ESS Power Path Fault Detection Using Aggregate Cell Comparison
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Solution Overview
Problem
Existing energy storage systems (ESS) face challenges in detecting power path faults such as interconnection issues between battery packs and high-voltage distribution boxes, which can lead to conductivity loss, increased resistance, arcing, and thermal events, posing a fire risk.
Innovation Solution
A device with circuitry that monitors energy storage elements by comparing parameter values of individual elements to aggregate function values, detecting deviations beyond thresholds to identify power path faults, and triggers disconnection or alerts to mitigate risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional monitoring methods are used for energy storage elements, then the system structure remains simple, but power path faults cannot be detected in time leading to thermal events and fires
Solution Approach 1:
The patent implements feedback by continuously monitoring parameters of individual energy storage elements and comparing them against aggregate values from other elements. When a deviation beyond threshold is detected, the system provides feedback to isolate the faulty element, enabling timely fault detection while maintaining system safety without requiring complex additional hardware
Solution Approach 2:
The monitoring system utilizes the existing parameter data from energy storage elements themselves to perform fault detection. By comparing each element's parameters against the aggregate of other elements, the system enables self-diagnosis and self-isolation capabilities without requiring external complex monitoring equipment
2Reliability
If no fault detection system is implemented, then the system remains simple to operate, but power path faults lead to conductivity loss, increased resistance, and arcing
Solution Approach 1:
The system automatically detects faults through continuous parameter monitoring and comparison, providing feedback that triggers isolation of faulty elements. This automated feedback mechanism enhances system safety without requiring manual intervention or complex operational procedures from users
Solution Approach 2:
The patent replaces manual fault detection and isolation procedures with an automated electronic monitoring and control system. The circuitry automatically compares parameters, detects deviations, and triggers isolation mechanisms, substituting manual mechanical operations with automated electronic control to improve safety while maintaining ease of operation
3Measurement precision
If individual parameter monitoring of each energy storage element is performed, then power path faults can be detected, but the measurement and detection complexity increases
Solution Approach 1:
The system achieves precise fault detection by implementing feedback comparison between individual element parameters and aggregate values from other elements. This feedback mechanism enables accurate identification of deviations without requiring complex measurement systems, as the comparison process itself highlights anomalies
Solution Approach 2:
The patent introduces aggregate function values as an intermediary reference for comparing individual element parameters. This intermediary approach simplifies detection complexity by providing a baseline for comparison, enabling precise fault identification through straightforward deviation analysis rather than complex multi-parameter analysis
Data Source
AI summary
A device for power path fault detection in an energy storage system, ESS, is provided. The device is configured to obtain values for a parameter of energy storage elements of the ESS; to determine a deviation of the value of a first energy storage element from an aggregate function value, wherein the aggregate function value is formed based on values of the parameter for one or more other energy storage elements than the first energy storage element. The device is configured to determine that the deviation is beyond a first threshold value and, in response thereto, detect a power path fault pertinent to the first energy storage element.