US 2025/0326316 A1Published application

Measuring battery capacity of a battery installed on a vehicle through vehicle-to-grid (v2g) discharge and charge cycling operation

AssigneeVolvo Truck Corporation

InventorsSimon Brunet, Tommy Hjelle

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Abstract

Aspects disclosed herein involve measuring battery capacity of a battery installed on a vehicle through a vehicle-to-grid (V2G) discharge and charge cycling operation. The EV is configured to perform the discharge/charge cycle in the discharge/charge operational mode cooperatively through a power connection to a charging station configured to operate in a V2G mode to determine battery capacity. The charging station is not only controllable by the EV to charge its battery from grid power, but the charging station is also controllable by the EV to discharge energy from its battery back to the grid in a V2G operation. The EV can disable on-board, non-essential power consuming devices before starting the discharge cycle so that measured discharge energy can be controlled to be as steady state as possible to allow a more accurate measurement of the discharge energy from the battery.

Claims19

Dependent claims

A computer system comprising processing circuitry configured to:

receive a request for a vehicle to enter a discharge/charge operational mode while a vehicle charging port of the vehicle is coupled to an external charging station configured to operate in a vehicle-to-grid (V2G) mode;
and
in response to the request for the vehicle to enter the discharge/charge operational mode:
deactivate power consuming devices in the vehicle not essential to the vehicle operating in the discharge/charge operational mode;
communicate a first discharge request to the external charging station to discharge energy from a battery in the vehicle to a power grid coupled to the external charging station at a first higher steady state current in a discharge mode;
detect an overall voltage of the battery at the first predetermined lower voltage in the discharge mode;
and
in response to detecting the overall voltage of the battery at the first predetermined lower voltage in the discharge mode:
communicate a second discharge request to the external charging station to discharge energy from the battery in the vehicle to the power grid at a first lower steady state current lower than the first higher steady state current in the discharge mode;
detect a voltage of cells of the battery at the first predetermined lower voltage in the discharge mode;
and
in response to detecting the voltage of the cells of the battery at the first predetermined lower voltage in the discharge mode:
communicate the charge request to the external charging station to deliver the charge energy to the battery from the power grid at the second steady state current in the charge mode;
and
measure the discharged energy from the battery in the discharge mode;
detect the battery at a first predetermined lower voltage in the discharge mode;
and
in response to detecting the battery at the first predetermined lower voltage in the discharge mode:
communicate a charge request to the external charging station to deliver charge energy to the battery from the power grid at a second steady state current in a charge mode;
and
measure the charge energy delivered to the battery in the charge mode;
detect when the battery is at a second predetermined higher voltage in the charge mode;
and
in response to detecting the battery is at the second predetermined higher voltage in the charge mode:
disable the discharge/charge operational mode.

22 more elements

A computer-implemented method, comprising:

receiving, by processing circuitry of a computer system, a request for a vehicle to enter a discharge/charge operational mode while a vehicle charging port of the vehicle is coupled to an external charging station configured to operate in a vehicle-to-grid (V2G) mode;
and
in response to the request for the vehicle to enter the discharge/charge operational mode:
deactivating, by the processing circuitry of the computer system, power consuming devices in the vehicle not essential to the vehicle operating in the discharge/charge operational mode;
communicating, by the processing circuitry of the computer system, a first discharge request to the external charging station to discharge energy from a battery in the vehicle to a power grid coupled to the external charging station at a first higher steady state current in a discharge mode;
detecting an overall voltage of the battery at the first predetermined lower voltage in the discharge mode;
and
in response to detecting the overall voltage of the battery at the first predetermined lower voltage in the discharge mode:
communicating a second discharge request to the external charging station to discharge energy from the battery in the vehicle to the power grid at a first lower steady state current lower than the first higher steady state current in the discharge mode;
detecting a voltage of cells of the battery at the first predetermined lower voltage in the discharge mode;
and
in response to detecting the voltage of the cells of the battery at the first predetermined lower voltage in the discharge mode:
communicating the charge request to the external charging station to deliver the charge energy to the battery from the power grid at the second steady state current in the charge mode;
and measuring, by the processing circuitry of the computer system, the discharged energy from the battery in the discharge mode;
detecting, by the processing circuitry of the computer system, the battery at a first predetermined lower voltage in the discharge mode;
and
in response to detecting the battery at the first predetermined lower voltage in the discharge mode:
communicating, by the processing circuitry of the computer system, a charge request to the external charging station to deliver charge energy to the battery from the power grid at a second steady state current in a charge mode;
measuring, by the processing circuitry of the computer system, the charge energy delivered to the battery in the charge mode;
detecting when the battery is at a second predetermined higher voltage in the charge mode;
and
in response to detecting the battery is at the second predetermined higher voltage in the charge mode:
disabling the discharge/charge operational mode.

20 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/085,034Filed 20 Mar 2025
Priority: EP 24170768.617 Apr 2024
Published: 23 Oct 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification27 codes

B60L 53/60
Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of…:…
B60L 53/62
Monitoring or controlling charging stations: in response to charging parameters, e.g. current, voltage or electrical charge
B60L 53/63
Monitoring or controlling charging stations: in response to network capacity
B60L 53/64
Monitoring or controlling charging stations: optimising energy costs, e.g. responding to electricity rates

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