Battery Control Device Charge Diagnosis for RAID Reliability
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Solution Overview
Problem
RAID devices face inaccuracies in charge capacity diagnosis during reactivation, leading to performance degradation due to insufficient battery power, especially when self-discharge occurs during power supply disconnection, as existing methods rely on strict voltage conditions without considering temperature and time factors.
Innovation Solution
A battery control device with a storage circuitry to record disconnection time and a diagnosis circuitry that calculates charge capacity based on disconnection period, temperature, and battery deterioration, using self-discharge characteristic curves to estimate actual capacity during reactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the RAID device operates in write back mode to improve performance, then the completion response speed is improved, but the risk of data loss increases when battery charge capacity is insufficient
Solution Approach 1:
The system performs preliminary assessment of battery charge capacity before operating in write back mode. The diagnosis circuitry evaluates whether the battery has sufficient charge capacity to support data backup during power failure, and only enables write back mode when the capacity requirement is confirmed to be met, preventing data loss while maintaining performance benefits
2Reliability
If the RAID device operates in write through mode to ensure data safety, then the data backup reliability is improved, but the completion response speed is remarkably reduced
Solution Approach 1:
The system dynamically switches between write back mode and write through mode based on real-time assessment of battery charge capacity. When the battery has sufficient capacity, write back mode is enabled for high performance; when capacity is insufficient, the system automatically transitions to write through mode to ensure data safety, creating a dynamic adaptive operation mode
3Reliability
If the charge capacity is diagnosed using strict voltage conditions to avoid data loss, then the data safety is improved, but the diagnosis accuracy deteriorates due to disparity between calculated and actual charge capacity
Solution Approach 1:
The diagnosis circuitry uses multiple parameters including battery voltage, temperature, disconnection time, and battery deterioration degree to comprehensively assess charge capacity. This multi-parameter approach replaces the single strict voltage condition method, enabling accurate diagnosis while maintaining data safety by considering the combined effect of all relevant factors
4Use of energy by moving object
If the monitoring equipment stops during power supply disconnection to save energy, then the energy consumption is reduced, but the charge capacity assessment capability is lost during self-discharge
Solution Approach 1:
The battery control device performs self-diagnosis of charge capacity using its own internal resources (storage circuitry for disconnection time, diagnosis circuitry with stored battery characteristics) without requiring continuous external power supply or monitoring equipment operation. The system can assess charge capacity even when the monitoring equipment is stopped during power supply disconnection
Data Source
AI summary
A battery control device includes: a battery; a storage circuitry configured to store a disconnection time which indicates a time at which a power supply is disconnected; and a diagnosis circuitry configured to, when the power supply is reactivated, diagnose a charge capacity of the battery at the time of reactivation based on a disconnection period obtained from the disconnection time and a time at when the power supply is reactivated, a temperature of the battery in a state during the power supply is disconnected and a deterioration degree of the battery.