 14.

[0064] • The on-vehicle charger 20 can also be provided below the second-row seats 18 and above the battery 15, as long as at least one battery-associated device is provided below the second-row seats 18 and above the battery 15 and above the second electromechanical integrated unit 14, respectively.

[0065] • The position where the battery-associated device is provided below the second-row seats 18 and above the battery 15 of the electric vehicle 10 is not limited to the position described in the second embodiment. For example, the battery ECU 21 can also be provided on the left side below the second-row seats 18 and above the battery 15. The branch box 22 can also be provided on the right side below the second-row seats 18 and above the battery 15. For example, the battery ECU 21 and the branch box 22 can both be provided on the right side below the second-row seats 18 and above the battery 15. For example, the battery ECU 21 and the branch box 22 can both be provided on the left side below the second-row seats 18 and above the battery 15. For example, the battery ECU 21 and the branch box 22 can both be provided at the center below the second-row seats 18 and above the battery 15. For example, the battery ECU 21 and the branch box 22 can be arranged in front of and behind each other below the second-row seats 18 and above the battery 15.

[0066] <Other Modified Examples>

[0067] Further, as elements that can be commonly modified in each of the above embodiments, there are elements as described below. The following modified examples can be implemented in combination with each other within a range in which they are not technically contradictory.

[0068] • The battery ECU 21 can also perform control other than charging and discharging of the battery 15. For example, the battery ECU 21 can control charging of the electric vehicle 10 by an external charging device in a case where the external charging device is connected to the charging port 19. The battery ECU 21 can control driving of the first electric motor 132 by controlling electric power supplied from the battery 15 to the first electric power control device 131. The battery ECU 21 can control driving of the second electric motor 142 by controlling electric power supplied from the battery 15 to the second electric power control device 141. The battery ECU 21 can be a comprehensive ECU that controls the electric vehicle 10.

[0069] • The branch box 22 can not be provided with the cut-off relay 25. For example, the battery 15 can be provided with the cut-off relay 25. Even in this case, it is possible to cut off high-voltage electric power supplied from the battery 15 by the cut-off relay 25.

[0070] • The battery 15 and the battery ECU 21 can also be connected by means other than the wire harness 120. For example, the battery 15 and the battery ECU 21 can also be connected by a bus bar. The battery 15 and the branch box 22 can also be connected by means other than the wire harness 110. The battery 15 and the branch box 22 can also be connected by a bus bar. The battery ECU 21 and the branch box 22 can also be connected by means other than the wire harness 150. The battery ECU 21 and the branch box 22 can also be connected by a bus bar. The on-board charger 20 and the branch box 22 can also be connected by means other than the wire harness 101. In a case where the on-board charger 20 and the branch box 22 are provided below the second-row seat 18 and above the battery 15, the on-board charger 20 and the branch box 22 can also be connected by a bus bar. In this case, the battery ECU 21 is provided above the second mechatronic unit 14.

[0071] • The electric vehicle 10 can also be configured to be able to use a direct-current power supply as an external charging device that charges the battery 15. For example, the charging port 19 can also be configured to be able to be used for rapid charging using a 50 kW or the like direct-current high-voltage power supply. In this case, the charging port 19 is electrically connected to the branch box 22 in addition to the on-board charger 20. The charging port 19 and the branch box 22 can also be electrically connected by a wire harness. Thereby, direct-current electric power input from the direct-current power supply connected to the charging port 19 is supplied to the battery 15 via the branch box 22.

[0072] • The charging port 19 is provided on the left side surface of the vehicle behind the battery 15. The position of the charging port 19 is not limited to the left side surface of the vehicle behind the battery 15. The charging port 19 can also be provided on the right side surface of the vehicle behind the battery 15 as long as at least one battery-associated device is provided below the second-row seat 18 and above the battery 15 and above the second mechatronic unit 14, respectively. The charging port 19 can also be provided in front of the battery 15.

Claims

1. An electric vehicle provided with drive wheels driven by electric power accumulated in a battery, wherein the electric vehicle is provided with: first and second electric motors that are power sources for driving the drive wheels and are supplied with electric power accumulated in the battery; first and second electric power control devices that supply electric power to the first and second electric motors, respectively; a first electromechanical unit composed of the first electric motor and the first electric power control device; a second electromechanical unit composed of the second electric motor and the second electric power control device; and a plurality of battery-related devices, the battery is disposed below a floor of the electric vehicle and between front and rear wheels, the first electromechanical unit is disposed in front of the battery, the second electromechanical unit is disposed behind the battery, on the floor, a first-row seat and a second-row seat located behind the first-row seat are provided, and the plurality of battery-related devices are respectively disposed below the second-row seat and above the battery and above the second electromechanical unit.

2. The electric vehicle according to claim 1, wherein as the battery-related devices, the electric vehicle is provided with: a battery ECU that controls charging and discharging of the battery; an on-board charger that charges the battery with electric power from outside; and a branch box that branches electric power supplied from the battery.

3. The electric vehicle according to claim 1 or 2, wherein the electric vehicle is provided with a charging port that can be connected to an alternating-current power source, the charging port is connected to the on-board charger through a wire harness, the charging port is disposed behind the battery and at a side surface of the electric vehicle, and the on-board charger is disposed above the second electromechanical unit.

4. The electric vehicle according to any one of claims 1 to 3, wherein as the battery-related devices, the branch box is provided with a cut-off relay that cuts off electric power supplied from the battery, the battery and the branch box are connected through a wire harness, and the branch box is disposed below the second-row seat and above the battery.

5. The electric vehicle according to any one of claims 1 to 4, wherein as the battery-related devices, the battery ECU is disposed below the second-row seat and above the battery.

6. The electric vehicle according to any one of claims 1 to 5, wherein as the battery-related devices, the on-board charger is disposed above the second electromechanical unit, and the battery ECU and the branch box are disposed below the second-row seat and above the battery.

7. The electric vehicle according to any one of claims 1 to 6, wherein as the first-row seat, two seats are arranged side by side, a center passage is provided between the two seats, the center passage is disposed below the floor and above the battery, the center passage is disposed on the floor in such a manner as to extend in a front-rear direction of the electric vehicle, and the center passage is disposed below a seat surface of the second-row seat. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The plurality of battery-related devices are respectively disposed inside the central passage below the second row of seats and above the battery and above the second mechatronic unit. The plurality of battery-related devices are respectively disposed inside the central passage below the second row of seats and above the battery and above the second mechatronic unit.

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