EV Charging Cross-Certification for Multi-Operator Plug-and-Charge
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Solution Overview
Problem
The existing electric vehicle charging system faces challenges in authenticating vehicles when there are multiple mobility operators (MOs) due to the lack of MO RootCA certificates in charging stations, leading to situations where stations cannot provide services to some electric vehicles.
Innovation Solution
The proposed solution involves a cross-certification method where the charging station verifies the contract certificate of an electric vehicle using a cross certificate based on a predetermined RootCA certificate, allowing verification without the need for an MO RootCA certificate, and enables plug-and-charge charging even with multiple MOs, reducing the memory burden on both stations and vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the charging station uses traditional PKI-based authentication with MO RootCA certificates, then authentication security is maintained, but the system cannot serve vehicles from multiple mobility operators due to missing RootCA certificates
Solution Approach 1:
The patent introduces a V2G RootCA as an intermediary that issues cross-certificates for multiple MO RootCAs. The charging station only needs to store the single V2G RootCA certificate, which acts as a mediator to verify contract certificates from any MO through the cross-certificate chain, eliminating the need to store multiple MO RootCA certificates while maintaining authentication security across multiple operators
Solution Approach 2:
The V2G RootCA certificate serves multiple functions: it acts as a trust anchor for the charging station, issues cross-certificates for numerous different MO RootCAs, and enables universal authentication across all mobility operators. This single certificate performs the work of what would otherwise require multiple separate RootCA certificates, achieving multi-operator compatibility without proportionally increasing storage requirements
2Adaptability or versatility
If the charging station stores all MO RootCA certificates to verify contract certificates, then authentication for all operators is enabled, but memory burden increases significantly
Solution Approach 1:
The V2G RootCA serves as a mediating trust authority that enables the charging station to verify any MO's contract certificate without directly storing that MO's RootCA. The station stores only the V2G RootCA and uses it to validate the cross-certificate chain, dramatically reducing memory requirements while maintaining the ability to authenticate vehicles from any mobility operator
Solution Approach 2:
Instead of storing actual copies of multiple MO RootCA certificates in the charging station, the system uses a reference approach where the V2G RootCA references or issues cross-certificates that represent multiple MO RootCAs. This virtual copying mechanism allows verification of any MO certificate without physically storing multiple certificate copies, reducing memory burden while preserving authentication capability
Data Source
AI summary
An authentication method and device enable a charging station to verify a contract certificate of an electric vehicle based on a cross certificate when the charging station is not equipped with an MO RootCA certificate. An electric vehicle authentication method for providing plug-and-charge charging to the electric vehicle in the charging station includes: transmitting, to the electric vehicle, an SECC certificate chain including an SECC certificate and at least one charging device family SubCA certificate and receiving a verification result for the SECC certificate from the electric vehicle; receiving a contract certificate chain including a contract certificate from the electric vehicle; and verifying the cross certificate based on a predetermined RootCA certificate to obtain a public key of a charging operator RootCA or a charging operator SubCA included in the cross certificate and verifying the contract certificate based on an obtained public key.