Li-Ion Battery State Determination via Stable-Post-Charge Deformation
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Solution Overview
Problem
Lithium ion batteries degrade due to repeated charging and discharging, leading to inaccurate deformation detection and potential risks of ignition or explosion, as the deformation amount varies non-monotonically over time, making it difficult to determine their state accurately.
Innovation Solution
An electronic apparatus equipped with a strain detector to measure deformation, a full charge detector to determine full charge, a stable state detector to confirm stability after full charge, and a state determination unit to assess the battery's state based on deformation data when in a stable condition, allowing for accurate determination of the battery's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If deformation amount is detected continuously over time, then monitoring capability is improved, but measurement precision deteriorates due to charge-discharge induced variations
Solution Approach 1:
The patent applies preliminary action by waiting for the battery to reach a stable state after full charge before performing deformation amount detection. The control unit detects when the battery is fully charged, then waits for a predetermined period to allow the battery to stabilize, ensuring that deformation measurements are taken only when the battery is in a stable state, thereby eliminating charge-discharge induced variations and improving measurement precision while maintaining continuous monitoring capability
2Productivity
If deformation detection is performed at any timing, then detection frequency is improved, but reliability deteriorates due to timing-dependent errors
Solution Approach 1:
The patent implements feedback by using the control unit to continuously monitor battery charge status and detect when full charge is achieved. Based on this feedback, the system determines the appropriate timing for deformation detection - only when the battery is in a stable state after full charge. This feedback mechanism ensures that deformation detection is performed at optimal timing, improving both detection frequency and reliability by eliminating timing-dependent errors
Data Source
AI summary
An electronic apparatus includes a secondary battery, a deformation amount detector configured to detect a deformation amount of the secondary battery, a full charge detector configured to detect a full charge of the secondary battery, a stable state detector configured to detect a stable state after a full charge is detected by the full charge detector, and a state determination unit configured to determine a state of the secondary battery using the deformation amount detected by the deformation amount detector when the stable state is detected by the stable state detector.