Battery system

Patent metadata

Field	Value
Publication number	US-12399224-B2
Application number	US-202418443436-A
Country	US
Kind code	B2
Filing date	Feb 16, 2024
Priority date	Jun 12, 2020
Publication date	Aug 26, 2025
Grant date	Aug 26, 2025

Abstract

A battery system capable of avoiding an over charge with a simple sensor element is provided. The battery system comprises 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. The monitoring unit includes: a first current sensor to measure a total current I A of the battery pack A, and a second current sensor to measure a total current I B of the battery pack B. The control unit calculates a determining value based on the total current I A and the total current I B , and determines 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 comprising a processor and a memory storing non-transitory computer readable instructions, which instructions are executed by the processor 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 Is 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 that 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 Is 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