Integrated Data Acquisition Device for Battery Fault Detection
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Solution Overview
Problem
Current battery monitoring systems in electric vehicles face challenges in detecting faults within the monitoring devices themselves, leading to potential dangerous conditions due to the lack of redundancy, increased cost, and system complexity, while also failing to identify the type and severity of faults.
Innovation Solution
An integrated standard-compliant data acquisition device with multiplexers, an analog-to-digital converter, registers, and communication circuitry is used to detect and rank faults by comparing circuit values under different conditions, allowing for internal fault detection and cell balancing, reducing the need for multiple redundant devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple redundant monitoring devices are used to detect faults, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple monitoring functions and redundancy mechanisms into a single integrated data acquisition device. The device includes multiple input channels that can monitor different battery cells or modules, internal self-diagnostics to detect faults within itself, and fault ranking capabilities all in one unit, eliminating the need for multiple separate redundant devices while maintaining reliability
Solution Approach 2:
The monitoring device incorporates self-diagnostics to detect faults within itself. The device can identify when its own measurement circuits, ADC, or other internal components fail, allowing it to detect its own failures without requiring external redundant monitoring systems, thereby reducing overall system complexity
2Reliability
If multiple redundant monitoring devices are used to detect faults, then reliability is improved, but cost increases
Solution Approach 1:
The patent consolidates multiple monitoring functions into a single device that can monitor multiple battery cells or modules simultaneously through its multiple input channels. This eliminates the need for separate redundant devices for each cell or module, reducing the total number of devices required while maintaining comprehensive monitoring coverage
Solution Approach 2:
The data acquisition device is designed with universal functionality to monitor multiple battery cells or modules through its multiple input channels, perform internal self-diagnostics, rank fault severities, and communicate with the BMS. This multi-functional design replaces what would otherwise require multiple specialized devices, reducing cost
3Device complexity
If a single monitoring device is used, then device complexity is reduced, but the ability to detect internal faults is limited
Solution Approach 1:
The monitoring device incorporates self-diagnostics that allow it to detect faults within its own internal components such as measurement circuits, ADC, and other electronics. The device can identify when its own measurement paths fail or produce erroneous readings, enabling a single device to monitor both external battery parameters and its own internal health without requiring additional redundant devices
Data Source
AI summary
An integrated standard-compliant data acquisition device includes an electrically insulating package including a plurality of conductive leads and an integrated circuit (IC) disposed within the electrically insulating package and electrically coupled to at least some of the plurality of conductive leads. The IC includes a first multiplexer (MUX), a second MUX, a third MUX, an analog-to-digital converter (ADC), a plurality of registers, a fourth MUX, control logic, and communication circuitry. In operation, a first circuit value under a first condition can be determined and stored, a second circuit value under a second condition can be determined and stored, and the decision as to whether there is a fault condition can be mad by comparing the first circuit value and the second circuit value.