VOLTAGE DETECTING DEVICE

• US 20170244259A1
• Filed: 01/26/2017
• Published: 08/24/2017
• Est. Priority Date: 02/19/2016
• Status: Abandoned Application

• Current Assignee: Keihin Corporation (Hitachi, Ltd.)
• Original Assignee: Keihin Corporation (Hitachi, Ltd.)
• Inventors: Tsuchiya, Shingo, Kamata, Seiji
• Application Number:
  US15/416,264
• Publication Number:
  US 20170244259A1
• Time in Patent Office: Days
• CPC Class Codes: B60L 53/22 Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
• 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
• CPC Class Codes: H02J 7/0016 using shunting, discharge or bypass circuits
• CPC Class Codes: H02J 7/0047 with monitoring or indicating devices or circuits
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A voltage detecting device includes a plurality of batteries, a plurality of filters each including a resistor and a capacitor, a plurality of discharge circuits each including a resistor, a switch, and a capacitor connected in parallel to the switch, a first voltage detecting circuit that includes a first filter among the plurality of filters and a first discharge circuit among the plurality of discharge circuits and detects voltage of a first battery among the plurality of batteries, a second voltage detecting circuit that includes a second filter among the plurality of filters and a second discharge circuit among the plurality of discharge circuits and detects voltage of a second battery among the plurality of batteries, and a detecting unit that controls the switch and detects disconnection between the battery and the discharge circuit based on outputs of the first and second voltage detecting circuits.

Claims

1. A voltage detecting device comprising:

a battery cell including a first battery and a second battery;

a discharge circuit, the discharge circuit including

a first discharge circuit including a first resistor, a first switch, and a first capacitor, and

a second discharge circuit including a second resistor, a second switch, and a second capacitor;

a first voltage detecting circuit that detects a voltage of the first battery, the first voltage detecting circuit including;

a first filter including a third resistor and a third capacitor, and

the first discharge circuit;

a second voltage detecting circuit that detects a voltage of the second battery, the second voltage detecting circuit including;

a second filter including a fourth resistor and a fourth capacitor, and

the second discharge circuit; and

a detecting unit that controls the first switch and the second switch and detects disconnection between the battery cell and the discharge circuit based on an output of the first voltage detecting circuit and an output of the second voltage detecting circuit.

2. The voltage detecting device according to claim 1, wherein

a resistance value possessed by the first filter is larger than a resistance value possessed by the first discharge circuit, and

a resistance value possessed by the second filter is larger than a resistance value possessed by the second discharge circuit.

3. The voltage detecting device according to claim 1, wherein

the detecting unit switches an on-state and an off-state of the first switch of the first discharge circuit for a predetermined period to discharge a charge stored in the third capacitor of the first filter, and switches an on-state and an off-state of the second switch of the second discharge circuit for the predetermined period to discharge a charge stored in the fourth capacitor of the second filter, and acquires the output of the first voltage detecting circuit and the output of the second voltage detecting circuit after the discharge.

4. The voltage detecting device according to claim 3, wherein

the detecting unit carries out operation of switching the on-state and the off-state of the first switch of the first discharge circuit and the second switch of the second discharge circuit for the predetermined period a predetermined number of times and acquires the outputs of the first voltage detecting circuit and the second voltage detecting circuit after discharge subsequent to the predetermined number of times of the operation, and

the detecting unit detects that disconnection has occurred between the second battery and the second discharge circuit when difference between the output of the first voltage detecting circuit and the output of the second voltage detecting circuit that are acquired is equal to or larger than a threshold.