Redundant Battery Sampling Multiplexers for Fault Data Detection
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Solution Overview
Problem
Current battery sampling chips, such as analog front end (AFE) sampling chips, have low reliability, leading to invalid data collection that cannot be timely identified, posing a safety risk to battery management systems in devices like new energy vehicles and drones.
Innovation Solution
A battery sampling chip with a selector module featuring redundant multiplexers and analog-to-digital converters of different precision, along with a data control module, to detect and prevent the output of incorrect data by identifying inconsistencies and anomalies, ensuring accurate data conversion and alarm triggering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single multiplexer is used to collect status data, then the device complexity is low, but the reliability is insufficient because failure cannot be detected
Solution Approach 1:
The patent applies local quality by implementing redundancy specifically in the selector module where failure detection is most critical. Two multiplexers are configured to collect status data from the same battery cells, creating a localized redundant structure that enhances reliability at the data collection point without requiring redundancy throughout the entire battery management system.
Solution Approach 2:
The patent implements beforehand cushioning by pre-configuring dual multiplexers and comparison logic that can detect failures before they affect system operation. The comparison mechanism is established in advance, allowing the system to identify and flag faulty data collection before incorrect data is processed or acted upon, providing a safety buffer against reliability issues.
2Measurement precision
If data from multiple multiplexers is compared, then measurement precision of data validity is improved, but the device complexity increases due to additional comparison logic
Solution Approach 1:
The patent applies feedback by creating a closed-loop comparison mechanism where data from multiple multiplexers is continuously compared and the results feed back into the system's decision-making process. The comparison logic provides immediate feedback on data consistency, allowing the system to identify and exclude faulty data sources in real-time, thereby improving measurement precision of data validity.
Solution Approach 2:
The system implements self-service through automated comparison and validation logic that independently assesses data quality without requiring external intervention. The dual multiplexer configuration with built-in comparison capability allows the system to self-diagnose data collection issues, reducing the need for complex external monitoring and validation systems.
3Reliability
If redundant multiplexers are deployed, then reliability is improved through failure detection, but the use of energy increases due to additional components
Solution Approach 1:
The patent applies partial or excessive action by implementing redundancy only for the multiplexer functions rather than duplicating the entire battery management system. The dual multiplexer configuration provides sufficient reliability improvement for data collection without the excessive energy consumption that would result from full system redundancy, achieving an optimal balance between reliability enhancement and energy usage.
Data Source
AI summary
A battery sampling chip and a battery management system. The battery sampling chip includes a selector module, including a first multiplexer and a second multiplexer, wherein the first multiplexer and the second multiplexer are both used to collect status data of a first group of cells; an analog-to-digital conversion module, connected with the first multiplexer and the second multiplexer; and a data control module, used to send alarm information when converted status data sent by the analog-to-digital conversion module are not received within a preset duration. Through redundancy design of the multiplexers, whether the selector module fails or is abnormal can be effectively judged, thus avoiding the battery management system including the battery sampling chip from monitoring incorrect status data.