Management apparatus and power storage system

Patent metadata

Field	Value
Publication number	US-10838013-B2
Application number	US-201816218536-A
Country	US
Kind code	B2
Filing date	Dec 13, 2018
Priority date	Jun 16, 2016
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A voltage detection unit detects voltage between both ends of a power storage unit. A current detection unit detects current flowing through the power storage unit. A control unit estimates a state of charge (SOC) of the power storage unit using an open circuit voltage (OCV) method based on the voltage detected by the voltage detection unit and estimates the SOC of the power storage unit using a current integration method based on the current detected by the current detection unit. The control unit compares the SOC estimated using the OCV method with the SOC estimated using the current integration method to determine whether micro short circuit occurs in the power storage unit.

First claim

The invention claimed is:

1. A management apparatus comprising:
a voltage detection unit that detects voltage between both ends of a power storage unit;
a current detection unit that detects current flowing through the power storage unit; and
a control unit that estimates a state of charge (SOC) of the power storage unit using an open circuit voltage (OCV) method based on the voltage detected by the voltage detection unit, estimates the SOC of the power storage unit using a current integration method based on the current detected by the current detection unit, and compares the SOC estimated using the OCV method with the SOC estimated using the current integration method to determine whether micro short circuit occurs in the power storage unit,
wherein the control unit determines that the micro short circuit occurs in the power storage unit if a difference between the SOC estimated using the OCV method and the SOC estimated using the current integration method at a second time is increased from the difference at a first time, the second time being behind the first time by a predetermined time.

2. The management apparatus according to claim 1 ,
wherein the control unit performs the process of determining whether the micro short circuit occurs in the power storage unit during charge of the power storage unit.

3. A power storage system comprising:
a power storage unit; and
the management apparatus according to claim 1 .

4. A power storage system comprising:
a power storage unit; and
the management apparatus according to claim 2 .

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Tenmyo Hiroshi
• Yuasa Shinichi
• Sada Tomokazu

Classifications

• 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

• H01M10/482

  for several batteries or cells simultaneously or sequentially · CPC title

• G01R31/52

  Testing for short-circuits, leakage current or ground faults · CPC title

• H01M10/441

  for several batteries or cells simultaneously or sequentially · CPC title

• G01R31/392

  Determining battery ageing or deterioration, e.g. state of health · CPC title