Battery system

Patent metadata

Field	Value
Publication number	US-2021389382-A1
Application number	US-202117326594-A
Country	US
Kind code	A1
Filing date	May 21, 2021
Priority date	Jun 12, 2020
Publication date	Dec 16, 2021
Grant date	—

Abstract

A main object of the present disclosure is to provide a battery system capable of avoiding an over charge with a simple sensor element. The present disclosure achieves the object by providing a battery system comprising: a battery module including a battery pack A including a plurality of battery cells connected in series, and a battery pack B including a plurality of battery cells connected in series, connected in parallel, a monitoring unit configured to monitor a condition of the battery module, and a control unit configured to control at least a charge of the battery module, and the monitoring unit includes: a first current sensor configured to measure a total current IA of the battery pack A, and a second current sensor configured to measure a total current IB of the battery pack B, and the control unit includes: a calculating section configured to calculate a determining value based on the total current IA and the total current IB, and a determining section configured to determine an occurrence of an over charge based on the determining value.

First claim

What is claimed is:

1 . A battery system comprising:
a battery module including a battery pack A including a plurality of battery cells connected in series, and a battery pack B including a plurality of battery cells connected in series, connected in parallel, a monitoring unit configured to monitor a condition of the battery module, and a control unit configured to control at least a charge of the battery module, and the monitoring unit includes: a first current sensor configured to measure a total current I A of the battery pack A, and a second current sensor configured to measure a total current I B of the battery pack B, and the control unit includes: a calculating section configured to calculate a determining value based on the total current I A and the total current I B , and a determining section configured to determine an occurrence of an over charge based on the determining value.

2 . The battery system according to claim 1 , wherein the calculating section calculates a current ratio of the total current I A and the total current I B as the determining value, and
the determining section determines the occurrence of the over charge from a condition, wherein the value of the current ratio is a threshold or more, is maintained for a predetermined time.

3 . The battery system according to claim 1 , wherein the calculating section calculates a slope of a current ratio of the total current I A and the total current I B as the determining value, and
the determining section determines the occurrence of the over charge from a condition, wherein the slope of the current ratio is a threshold or more, is maintained for a predetermined time.

4 . The battery system according to claim 2 , wherein the predetermined time is 1 second or more.

5 . The battery system according to claim 1 , wherein the calculating section calculates an absolute value of a difference between an integrated value S A of the total current I A and an integrated value S B of the total current I B as the determining value, and
the determining section determines the occurrence of the over charge from the absolute value being a threshold or more, and a constant increase of both of the integrated value S A and the integrated value S B during a period of a base point to the threshold.

6 . The battery system according to claim 1 , wherein the battery cell in the battery pack A and the battery cell in the battery pack B is respectively provided with a power generation unit including a cathode layer, an anode layer, and an electrolyte layer formed between the cathode layer and the anode layer, and
the electrolyte layer includes an inorganic solid electrolyte.

7 . The battery system according to claim 1 , wherein the monitoring unit includes no voltage sensor configured to measure a voltage of the battery cell in the battery pack A individually, and includes no voltage sensor configured to measure a voltage of the battery cell in the battery pack B individually.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kawakami Masatsugu

Classifications

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/61

  against overcharge · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/441

  for several batteries or cells simultaneously or sequentially · CPC title

• H01M10/425 Primary

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title