GB/T 29318-2024 Electric energy metering for off-board charger of electric vehicle
1 Scope
This document specifies the technical requirements, test methods and inspection rules for the DC electric energy metering part between the off-board charger of electric vehicles and the electric vehicles.
This document is applicable to the design, manufacture, acceptance and use of the electric energy metering part of the whole public off-board charger (hereinafter referred to as the "charger"). It may serve as a reference for other types of chargers.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2423.1 Environmental testing for electric and electronic products - Part 2: Test methods - Tests A: Cold
GB/T 2423.2 Environmental testing for electric and electronic products - Part 2: Test methods - Tests B: Dry heat
GB/T 2423.4 Environmental testing for electric and electronic products - Part 2: Test method - Test Db: Damp heat, cyclic (12h+12h cycle)
GB/T 18487.1-2023 Electric vehicle conductive charging system - Part 1: General requirements
GB/T 18487.2-2017 Electric vehicle conductive charging system - Part 2: EMC requirements for off-board electric vehicle supply equipment
GB/T 29317 Terminology of electric vehicle charging/battery swap infrastructure
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 29317 and the following apply.
3.1
public off-board charger
off-board chargers used to provide public services and carry out electric energy transactions
3.2
total charging energy
total charging electric energy from the first charge recorded by the charger under the working state
3.3
rate amount
amount obtained by multiplying the electric energy output by the charger in the corresponding period of time under the working state by the rate
3.4
additional amount
expenses other than the rate amount recorded by the charger under the working state
Note: such as parking fees, etc.
3.5
billable amount
sum of the rate amount and the additional amount recorded by the charger under the working state, which is used for settlement with the user
3.6
total billable amount
sum of the billable amount from the first charge recorded by the charger under the working state
3.7
measuring module
electric energy meter installed inside the charger for electric energy metering and external matching sensor device or integrated electric energy metering device with sensor device
3.8
maximum voltage
Umax
maximum voltage value of the rated working output of the charger and capable of measuring electric energy
3.9
minimum voltage
Umin
minimum voltage value of the rated working output of the charger and capable of measuring electric energy
3.10
maximum current
maximum current value of the rated working output of the charger and capable of measuring electric energy
3.11
minimum current
minimum current value of the rated working output of the charger and capable of measuring electric energy
4 Technical requirements
4.1 Interface for metering
The interface for electric energy metering of the charger shall meet the following requirements:
a) It shall have an interface for DC energy transmission with the power battery of the electric vehicle;
b) It should have an electric energy pulse output interface for measuring errors, which can be directly output through the charger;
c) It shall have a communication interface for transmitting electric energy and electricity bill information;
d) It should have strong and weak current interfaces suitable for virtual load detection.
4.2 Function
4.2.1 Metering function
The charger has the following functions:
a) It shall have the function of metering electric energy in different periods;
b) It should have the function of metering bidirectional electric energy.
4.2.2 Billing function
The charger shall have the function of calculating the billable amount based on time, electric energy, rate, etc.
Contents Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Technical requirements 5 Test methods 6 Inspection rules Annex A (Informative) Schematic diagram for calibration method Annex B (Normative) Test items
