Electric vehicle and power discharge point

Abstract

An electric vehicle (100) comprises a battery (110) and a power discharge device (111) for discharging power from the battery (110). The power discharge device (111) boosts the discharged power in accordance with the voltage drop rate equivalent of power wiring (20) connecting a power discharge point (8) to which the electric vehicle (100) is connected and an individual subdivision (3) of a building.

Description

Electric vehicle and discharge stand ,

[0005]

[0001] The present disclosure relates to an electric vehicle and a discharge stand.

[0002] A system for discharging electricity from an electric vehicle to an electrical device is known. As an example of this system, a V2X (Vehicle to X) system can be cited. Patent Document 1 discloses the following technology regarding a system for discharging electricity from an electric vehicle to an electrical device. The discharge system (referred to as a power supply system in this document) switches the power supply destination of the electric vehicle from a facility to an elevator based on a predetermined command.

[0003] Japanese Patent Application Laid-Open No. 2025-10741 <00,00008> By the way, an electric vehicle may discharge electricity to a residential house or a store. In this case, the power may not be sufficiently supplied to the residential house or the store. Then, there is a possibility that the electrical devices in the residential house or the store cannot be operated in the same way as usual.

[0005] (1) An electric vehicle according to one aspect of the present disclosure includes a battery and a discharge device that discharges power from the battery. The discharge device boosts the power to be discharged according to the amount corresponding to the voltage drop rate of the power wiring that connects the discharge stand to which the electric vehicle is connected and an individual section of a building.

[0006] According to this configuration, since the power is boosted according to the voltage drop rate of the power wiring, when the electric vehicle discharges to an individual section, it is possible to suppress the occurrence of interference with the operation of the electrical devices in the individual section. Here, an individual section is a section in a building that is assigned to be exclusively used by a person, a corporation, or an organization.

[0007] (2) In the electric vehicle according to (1) above, the amount corresponding to the voltage drop rate is the voltage drop rate of the power wiring or the length of the power wiring when the thickness of the power wiring in each individual section of the building is uniform. According to this configuration, the boost rate of the power can be set based on the voltage drop rate or the length of the power wiring.

[0008] (3) The electric vehicle described in (1) or (2) above is further equipped with a communication unit, the communication unit acquires the voltage drop rate equivalent amount from an external terminal. With this configuration, the electric vehicle can acquire the voltage drop rate equivalent amount by communication.

[0009] (4) In the electric vehicle described in any one of (1) to (3) above, the individual compartment is a dwelling unit or a shop. With this configuration, when the electric vehicle discharges into a dwelling unit or shop, interference with the operation of electrical equipment in the dwelling unit or shop is suppressed.

[0010] (5) A discharge stand according to a further aspect of the present disclosure is a discharge stand for discharging power from an electric vehicle to an individual compartment of a building, comprising: a discharge outlet connected to the electric vehicle via a discharge cable; and a boost circuit for boosting the power discharged from the electric vehicle, wherein the boost circuit boosts the power to be discharged in proportion to the amount equivalent to the voltage drop rate of the power wiring connecting the discharge stand and the individual compartment of the building.

[0011] In this configuration, the discharge station boosts the power discharged from the electric vehicle according to the voltage drop rate of the power wiring. Therefore, when the discharge station supplies power to individual sections based on the discharge of the electric vehicle, disruptions to the operation of electrical equipment in those sections are suppressed.

[0012] (6) In the discharge stand described in (5) above, the amount equivalent to the voltage drop rate is the voltage drop rate of the power wiring, or the length of the power wiring when the thickness of the power wiring in each individual section of the building is uniform. With this configuration, the power boost rate can be set based on the voltage drop rate or the length of the power wiring.

[0013] (7) The discharge stand described in (5) or (6) above further comprises a memory unit which stores the amount equivalent to the voltage drop rate. With this configuration, the boost circuit can set the boost rate based on the amount equivalent to the voltage drop rate stored in the memory unit.

[0014] (8) In the discharge station described in any one of (5) to (7) above, the individual compartment is a dwelling or a shop. With this configuration, when the discharge station supplies power to a dwelling or shop based on the discharge of an electric vehicle, interference with the operation of electrical equipment in the dwelling or shop is suppressed.

[0015] The electric vehicle and discharge station of this disclosure make it possible to suppress interference with the operation of electrical equipment in individual compartments when discharging to individual compartments.

[0016] This is a schematic diagram of an electric vehicle according to the first embodiment. This is a schematic diagram of a building. This is a schematic diagram showing the relationship between the building, the charging / discharging station, and the electric vehicle. This is a schematic diagram of the charging / discharging station. This is a schematic diagram showing the relationship between the building, the charging / discharging station, and the electric vehicle according to the second embodiment.

[0017] <First Embodiment> The electric vehicle 100 of this embodiment will be described with reference to Figures 1 to 4. The electric vehicle 100 is an automobile that is powered by electricity stored in a battery 110. Specifically, the electric vehicle 100 includes BEVs (Battery Electric Vehicles) and PHEVs (Plug-in Hybrid Electric Vehicles).

[0018] [Electric Vehicle] As shown in Figure 1, the electric vehicle 100 includes a battery 110 and a discharge device 111 for discharging power from the battery 110. The electric vehicle 100 further includes a communication unit 112.

[0019] The electric vehicle 100 can supply power to the building 1 via the discharge device 111. For example, in the event of a power outage of the commercial power supply 13, the electric vehicle 100 supplies power to an individual section 1A of the building 1 via the discharge device 111. An individual section 1A is a section within the building 1 that is allocated for exclusive use by a person, corporation, or organization. In this embodiment, the building 1 is an apartment building. An individual section 1A is a dwelling unit 3 of the apartment building.

[0020] In this embodiment, the building 1 can take various forms. The building 1 may be a detached house or an apartment building. Alternatively, the building 1 may be a collection of multiple independent detached dwelling units 3 within a predetermined area. A dwelling unit 3 of the building 1 refers to one dwelling unit 3 within the building 1.

[0021] Parking lot 5 may be located far from building 1, or it may be located close to building 1. Furthermore, parking lot 5 may have multiple parking spaces 6. For these reasons, the distance from the discharge stand 8 installed in parking lot 5 to the dwelling unit 3 varies depending on the form of building 1, the form of parking lot 5, and the distance from building 1 to parking lot 5. Consequently, the lengths of the power wiring 20, 50 connecting the discharge stand 8 and the dwelling unit 3 also vary. The longer the power wiring 20, 50, the greater the voltage drop. A large voltage drop in the power wiring 20, 50 may cause problems with the operation of the electrical equipment 16 to which the discharge is directed. For these reasons, in this embodiment, the discharge device 111 of the electric vehicle 100 has the following configuration.

[0022] The discharge device 111 increases the voltage of the discharged power in accordance with the amount equivalent to the voltage drop rate of the power wiring 20, 50 that connects the discharge stand 8 to which the electric vehicle 100 is connected and the dwelling unit 3 of the building 1.

[0023] The communication unit 112 obtains an amount equivalent to the voltage drop rate from an external terminal. The external terminal is, for example, a smartphone, a personal computer, or a server connected to the internet. When supplying power from the electric vehicle 100 to the dwelling unit 3 using the discharge stand 8, the electric vehicle 100 obtains an amount equivalent to the voltage drop rate from the external terminal before using the discharge stand 8. When the electric vehicle 100 obtains an amount equivalent to the voltage drop rate, the communication unit 112 communicates with the external terminal. When the communication unit 112 becomes able to communicate with the external terminal, it receives an amount equivalent to the voltage drop rate from the external terminal. The amount equivalent to the voltage drop rate is stored in the internal memory of the discharge device 111 or in an external memory provided outside the discharge device 111.

[0024] The equivalent voltage drop rate is the voltage drop rate of the power wiring 20, 50, or the length of the power wiring 20, 50 in each dwelling unit 3 of building 1 when the thickness of the power wiring 20, 50 is uniform.

[0025] In the first example, the discharge device 111 increases the discharge voltage in accordance with the voltage drop rate, which is the equivalent amount of the voltage drop rate. If the voltage drop rate is 10%, the discharge device 111 increases the discharge voltage by 10%.

[0026] In the second example, the discharge device 111 increases the discharge voltage according to the length of the power wiring 20, 50, which is equivalent to the voltage drop rate. In one example, if the length of the power wiring 20, 50 is Xm, the discharge device 111 calculates the product of X and a predetermined coefficient. The predetermined coefficient is a value that is set in advance according to the length of the power wiring 20, 50. Then, the discharge device 111 increases the discharge voltage by the product value.

[0027] Next, a specific example of the building 1 to which the electric vehicle 100 discharges will be described. [Building] Building 1 is a building used by people. Building 1 comprises a building body 2, a parking lot 5, and a charging / discharging station 8X. In this embodiment, the charging / discharging station 8X is one form of the discharging station 8. The charging / discharging station 8X has a discharge function that supplies power for the discharge of the electric vehicle 100 to the building 1, and a charging function that charges the battery 110 of the electric vehicle 100 by power supply from the building 1. Building 1 further comprises a plurality of power wirings 20, 50. Building 1 further comprises a relay section 10 provided in the building body 2. Building 1 further comprises a conduit 30 that protects the power wirings 20, 50.

[0028] [Building Body] As shown in Figure 2, in this embodiment, the building body 2 is an apartment building. The building body 2 includes multiple dwelling units 3. In this embodiment, one dwelling unit 3 is associated with one parking space 6 on a one-to-one basis. Also, one dwelling unit 3 is associated with one charging / discharging station 8X provided in the parking space 6 on a one-to-one basis. The resident of one dwelling unit 3 has exclusive use of the parking space 6 associated with that dwelling unit 3 and the charging / discharging station 8X associated with that dwelling unit 3.

[0029] The main building 2 draws power from the commercial power supply 13 via a distribution board 14. Multiple dwelling units 3 receive power from the distribution board 14. As shown in Figure 3, each dwelling unit 3 has a distribution board 15 and a switching device 54. The distribution board 15 of each dwelling unit 3 is connected to the distribution board 14. The distribution board 15 distributes power to one or more electrical devices 16 in the dwelling unit 3. The electrical devices 16 in each room are connected to the distribution board 15 via outlets. The distribution board 15 also supplies power to charging / discharging stands 8X that are associated one-to-one with each dwelling unit 3. The charging / discharging stands 8X that are associated one-to-one with each dwelling unit 3 are connected to the distribution board 15 via power wiring 20, 50.

[0030] A power meter 19 is connected to the distribution board 15 to measure power consumption. The power meter 19 measures the amount of power consumed downstream of the distribution board 15. Specifically, the power meter 19 measures the total amount of power used within the dwelling unit 3 and the amount of power supplied from the distribution board 15 to the charging / discharging station 8X for charging the electric vehicle 100. This allows the total amount of power used by the residents to be determined. Another power meter 19 may be connected to the power wiring 20 for battery charging. This allows the amount of power used for charging the electric vehicle 100 to be determined.

[0031] The switching device 54 switches the power supply source to the electrical equipment 16 in the dwelling unit 3 between the commercial power supply 13 and the electric vehicle 100. When the commercial power supply 13 is functioning normally, the switching device 54 connects the electrical equipment 16 in the dwelling unit 3 to the commercial power supply 13. When the commercial power supply 13 is down and the electric vehicle 100 is in a dischargeable state, the switching device 54 connects the electrical equipment 16 in the dwelling unit 3 to the electric vehicle 100. The switching operation of the switching device 54 may be performed manually or automatically.

[0032] In this embodiment, the switching device 54 is connected to a first power wiring 51 for battery discharge (see below), a relay power wiring 55 extending from the distribution board 15, and the in-unit power wiring 27. The switching device 54 switches the in-unit power wiring 27 between the first power wiring 51 and the relay power wiring 55. The in-unit power wiring 27 is wiring connected to electrical equipment 16. The switching device 54 can switch the power supply source to the in-unit power wiring 27 connected to the electrical equipment 16 between the commercial power supply 13 and the electric vehicle 100. If the commercial power supply 13 fails, the in-unit power wiring 27 and the first power wiring 51 are connected. This allows power to be supplied from the electric vehicle 100 to the electrical equipment 16.

[0033] [Parking Lot] Parking lot 5 is provided adjacent to the main building 2. In this embodiment, parking lot 5 is provided on the ground. Parking lot 5 may be a multi-story parking garage configured to accommodate multiple cars vertically.

[0034] Parking lot 5 includes a plurality of parking spaces 6. Each parking space 6 is partitioned so that one car can be parked there. In this embodiment, the parking spaces 6 are partitioned by white lines placed on the paved ground.

[0035] In one example, the parking lot 5 is composed of multiple rows 5A. Each row 5A is composed of multiple parking spaces 6. The extension direction DX of row 5A is defined as the direction in which the multiple parking spaces 6 are lined up. The arrangement direction DY of the multiple rows 5A is defined as the direction in which the multiple rows 5A are lined up. The arrangement direction DY of the multiple rows 5A intersects with the extension direction DX of row 5A. This arrangement of multiple rows 5A reduces variations in the length of the power wiring 20, 50 connecting the charging / discharging stands 8X in the multiple parking spaces 6 to the dwelling units 3 associated with the charging / discharging stands 8X, compared to the case where all the parking spaces 6 are lined up in a single row.

[0036] [Power Wiring] Referring to Figure 3, the power wiring 20 for battery charging that connects the dwelling unit 3 and the charging / discharging stand 8X associated with the dwelling unit 3 will be described. The power wiring 20 comprises a first power wiring 21 and a second power wiring 22. The first power wiring 21 extends from the dwelling unit 3 to the relay unit 10. The first power wiring 21 is connected to the distribution board 15 in the dwelling unit 3. The second power wiring 22 extends from the relay unit 10 to the charging / discharging stand 8X. The second power wiring 22 is connected to the first power wiring 21 by the relay unit 10. The pair of the first power wiring 21 and the second power wiring 22 is fixed. That is, the first power wiring 21 is connected to the second power wiring 22, which is pre-configured to be connected to the first power wiring 21.

[0037] Referring to Figure 3, a power wiring 50 for battery discharge connecting the dwelling unit 3 and the charging / discharging stand 8X associated with the dwelling unit 3 will be described. The power wiring 50 comprises a first power wiring 51 and a second power wiring 52. The first power wiring 51 extends from the dwelling unit 3 to the relay unit 10. The first power wiring 51 is connected to the switching device 54 in the dwelling unit 3. The second power wiring 52 extends from the relay unit 10 to the charging / discharging stand 8X. The second power wiring 52 is connected to the first power wiring 51 by the relay unit 10. The pair of the first power wiring 51 and the second power wiring 52 is fixed. That is, the first power wiring 51 is connected to the second power wiring 52, which is pre-configured to be connected to the first power wiring 51.

[0038] The relay unit 10 has a plurality of terminals 10A. The number of terminals 10A is equal to the number of power wirings 20 and 50. Terminal 10A connects one first power wiring 21 to a second power wiring 22 that is paired with the first power wiring 21. The other terminals 10A connect one first power wiring 51 to a second power wiring 52 that is paired with the first power wiring 51. The relay unit 10 has a metal housing that accommodates the plurality of terminals 10A.

[0039] [Structure of Power Wiring] In this embodiment, the distribution board 15 of the dwelling unit 3 supplies power to the electric vehicle 100 in the same way that it supplies power to the electrical equipment 16 in the dwelling unit 3. The distance from the distribution board 15 of the dwelling unit 3 to the charging / discharging station 8X is significantly larger than the distance from the distribution board 15 of the dwelling unit 3 to the electrical equipment 16 inside the dwelling unit 3. Because the distance from the distribution board 15 of the dwelling unit 3 to the charging / discharging station 8X is large, there is a large power distribution loss due to voltage drop in the power wiring 20.

[0040] Similarly, the distance from the switching device 54 in dwelling unit 3 to the charging / discharging stand 8X is significantly greater than the distance from the switching device 54 in dwelling unit 3 to the electrical equipment 16 located within dwelling unit 3. Due to the large distance from the switching device 54 in dwelling unit 3 to the charging / discharging stand 8X, there is a large power distribution loss due to voltage drop in the power wiring 50 for battery discharge.

[0041] The building structure 2 is provided with multiple dwelling units 3. In each of the multiple dwelling units 3, the distribution board 15 of the dwelling unit 3 is connected to the charging / discharging stand 8X associated with the dwelling unit 3 by power wiring 20 for battery charging. The switching device 54 of the dwelling unit 3 is connected to the charging / discharging stand 8X associated with the dwelling unit 3 by power wiring 50 for battery discharge.

[0042] The lengths of the multiple power lines 20 and 50 (hereinafter referred to as power line lengths) are different. Specifically, the lengths of the power lines 20 and 50 connecting the charging and discharging stations 8X in the multiple parking spaces 6 to the dwelling units 3 associated with the charging and discharging stations 8X are different for each dwelling unit 3. Therefore, if all of the multiple power lines 20 and 50 were made of the same type of cable with the same diameter, the power distribution loss would differ in each dwelling unit 3.

[0043] [Conduit] The conduit 30 protects the power wiring 20 and 50. The conduit 30 is configured to allow the power wiring 20 and 50 to pass through. In building 1, the power wiring 20 for battery charging and the power wiring 50 for battery discharge are individually protected by the conduit 30.

[0044] As shown in FIG. 3, the wire conduit 30 includes a first wire conduit 31 that protects the first power wirings 21 and 51, and a second wire conduit 32 that protects the second power wirings 22 and 52. The first wire conduit 31 is arranged inside the building 1 with the first power wirings 21 and 51 inserted therethrough. Preferably, in addition to the first power wirings 21 and 51, a third ground wire 25 and 65 are arranged in the first wire conduit 31. The third ground wire 25 arranged in the first wire conduit 31 for battery charging connects the ground terminal provided in the distribution board 15 and the relay unit 10. The third ground wire 65 arranged in the first wire conduit 31 for battery discharging connects the ground terminal provided in the switching device 54 and the relay unit 10.

[0045] The second wire conduit 32 is buried underground with the second power wirings 22 and 52 inserted therethrough. Preferably, in addition to the second power wirings 22 and 52, second ground wires 24 and 64 are inserted through the second wire conduit 32. The second ground wire 24 arranged in the second wire conduit 32 for battery charging connects the ground terminal provided in the charging socket 41 of the charge and discharge stand 8X and the relay unit 10. The second ground wire 64 arranged in the second wire conduit 32 for battery discharging connects the ground terminal provided in the discharging socket 42 of the charge and discharge stand 8X and the relay unit 10.

[0046] [Charge and Discharge Stand] The charge and discharge stand 8X charges the electric vehicle 100 from the residential unit 3 of the building 1 and supplies power to the residential unit 3 based on the discharge of the electric vehicle 100.

[0047] As shown in FIG. 4, the charge and discharge stand 8X includes a charging socket 41 to which the second power wiring 22 for battery charging is connected, a discharging socket 42 to which the second power wiring 52 for battery discharging is connected, and a case 44 through which two second wire conduits 32 can be inserted. The charge and discharge stand 8X further includes a base 45 that supports the case 44.

[0048] The charging socket 41 is configured such that the charging cable of the electric vehicle 100 can be connected thereto. The discharging socket 42 is configured such that the discharging cable 43 of the electric vehicle 100 can be connected thereto.

[0049] Each charging / discharging station 8X is associated with one of the multiple dwelling units 3. The charging outlet 41 of the charging / discharging station 8X is connected to the distribution board 15 of the associated dwelling unit 3 via power wiring 20 for battery charging. The discharging outlet 42 of the charging / discharging station 8X is connected to the switching device 54 of the associated dwelling unit 3 via power wiring 50 for battery discharge.

[0050] The base 45 is made of concrete. The base 45 covers the lower part of the case 44 of the charge / discharge stand 8X and the portion of the second conduit 32 that emerges from the case 44 into the ground. Crushed stone 45A is laid beneath the base 45.

[0051] The case 44 is configured to house power wiring 20 for battery charging and power wiring 50 for battery discharge. The case 44 includes a first opening 47 through which charging outlets 41 and discharge outlets 42 are provided, a second opening 48, and a third opening 49 for drawing in the second power wirings 22 and 52. The end of the second conduit 32 is housed in the case 44 through the third opening 49.

[0052] The second opening 48 is provided for connection work, such as connecting the charging outlet 41 to the second power wiring 22 for battery charging, and connecting the discharge outlet 42 to the second power wiring 52 for battery discharge. In one example, in the case 44, the second opening 48 is provided on the side opposite to the first opening 47. The second opening 48 is large enough to facilitate the connection of the wiring extending from the charging outlet 41 to the second power wiring 22 for battery charging and the wiring extending from the discharge outlet 42 to the second power wiring 52 for battery discharge. In one example, the second opening 48 is larger than the first opening 47. The second opening 48 is sealed by a cover 48A. The third opening 49 is configured to accommodate two second conduits 32. The third opening 49 is provided at the bottom of the case 44.

[0053] Case 44 is connected to the ground by a first ground wire 23. The ground terminal of the charging outlet 41 is connected to a relay unit 10 provided in the building body 2 by a second ground wire 24. The ground terminal of the discharge outlet 42 is connected to a relay unit 10 provided in the building body 2 by a second ground wire 64.

[0054] [Operation of this embodiment] If the length of the power wiring 20, 50 connecting the charging / discharging stations 8X in multiple parking spaces 6 to the dwelling units 3 associated with the charging / discharging stations 8X is large, when the electric vehicle 100 discharges to the dwelling units 3, the dwelling units 3 may not be able to receive adequate power due to power distribution losses. For example, if the power wiring 50 for battery discharge is long, the voltage of the power supplied to the electrical equipment 16 in the dwelling unit may become lower than the voltage required for the electrical equipment 16 to operate normally due to the voltage drop in the power wiring 50. In this case, there is a risk that the operation of the electrical equipment 16 may be impaired.

[0055] In this embodiment, the discharge device 111 of the electric vehicle 100 boosts the discharged power in accordance with the amount equivalent to the voltage drop rate of the power wiring 50. As a result, the discharge device 111 can supply power to the electrical equipment 16 in the dwelling unit 3 at the same voltage level as the supply voltage that was set in advance. Therefore, when power is supplied to the dwelling unit 3 by discharge from the electric vehicle 100, appropriate power can be supplied to the electrical equipment 16 in the dwelling unit 3.

[0056] [Effects of this embodiment] (1-1) The electric vehicle 100 is equipped with a discharge device 111. The discharge device 111 increases the voltage of the discharged power in accordance with the amount equivalent to the voltage drop rate of the power wiring 50 that connects the charging / discharging stand 8X to which the electric vehicle 100 is connected and the dwelling unit 3 of the building 1. With this configuration, since the power is increased in accordance with the voltage drop rate of the power wiring 50, when the electric vehicle 100 discharges to the dwelling unit 3, interference with the operation of the electrical equipment 16 in the dwelling unit 3 is suppressed.

[0057] (1-2) In the electric vehicle 100, the equivalent voltage drop rate is the voltage drop rate of the power wiring 50, or the length of the power wiring 20, 50 in each dwelling unit 3 of the building 1 when the thickness of the power wiring 50 is uniform. With this configuration, the power boost rate can be set based on the voltage drop rate or the length of the power wiring 50.

[0058] (1-3) The electric vehicle 100 is equipped with a communication unit 112. The communication unit 112 obtains an amount equivalent to the voltage drop rate from an external terminal. With this configuration, the electric vehicle 100 can obtain an amount equivalent to the voltage drop rate through communication.

[0059] <Second Embodiment> The charging and discharging stand 8X of this embodiment will be described with reference to Figure 5. In this embodiment, components common to the first embodiment are denoted by the same reference numerals as in the first embodiment, and the description of redundant components is omitted.

[0060] In the first embodiment, the discharge device 111 of the electric vehicle 100 is configured to boost the power during discharge. In contrast, in this embodiment, the discharge stand 8 boosts the power for battery discharge. In this embodiment, a charge / discharge stand 8X as an example of the discharge stand 8 will be described.

[0061] The charging / discharging stand 8X receives the discharge from the electric vehicle 100. The charging / discharging stand 8X supplies the power discharged from the electric vehicle 100 to the dwelling units 3 of the building 1. As shown in Figure 5, the charging / discharging stand 8X includes a discharge outlet 42 connected to the electric vehicle 100 via a discharge cable 43, and a boost circuit 120 that boosts the power discharged from the electric vehicle 100. The charging / discharging stand 8X further includes a memory unit 121. The memory unit 121 stores an amount equivalent to the voltage drop rate. The amount equivalent to the voltage drop rate is the same as in the first embodiment. The amount equivalent to the voltage drop rate is the voltage drop rate of the power wiring 20, 50, or the length of the power wiring 20, 50 in each dwelling unit 3 of the building 1 when the thickness of the power wiring 20, 50 is uniform.

[0062] In the charging / discharging stand 8X, the configuration is substantially the same as that of the charging / discharging stand 8X of the first embodiment, except for the boost circuit 120 and the memory unit 121. The boost circuit 120 boosts the power discharged from the electric vehicle 100 to the amount equivalent to the voltage drop rate of the power wiring 20, 50 connecting the charging / discharging stand 8X and the dwelling unit 3 of the building 1. The boost circuit 120 is composed of a converter.

[0063] [Effects of this embodiment] (2-1) The charging / discharging stand 8X is equipped with a boost circuit 120. The boost circuit 120 boosts the power to be discharged in accordance with the amount equivalent to the voltage drop rate of the power wiring 50 connecting the charging / discharging stand 8X and the dwelling unit 3 of the building 1. With this configuration, the charging / discharging stand 8X boosts the power discharged from the electric vehicle 100 in accordance with the voltage drop rate of the power wiring 50. Therefore, when the charging / discharging stand 8X supplies power to the dwelling unit 3 based on the discharge of the electric vehicle 100, interference with the operation of the electrical equipment 16 in the dwelling unit 3 is suppressed.

[0064] (2-2) In the charging / discharging station 8X, the equivalent voltage drop rate is the voltage drop rate of the power wiring 50, or the length of the power wiring 50 when the thickness of the power wiring 20, 50 in each dwelling unit 3 of the building 1 is uniform. With this configuration, the power boost rate can be set based on the voltage drop rate or the length of the power wiring 50.

[0065] (2-3) The charging / discharging stand 8X is equipped with a memory unit 121. The memory unit 121 stores an amount equivalent to the voltage drop rate. With this configuration, the boost circuit 120 can set the boost rate based on the amount equivalent to the voltage drop rate stored in the memory unit 121.

[0066] <Modifications> The above embodiment is an example of possible forms of the electric vehicle 100 and the discharge stand 8, and is not intended to limit their forms. The electric vehicle 100 and the discharge stand 8 may take forms different from those exemplified in the above embodiment. Examples include forms in which some of the configurations of the embodiment are replaced, modified, or omitted, or forms in which new configurations are added to the embodiment. Modifications of the embodiment are shown below.

[0067] In the first embodiment, a charging / discharging stand 8X is provided for each parking space 6. In contrast, in the modified example, a charging / discharging stand 8X may be provided for several predetermined locations of a plurality of parking spaces 6. For example, in a parking lot 5, one multi-charging / discharging stand may be provided for two adjacent parking spaces 6. The multi-charging / discharging stand includes two charging / discharging stands 8X. The multi-charging / discharging stand can be considered as two charging / discharging stands 8X integrated into one unit. One dwelling unit 3 is associated one-to-one with one of the charging / discharging stands 8X within the multi-charging / discharging stand. Another dwelling unit 3 is associated one-to-one with the other charging / discharging stand 8X within the multi-charging / discharging stand.

[0068] In this case, the multi-charge / discharge station has two charging outlets 41 and two discharging outlets 42. The multi-charge / discharge station is installed between two parking spaces 6. The multi-charge / discharge station can charge two electric vehicles 100 simultaneously. The charge / discharge station 8X can receive discharges from two electric vehicles 100 simultaneously.

[0069] In the second embodiment, the memory unit 121 may be omitted. In this case, the boost circuit 120 is configured to include an analog circuit or ASIC circuit that boosts the voltage according to the amount equivalent to the voltage drop rate.

[0070] In the first embodiment, building 1 is an apartment building. The dwelling unit 3 and the charging / discharging stand 8X, which serves as a discharge stand 8, are connected by power wiring 20 and 50. Alternatively, the shops within building 1 and the charging / discharging stand 8X, which serves as a discharge stand 8, may also be connected by power wiring 20 and 50. In this case, the discharge device 111 of the electric vehicle 100 in the first embodiment boosts the power to be discharged according to the amount equivalent to the voltage drop rate of the power wiring 50 connecting the charging / discharging stand 8X to which the electric vehicle 100 is connected and the shops in building 1. With this configuration, when the electric vehicle 100 discharges to the shops, interference with the operation of the shops' electrical equipment 16 is suppressed.

[0071] In the second embodiment, building 1 is an apartment building. The dwelling unit 3 and the charge / discharge stand 8X, which serves as the discharge stand 8, are connected by power wiring 20 and 50. Alternatively, the shops within building 1 and the charge / discharge stand 8X, which serves as the discharge stand 8, may also be connected by power wiring 20 and 50. In this case, the boost circuit 120 of the charge / discharge stand 8X, which serves as the discharge stand 8 in the second embodiment, boosts the power to be discharged according to the amount equivalent to the voltage drop rate of the power wiring 50 connecting the charge / discharge stand 8X and the shops within building 1. With this configuration, when the charge / discharge stand 8X supplies power to the shops based on the discharge of the electric vehicle 100, interference with the operation of the shops' electrical equipment 16 is suppressed.

[0072] This specification discloses the following technology: [Appendix 1] Appendix 1 is an electric vehicle. The electric vehicle comprises a battery and a discharge device for discharging power from the battery. The discharge device increases the voltage of the power to be discharged in accordance with the amount equivalent to the voltage drop rate of the power wiring connecting the discharge station to which the electric vehicle is connected and the individual compartment of the building.

[0073] [Note 2] In the electric vehicle described in Note 1, the amount equivalent to the voltage drop rate is the voltage drop rate of the power wiring, or the length of the power wiring when the thickness of the power wiring in each individual section of the building is uniform.

[0074] [Note 3] The electric vehicle described in Note 1 or 2 further comprises a communication unit. The communication unit obtains the voltage drop rate equivalent amount from an external terminal.

[0075] [Note 4] In the electric vehicle described in Note 1 or 2, the individual compartment is either a dwelling unit or a shop.

[0076] [Note 5] Note 5 is a discharge stand for discharging power from an electric vehicle to individual compartments of a building. The discharge stand comprises a discharge outlet connected to the electric vehicle via a discharge cable, and a boost circuit for boosting the power discharged from the electric vehicle. The boost circuit boosts the power to be discharged in accordance with the amount equivalent to the voltage drop rate of the power wiring connecting the discharge stand and the individual compartments of the building.

[0077] [Note 6] In the discharge stand described in Note 5, the amount equivalent to the voltage drop rate is the voltage drop rate of the power wiring, or the length of the power wiring when the thickness of the power wiring in each individual section of the building is uniform.

[0078] [Note 7] The discharge stand described in Note 5 or 6 further comprises a memory unit. The memory unit stores the amount equivalent to the voltage drop rate.

[0079] [Note 8] In the discharge stand described in Note 5 or 6, the individual compartment is a dwelling unit or a shop.

[0080] 1...Building, 1A...Individual section, 3...Dwelling unit, 8...Discharge stand, 20...Power wiring, 42...Discharge outlet, 43...Discharge cable, 50...Power wiring, 100...Electric vehicle, 110...Battery, 111...Discharge device, 112...Communication unit, 120...Boost circuit, 121...Storage unit.

Claims

1. An electric vehicle comprising a battery and a discharge device for discharging power from the battery, wherein the discharge device increases the voltage of the power to be discharged in accordance with the amount equivalent to the voltage drop rate of the power wiring connecting the discharge station to which the electric vehicle is connected and the individual section of the building.

2. The amount equivalent to the voltage drop rate is the voltage drop rate of the power wiring, or the length of the power wiring when the thickness of the power wiring in each individual section of the building is uniform, as described in claim 1.

3. The electric vehicle according to claim 1 or 2, further comprising a communication unit, wherein the communication unit obtains the amount equivalent to the voltage drop rate from an external terminal.

4. The electric vehicle according to any one of claims 1 to 3, wherein the individual compartment is a dwelling unit or a shop.

5. A discharge stand for discharging power from an electric vehicle to individual compartments of a building, comprising: a discharge outlet connected to the electric vehicle via a discharge cable; and a boost circuit for boosting the power discharged from the electric vehicle, wherein the boost circuit boosts the power to be discharged in proportion to the amount equivalent to the voltage drop rate of the power wiring connecting the discharge stand and the individual compartments of the building.

6. The discharge stand according to claim 5, wherein the amount equivalent to the voltage drop rate is the voltage drop rate of the power wiring, or the length of the power wiring when the thickness of the power wiring in each individual section of the building is uniform.

7. The discharge stand according to claim 5 or 6, further comprising a memory unit which stores an amount equivalent to the voltage drop rate.

8. The discharge stand according to any one of claims 5 to 7, wherein the individual compartment is a dwelling unit or a shop.

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