Apparatus and method for discharging battery

Patent metadata

Field	Value
Publication number	US-2016159243-A1
Application number	US-201514962222-A
Country	US
Kind code	A1
Filing date	Dec 8, 2015
Priority date	Dec 8, 2014
Publication date	Jun 9, 2016
Grant date	—

Abstract

The present invention relates to a battery discharging apparatus and a method thereof of a battery management system and an exemplary embodiment of the present invention provides a battery discharging apparatus, including: a battery module including a plurality of battery cells; a discharging element which is connected to the battery cells through switches to discharge a voltage of the battery cells; a detecting unit which detects an abnormal state of a vehicle; and a control unit which is connected to the battery module to monitor a charged/discharged status of the battery cells of the battery module and controls the switches to balance the battery cells, in which when the control unit receives a vehicle abnormal state signal from the detecting unit, the control unit controls the switches to be turned on/off at a predetermined duty ratio to discharge the battery cell.

First claim

What is claimed is:

1 . A battery discharging apparatus, comprising:
a battery module including a plurality of battery cells; a discharging element which is connected to the battery cells through switches to discharge a voltage of the battery cells; a detecting unit which detects an abnormal state of a vehicle; and a control unit which is connected to the battery module to monitor a charged/discharged status of the battery cells of the battery module and controls the switches to balance the battery cells, wherein when the control unit receives a vehicle abnormal state signal from the detecting unit, the control unit controls the switches to be turned on/off at a predetermined duty ratio to discharge the battery cells.

2 . The battery discharging apparatus of claim 1 , wherein the control unit controls the switch at a duty ratio in which an on:off ratio is 3:7.

3 . The battery discharging apparatus of claim 1 , wherein a plurality of battery modules is provided and the control unit independently controls the battery modules at the predetermined duty ratio to discharge the battery cells.

4 . The battery discharging apparatus of claim 1 , wherein a plurality of battery modules is provided and the control unit simultaneously controls adjacent battery modules at the predetermined duty ratio to discharge the battery cells.

5 . The battery discharging apparatus of claim 1 , wherein a plurality of battery modules is provided and the control unit simultaneously controls the entire battery modules at the predetermined duty ratio to simultaneously discharge the battery cells.

6 . The battery discharging apparatus of claim 1 , wherein the control unit subsequently performs cell sensing, cell diagnosing, and cell balancing control including turning on/off the switch during a predetermined interval, and the on and off interval of the switch has a duty ratio of 3:7.

7 . A battery cell discharging method of a vehicle battery management system including battery modules configured by a plurality of battery cells, the method comprising:
detecting, by a sensor, a car crash or damage to generate a vehicle abnormal state signal; receiving, by a control unit, the vehicle abnormal state signal; and discharging a battery cell by controlling a switch to be turned on/off at a predetermined duty ratio to discharge the battery cell.

8 . The battery discharging method of claim 7 , wherein an on:off ratio of the duty ratio of the switch is 3:7.

9 . The battery discharging method of claim 7 , wherein the discharging of a battery cell includes subsequently performing cell sensing, cell diagnosing, and cell balancing control including turning on/off the switch during a predetermined interval, and the on and off interval of the switch has a duty ratio of 3:7.

10 . The battery discharging method of claim 7 , wherein in the discharging of a battery cell, the battery modules are independently controlled to be on/off at the predetermined duty ratio to discharge the battery cell.

11 . The battery discharging method of claim 7 , wherein in the discharging of a battery cell, a group of adjacent battery modules is controlled to be on/off at the predetermined duty ratio to discharge the battery cell.

12 . The battery discharging method of claim 7 , wherein in the discharging of a to battery cell, the entire battery modules are simultaneously controlled to be on/off at the predetermined duty ratio to discharge the battery cell.

Assignees

• Hyundai Autron Co Ltd

Inventors

• Park Jae-Seong

Classifications

• B60L2240/80

  Time limits · CPC title

• H01M10/4207 Primary

  for several batteries or cells simultaneously or sequentially · CPC title

• H01M2010/4271

  Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing · CPC title

• B60L58/21

  having the same nominal voltage · CPC title

• B60W20/00

  Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)} · CPC title