Battery voltage detection device

• US 10,006,966 B2
• Filed: 03/01/2016
• Issued: 06/26/2018
• 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
• Primary Examiner(s): Diao, M'Baye
• Application Number:
  US15/057,655
• Publication Number:
  US 20160291091A1
• Time in Patent Office: 847 Days
• Field of Search: 324434
• 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;

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 the voltage source via a reference voltage source outputting a voltage obtained by adding a predetermined voltage to a terminal voltage of the unit battery corresponding thereto.

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

wherein some of the other ends of the capacitors are connected to the voltage source via the reference voltage source and the others of the other ends of the capacitors are grounded.