Battery system

Patent metadata

Field	Value
Publication number	US-2024248143-A1
Application number	US-202418443436-A
Country	US
Kind code	A1
Filing date	Feb 16, 2024
Priority date	Jun 12, 2020
Publication date	Jul 25, 2024
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 is: configured to calculate a determining value based on the total current I A and the total current I B , and configured to determine an occurrence of an over charge based on the determining value; wherein the control unit calculates a slope of a current ratio of the total current I A and the total current I B as the determining value, the control unit 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, and a battery cell in the battery pack A and a battery cell in the battery pack B respectively include 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.

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

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

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

• H01M10/4207

  for several batteries or cells simultaneously or sequentially · CPC title

• H01M10/482 Primary

  for several batteries or cells simultaneously or sequentially · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title