# US 11,897,359 B2 · Electric power system and electric power calculation method

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- Number: US 11,897,359 B2
- Document ID: US11897359B2
- Status: Granted
- Kind: B2
- Application number: 17/814,733
- Filed: 2022-07-25
- Published: 2023-02-02
- Granted: 2024-02-13
- Earliest claimed: 2021-07-29
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Shigeki Kinomura
- Web page: https://patentgrep.com/patent/US11897359B2

## CPC

- B60L 53/665: {Methods related to measuring, billing or payment}
- B60L 3/12: Recording operating variables {; Monitoring of operating variables}
- B60L 53/14: Conductive energy transfer
- B60L 53/20: characterised by converters located in the vehicle
- B60L 53/68: Off-site monitoring or control, e.g. remote control
- B60L 55/00: Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
- H02J 3/322: {the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging}
- H02J 7/02: for charging batteries from AC mains by converters
- H02J 7/865: {Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence)}
- B60L 2210/30: AC to DC converters
- B60L 2210/40: DC to AC converters
- H02J 2207/20: Charging or discharging characterised by the power electronics converter
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y02T 90/12: Electric charging stations
- Y02T 90/16: Information or communication technologies improving the operation of electric vehicles
- Y02T 90/167: Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An electric power system includes a vehicle, a vehicle management server, an AC charging stand, a DC charging stand, and a charging stand management server. During AC charging and AC discharging, the AC charging stand is connected to the vehicle. An amount of charging power during AC charging and an amount of discharging power during AC discharging are calculated by the vehicle. The vehicle measures electric power before power conversion by an on-board charger, and calculates an amount of charging power and an amount of discharging power. An amount of charging power during DC charging and an amount of discharging power during DC discharging are calculated by the DC charging stand. The DC charging stand measures electric power before power conversion by a charger, and calculates an amount of charging power and an amount of discharging power.

## Claims

### Claim 1

An electric power system comprising:
a vehicle that performs
external charging of charging a battery with electric power supplied from outside the vehicle, and
external discharging of supplying electric power of the battery to outside the vehicle;
a charging stand that transfers electric power between an AC power supply outside the vehicle and the vehicle in the external charging and the external discharging; and
a server that communicates with the vehicle and the charging stand, wherein
in the external charging and the external discharging, when electric power transferred between the vehicle and the charging stand is AC power,
the vehicle includes
a first charger that converts AC power supplied from the charging stand into DC power and converts DC power supplied from the battery into AC power, and
a first detector that detects electric power input to and output from the first charger, and
the vehicle measures charging power supplied from the charging stand or discharging power supplied to the charging stand using a detection value of the first detector, and transmits, to the server, a first measurement value that is a result of the measurement, and
in the external charging and the external discharging, when the electric power transferred between the vehicle and the charging stand is DC power,
the charging stand includes
a second charger that converts AC power supplied from the AC power supply into DC power and converts DC power supplied from the vehicle into AC power, and
a second detector that detects electric power input to and output from the second charger, and
the charging stand measures charging power supplied to the vehicle or discharging power supplied from the vehicle using a detection value of the second detector, and transmits, to the server, a second measurement value that is a result of the measurement.

### Claim 2 (depends on 1)

The electric power system according to claim 1, wherein
the vehicle and the charging stand are configured to communicate with each other,
the charging stand is configured to transmit the second measurement value to the vehicle, and
the vehicle is configured to transmit the second measurement value to the server.

### Claim 3 (depends on 2)

The electric power system according to claim 2, wherein when the charging stand fails to communicate with the server, the charging stand transmits the second measurement value to the vehicle.

### Claim 4 (depends on 1)

The electric power system according to claim 1, wherein
the vehicle and the charging stand are configured to communicate with each other,
the vehicle is configured to transmit the first measurement value to the charging stand, and
the charging stand is configured to transmit the first measurement value to the server.

### Claim 5 (depends on 4)

The electric power system according to claim 4, wherein when the vehicle fails to communicate with the server, the vehicle transmits the first measurement value to the charging stand.

### Claim 6 (depends on 1)

The electric power system according to claim 1, wherein
the server includes
a first server that manages the vehicle, and
a second server that manages the charging stand,
the first server and the second server are configured to communicate with each other,
the vehicle transmits the first measurement value to the first server,
the charging stand transmits the second measurement value to the second server, and
the first server and the second server share the first measurement value and the second measurement value.

### Claim 7

An electric power calculation method of calculating, in an electric power system including a vehicle, a charging stand, and a server, an amount of electric power transferred by the vehicle,
the vehicle being configured to perform
external charging of charging a battery with electric power supplied from outside the vehicle, and
external discharging of supplying electric power of the battery to outside the vehicle,
the charging stand being configured to transfer electric power between an AC power supply outside the vehicle and the vehicle in the external charging and the external discharging,
the server being configured to communicate with the vehicle and the charging stand,
in the external charging and the external discharging, when electric power transferred between the vehicle and the charging stand is AC power, the vehicle including
a first charger that converts AC power supplied from the charging stand into DC power and converts DC power supplied from the battery into AC power, and
a first detector that detects electric power input to and output from the first charger,
the electric power calculation method comprising:
measuring, by the vehicle, charging power supplied from the charging stand or discharging power supplied to the charging stand using a detection value of the first detector; and
transmitting, by the vehicle to the server, a first measurement value that is a result of the measurement, and
in the external charging and the external discharging, when electric power transferred between the vehicle and the charging stand is DC power,
the charging stand including
a second charger that converts AC power supplied from the AC power supply into DC power and converts DC power supplied from the vehicle into AC power, and
a second detector that detects electric power input to and output from the second charger, and
the electric power calculation method further comprising:
measuring, by the charging stand, charging power supplied to the vehicle or discharging power supplied from the vehicle using a detection value of the second detector; and
transmitting, by the charging stand to the server, a second measurement value that is a result of the measurement.

### Claim 8

An electric power system comprising:
a vehicle that performs
external charging of charging a battery with electric power supplied from outside the vehicle, and
external discharging of supplying electric power of the battery to outside the vehicle,
a charging stand that transfers electric power between an AC power supply outside the vehicle and the vehicle in the external charging and the external discharging; and
a server that communicates with the charging stand, wherein
in the external charging and the external discharging, when electric power transferred between the vehicle and the charging stand is AC power,
the charging stand includes a first detector that detects charging power supplied to the vehicle and discharging power supplied from the vehicle, and
the charging stand measures the charging power or the discharging power using a detection value of the first detector, and transmits, to the server, a first measurement value that is a result of the measurement, and
in the external charging and the external discharging, when the electric power transferred between the vehicle and the charging stand is DC power,
the charging stand includes
a charger that converts AC power supplied from the AC power supply into DC power and converts DC power supplied from the vehicle into AC power, and
a second detector that detects electric power input to and output from the charger, and
the charging stand measures charging power supplied to the vehicle or discharging power supplied from the vehicle using a detection value of the second detector, and transmits, to the server, a second measurement value that is a result of the measurement.