Battery Remaining Capacity Estimation via Real-Time DOD Curve Update
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Solution Overview
Problem
Existing battery systems face challenges in accurately estimating remaining capacity due to temporal degradation of the depth-of-discharge characteristic curve, requiring periodic updates that disrupt operations and necessitate dedicated measurement devices.
Innovation Solution
A battery system with a current measurement unit, voltage measurement unit, function creation unit, and remaining capacity calculation unit that continuously updates the depth-of-discharge characteristic curve in real-time, allowing for accurate remaining capacity estimation without disrupting operations or requiring dedicated measurement devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the depth-of-discharge characteristic curve is updated by periodically measuring the battery, then the remaining capacity estimation accuracy is improved, but the equipment operation is disrupted and dedicated measurement devices are required
Solution Approach 1:
The battery system uses its own operating data (voltage and current measurements during normal operation) to automatically update the depth-of-discharge characteristic curve, eliminating the need for dedicated measurement devices and periodic maintenance that disrupts operation
Solution Approach 2:
The system continuously updates the depth-of-discharge characteristic curve using voltage and current measurements taken during normal battery operation, ensuring that the remaining capacity estimation accuracy is maintained without interrupting equipment operation
2Measurement precision
If the depth-of-discharge characteristic curve is updated by periodically measuring the battery, then the remaining capacity estimation accuracy is improved, but dedicated measurement devices and additional complexity are required
Solution Approach 1:
The existing voltage and current measurement systems, originally designed for monitoring battery status during operation, are repurposed to also update the depth-of-discharge characteristic curve, eliminating the need for dedicated measurement devices
Solution Approach 2:
The battery system uses its own operating data (voltage and current measurements during normal operation) to automatically update the depth-of-discharge characteristic curve, eliminating the need for dedicated measurement devices and periodic maintenance that disrupts operation
Data Source
AI summary
Certain embodiments provide battery system including: a battery; a current measurement unit configured to measure a current charged to or discharged from the battery; a voltage measurement unit configured to measure an output voltage of the battery; a function creation unit configured to create a function representing a depth-of-discharge characteristic of the battery on the basis of the measured current and output voltage; and a remaining capacity calculation unit configured to calculate a remaining capacity corresponding to the output voltage of the battery using the created function.