# US 2023/0266397 A1 · Battery system

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- Number: US 2023/0266397 A1
- Document ID: US20230266397A1
- Status: Published application
- Kind: A1
- Application number: 18/310,570
- Filed: 2023-05-02
- Published: 2023-08-24
- Earliest claimed: 2020-06-12
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Masatsugu KAWAKAMI
- Web page: https://patentgrep.com/patent/US20230266397A1

## CPC

- G01R 31/3842: combining voltage and current measurements
- G01R 31/3828: using current integration
- H01M 10/4207: {for several batteries or cells simultaneously or sequentially}
- H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)}
- H01M 10/482: {for several batteries or cells simultaneously or sequentially}
- H01M 10/441: {for several batteries or cells simultaneously or sequentially}
- Y02E 60/10: Energy storage using batteries
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## 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.

## Claims

### Claim 1

A method for determining an occurrence of an over charge for a battery module, wherein the battery module includes 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, and the battery pack A and the battery pack B are connected in parallel,
the method comprising:
measuring a total current IA of the battery pack A,
measuring a total current IB of the battery pack B,
calculating a determining value based on the total current IA and the total current IB, and
determining the occurrence of the over charge based on the determining value,
wherein a slope of a current ratio of the total current IA and the total current IB is calculated as the determining value, and
the occurrence of the over charge is determined from a condition, wherein the slope of the current ratio is a threshold or more, is maintained for a predetermined time.