Wireless Battery Management Integrity Checks for Functional Safety
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Solution Overview
Problem
Conventional wired battery management systems face issues of lack of flexibility in pack design, wasted space due to connectors and cabling, and increased challenges for battery second life usage, while wireless systems are vulnerable to interference and cyber-attacks.
Innovation Solution
A battery management system utilizing module monitoring systems that encode integrity data with battery sensor data for transmission over a wireless black communication channel to a wireless network controller, ensuring data integrity and security through error detection codes and message authentication, thereby reducing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wired battery management systems are used, then data transmission reliability is improved, but device complexity and space consumption increase due to connectors and cabling
Solution Approach 1:
The patent replaces the mechanical wired connection system with a wireless communication system. Module monitoring systems transmit battery sensor data wirelessly to the wireless network controller, eliminating physical connectors and cabling while maintaining data transmission functionality. This substitution reduces device complexity and space consumption without completely sacrificing reliability, as integrity data mechanisms are implemented to ensure secure wireless transmission.
2Device complexity
If wireless battery management systems are used, then device complexity is reduced, but security and data integrity deteriorate due to vulnerability to interference and cyber-attacks
Solution Approach 1:
The patent implements preliminary actions to ensure security and data integrity before data transmission occurs. Integrity data including error detection codes and message authentication codes are generated and attached to battery sensor data prior to wireless transmission. This preliminary encoding prepares the data for secure transmission, enabling the receiver to verify authenticity and detect corruption before processing the information.
Solution Approach 2:
The patent implements feedback mechanisms where the wireless network controller validates received battery sensor data based on the attached integrity data. Error detection codes verify data completeness, and message authentication codes confirm data origin authenticity. This feedback validation process ensures that only verified, uncorrupted data from legitimate sources is accepted, maintaining security and reliability in the wireless system.
3Reliability
If integrity data encoding is implemented, then data security is improved, but manufacturing cost increases
Solution Approach 1:
The patent implements integrity data encoding by adding data parameters (error detection codes and message authentication codes) to the battery sensor data. These additional parameters increase data size slightly but provide essential security and verification functionality. The approach balances enhanced data security with acceptable manufacturing cost increases, as the encoding processes use standard computational algorithms rather than requiring expensive specialized hardware.
Data Source
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AI summary
In a particular embodiment, a method of functional safety in a battery management system is disclosed that includes: generating, by a module monitoring system of the battery management system, battery sensor data; generating, by the module monitoring system, based on the battery sensor data, integrity data; sending, by the module monitoring system, via a wireless black communication channel to a wireless network controller of the battery management system, the battery sensor data and the integrity data; and sending, by the wireless network controller, to a vehicle control system, the battery sensor data.