BATTERY VOLTAGE DETECTION DEVICE

• US 20160291091A1
• Filed: 03/01/2016
• Published: 10/06/2016
• Est. Priority Date: 03/31/2015
• Status: Active Grant

• Current Assignee: Hitachi Astemo Ltd. (Hitachi, Ltd.)
• Original Assignee: Keihin Corporation (Hitachi, Ltd.)
• Inventors: TSUCHIYA, Shingo, KAMATA, Seiji
• Granted Patent: US 10,006,966 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01R 31/374 with means for correcting the measurement for temperature or ageing
• CPC Class Codes: G01R 31/3835 involving only voltage measurements
• CPC Class Codes: G01R 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

Abstract

A battery voltage detection device includes a battery; a voltage detection circuit; and a low-pass filter provided between the battery and the voltage detection circuit. The low-pass filter includes a capacitor of which one end is connected to a terminal of the battery and the other end is connected to a voltage source outputting a voltage higher than a terminal voltage of the battery.

Claims

1. A battery voltage detection device comprising:

a battery;

a voltage detection circuit; and

a low-pass filter provided between the battery and the voltage detection circuit,

wherein the low-pass filter includes a capacitor of which one end is connected to a terminal of the battery and the other end is connected to a voltage source outputting a voltage higher than a terminal voltage of the battery.

2. The battery voltage detection device according to claim 1,

wherein the battery is a battery pack in which a plurality of unit batteries are connected in series with each other,

wherein the low-pass filter is provided for each of the unit batteries, and

wherein all or some of the other ends of the capacitors are connected to a voltage source outputting a voltage higher than a terminal voltage of the unit battery.

3. The battery voltage detection device according to claim 1,

wherein the battery is a battery pack in which a plurality of unit batteries are connected in series with each other,

wherein the low-pass filter is provided for each of the unit batteries, and

wherein each of the other ends of the capacitors is connected to a voltage source outputting a voltage obtained by adding a predetermined voltage to a terminal voltage of the unit battery corresponding thereto.