Battery State Estimation from Non-Contact Acoustic Emissions
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Solution Overview
Problem
Existing methods for estimating the internal state of secondary batteries, such as those with cells enclosed in a battery pack, require contact and are time-consuming, limiting their applicability and efficiency.
Innovation Solution
A non-contact state quantity estimation device that collects sounds emitted during charge or discharge using a sound collector and estimates the battery state through a machine learning model based on sound information, allowing for quick and accurate estimation of state of charge and health without physical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a vibration sensor is brought into intimate contact with the secondary battery to measure acoustic emissions, then the state quantity can be estimated in a shorter time, but the method cannot be used for batteries with enclosed structures such as battery packs
Solution Approach 1:
The patent replaces the mechanical contact-based vibration sensor with an optical measurement system (laser interferometer or similar non-contact acoustic emission sensor). This substitution allows the system to measure acoustic emissions from enclosed battery structures without physical contact, thereby maintaining fast estimation speed while expanding applicability to battery packs and other enclosed configurations.
2Measurement precision
If full charging or discharging is performed to estimate the internal state of the secondary battery, then accurate state quantity estimation is achieved, but the process takes a long time
Solution Approach 1:
The patent applies preliminary action by performing acoustic emission measurements during normal charge/discharge operations before full charging or discharging is completed. The acoustic emission signals provide real-time information about internal battery state changes, allowing estimation to be performed at any state of charge rather than requiring the time-consuming process of complete charging or discharging cycles.
Solution Approach 2:
The patent introduces acoustic emissions as an intermediary physical phenomenon that correlates with internal battery state changes. By measuring these acoustic signals during normal operation, the system can infer internal state information without requiring the battery to reach extreme charge states, thus achieving accurate estimation in a fraction of the time required by conventional methods.
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
Enables rapid and accurate estimation of secondary battery state, including state of charge and health, even for batteries enclosed in packs, without the need for full charging or discharging, enhancing convenience and versatility.
Implementation Method 1
measuring acoustic emissions (ultrasonic waves) generated inside the secondary battery during charge or discharge of the secondary battery
Data Source
AI summary
A state quantity estimation device includes: a sound collector that collects, in the vicinity of a secondary battery without contact with the secondary battery, a sound emitted from the secondary battery during charge or discharge of the secondary battery; an estimator that estimates a state quantity indicating a state of the secondary battery, based on information on the sound collected by the sound collector; and an outputter that outputs the state quantity estimated by the estimator.