Battery Module Authentication via Additional Information Carrier
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Solution Overview
Problem
Existing battery management systems lack effective methods to authenticate measurement data and prevent manipulation or unauthorized replacement of battery modules, which can lead to safety and reliability issues in electric vehicles.
Innovation Solution
A method involving module controllers capturing measurement data, generating an additional information carrier such as a checksum or one-way function using a unique key, and transmitting it to a central controller for validation, ensuring data integrity and authenticity, while also enabling detection of potential tampering or faulty modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement data are transmitted without authentication, then data transmission is simple and fast, but data integrity and authenticity cannot be ensured
Solution Approach 1:
The patent applies preliminary action by generating and transmitting an additional information carrier (authentication data) together with the measurement data before any potential manipulation can occur. The module controller calculates this authentication carrier using a one-way function with a secret key stored in non-volatile memory, ensuring the data are authenticated in advance during the capture phase, rather than requiring complex verification after transmission.
Solution Approach 2:
The patent uses an intermediary approach by introducing an additional information carrier (authentication data) that mediates between the measurement data and the central controller. This carrier acts as a proof of authenticity that the central controller can verify without needing complex cryptographic protocols, simplifying the overall system while ensuring data integrity through the intermediary authentication element.
2Reliability
If complex authentication methods are used, then data security is improved, but processing time and computational load increase
Solution Approach 1:
The patent applies the principle of using simple, disposable authentication elements by employing a one-way function to generate an additional information carrier that is easily calculated and verified. This authentication carrier can be quickly generated from the measurement data and a secret key, and verified by the central controller without requiring complex computational resources or extended processing time, making the authentication process efficient and lightweight.
Solution Approach 2:
The patent replaces complex cryptographic mechanical systems with a simpler mathematical approach using one-way functions. Instead of implementing complex mutual authentication protocols or hardware-based security modules, the system substitutes these with a straightforward calculation of an additional information carrier using a one-way function, which can be processed quickly by both the module controller and central controller with minimal computational overhead.
3Reliability
If authentication mechanisms are implemented, then unauthorized replacement is prevented, but system complexity and data volume increase
Solution Approach 1:
The patent extracts only the essential authentication information into a separate additional information carrier, rather than transmitting or storing entire authentication protocols or large cryptographic keys. By calculating this carrier using a one-way function on the measurement data combined with a secret key, the system extracts minimal authentication proof that can be transmitted and stored efficiently, keeping the additional data volume small while maintaining strong authorization verification capabilities.
Data Source
AI summary
A method for authenticating measurement data for a battery that comprises at least one battery module, having an associated module controller, and a central controller has the following steps: capture of measurement data from battery units by the module controller; ascertainment of at least one additional information carrier, which is set up to authenticate the measurement data, by the module controller; transmission of the measurement data and of the additional information carrier from the module controller to the central controller; and validation of the measurement data by the central controller using the additional information carrier. Furthermore, a data structure, a computer program and a battery management system are specified that are set up to perform the method, and also a battery and a motor vehicle, the drive system of which is connected to a battery of this kind.