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A system and apparatus for energy consumption measurement of electric vehicle charging

IP.com Disclosure Number: IPCOM000248592D
Publication Date: 2016-Dec-20
Document File: 3 page(s) / 68K

Publishing Venue

The IP.com Prior Art Database

Abstract

Measurement of the energy consumption for charging an electric vehicles (EV), such as battery electric vehicles (BEV) or plug-in-hybrid electric vehicles (PHEV) at public charging stations requires a digital energy-meter installed in each charging station to measure the energy consumed for charging. The system and apparatus described here utilizes an alternative method to measure the energy consumption using the EV build-in Battery-Management System (BMS). At the end of the charging process the digital value of the energy consumed and charged is made available by the Vehicle Manufactures IT system to Charge-Point Operators (CPOs) or other actors authorized by the EV driver to use this data for billing or payment purpose.

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A system and apparatus for energy consumption measurement of electric vehicle charging

1) Drawback of todays technical solutions

Measurement of energy consumption for charging of electric vehicles, such as “battery electric vehicles (BEV)” or “plug-in-hybrid electric vehicles (PHEV)” at public charging stations requires a digital energy-meter installed in each charging station to measure the energy consumed for charging. Once the charging process has been completed the digital value of the consumed energy is used for calculating of the payment or billing of the total energy used.

The main problem with this approach using the charging station to measure the energy-consumed while charging requires an extra digital energy meter to be installed in each charging station or charging point. In addition there are on-going operations costs for maintaining the digital energy meter. The digital energy-meter needs to be exchanged from time to time in order to be compliant with national energy measurement regulations. Such digital energy-meters need to be designed and build to operate in extended temperature ranges which increases the cost of charge points as well.

Another approach for calculating the cost of charging an EV is without any measurement equipment (no digital energy meter). The total price for charging is based on the time-measurement of the total elapsed time from start-of-charge to end-of-charge. This approach is highly unprecise and unfair for end-users of EVs which consume less energy during charge time.

Both methods and approaches have drawbacks on cost or are unprecise to calculate the price per kWh for charging. As the cost for charging-infrastructure equipment is quite high technical solutions are necessary to reduce the costs of charging infrastructure equipment. Therefore, any technical solution reducing the costs of charging equipment are highly desired from an overall infrastructure costs point of view.

2) Overview of new technical solution

The system and apparatus described here does solve both drawbacks of todays implemented charging systems in-operation and in-use.

The idea is to utilize telematics-control-units (TCU)s with the battery-management-systems (BMS)s available in todays EVs available on the market. Those EVs are all digitally connected to vehicle-manufactures (VM) connected-car system for monitoring and controlling purposes.

When the charging process has been authenticated and started at the charging station, a communication link will be established to the VM system to start the measurement of the energy-consumption using the BMS of the EV. Once the charging process has ended, the total energy-consumption will be electronically read from the BMS of the EV by leveraging the communication link of the VM connected car system.

This system and apparatus does not require any additional digital energy meter and is more accurate than the time-measurement while charging. It leverages existing communication link between the...