Method for charging battery

Patent metadata

Field	Value
Publication number	US-2025385535-A1
Application number	US-202318878389-A
Country	US
Kind code	A1
Filing date	Jun 28, 2023
Priority date	Jul 8, 2022
Publication date	Dec 18, 2025
Grant date	—

Abstract

To provide a charging method in accordance with a state of a positive electrode at the start of charging. To improve charge characteristics of a battery. The charging method is a method for charging a battery including a positive electrode active material represented by Li x MO 2 in a positive electrode. The Mis one or more selected from Co, Ni, Mn, and Al. It is determined whether the first charging is necessary or not by a value of the x at a time when charging of the battery starts. In the case where the first charging is determined to be necessary, second charging and third charging are performed in order after the first charging is performed. In the case where the first charging is determined to be unnecessary, the second charging and the third charging are performed in order. The first charging is performed for a charge time longer than or equal to 10 seconds and shorter than or equal to 30 seconds with a current value that is higher than or equal to 1 C and lower than or equal to 5 C. The second charging is constant current charging, and the third charging is constant voltage charging.

First claim

1 . A method for charging a battery comprising a positive electrode active material represented by Li x MO 2 in a positive electrode,
wherein M is one or more selected from Co, Ni, Mn and Al, wherein whether first charging is necessary or not is determined by a value of x at a time when charging of the battery starts, wherein in a case where the first charging is determined to be necessary, the first charging, followed by second charging and then third charging are performed in this order, wherein in a case where the first charging is determined to be unnecessary, the second charging and then the third charging are performed in this order, wherein the first charging is charging of longer than or equal to 10 seconds and shorter than or equal to 30 seconds at a current higher than or equal to 1 C and lower than or equal to 5 C, wherein the second charging is constant current charging, and wherein the third charging is constant voltage charging.

2 . The method for charging a battery according to claim 1 , wherein in a case where the value of x is greater than or equal to 0.80 and less than or equal to 1.0, the first charging is determined to be necessary.

3 . The method for charging a battery according to claim 1 , wherein in a case where the value of x is greater than or equal to 0.40 and less than or equal to 0.60, the first charging is determined to be necessary.

4 . The method for charging a battery according to claim 1 , wherein in a case where the value of x is greater than or equal to 0.80 and less than or equal to 1.0, or is greater than or equal to 0.40 and less than or equal to 0.60, the first charging is determined to be necessary.

5 . The method for charging a battery according to claim 1 ,
wherein whether first discharging is necessary or not is determined by the value of x at the time when charging of the battery starts, wherein in a case where the first discharging is determined to be necessary, the first discharging, followed by the second charging and then the third charging are performed in this order, wherein in a case where the first discharging is determined to be unnecessary, the second charging and the third charging are performed in this order, and wherein the first discharging is discharging of longer than or equal to 10 seconds and shorter than or equal to 30 seconds at a current higher than or equal to 1 C and lower than or equal to 5 C.

6 . The method for charging a battery according to claim 5 , wherein in a case where the value of x is greater than or equal to 0.15 and less than or equal to 0.20, the first discharging is determined to be necessary.

Assignees

• Semiconductor Energy Lab

Inventors

• Yamazaki Shunpei
• Osada Takeshi
• Momma Yohei
• Jinbo Yasuhiro
• Tajima Ryota

Classifications

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• H01M10/48

  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

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H02J7/933 Primary

  the cycle being controlled or terminated in response to electric parameters · CPC title