Management device and power storage system

Patent metadata

Field	Value
Publication number	US-2019181663-A1
Application number	US-201916275242-A
Country	US
Kind code	A1
Filing date	Feb 13, 2019
Priority date	Aug 30, 2016
Publication date	Jun 13, 2019
Grant date	—

Abstract

A smoothing unit smooths a detected voltage of each power storage block based on previous data during a certain period. A calculator calculates a difference between a smoothing voltage of one power storage block in the n power storage blocks and a representative value of the smoothing voltages of the other power storage blocks or all the power storage blocks. A determination unit determines a power storage block whose difference against the representative value enlarges more than or equal to a set value during a predetermined period as a power storage block containing an abnormal power storage cell.

First claim

1 . A management device configured to manage a power storage module including n power storage blocks series-connected, where n is an integer of 2 or greater, each of the power storage blocks containing m power storage cells parallel-connected, where m is an integer of 1 or greater,
the management device comprising: a voltage detector that detects each voltage of the n power storage blocks; a smoothing unit that smooths the detected voltage of each of the power storage blocks based on previous data during a certain period; a calculator that calculates a difference between a smoothing voltage of one power storage block in the n power storage blocks and a representative value of smoothing voltages of the other power storage blocks or all the power storage blocks; and a determination unit that determines a power storage block whose difference against the representative value enlarges more than or equal to a set value during a predetermined period as a power storage block containing an abnormal power storage cell.

2 . The management device according to claim 1 , wherein
the smoothing unit smooths the detected voltage of each of the power storage blocks based on previous data during more than or equal to 10 hours.

3 . The management device according to claim 1 , wherein
the calculator calculates a difference between the smoothing voltage of one power storage block in the n power storage blocks and a median of the other power storage blocks.

4 . A management device configured to manage a power storage module including n power storage blocks series-connected, where n is an integer of 2 or greater, each of the power storage blocks containing m power storage cells parallel-connected, where m is an integer of 1 or greater,
the management device comprising:
a voltage detector that detects each voltage of the n power storage blocks;
a smoothing unit that smooths a state of charge (SOC) based on the detected voltage of each of the power storage blocks, based on previous data during a certain period;
a calculator that calculates a difference between a smoothing SOC of one power storage block in the n power storage blocks and a representative value of smoothing SOCs of the other power storage blocks or all the power storage blocks; and
a determination unit that determines a power storage block whose difference against the representative value enlarges more than or equal to a set value during a predetermined period as a power storage block containing an abnormal power storage cell.

5 . The management device according to claim 1 , wherein
smoothing processing by the smoothing unit, calculation processing of the difference by the calculator, and determination processing by the determination unit are executed when the voltage of the power storage block fits within a predetermined range, and are stopped when the voltage of the power storage block deviates from the predetermined range.

6 . The management device according to claim 1 , wherein
smoothing processing by the smoothing unit, calculation processing of the difference by the calculator, and determination processing by the determination unit are executed when an SOC of the power storage block fits within a predetermined range, and are stopped when the SOC of the power storage block deviates from the predetermined range.

7 . A power storage system comprising:
a power storage module; and the management device according to claim 1 , that manages the power storage module.

8 . The management device according to claim 4 , wherein
smoothing processing by the smoothing unit, calculation processing of the difference by the calculator, and determination processing by the determination unit are executed when the voltage of the power storage block fits within a predetermined range, and are stopped when the voltage of the power storage block deviates from the predetermined range.

9 . The management device according to claim 4 , wherein
smoothing processing by the smoothing unit, calculation processing of the difference by the calculator, and determination processing by the determination unit are executed when an SOC of the power storage block fits within a predetermined range, and are stopped when the SOC of the power storage block deviates from the predetermined range.

10 . A power storage system comprising:
a power storage module; and the management device according to claim 4 , that manages the power storage module.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Nishikawa Shinya
• Itakura Yusuke
• Iida Takashi

Classifications

• H02J2105/30

  the load networks being external to vehicles, i.e. exchanging power with vehicles · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/50

  acting upon multiple batteries simultaneously or sequentially · CPC title

• H01M2010/4278

  Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller · CPC title

• H01M2010/4271

  Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing · CPC title