Battery Pack Fault Correlation to Prevent False Disconnects
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Solution Overview
Problem
Existing energy storage systems in vehicles often experience unnecessary and undesirable disconnections of battery packs due to mis-triggered or mis-interpreted faults or errors in voltage measurements, leading to worsened availability of the energy storage system.
Innovation Solution
A computer system with processing circuitry is configured to identify faults or errors in voltage measurements of multiple battery packs and, if corresponding faults or errors are detected within a specific time interval, prevent the disconnection of at least one battery pack, thereby assuming the issue is mis-triggered rather than authentic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If battery packs are disconnected upon fault detection to prevent damage, then protection against authentic faults is improved, but system availability deteriorates due to mis-triggered disconnections
Solution Approach 1:
The control device acts as an intermediary between fault detection and disconnection execution. It introduces an additional decision layer that compares fault patterns across multiple battery packs, using this comparison as a mediator to determine whether disconnection is truly necessary or if it would be a mis-triggered action.
Solution Approach 2:
The system performs a preliminary verification step before executing disconnection by checking whether corresponding faults appear in other battery packs within a predetermined time interval. This preliminary action filters out mis-triggered faults while maintaining protection against authentic faults.
2Measurement precision
If monitoring of multiple battery packs is implemented to detect corresponding faults, then accuracy in distinguishing mis-triggered faults is improved, but system complexity increases
Solution Approach 1:
The control device performs multiple functions: it manages normal battery pack operation, detects faults, compares fault patterns across packs, and makes disconnection decisions. By making the control device universal and multi-functional, the system achieves improved fault detection accuracy without adding separate dedicated hardware for each function.
Solution Approach 2:
The system merges the fault detection and comparison functions into a unified control process. Instead of having separate systems for detecting faults and for comparing them, the control device combines these functions, reducing overall system complexity while maintaining high measurement precision.
Data Source
AI summary
A computer system is configured to identify a fault or error from a voltage measurement in a first battery pack of an energy storage system at a first point in time and during a first time interval; identify a corresponding fault or error from a voltage measurement in a second battery pack of the energy storage system at a second point in time and during the first time interval, the second point in time being subsequent to the first point in time; in response of identifying the corresponding faults or errors of the voltage measurements in the first and second battery packs during the first time interval, prevent disconnection of at least the second battery pack.