Battery Pack Anomaly Detection via Voltage Deviation
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Solution Overview
Problem
Existing inspection methods for high-capacity battery packs, such as those used in electric vehicles, face challenges in detecting connection anomalies within the pack due to varying battery voltage characteristics influenced by cell temperatures, making it impractical to apply individual cell temperature measurements for anomaly judgment.
Innovation Solution
The method involves charging the battery pack at a constant current, retrieving initial and secondary cell voltages, calculating deviation values, and comparing them to detect anomalies in cell connections, allowing for the identification of parallel and series connection issues without the need for individual cell temperature measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual cell temperature measurement is used for anomaly judgment, then measurement precision is improved, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The patent extracts the temperature measurement requirement from the anomaly detection system. Instead of measuring actual cell temperatures with sensors, the invention uses voltage measurements taken under controlled charging conditions as a proxy indicator, effectively removing the need for temperature sensors while maintaining detection capability
Solution Approach 2:
The patent introduces voltage measurement as an intermediary parameter to indirectly assess cell conditions. By measuring voltage deviations during constant current charging rather than directly measuring temperature, the system achieves anomaly detection without requiring temperature measurement infrastructure
2Reliability
If battery pack inspection is performed after assembly, then reliability is improved, but productivity deteriorates
Solution Approach 1:
The patent performs the inspection action at the optimal moment during the charging process rather than as a separate post-assembly step. By conducting voltage measurements during the constant current charging phase when anomalies manifest clearly, the inspection is integrated into the normal charging workflow, avoiding additional time penalties
Solution Approach 2:
The patent focuses measurements on specific critical parameters (voltage deviations during constant current charging) rather than comprehensive testing. By monitoring only the voltage behavior during the charged state transition, the system achieves effective anomaly detection with minimal measurement overhead
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables effective detection of connection anomalies within the battery pack, improving the quality of the battery pack by identifying and distinguishing between parallel and series connection issues, facilitating easier troubleshooting and maintenance.
Implementation Method 1
the characteristics of the battery voltage vary depending on the cell temperatures... judging the occurrence of an anomaly such as short-circuit or internal resistance increase
Data Source
AI summary
The inspection device includes a charging unit and an inspection unit, and detects the connection anomaly by retrieving a first cell voltage at the early stage of start of the constant-current charging and a second cell voltage at a stage where the charging has progressed to determine deviations from the average value of all the cell groups.