Charge control method, charge control apparatus, and battery-mounted equipment

Patent metadata

Field	Value
Publication number	US-12562410-B2
Application number	US-202217822752-A
Country	US
Kind code	B2
Filing date	Aug 26, 2022
Priority date	Mar 17, 2022
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

A charge control method includes acquiring a measured temperature of a lithium ion battery, acquiring a threshold value for stopping charging of the lithium ion battery according to the measured temperature of the lithium ion battery based on a relationship between a cycle life and a charging capacity of the lithium ion battery for each temperature of the lithium ion battery, and, charging the lithium ion battery based on the threshold value.

First claim

What is claimed is:

1 . A charge control method comprising:
acquiring a measured temperature of a lithium ion battery, the lithium ion battery including a negative electrode using one of a niobium-tungsten oxide, a niobium-molybdenum oxide, and a lithium titanate as an active material; acquiring an end-of-charge voltage for stopping charging of the lithium ion battery according to the measured temperature of the lithium ion battery based on a relationship between a cycle life and a charging capacity of the lithium ion battery for each temperature of the lithium ion battery; and charging the lithium ion battery based on the end-of-charge voltage, wherein the acquiring the end-of-charge voltage comprises:
determining whether a charging mode is a long-life mode or a high-capacity mode;
acquiring, in a case where the high-capacity mode is selected by a user operation, an end-of-charge voltage that exceeds a full-charge end-of-charge voltage determined based on the relationship between the cycle life and the charging capacity of the lithium ion battery for each temperature of the lithium ion battery; and
acquiring, in a case where the long-life mode is selected by the user operation, an end-of-charge voltage that falls below the full-charge end-of-charge voltage determined based on the relationship between the cycle life and the charging capacity of the lithium ion battery for each temperature of the lithium ion battery.

2 . The charge control method according to claim 1 , wherein
the lithium ion battery includes a plurality of battery cells, and the acquiring a measured temperature of the lithium ion battery includes acquiring a highest temperature among measured temperatures of the battery cells.

3 . A charge control apparatus comprising a controller configured to:
acquire a measured temperature of a lithium ion battery, the lithium ion battery including a negative electrode using one of a niobium-tungsten oxide, a niobium-molybdenum oxide, and a lithium titanate as an active material; acquire an end-of-charge voltage for stopping charging of the lithium ion battery according to the measured temperature of the lithium ion battery, based on a relationship between a cycle life and a charging capacity of the lithium ion battery for each temperature of the lithium ion battery; and charge the lithium ion battery based on the end-of-charge voltage, wherein in acquiring the end-of-charge voltage, the controller is configured to:
determine whether a charging mode is a long-life mode or a high-capacity mode;
acquire, in a case where the high-capacity mode is selected by a user operation, an end-of-charge voltage that exceeds a full-charge end-of-charge voltage determined based on the relationship between the cycle life and the charging capacity of the lithium ion battery for each temperature of the lithium ion battery; and
acquire, in a case where the long-life mode is selected by the user operation, an end-of-charge voltage that falls below the full-charge end-of-charge voltage determined based on the relationship between the cycle life and the charging capacity of the lithium ion battery for each temperature of the lithium ion battery.

4 . Battery-mounted equipment comprising the charge control apparatus according to claim 3 .

Assignees

• Toshiba Kk

Inventors

• Harada Yasuhiro
• Ise Kazuki
• Yamashita Yasunobu
• Takami Norio

Classifications

• H02J7/971

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

• H02J7/96

  in response to battery voltage · CPC title

• H02J7/92

  with prioritisation of loads or sources · CPC title

• H02J7/84

  Control of state of health [SOH] · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title