Charge state estimation method
By setting a threshold for the difference between OCV and terminal voltage to determine depolarization time, the method ensures accurate SOC estimation with reduced error and faster processing.
JP2026076736APending Publication Date: 2026-05-12DAIHATSU MOTOR CO LTD
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Patent Information
- Application Number
- JP2024187543
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-10-24
- Publication Date
- 2026-05-12
AI Technical Summary
Technical Problem
Conventional methods lack a specific method for determining the time required for depolarization before estimating the state of charge (SOC) of a rechargeable battery, leading to inefficiencies in SOC estimation.
Method used
A method that determines whether polarization has been resolved by checking if a predetermined time has elapsed since charging or discharging, using the difference between open-circuit voltage (OCV) and terminal voltage to set a threshold, and estimates SOC based on OCV when the voltage difference meets a predetermined threshold.
Benefits of technology
Enables reliable determination of depolarization time and accurate SOC estimation in a shorter time, with an estimation error of n% or less.
✦ Generated by Eureka AI based on patent content.
Abstract
This invention provides a method for estimating the charge state (SOC) of a rechargeable battery that allows for accurate determination of the waiting time (rest time) required to ensure depolarization before estimating the charge state (SOC) of the rechargeable battery, thereby enabling faster estimation of the charge state. [Solution] The charge state estimation method of the embodiment determines whether the polarization of the battery has been resolved based on whether a predetermined time has elapsed since the end of charging and discharging of the battery, and if it is determined that the polarization has been resolved, it estimates the charge state of the battery based on the open circuit voltage of the battery, wherein the predetermined time is the time until the difference between the open circuit voltage and the terminal voltage of the battery after the end of charging and discharging falls below a predetermined threshold, and the predetermined threshold is the minimum value of the change in the open circuit voltage when the charge state of the battery changes by a predetermined percentage.
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