BATTERY MONITORING SYSTEM

• US 20170003327A1
• Filed: 06/28/2016
• Published: 01/05/2017
• Est. Priority Date: 07/03/2015
• Status: Active Grant

• Current Assignee: Ablic Inc. (MinebeaMitsumi Inc.)
• Original Assignee: SII Semiconductor Corporation
• Inventors: MUKAINAKANO, Hiroshi, SANO, Kazuaki, KOIKE, Toshiyuki, SAKURAI, Atsushi
• Granted Patent: US 10,444,263 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01R 19/16542 for batteries charge condition monitoring in G01R31/36
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• CPC Class Codes: G01R 31/3835 involving only voltage measurements

Abstract

Provided is a battery monitoring system that has a high level of safety even under a state in which characteristics of a reference voltage circuit are deteriorated. The battery monitoring system has a configuration in which: a reference voltage of a first battery monitoring IC is monitored by a second battery monitoring IC; and the second battery monitoring IC outputs, when detecting that the reference voltage reaches a value falling outside a predetermined range, a signal indicating an abnormality of the reference voltage to the first battery monitoring IC, and the first battery monitoring IC stops monitoring of a battery when the signal indicating the abnormality of the reference voltage is input to the first battery monitoring IC.

Claims

1. A battery monitoring system, comprising:

a battery;

a first battery monitoring IC; and

a second battery monitoring IC,

the second battery monitoring IC being configured to;

monitor a reference voltage of the first battery monitoring IC; and

output, when the second battery monitoring IC detects that the reference voltage reaches a value falling outside a predetermined range, a signal indicating an abnormality of the reference voltage to the first battery monitoring IC,

the first battery monitoring IC being configured to stop monitoring of the battery when the first battery monitoring IC inputs the signal indicating the abnormality of the reference voltage from the second battery monitoring IC.

2. A battery monitoring system according to claim 1,

wherein the first battery monitoring IC includes a reference voltage output terminal for outputting the reference voltage, and an input terminal for inputting the signal indicating the abnormality of the reference voltage, and

wherein the second battery monitoring IC includes an external reference voltage input terminal for inputting the reference voltage, an external reference voltage monitoring circuit configured to detect the abnormality of the reference voltage, and an output terminal for outputting the signal indicating the abnormality of the reference voltage.

3. A battery monitoring system according to claim 1,

wherein the first battery monitoring IC is configured to:

monitor a reference voltage of the second battery monitoring IC; and

output, when the first battery monitoring IC detects that the reference voltage reaches a value falling outside a predetermined range, a signal indicating an abnormality of the reference voltage to the second battery monitoring IC, and

wherein the second battery monitoring IC is configured to stop monitoring of the battery when the second battery monitoring IC inputs the signal indicating the abnormality of the reference voltage from the first battery monitoring IC.

4. A battery monitoring system according to claim 3,

wherein the first battery monitoring IC includes:

a reference voltage output terminal for outputting the reference voltage;

an input terminal for inputting a signal indicating the abnormality of the reference voltage of the first battery monitoring IC;

an external reference voltage input terminal for inputting the reference voltage of the second battery monitoring IC;

an external reference voltage monitoring circuit configured to detect the abnormality of the reference voltage of the second battery monitoring IC; and

an output terminal for outputting a signal indicating the abnormality of the reference voltage of the second battery monitoring IC, and

wherein the second battery monitoring IC includes;

a reference voltage output terminal for outputting the reference voltage;

an input terminal for inputting a signal indicating the abnormality of the reference voltage of the second battery monitoring IC;

an external reference voltage input terminal for inputting the reference voltage of the first battery monitoring IC;

an external reference voltage monitoring circuit configured to detect the abnormality of the reference voltage of the first battery monitoring IC; and

an output terminal for outputting a signal indicating the abnormality of the reference voltage of the first battery monitoring IC.