Voltage Detecting Device with Mode Switching for Battery Stack Diagnosis
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Solution Overview
Problem
Conventional voltage detecting devices for assembled batteries in electric vehicles and hybrid vehicles require longer diagnosis times due to errors in the operation period of A/D converters, which prolongs the time needed for capacity balance adjustment and failure diagnosis.
Innovation Solution
A voltage detecting device with a mode switching unit that alternates between active and standby modes based on timing to detect cell voltages, allowing for accurate voltage detection without considering errors, thereby shortening the diagnosis term and extending the time interval for capacity balance adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a free-running A/D converter is used to detect voltage periodically, then voltage detection can be performed continuously, but the diagnosis time becomes longer due to operation period errors
Solution Approach 1:
The A/D converter operates periodically at predetermined intervals rather than continuously, with the mode switching unit controlling activation timing. This periodic operation reduces cumulative timing errors while maintaining adequate voltage detection coverage for diagnosis purposes.
Solution Approach 2:
The system dynamically switches between active and standby modes based on detection needs. The mode switching unit activates the A/D converter only when voltage detection is required, rather than maintaining continuous operation, thereby reducing error accumulation and diagnosis time.
2Reliability
If the diagnosis term is extended to account for A/D converter operation errors, then measurement reliability improves, but the time available for capacity balance adjustment decreases
Solution Approach 1:
The mode switching unit is pre-configured with predetermined intervals for voltage detection. By planning detection timing in advance rather than relying on continuous operation with error accumulation, the system maintains diagnosis reliability while freeing up time for capacity balance adjustment.
3Measurement precision
If the A/D converter operates continuously to ensure adequate voltage monitoring, then measurement coverage is improved, but energy consumption increases
Solution Approach 1:
The A/D converter is activated periodically at predetermined intervals rather than continuously. The mode switching unit controls the timing of activation, ensuring adequate voltage monitoring coverage while minimizing power consumption by keeping the converter in standby mode between measurements.
Solution Approach 2:
The continuous operation mode is extracted and replaced with selective periodic activation. Only the necessary voltage detection function is performed at specific intervals, removing the energy waste associated with continuous operation while maintaining essential monitoring capabilities.
Data Source
AI summary
A voltage detecting device according to an aspect of embodiments includes a detecting unit and a mode switching unit. The detecting unit detects voltages of battery cells of a battery stack in which the battery cells are connected to each other. The mode switching unit switches between an active mode in which the detecting unit detects the voltages and a standby mode in which a current flowing into the detecting unit is less than a predetermined value. Moreover, the detecting unit includes a voltage detecting unit that detects the voltages of the battery cells and/or a voltage of a power supply of the detecting unit in a predetermined interval. The mode switching unit switches between the active mode and the standby mode in accordance with a timing at which the voltage detecting unit detects the voltage (s).