Secondary battery system, secondary battery, and assembled battery system

Patent metadata

Field	Value
Publication number	US-11799309-B2
Application number	US-202217840865-A
Country	US
Kind code	B2
Filing date	Jun 15, 2022
Priority date	Mar 11, 2019
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

According to an embodiment, a secondary battery system includes a secondary battery, a calculator, and a controller. The secondary battery includes a first electrode including a first and second active materials, and a second electrode including a third active material. The calculator calculates a current ratio of currents passing through the first and second active materials for each of different values of a charge amount of the first electrode, based on capacities and capacity-versus-potential properties of the first and second active materials. The controller, based on the capacities of the first and second active materials and the current ratio when the charge amount of the first electrode takes a first value, controls the current passing through the secondary battery when the charge amount indicates the first value.

First claim

What is claimed is:

1. A secondary battery system comprising:
a secondary battery comprising a first electrode including a first active material and a second active material, and a second electrode including at least a third active material;
a current ratio calculator configured to calculate a current ratio of a current passing through the first active material and a current passing through the second active material for each of different values of a charge amount of the first electrode, based on a capacity and capacity-versus-potential properties of the first active material and a capacity and capacity-versus-potential properties of the second active material; and a setter configured to set an operational range of the secondary battery based on the capacity of the first active material, the capacity of the second active material, and the current ratio.

2. The system according to claim 1 , wherein the setter calculates a first ratio of a current passing through the first active material to a current passing through the first electrode based on the current ratio when the charge amount of the first electrode takes one of the different values, and excludes from the operational range of the secondary battery a charge amount range of the first electrode within which a product of (a) the first ratio, (b) a reciprocal of a second ratio of the capacity of the first active material to a capacity of the first electrode, and (c) a charging rate or discharging rate of the secondary battery, exceeds a threshold value.

Assignees

• Toshiba Kk

Inventors

• Sugiyama Nobukatsu
• Fujita Yumi
• Morita Tomokazu

Classifications

• H02J7/865 Primary

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

• H02J7/94

  in response to battery current · CPC title

• H02J7/0068 Primary

  Electricity · mapped topic

• G01R19/10

  Measuring sum, difference or ratio · CPC title

• H01M10/4257

  Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries · CPC title