Battery voltage adjusting device

• US 8,102,153 B2
• Filed: 07/30/2008
• Issued: 01/24/2012
• Est. Priority Date: 10/03/2007
• Status: Active Grant

• Current Assignee: Yazaki Corporation
• Original Assignee: Yazaki Corporation
• Inventors: Ishikawa, Satoshi, Saigo, Tsutomu
• Primary Examiner(s): WILLIAMS, ARUN C
• Application Number:
  US12/219,895
• Publication Number:
  US 20090091297A1
• Time in Patent Office: 1,273 Days
• Field of Search: 320/104, 320/134, 340/636.18
• US Class Current: 320/134
• CPC Class Codes: H01M 10/443 in response to temperature
• CPC Class Codes: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: H02J 7/0047 with monitoring or indicating devices or circuits
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y10S 903/903 having energy storing means, e.g. battery, capacitor

Abstract

The battery voltage adjusting device includes: a voltage detecting means provided corresponding to a block including at least one unit cell of an on-vehicle high voltage battery consisting of a plurality of the unit cells connected in series and detecting a terminal voltage of the unit cell in the block; a charge-discharge means charging or discharging the unit cell in the block on the basis of the terminal voltage of the unit cell detected by the voltage detecting means; a temperature detecting means detecting a temperature of the unit cell; and a changing means changing a time period, from a time point when the charge-discharge means finishes to charge or discharge the unit cell to a time point when the voltage detecting means detects the terminal voltage of the unit cell, on the basis of the temperature of the unit cell detected by the temperature detecting means.

Claims

1. A battery voltage adjusting device comprising:

a voltage detecting means, which is provided corresponding to a block including at least one unit cell of an on-vehicle high voltage battery consisting of a plurality of the unit cells connected in series and detects a terminal voltage of the unit cell in the block;

a charge-discharge means, which charges or discharges the unit cell in the block on the basis of the terminal voltage of the unit cell detected by the voltage detecting means;

a temperature detecting means, which detects a temperature of the unit cell; and

a changing means, which changes a length of a time period to be elapsed between a first point in time, when the charge-discharge means finishes to charge or discharge the unit cell, and a second point in time, when the voltage detecting means detects the terminal voltage of the unit cell, based on the temperature of the unit cell detected by the temperature detecting means.

2. The device according to claim 1, wherein the changing means changes the length of the time period to be elapsed between the first point in time, when the charge-discharge means finishes to charge or discharge the unit cell, and the second point in time, when the voltage detecting means detects a terminal voltage of the unit cell, based on the temperature of the unit cell detected by the temperature detecting means and a capacity of a charge or discharge performed by the charge-discharge means.

3. The device according to claim 1, wherein the changing means changes the length of the time period to be elapsed between the first point in time, when an ignition switch of a vehicle is turned off, and the second point in time, when the voltage detecting means detects a terminal voltage of the unit cell, based on the temperature of the unit cell detected by the temperature detecting means.

4. The device according to claim 2, wherein the changing means changes the length of the time period to be elapsed between the first point in time, when an ignition switch of a vehicle is turned off and the second point in time, when the voltage detecting means detects a terminal voltage of the unit cell, based on the temperature of the unit cell detected by the temperature detecting means.