Systems and methods for estimating the remaining value of used batteries in terms of safety and health conditions.
By calculating the first derivative of battery impedance and using non-invasive measurement technology to identify plating and degradation characteristics at the module level, the problem of high detection costs and safety hazards in battery reuse applications in existing technologies is solved, and accurate estimation of battery remaining value and improved safety are achieved.
CN122307394APending Publication Date: 2026-06-30TOYOTA MOTOR ENG & MFG NORTH AMERICA INC
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- TOYOTA MOTOR ENG & MFG NORTH AMERICA INC
- Filing Date
- 2025-12-10
- Publication Date
- 2026-06-30
AI Technical Summary
Technical Problem
Existing technologies are insufficient for effectively detecting and assessing the health and safety status of used batteries, leading to safety hazards and high testing costs in their reuse applications.
Method used
By calculating the first derivative of impedance, non-invasive measurement techniques can be used to identify plating and other degradation features at the module level, estimate the remaining value of the battery, and avoid disassembly of the battery cell and complex invasive testing.
Benefits of technology
It enables accurate estimation of remaining battery value, reduces detection costs and complexity, and improves the safety and reliability of reuse applications.
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Smart Images
Figure CN122307394A_ABST
Abstract
This application relates to systems and methods for estimating the remaining value of a used battery in terms of a safe state and a health state. The systems and methods described herein relate to estimating the remaining value of a used battery based on a safe state calculated using the derivative of a measured impedance and a health state for reuse applications. In one embodiment, a method includes measuring the impedance of the used battery using a device with a test apparatus at a target temperature and a target state of charge (SOC), where the target temperature and target SOC are correlated with the chemical activity of the used battery. The method also includes removing interference sources by calculating the first derivative of the real part of the impedance. The method further includes estimating the remaining value based on the safe state and health state obtained from changes in the first derivative within a utilized frequency band. The method also includes transmitting the remaining value to a device, and having the device draw power from the used battery during reuse operations when the remaining value satisfies parameters.
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