Method and apparatus to predict capacity fade rate of battery

Patent metadata

Field	Value
Publication number	US-2018316204-A1
Application number	US-201815879833-A
Country	US
Kind code	A1
Filing date	Jan 25, 2018
Priority date	Apr 28, 2017
Publication date	Nov 1, 2018
Grant date	—

Abstract

A method and apparatus for predicting a capacity fade rate of a battery are provided. The method includes collecting capacity degradation data of a battery based on a current and a state of charge (SOC) for a predefined number of cycles, generating a capacity fade model based on the capacity degradation data, and estimating a capacity fade rate of the battery using the capacity fade model.

First claim

What is claimed is:

1 . A method of predicting a capacity fade rate of a battery, the method comprising:
collecting capacity degradation data of a battery based on a current and a state of charge (SOC) for a predefined number of cycles; generating a capacity fade model based on the capacity degradation data; and estimating a capacity fade rate of the battery using the capacity fade model.

2 . The method of claim 1 , wherein
the capacity fade model comprises dividing a difference in logarithm of fractional capacities after a cycling between different SOCs by a product that comprises a difference between the SOCs and the number of cycles, and the fractional capacities are each defined as a ratio of a cell capacity at an end of the cycling to an initial cell capacity.

3 . The method of claim 1 , wherein the battery comprises any one or any combination of a nickel-cadmium battery, a nickel-metal hydride battery, a lithium-ion battery, a lithium sulfur battery, a thin film battery, a carbon foam-based lead acid battery, a potassium-ion battery and a sodium-ion battery.

4 . The method of claim 1 , wherein the number of cycles is determined based on maximum allowable degradation conditions.

5 . The method of claim 1 , wherein
the capacity degradation data is collected based on a change in a condition, and the condition comprises a first condition with an equal degradation level during a charge and discharge cycle and a second condition with a different degradation level during a charge and discharge cycle, at a constant charging current.

6 . The method of claim 1 , wherein the capacity fade rate is notified from a mobile phone of a user.

7 . A non-transitory computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the method of claim 1 .

8 . An apparatus for predicting a capacity fade rate of a battery, the apparatus comprising:
a multichannel battery cycler configured to collect capacity degradation data of a battery based on a current and a state of charge (SOC) for a predefined number of cycles; a capacity fade modeler configured to generate a capacity fade model based on the capacity degradation data; and a controller configured to estimate a capacity fade rate of the battery using the capacity fade model.

9 . The apparatus of claim 8 , wherein
the capacity fade model comprises dividing a difference in logarithm of fractional capacities after a cycling between different SOCs by a product that comprises a difference between the SOCs and the number of cycles, and the fractional capacities are each defined as a ratio of a cell capacity at an end of the cycling to an initial cell capacity.

10 . The apparatus of claim 8 , wherein the battery comprises any one or any combination of a nickel-cadmium battery, a nickel-metal hydride battery, a lithium-ion battery, a lithium sulfur battery, a thin film battery, a carbon foam-based lead acid battery, a potassium-ion battery and a sodium-ion battery.

11 . The apparatus of claim 8 , wherein the number of cycles is determined based on maximum allowable degradation conditions.

12 . The apparatus of claim 8 , wherein
the capacity degradation data is collected based on a change in a condition, and the condition comprises a first condition with an equal degradation level during a charge and discharge cycle and a second condition with a different degradation level during a charge and discharge cycle, at a constant charging current.

13 . The apparatus of claim 8 , wherein the capacity fade rate is notified from a mobile phone of a user.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Basu Suman
• Hariharan Krishnan S
• Song Tae Won

Classifications

• H01M10/48 Primary

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• H02J7/84

  Control of state of health [SOH] · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• G01R31/367

  Software therefor, e.g. for battery testing using modelling or look-up tables · CPC title

• G01R31/392

  Determining battery ageing or deterioration, e.g. state of health · CPC title