Method for determining battery state of lithium ion secondary battery
US11300627B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 2020 |
| Grant date | Apr 12, 2022 |
| Priority date | — |
| Expiry date | Jun 2, 2040 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Provided is a method for determining a battery state of a lithium ion secondary battery that allows for understand a deterioration state of the battery without performing full charging of the battery.To estimate an entire image of a charge-discharge curve on the basis of a fragmentary charge-discharge curve by analyzing a relaxation process after the electric current interruption to grasp the resistance of a battery and taking into consideration a resulting resistance value.Specifically, a method for determining a battery state of a lithium ion secondary battery includes: a partial charge-discharge curve calculating step of acquiring, by partial charge or partial discharge, a partial charge-discharge curve which is a part of a charge-discharge curve, and calculating a positive electrode partial charge-discharge curve and a negative electrode partial charge-discharge curve; a resistance grasping step of grasping a resistance value of the lithium ion secondary battery on a basis of a relaxation process of a terminal voltage after interrupting a charging current during charging or a discharge current during discharging; and a charge-discharge curve calculating step of taking into cons…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.