Charge and discharge control device, battery pack, vehicle, and charge and discharge control method

Patent metadata

Field	Value
Publication number	US-2021075225-A1
Application number	US-202016783265-A
Country	US
Kind code	A1
Filing date	Feb 6, 2020
Priority date	Sep 11, 2019
Publication date	Mar 11, 2021
Grant date	—

Abstract

According to one embodiment, information related to a positive-electrode electric potential and a negative-electrode electric potential of each of one or more batteries is acquired, and whether deviation of the positive/negative-electrode electric potentials from a reference state is beyond a prescribed range is determined for each of one or more batteries. Further, in response to at least existence of a battery-to-be-restored that is a battery in which the determined deviation of positive/negative-electrode electric potentials from a reference state is beyond a prescribed range, a state of charge of the battery-to-be-restored is held in a restoration holding range for a prescribed time.

First claim

What is claimed is:

1 . A charge and discharge control device configured to control charge and discharge of one or more batteries, comprising a controller configured to:
acquire information related to a positive-electrode electric potential and a negative-electrode electric potential of each of the one or more batteries; determine whether deviation of the positive-electrode electric potential and the negative-electrode electric potential from a reference state is beyond a prescribed range based on the acquired information, for each of the one or more batteries; and in response to at least existence of a battery-to-be-restored that is a battery in which the determined deviation of the positive-electrode electric potential and the negative-electrode electric potential from the reference state is beyond the prescribed range, hold a state of charge of the battery-to-be-restored in a restoration holding range for a prescribed time.

2 . The charge and discharge control device according to claim 1 , wherein the controller is configured to hold the state of charge of each of the one or more batteries in a normal use range different from the restoration holding range when the battery-to-be-restored does not exist.

3 . The charge and discharge control device according to claim 1 , wherein the controller is configured to acquire information indicating a relation between a voltage applied by one or some out of the one or more batteries and the state of charge, as the information related to the positive-electrode electric potential and the negative-electrode electric potential of each of the one or more batteries.

4 . The charge and discharge control device according to claim 1 , wherein the controller is configured to acquire information about a use history of each of the one or more batteries, as the information about the positive-electrode electric potential and the negative-electrode electric potential of each of the one or more batteries.

5 . The charge and discharge control device according to claim 1 , wherein the controller is configured to hold the state of charge of the battery-to-be-restored in the restoration holding range from 0% to 40% when the positive-electrode electric potential and the negative-electrode electric potential of the battery-to-be-restored deviate from the reference state toward a high-potential side.

6 . The charge and discharge control device according to claim 1 , wherein the controller is configured to hold the state of charge of the battery-to-be-restored in the restoration holding range from 60% to 95% when the positive-electrode electric potential and the negative-electrode electric potential of the battery-to-be-restored deviate from the reference state toward a low-potential side.

7 . The charge and discharge control device according to claim 1 , wherein the controller is configured to regulate a temperature of the battery-to-be-restored in a range from 30° C. to 50° C. while holding the state of charge of the battery-to-be-restored in the restoration holding range.

8 . A battery pack comprising:
the charge and discharge control device according to claim 1 ; and the one or more batteries of which charge and discharge are controlled by the charge and discharge control device.

9 . A vehicle comprising:
the charge and discharge control device according to claim 1 ; and the one or more batteries of which charge and discharge are controlled by the charge and discharge control device.

10 . A charge and discharge control method of controlling charge and discharge of one or more batteries, comprising:
acquiring information related to a positive-electrode electric potential and a negative-electrode electric potential for each of the one or more batteries; determining whether deviation of the positive-electrode electric potential and the negative-electrode electric potential from a reference state is beyond a prescribed range based on the acquired information, for each of the one or more batteries; and in response to at least existence of a battery-to-be-restored that is a battery in which the determined deviation of the positive-electrode electric potential and the negative-electrode electric potential from the reference state is beyond the prescribed range, holding a state of charge of the battery-to-be-restored in a restoration holding range for a prescribed time.

Assignees

• Toshiba Kk

Inventors

• Fukaya Taro
• Takami Norio
• Harada Yasuhiro
• Kishi Takashi
• Hoshina Keigo
• Yoshima Kazuomi
• Yamashita Yasunobu

Classifications

• H02J7/90

  Regulation of charging or discharging current or voltage · CPC title

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• H02J7/50 Primary

  acting upon multiple batteries simultaneously or sequentially · CPC title

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/875

  Charging or discharging for charge maintenance, battery initiation or rejuvenation · CPC title