Battery system

Patent metadata

Field	Value
Publication number	US-11680988-B2
Application number	US-202117326594-A
Country	US
Kind code	B2
Filing date	May 21, 2021
Priority date	Jun 12, 2020
Publication date	Jun 20, 2023
Grant date	Jun 20, 2023

Abstract

A battery system capable of avoiding an over charge with a simple sensor element 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 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. The control unit calculates a determining value based on the total current IA 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 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, and
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.

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.

4. 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 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 control unit 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.

5. The battery system according to claim 4 , wherein 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.

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

• H01M10/482 Primary

  for several batteries or cells simultaneously or sequentially · CPC title

• H01M10/4207

  for several batteries or cells simultaneously or sequentially · CPC title

• G01R31/3842 Primary

  combining voltage and current measurements · CPC title